14-Bit, 10MHz
CCD/CIS SIGNAL PROCESSOR
®
VSP3100
DESCRIPTION
The VSP3100 is a complete CCD/CIS image proces-
sor which operates from a single +5V supply.
This complete image processor includes three Corre-
lated Double Samplers (CDS) and Programmable Gain
Amplifiers (PGA) to process CCD signals.
These three channel inputs also allow Contact Image
Sensor (CIS) inputs.
The VSP3100 is an interface compatible with the
VSP3000 which is 12-bit one-chip product.
The VSP3100 can be operated from 0°C to +85°C and
is available in an LQFP-48 package.
FEATURES
INTEGRATED TRIPLE-CORRELATED
DOUBLE SAMPLER
OPERATION MODE SELECTABLE:
1-Channel, 3-Channel, 10MSPS (typ),
CCD/CIS Mode
PROGRAMMABLE GAIN AMPLIFIER:
0dB to +13dB
SELECTABLE OUTPUT MODES:
Normal/Demultiplexed
OFFSET CONTROL RANGE: ±400mV
+3V, +5V Digital Output
LOW POWER: 450mW (typ)
LQFP-48 SURFACE-MOUNT PACKAGE
© 2000 Burr-Brown Corporation PDS-1583A Printed in U.S.A. April, 2000
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
For most current data sheet and other product
information, visit www.burr-brown.com
10 5
RINP
INN
Clamp
10 5
GINP
Clamp
10
5
58
3
10
14
CDS
CDS
CDS
PGA
PGA
PGA
BINP
Clamp
10-Bit
DAC
10-Bit
DAC
10-Bit
DAC
MUX
Timing Generator
Reference
Circuit
Digital
Output
Control
R
G
B
Offset
Register
R
G
B
Gain
Control
Register
Configuration
Register
Register
Port
14-Bit
A/D
P/S
WRT
RD
SCLK
SD
CM
REFP
REFN
VDRV
B0-B13
(A0-A2, D0-D9)
OE
VSP3100
CK1CLP CK2
ADCCK
VREF
TP0
VSP3100
SBMS007
2
®
VSP3100
SPECIFICATIONS
At TA = full specified temperature range, VCC = +5V, fADCCK = 6MHz, fCK1 = 2MHz, fCK2 = 2MHz, PGA gain = 1, normal output mode, no output load, unless otherwise
specified.
VSP3100Y
PARAMETER CONDITIONS MIN TYP MAX UNITS
RESOLUTION 14 Bits
CONVERSION CHARACTERISTICS
1-, 3-Channel CDS Mode 10 MSPS
1-, 3-Channel CIS Mode 10 MSPS
DIGITAL INPUTS
Logic Family CMOS
Convert Command Start Conversion Rising Edge of ADCCK Clock
High Level Input Current (VIN = VCC)20 µA
Low Level Input Current (VIN = 0V) 20 µA
Positive-Going Threshold Voltage Pins 18, 19, 20, 21, 22, 24 3.80 V
Negative-Going Threshold Voltage Pins 18, 19, 20, 21, 22, 24 1.25 V
Positive-Going Threshold Voltage Pins 12, 14, 15, 16 2.20 V
Negative-Going Threshold Voltage Pins 12, 14, 15, 16 0.80 V
Input Capacitance 5pF
ANALOG INPUTS
Full-Scale Input Range 0.5 3.5 Vp-p
Input Capacitance 10 pF
Input Limits AGND – 0.3 VCC + 0.3 V
External Reference Voltage Range 0.25 0.3 V
Reference Input Resistance 800
DYNAMIC CHARACTERISTICS
Integral Non-Linearity (INL) ±4.0 LSB
Differential Non-Linearity (DNL) 0.5 LSB
No Missing Codes Guaranteed Bits
Output Noise Gain = 0dB, Input Grounded 0.5 LSBs rms
PSRR 0.04 % FSR
DC ACCURACY
Zero Error Gain = 0dB 0.8 % FS
Gain Error Gain = 0dB 1.5 % FS
DIGITAL OUTPUTS
Logic Family TTL/HCT
Logic Coding Straight Offset Binary
Digital Data Output Rate, Max Normal Mode 10 MHz
Demultiplexed Mode 10 MHz
VDRV Supply Range +2.7 +5.3 V
Output Voltage, VDRV = +5V
Low Level IOL = 50µA +0.1 V
High Level IOH = 50µA +4.6 V
Low Level IOL = 1.6mA +0.4 V
High Level IOH = 0.5mA +2.4 V
Output Voltage, VDRV = +3
Low Level IOL = 50µA +0.1 V
High Level IOH = 50µA +2.5 V
Ouput Enable Time Output Enable = LOW 20 40 ns
3-State Enable Time Output Enable = HIGH 2 10 ns
Output Capacitance 5pF
Data Latency 7 Clock Cycles
Data Output Delay CL = 15pF 12 ns
POWER SUPPLY REQUIREMENTS
Supply Voltage: VCC 4.7 5 5.3 V
Supply Current: ICC (No Load) 3-Ch Mode 90 mA
1-Ch Mode 75 mA
Power Dissipation (No Load) 3-Ch Mode 450 mW
1-Ch Mode 375 mW
Thermal Resistance,
θ
JA 100 °C/W
SPECIFIED TEMPERATURE RANGE 0 to +85 °C
NOTE: (1) SNR = 20log (full-scale voltage/rms noise).
3
®
VSP3100
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
Supply Voltage(2) .............................................................................................................. +6.5V
Supply Voltage Differences(3) ................................................................................... ±0.1V
GND Voltage Differences(4) ........................................................................................ ±0.1V
Digital Input Voltage................................................. –0.3V to (VCC + 0.3V)
Analog Input Voltage................................................ –0.3V to (VCC + 0.3V)
Input Current (any pins except suppplies) ...................................... ±10mA
Operating Temperature ........................................................ 0°C to +85°C
Storage Temperature...................................................... –55°C to +150°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering) ....................................................... +150°C
Package Temperature (IR Reflow, peak, 10s)............................... +260°C
Package Temperature (IR Reflow, peak, 5s) ................................. +235°C
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
(2) VCC, VDRV. (3) Among VCC. (4) Among AGND.
ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PRODUCT PACKAGE
VSP3100Y DEM-VSP3100Y
DEMO BOARD ORDERING INFORMATION
PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT
PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER(1) MEDIA
VSP3100Y LQFP-48 340 0°C to +85°C VSP3100Y VSP3100Y 250-Piece Tray
""""VSP3100Y VSP3100Y/2K Tape and Reel
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K indicates 2000 devices per reel). Ordering 2000 pieces of
“VSP3100Y/2K” will get a single 2000-piece Tape and Reel.
PACKAGE/ORDERING INFORMATION
4
®
VSP3100
Top View LQFP
PIN DESCRIPTIONS
PIN DESIGNATOR TYPE DESCRIPTION PIN DESIGNATOR TYPE DESCRIPTION
1 CM AO Common-Mode Voltage
2 REFP AO Top Reference
3 AGND P Analog Ground
4 INN AI Red/Green/Blue Channel Reference Input
5 RINP AI Red Channel Analog Input
6 AGND P Analog Ground
7 GINP AI Green Channel Analog Input
8 AGND P Analog Ground
9 BINP AI Blue Channel Analog Input
10 AGND P Analog Ground
11 VCC P Analog Power Supply, +5V
12 CLP DI Clamp Enable:
“High” = Enable, “Low” = Disable
13 VCC P Analog Power Supply, +5V
14 ADCCK DI Clock for A/D Converter Digital Data Output
15 CK1 DI Sample Reference Clock
16 CK2 DI Sample Data Clock
17 AGND P Analog Ground
18 RD DI Read Signal for Registers
19 WRT DI Write Signal for Registers
20 P/S DI Parallel/Serial Port Select
“High” = Parallel Port, “Low” = Serial Port
21 SD DI Serial Data Input
22 SCLK DI Serial Data Shift Clock
23 VCC P Analog Power Supply, +5V
24 OE DI Output Enable
PIN CONFIGURATION
25 B0 (D0) LSB DIO A/D Output (Bit 0) and Register Data (Bit 0)
26 B1 (D1) DIO A/D Output (Bit 1) and Register Data (Bit 1)
27 B2 (D2) DIO A/D Output (Bit 2) and Register Data (Bit 2)
28 B3 (D3) DIO A/D Output (Bit 3) and Register Data (Bit 3)
29 B4 (D4) DIO A/D Output (Bit 4) and Register Data (Bit 4)
30 B5 (D5) DIO A/D Output (Bit 5) and Register Data (Bit 5)
31 B6 (D6) DIO A/D Output (Bit 6) and Register Data (Bit 6)
32 B7 (D7) DIO A/D Output (Bit 7) and Register Data (Bit 7)
33 B8 (D8) DIO A/D Output (Bit 8) and Register Data (Bit 8)
B0: Demiltiplexed Mode A/D Output (Bit 0) when Demultiplexed Output Mode
34 B9 (D9) DIO A/D Output (Bit 9) and Register Data (Bit 9)
B1: Demiltiplexed Mode A/D Output (Bit 1) when Demultiplexed Output Mode
35 B10 (A0) DIO A/D Output (Bit 10) and Register Address (Bit 0)
B2: Demiltiplexed Mode A/D Output (Bit 2) when Demultiplexed Output Mode
36 B11 (A1) DIO A/D Output (Bit 11) and Register Address (Bit 1)
B3: Demiltiplexed Mode A/D Output (Bit 3) when Demultiplexed Output Mode
37 B12 (A2) DIO A/D Output (Bit 12) and Register Address (Bit 2)
B4: Demiltiplexed Mode A/D Output (Bit 4) when Demultiplexed Output Mode
38 B13 MSB DO A/D Output (Bit 13)
B5: Demiltiplexed Mode A/D Output (Bit 5) when Demultiplexed Output Mode
39 AGND P Analog Ground
40 AGND P Analog Ground
41 VDRV P Digital Output Driver Power Supply
42 VCC P Analog Power Supply, +5V
43 VCC P Analog Power Supply, +5V
44 AGND P Analog Ground
45 TP0 AO A/D Converter Input Monitor Pin (single-ended output)
46 VREF AIO Reference Voltage Input/Output
47 VCC P Analog Power Supply, +5V
48 REFN AO Bottom Reference
36
35
34
33
32
31
30
29
28
27
26
25
B11 (A1)
B10 (A0)
B9 (D9)
B8 (D8)
B7 (D7)
B6 (D6)
B5 (D5)
B4 (D4)
B3 (D3)
B2 (D2)
B1 (D1)
B0 (D0) LSB
REFN
VCC
VREF
TP0
AGND
VCC
VCC
VDRV
AGND
AGND
B13 MSB
B12 (A2)
VCC
ADCCK
CK1
CK2
AGND
RD
WRT
P/S
SD
SCLK
VCC
OE
1
2
3
4
5
6
7
8
9
10
11
12
CM
REFP
AGND
INN
RINP
AGND
GINP
AGND
BINP
AGND
VCC
CLP
48 47 46 45 44 43 42 41 40 39 38
13 14 15 16 17 18 19 20 21 22 23
37
24
VSP3100Y
5
®
VSP3100
TIMING DIAGRAMS
Timing Specifications: VCC = +5V supply and normal output mode with the specified temperature range, unless otherwise noted.
SYMBOL PARAMETER MIN TYP MAX UNITS
tCK1W-1 CK1 Pulse Width 20 40 ns
tCK1P-1 1-Channel Mode Conversion Rate 100 166 ns
tCK2W-1 CK2 Pulse Width 20 40 ns
tCK1CK2-1 CK1 Falling to CK2 Rising 15 ns
tCK2CK1-1 CK2 Falling to CK1 Rising 40 ns
tCK1ADC CK1 Rising to ADCCK Falling 20 ns
tADCCK2-1 ADCCK Falling to CK2 Falling 15 ns
tADCW ADCCK Pulse Width 41 83 ns
tADCP ADCCK Period 83 166 ns
tSSampling Delay 10 ns
tSET ADCCK Rising to CK1 Rising 10 ns
tCNV Conversion Delay 40 ns
1-Channel CCD Mode Timing
CCD Output
CK1
CK2
ADCCK
t
S
t
S
t
CK1P-1
t
SET
t
CK1ADC
t
ADCCK2-1
t
CK1CK2-1
t
CK2CK1-1
t
CK2W-1
t
CNV
t
ADCW
t
ADCP
t
ADCW
t
CK1W-1
Pixel 1
Pixel 1
Pixel 2
SYMBOL PARAMETER MIN TYP MAX UNITS
tCK1W-1 CK1 Pulse Width 20 40 ns
tCK1P-1 1-Channel Mode Conversion Rate 100 166 ns
tADCW ADCCK Pulse Width 41 83 ns
tADCP ADCCK Period 83 166 ns
tSSampling Delay 10 ns
tSET ADCCK Falling to CK1 Rising 10 ns
tCNV Conversion Delay 40 ns
1-Channel CIS Mode Timing
CIS Output
CK1
ADCCK
t
S
t
CK1P-1
t
SET
t
CNV
t
ADCW
t
ADCW
t
ADCP
t
CK1W-1
t
SET
Pixel 1
Pixel 1 Pixel 2
Pixel 2
6
®
VSP3100
TIMING DIAGRAMS (Cont.)
Timing Specifications: VCC = +5V supply and normal output mode with the specified temperature range, unless otherwise noted.
SYMBOL PARAMETER MIN TYP MAX UNITS
tCK1W-3 CK1 Pulse Width 20 125 ns
tCK1P-3 3-Channel Mode Conversion Rate 300 500 ns
tCK2W-3 CK2 Pulse Width 20 125 ns
tCK1CK2-3 CK1 Falling to CK2 Rising 15 ns
tCK2CK1-3 CK2 Falling to CK1 Rising 70 ns
tADCCK2-3 ADCCK Falling to CK2 Falling 5 ns
tADCW ADCCK Pulse Width 41 83 ns
tADCP ADCCK Period 83 166 ns
tSSampling Delay 10 ns
tSET ADCCK Rising to CK1 Rising 10 ns
tCNV Conversion Delay 40 ns
3-Channel CCD Mode Timing
t
ADCP
t
ADCW
t
SET
t
SET
t
CK1CK2-3
t
CK2CK1-3
t
CNV
t
S
t
S
t
CK2W-3
t
ADCW
t
ADCCK2-3
t
CK1W-3
t
CK1P-3
(R) (G) (B) Pixel 1 (R)
Pixel 1 (R/G/B) Pixel 2 (R/G/B)
Pixel 1 (G) Pixel 1 (B)
CCD Output
CK1
CK2
ADCCK
7
®
VSP3100
TIMING DIAGRAMS (Cont.)
Timing Specifications: VCC = +5V supply and normal output mode with the specified temperature range, unless otherwise noted.
SYMBOL PARAMETER MIN TYP MAX UNITS
tCK1W-3 CK1 Pulse Width 20 125 ns
tCK1P-3 3-Channel Mode Conversion Rate 300 500 ns
tADCCK1 ADCCK Falling to CK1 Falling 5 ns
tADCW ADCCK Pulse Width 41 83 ns
tADCP ADCCK Period 83 166 ns
tSSampling Delay 10 ns
tSET ADCCK Falling to CK1 Rising 10 ns
tCNV Conversion Delay 40 ns
3-Channel CIS Mode Timing
CIS Output
CK1
ADCCK
t
S
t
CK1P-3
t
SET
t
ADCW
t
ADCW
t
ADCP
t
CK1W-3
t
ADCCK1
t
CNV
t
SET
Pixel 1 (R/G/B) Pixel 2 (R/G/B)
(R) (G) (B) Pixel 1
(R) Pixel 1
(G) Pixel 1
(B)
Timing for Parallel Port Writing
SYMBOL
PARAMETER MIN TYP MAX UNITS
tPR Parallel Ready Time 20 ns
tWWRT Pulse Width 30 50 ns
tWD Data Valid Time 30 ns
tRW Address Setup Time 20 50 ns
tDA Data Setup Time 30 50 ns
Timing for Reading
SYMBOL
PARAMETER MIN TYP MAX UNITS
tPR Parallel Ready Time 20 ns
tDA Data Setup Time 30 50 ns
tRW Address Setup Time 20 50 ns
tRD Readout Delay 20 ns
tRH Data Hold Time 1 ns
Valid
Stable
Stable
D9-D0
A2-A0
P/S
WRT
Register
t
RW
t
PR
t
DA
t
W
t
WD
Valid
t
RD
t
RH
RD
D7-D0
Stable
Valid
A2-A0
Register
P/S
t
DA
t
PR
t
RW
8
®
VSP3100
TIMING DIAGRAMS (Cont.)
Timing Specifications: VCC = +5V supply and normal output mode with the specified temperature range,
unless otherwise noted.
Timing for Serial Port Writing
SYMBOL PARAMETER MIN TYP MAX UNITS
tWWRT Pulse Width 30 50 ns
tWD Data Valid Time 30 ns
tSD Data Ready Time 15 50 ns
tSCK Serial Clock Pulse Width 30 50 ns
tSCKP Serial Clock Period 60 100 ns
tSS Serial Ready Time 100 200 ns
tSW WRT Pulse Setup Time 50 ns
P/S
SCLK
A2-A0 A2 A1
Valid
A0 D9 D1 D0
WRT
Register
t
SS
t
SCK
t
SCK
t
SCKP
t
SW
t
W
t
WD
t
SD
• • •
• • •
Timing for A/D Output (Normal Operation Mode)
SYMBOL
PARAMETER MIN TYP MAX UNITS
tOES
A/D Output Enable Setup Time
20 ns
tOER Output Enable Time 20 40 ns
t3E 3-State Enable Time 2 10 ns
tOEW OE Pulse Width 100 ns
tDOD Data Output Delay 12 ns
tOEP Parallel Port Setup Time 10 ns
Timing for A/D Output (
Demultiplexed Operation Mode
)
Data n+1
(Hi-Z)(Hi-Z)
Data n+2
(n+2) (n+1) (n)
Data n (14-Bit)
ADCCK
DOUT
OE
P/S
tDOD tDOD tDOD
tOES tOEP
t3E
tOEW
tOER
NOTE: It is Inhibit Operation Mode that OE sets “Low” during P/S = “High” period.
n (B0-B5)
(Hi-Z)
(Hi-Z)
NOTE: It is Inhibit Operation Mode that OE sets “Low” during P/S = “High” period.
n+1 (B6-B13)
(n+1)
(n)
(n)
n (B6-B13)
ADCCK
DOUT
OE
P/S
tDODH tDODL tDODH
tOES tOEP
t3E
tOEW
tOER
SYMBOL
PARAMETER MIN TYP MAX UNITS
tOES
A/D Output Enable Setup Time
20 ns
tOER Output Enable Time 20 40 ns
t3E 3-State Enable Time 2 10 ns
tOEW OE Pulse Width 100 ns
tDODH
Data Output Delay, High Byte
12 ns
tDODL
Data Output Delay, Low Byte
12 ns
tOEP Parallel Port Setup Time 10 ns
9
®
VSP3100
Digital Data Output Sequence; 1-ch CCD Mode (B-ch: D4 = 1 and D5 = 0)
TIMING DIAGRAMS (Cont.)
Timing Specifications: VCC = +5V supply and normal output mode with the specified temperature range,
unless otherwise noted.
CCD Output
CK1
CK2
ADCCK
CDS Output
A/D Input
A/D Output (Normal Mode)
Pixel (n)
• • •
• • •
• • •
• • •
• • •
• • •
Pixel (n+1) Pixel (n+7)
t
CNV
t
CNV
t
SET
t
SET
(n) (n+1) (n+6) (n+7)
B (n+1) B (n+6) B (n+7)
B (n)
B (n)
Digital Data Output Sequence; 1-ch CIS Mode (B-ch: D4 = 1 and D5 = 0)
CIS Output
CK1
ADCCK
S/H Output
A/D Input
A/D Output (Normal Mode)
Pixel (n) • • •
• • •
• • •
• • •
• • •
Pixel (n+1) Pixel (n+7)
t
CNV
t
CNV
t
SET
t
SET
(n) (n+1) (n+6) (n+7)
B (n+1) B (n+6) B (n+7)
B (n)
B (n)
10
®
VSP3100
Digital Data Output Sequence; 3-ch CCD Mode, R > G > B Sequence
TIMING DIAGRAMS (Cont.)
Timing Specifications: VCC = +5V supply and normal output mode with the specified temperature range,
unless otherwise noted.
Digital Data Output Sequence; 3-ch CIS Mode, R > G > B Sequence
CCD Output
CK1
CK2
ADCCK
CDS Output
A/D Input
A/D Output (Normal Mode)
Pixel (n) Pixel (n+1) Pixel (n+2)
t
SET
t
SET
t
CNV
t
CNV
(n) (n+1) (n+2)
R (n+1) G (n+1) B (n+1) R (n+2)
R (n) G (n) B (n)
R (n+1)
R (n) G (n) B (n)
CIS Output
CK1
ADCCK
S/H Output
A/D Input
A/D Output (Normal Mode)
Pixel (n) Pixel (n+1) Pixel (n+2)
t
SET
t
SET
t
CNV
t
CNV
(n) (n+1) (n+2)
R (n+1) G (n+1) B (n+1) R (n+2)
R (n) G (n) B (n)
R (n+1)
R (n) G (n) B (n)
11
®
VSP3100
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VCC = +5V supply, tADCCK = 6MHz, fCK1 = 2MHz, fCK2 = 2MHz, PGA Gain = 1, normal output mode, no load, unless otherwise specified.
PGA TRANSFER FUNCITON
SAMPLE QUALITY, N = 100
PGA Gain Setting
Gain
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
05 1015202530350
POWER DISSIPATION vs POWER SUPPLY
1 CH MODE
Power Supply Voltage (V)
Power Dissipation (mW)
500
450
400
350
300
250
200 5 5.34.7
POWER DISSIPATION vs POWER SUPPLY
3 CH MODE
Power Supply Voltage (V)
Power Dissipation (mW)
500
450
400
350
300
250
200 5 5.34.7
12
®
VSP3100
THEORY OF OPERATION
VSP3100 can be operated in one of the following four
modes:
(1) 1-Channel CCD
(2) 1-Channel CIS
(3) 3-Channel CCD
(4) 3-Channel CIS
1-CHANNEL CCD MODE
In this mode, the VSP3100 processes only one CCD signal
(D3 of the Configuration Register sets to “1”). The CCD
signal is AC-coupled to RINP, GINP, or BINP (depending
on D4, D5 of the Configuration Register). The CLP signal
enables internal biasing circuitry to clamp this input to a
proper voltage, so that internal CDS circuitry can work
properly. The VSP3100 input may be applied as a DC-
coupled input, which needs to be level-shifted to a proper
DC level.
The CDS takes two samples of the incoming CCD signals.
The CCD reset signal is taken on the falling edge of CK1 and
the CCD information is taken on the falling edge of CK2.
These two samples are then subtracted by the CDS and the
result is stored as a CDS output.
In this mode, only one of the three channels is enabled. Each
channel consists of a 10-bit Offset DAC (range from
–400mV to +400mV). A 3-to-1 analog MUX is inserted
between the CDSs and a high-performance 14-bit analog-to-
digital converter. The outputs of the CDSs are then multi-
plexed to the A/D converter for digitization. The analog
MUX is not cycling between channels in this mode. Instead,
it is connected to a specific channel, depending on the
contents of D4 and D5 in the Configuration Register.
The VSP3100 allows two types of output modes:
1) Normal (D7 of Configuration Register sets to “0”).
2) Demultiplexed (D7 of Configuration Register sets to “1”).
As specified in the “1-Channel CCD Mode” timing diagram,
the rising edge of CK1 must be in the HIGH period of
ADCCK, and at the same time, the falling edge of the CK2
must be in the LOW period of ADCCK. Otherwise, the
VSP3100 will not function properly.
1-CHANNEL CIS MODE
In this mode, the VSP3100 operates as a 1-channel sampler
and digitizer. Unlike CDS modes, the VSP3100 takes only
one sample on the falling edge of the CK1. Since only one
sample is taken, CK2 is grounded in this operation. The
input signal is DC coupled in most cases. Here, VSP3100
inputs are differential input. Using the Red channel as an
example, RINP is the CIS input signal, and INN is the CIS
common reference signal input. The same applies to the
Green channel (GINP and INN) and Blue channel (BINP
and INN).
In this mode, CDS becomes CIS (act like sample-and-hold).
Each channel consists of a 10-bit Offset DAC (range from
–400mV to +400mV).
A 3-to-1 analog MUX is inserted between the CISs and a
high-performance, 14-bit A/D converter. The outputs of the
CIS are then multiplexed to the A/D converter for digitiza-
tion. The analog MUX is not cycling between channels in
this mode. Instead, the analog MUX is connected to a
specific channel, depending on the contents of D4 and D5 in
the Configuration Register.
The VSP3100 allows two types of output modes:
1) Normal (D7 of Configuration Register sets to “0”).
2) Demultiplexed (D7 of Configuration Register sets to “1”).
As specified in the “1-Channel CIS Mode” timing diagram,
the active period of both CK1 (tCK1B) and CK2 (tCK2B) must
be in the LOW period of ADCCK. If it is in the HIGH period
of ADCCK, the VSP3100 will not function properly.
3-CHANNEL CCD MODE
In this mode, the VSP3100 can simultaneously process triple
output CCD signals. CCD signals are AC coupled to the
RINP, GINP, and BINP inputs. The CLP signal enables
internal biasing circuitry to clamp these inputs to a proper
voltage so that internal CDS circuitry can work properly.
VSP3100 inputs may be applied as a DC-coupled inputs,
which need to be level-shifted to a proper DC level.
The CDSs take two samples of the incoming CCD signals.
The CCD reset signals are taken on the falling edge of CK1
and the CCD information is taken on the falling edge of
CK2. These two samples are then subtracted by the CDSs
and the results are stored as a CDS output.
13
®
VSP3100
In this mode, three CDSs are used to process three inputs
simultaneously. Each channel consists of a 10-bit Offset
DAC (range from –400mV to +400mV). A 3-to-1 analog
MUX is inserted between the CDSs and a high-performance,
14-bit A/D converter. The outputs of the CDSs are then
multiplexed to the A/D converter for digitization. The ana-
log MUX is switched at the falling edge of CK2, and can be
programmed to cycle between the Red, Green, and Blue
channels. When D6 of the Configuration Register sets to
“0”, the MUX sequence is Red > Green > Blue. When D6
of the Configuration Register sets to “1”, the MUX sequence
is Blue > Green > Red.
MUX resets at the falling edge of CK1. In the case of a
Red > Green > Blue sequence, it resets to “R”, and in the
case of a Blue > Green > Red sequence, it resets to “B”.
The VSP3100 allows two types of output modes:
1) Normal (D7 of Configuration Register sets to “0”).
2) Demultiplexed (D7 of Configuration Register sets to “1”).
As specified in the “3-Channel CCD Mode” timing diagram,
the falling edge of CK2 must be in the LOW period of
ADCCK. If the falling edge of CK2 is in the HIGH period
of ADCCK (in the timing diagram, ADCCK for sampling
B-channel), the VSP3100 will not function properly.
3-CHANNEL CIS MODE
In this mode, the VSP3100 is operated as 3-channel sam-
plers and a digitizer. Unlike CCD modes, VSP3100 takes
only one sample on the falling edge of CK1 for each input.
Since only one sample is taken, CK2 is grounded in this
operation. The input signals are DC coupled in most cases.
Here, the VSP3100 inputs allow differential inputs. Using
the Red channel as an example, RINP is the CIS input signal,
and INN is the CIS common reference signal input. The
same applies to the Green channel (GINP and INN) and Blue
channel (BINP and INN).
In this mode, three CDSs become CISs (act like sample-and-
hold) to process three inputs simultaneously. Each channel
consists of a 10-bit Offset DAC (range from –400mV to
+400mV). A 3-to-1 analog MUX is inserted between the
CISs and a high-performance, 14-bit A/D converter. The
outputs of the CIS are then multiplexed to the A/D converter
for digitization. The analog MUX is switched at the falling
edge of CK2, and can be programmed cycling between the
Red, Green, and Blue channels. When D6 of the
Configuration Register sets to “0”, the MUX sequence is
Red > Green > Blue. When D6 of the Configuration Register
sets to “1”, the MUX sequence is Blue > Green > Red.
MUX resets at the falling edge of CK1. In the case of a
Red > Green > Blue sequence, it resets to “R”, and in the
case of a Blue > Green> Red sequence, it resets to “B”.
The VSP3100 allows two types of output modes:
1) Normal (D7 of Configuration Register sets to “0”).
2) Demultiplexed (D7 of Configuration Register sets to “1”).
As specified in the “3-Channel CIS Mode” timing diagram,
the falling edge of CK1 must be in the LOW period of
ADCCK. If the falling edge of CK1 is in the HIGH period
of ADCCK (in the timing diagram, ADCCK for sampling
B-channel), the VSP3100 will not function properly.
DIGITAL OUTPUT FORMAT
The Digital Output Format is shown in Table I. The VSP3100
can be operated in one of the following two digital output
modes:
(1) Normal output.
(2) Demultiplexed (B13-based Big Endian Format).
In Normal mode, the VSP3100 outputs the 14-bit data by B0
(pin 25) through B13 (pin 38) simultaneously.
In Demultiplexed mode, VSP3100 outputs the high byte
(upper 8 bits) by B6 (pin 31) through B13 (pin 38) at the
rising edge of ADCCK “HIGH”, then outputs the low byte
(lower 6 bits) by B8 (pin 33) through B13 (pin 38) at the
falling edge of ADCCK.
An 8-bit interface can be used between the VSP3100 and the
Digital Signal Processor, allowing for a low-cost system
solution.
BIT B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
High Byte B13 B12 B11 B10 B9 B8 B7 B6 Low Low Low Low Low Low
Low Byte B5 B4 B3 B2 B1 B0 Low Low Low Low Low Low Low Low
TABLE I. Digital Output Format.
14
®
VSP3100
DIGITAL OUTPUTS
The digital outputs of the VSP3100 are designed to be
compatible with both high-speed TTL and CMOS logic
families. The driver stage of the digital outputs is supplied
through a separate supply pin, VDRV (pin 41), which is not
connected to the analog supply pins (VCC). By adjusting the
voltage on VDRV, the digital output levels will vary respec-
tively. Thus, it is possible to operate the VSP3100 on a +5V
analog supply while interfacing the digital outputs to 3V
logic. It is recommended to keep the capacitive loading on
the data lines as low as possible (typically less than 15pF).
Larger capacitive loads demanding higher charging current
surges can feed back to the analog portion of the VSP3100
and influence the performance. If necessary, external buff-
ers or latches may be used, providing the added benefit of
isolating the VSP3100 from any digital noise activities on
the bus, coupling back high-frequency noise. In addition,
resistors in series with each data line may help minimize the
surge current. Their use depends on the capacitive loading
seen by the converter. As the output levels change from low
to high and high to low, values in the range of 100 to 200
will limit the instantaneous current the output stage has to
provide for recharging the parasitic capacitances.
PROGRAMMABLE GAIN AMPLIFIER
VSP3100 has one Programmable Gain Amplifier (PGA),
and it is inserted between the CDSs and the 3:1 MUX. The
PGA is controlled by a 5-bit of Gain Register and each
channel (Red, Green, and Blue) has its own Gain Register.
The gain varies from 1 to 4.44 (0dB to 13dB), and the curve
has log characteristics. Gain Register Code all “0” corre-
sponds to minimum gain, and Code all “1” corresponds to
maximum gain.
The transfer function of the PGA is:
Gain = 4/(4 – 0.1 • x)
where, x is the integer representation of the 5-bit PGA gain
register.
Figure 1 shows the PGA transfer function plot.
INPUT CLAMP
The input clamp should be used for 1-channel and 3-channel
CCD mode, and it will be enabled when both CLP and CK1
are set to HIGH.
Bit Clamp: the input clamp is always enabled.
Line Clamp: enables during the dummy pixel interval at
every horizontal line, and disables during the effective pixel
interval.
Generally, “Bit Clamp” is used for many scanner applica-
tions, however, “Line Clamp” is used instead of “Bit Clamp”
when the clamp noise is impressive.
CHOOSING THE AC INPUT COUPLING
CAPACITORS
The purpose of the Input Coupling Capacitor is to isolate the
DC offset of the CCD array from affecting the VSP3100
input circuitry. The internal clamping circuitry is used to
restore the necessary DC bias to make the VSP3100 input
circuitry functional. Internal clamp voltage, VCLAMP, is set
when both the CLP pin and CK1 are set high. VCLAMP
changes depending on the value of VREF. VCLAMP is 2.5V if
VREF is set to 1V (D1 of the Configuration Register set to
“0”), and VCLAMP is 3V if VREF is set to 1.5V (D1 of the
Configuration Register set to “1”).
FIGURE 1. PGA Transfer Plot.
PGA TRANSFER FUNCTION
PGA Gain Setting
5 10152025 310
Gain
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
PGA TRANSFER FUNCTION
PGA Gain Setting
5 10152025 310
Gain (dB)
14
12
10
8
6
4
2
0
15
®
VSP3100
There are many factors that decide what size of Input
Coupling Capacitor is needed. Those factors are CCD signal
swing, voltage difference between the Input Coupling Ca-
pacitor, leakage current of the VSP3100 input circuitry, and
the time period of CK1.
Figure 2 shows the equivalent circuit of the VSP3100 inputs.
CHOOSE CMAX AND CMIN
As mentioned, a large CIN is better if there is enough time for
the CLP signal to charge up CIN so that the input circuitry of
the VSP3100 can work properly. Typically, 0.01µF to 0.1µF
of CIN can be used for most cases.
In order to optimize CIN, the following two equations can be
used to calculate the maximum (CMAX) and minimum (CMIN)
values of CIN:
CMAX = (tCK1 • N)/[RSW • ln(VD/VERROR)]
where tCK1 is the time when both CK1 and CLP go HIGH,
and N is the number of black pixels; RSW is the switch
resistance of the VSP3100 (typically, driver impedance +
4k); VD is the droop voltage of CIN; VERROR is the voltage
difference between VS and VCLAMP.
CMIN = (I/VERROR) • t
where I is the leakage current of the VSP3100 input circuitry
(10nA is a typical number for this leakage current);
t is the clamp pulse period.
PROGRAMMING VSP3100
The VSP3100 consists of 3 CCD/CIS channels and a 14-bit
A/D. Each channel (Red, Green, and Blue) has its own
10-bit Offset and 5-bit Gain Adjustable Registers to be
programmed by the user. There is also an 8-bit Configura-
tion Register, on-chip, to program the different operation
modes. Those registers are shown in Table II.
In this equivalent circuit, Input Coupling Capacitor CIN, and
Sampling Capacitor C
1
, are constructed as a capacitor divider
(during CK1). For AC analysis, OP inputs are grounded.
Therefore, the sampling voltage, V
S
, (during CK1) is:
VS = (CIN/(CIN + C1)) • VIN
From the above equation, we know that a larger CIN makes
VS close to V IN. In other words, input signal, VIN, will not be
attenuated if CIN is large.
However, there is a disadvantage of using a large CIN. It will
take longer for the CLP signal to charge up CIN so that the
input circuitry of the VSP3100 can work properly.
OP
AMP
CIN
CLP
C1
4pF
CK1
CK2
C2
4pF
VCLAMP
VIN
CK1
FIGURE 2. Equivalent Circuit of VSP3100 Inputs.
TABLE II. On-Chip Registers.
ADDRESS POWER-ON
A2 A1 A0 REGISTER DEFAULT VALUE
0 0 0 Configuration Register (8-bit) All “0s”
0 0 1 Red Channel Offset Register (10-bit) All “0s”
0 1 0 Green Channel Offset Register (10-bit) All “0s”
0 1 1 Blue Channel Offset Register (10-bit) All “0s”
1 0 0 Red Channel Gain Register (5-bit) All “0s”
1 0 1 Green Channel Gain Register (5-bit) All “0s”
1 1 0 Blue Channel Gain Register (5-bit) All “0s”
1 1 1 Reserved
16
®
VSP3100
These registers can be accessed by the following two pro-
gramming modes:
(1) Parallel Programming Mode using digital data output
pins, with the data bus assigned as D0 to D9 (pins 25 to 34),
and the address bus as A0 to A2 (pins 35 to 37). It can be
used for both reading and writing operations. However, it
cannot be used by the Demultiplexed mode (when D7 of the
Configuration Register is set to “1”).
(2) Serial Programming Mode using a serial port, Serial Data
(SD), the Serial Shift Clock (SCLK), and Write Signal
(WRT) assigned.
It can be used only for writing operations; reading opera-
tions via the serial port are prohibited.
Table III shows how to access these modes.
Power-on default value is all “0s”, set to 3-channel CCD
mode with 1V internal reference, R > G > B MUX sequence,
and normal output mode.
For reading/writing to the Configuration Register, the ad-
dress will be A2 = “0”, A1 =“0”, and A0 = “0”.
For Example:
A 3-channel CCD with internal reference VREF = 1V (2V
full-scale input), R > G > B sequence and normal output
mode will be D0 = “0”, D1 = “0”, D2 =“0”, D3 = “0”,
D4 = “x (don’t care)”, D5 = “x (don’t care)”, D6 = “0”, and
D7 = “0”.
For this example, bypass VREF with an appropriate capacitor
(for example, 10µF to 0.1µF) when internal reference mode
is used.
Another Example:
A 1-channel CIS mode (Green channel) with an external
1.2V reference (2.4V full-scale input), Demultiplexed Out-
put mode will be D0 = “1”, D1 = “x (don’t care)”, D2 = “1”,
D3 = “1”, D4 = “0”, D5 = “1”, D6 = “x (don’t care)”, and
D7 = “1”.
For this example, VREF will be an input pin applied with
1.2V.
OFFSET REGISTER
Offset Registers control the analog offset input to channels
prior to the PGA. There is a 10-bit Offset Register on each
channel. The offset range varies from –400mV to +400mV.
The Offset Register uses a straight binary code. All “0s”
corresponds to –400mV, and all “1s” corresponds to +400mV
of the offset adjustment. The register code 200H corresponds
to 0mV of the offset adjustment. The Power-on default value
of the Offset Register is all ”0s”, so the offset adjustment
should be set to –400mV.
PGA GAIN REGISTER
PGA Gain Registers control the gain to channels prior to the
digitization by the A/D converter. There is a 5-bit PGA Gain
Register on each channel. The gain range varies from 1 to
4.44 (from 0dB to 13dB). The PGA Gain Register is a
straight binary code. All “0s” corresponds to an analog gain
of 0dB, and all “1s” corresponds to an analog gain of 13dB.
PGA Transfer function is log gain curve. Power-on default
value is all “0s”, so that it sets the gain of 0dB.
BIT LOGIC ‘0’ LOGIC ‘1’
D0 CCD mode CIS mode
D1 VREF = 1V VREF =1.5V
D2 Internal Reference External Reference
D3 3-channel Mode, 1-channel Mode,
D4 and D5 disabled D4 and D5 enabled
D4,D5 (disabled when 3-channel) D4 D5
00
1-channel mode, Red channel
01
1-channel mode, Green channel
10
1-channel mode, Blue channel
D6 MUX Sequence MUX Sequence
Red > Green > Blue Blue > Green >Red
D7 Normal output mode Demultiplexed output mode
TABLE IV. Configuration Register Design.
OE P/S MODE
0 0 Digital data output enabled, Serial mode enabled
0 1 Prohibit mode
1 0 Digital data output disabled, Serial mode enabled
1 1 Digital data output disabled, Parallel mode enabled
TABLE III. Access Mode for Serial and Parallel Port.
CONFIGURATION REGISTER
The Configuration Register design is shown in Table IV.
17
®
VSP3100
OFFSET AND GAIN CALIBRATION SEQUENCE
When the VSP3100 is powered on, it will be initialized as a
3-Channel CCD, 1V internal reference mode (2V full-scale)
with an analog gain of 1, and normal output mode. This
mode is commonly used for CCD scanner applications. The
calibration procedure is done at the very beginning of the
scan.
To calibrate the VSP3100, use the following procedure:
1. Set the VSP3100 to the proper mode.
2. Set Offset to 0mV (control code: 00H), and PGA gain to
1 (control code: 200H).
3. Scan dark line.
4. Calculate the pixel offsets according to the A/D Converter
output.
5. Readjust input Offset Registers.
6. Scan white line.
7. Calculate gain. It will be the A/D Converter full-scale
divided by the A/D Converter output when the white line
is scanned.
8. Set the Gain Register. If the A/D Converter output is not
close to full-scale, go back to item 3. Otherwise, the
calibration is done.
The calibration procedure is started at the very beginning of
the scan. Once calibration is done, registers on the VSP3100
will keep this information (offset and gain for each channel)
during the operation.
RECOMMENDATION FOR POWER SUPPLY AND
GROUNDING
Proper grounding, bypassing, short lead length, and the use
of ground planes are particularly important for high-fre-
quency designs. Multi-layer PC boards are recommended
for the best performance since they offer distinct advantages
such as minimization of ground impedance, separation of
signal layers by ground layers, etc.
It is recommended that analog and digital ground pins of the
VSP3100 be joined together at the IC and connected only to
the analog ground of the system. The VSP3100 has several
analog supply pins (VCC), so the VSP3100 should be treated
as an analog component, and all supply pins should be
powered by the analog supply on your system. This will
ensure the most consistent results since digital supply lines
often carry high levels of noise that would otherwise be
coupled into the converter and degrade the achievable per-
formance.
As the result of the high operation speed, the converter also
generates high-frequency current transients and noise that
are fed back into the supply and reference lines. This
requires that the supply and reference pins be sufficiently
decoupled with ceramic capacitors.
18
®
VSP3100
FIGURE 3. Demo Board Schematic (DEM-VSP3100).
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
VSP3100Y ACTIVE LQFP PT 48 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
VSP3100Y/2K ACTIVE LQFP PT 48 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
VSP3100Y/2KG4 ACTIVE LQFP PT 48 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
VSP3100YG4 ACTIVE LQFP PT 48 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com 7-May-2008
Addendum-Page 1
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0 (mm) B0 (mm) K0 (mm) P1
(mm) W
(mm) Pin1
Quadrant
VSP3100Y/2K LQFP PT 48 2000 330.0 17.4 9.5 9.5 2.0 12.0 16.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 18-Oct-2008
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
VSP3100Y/2K LQFP PT 48 2000 346.0 346.0 33.0
PACKAGE MATERIALS INFORMATION
www.ti.com 18-Oct-2008
Pack Materials-Page 2
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