10-Channel Gamma Buffer with VCOM Driver
ADD8710
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2004–2007 Analog Devices, Inc. All rights reserved.
FEATURES
Single-supply operation: 4.5 V to 18 V
Upper/lower buffers swing to VS/GND
Gamma continuous output current: >10 mA
VCOM peak output current: 250 mA
Offset voltage: 12 mV
Slew rate: 8 V/μs
Unity gain stable with large capacitive loads
Supply current: 700 μA per amplifier
Compact 28-lead TSSOP
Pb-free package
Drop-in replacement for BUF11702
APPLICATIONS
TFT LCD monitor panels
TFT LCD notebook panels
GENERAL DESCRIPTION
The ADD8710 is a low cost, 10-channel gamma buffer with a
VCOM driver that operates from a single supply. The part is
designed for high resolution TFT LCD panels and is built on an
advanced, high voltage CBCMOS process.
The gamma buffers have a high slew rate, minimum 10 mA
output current, and a high capacitive load drive capability. The
VCOM buffer is capable of delivering 250 mA of peak current and
can also drive large capacitive loads. The ADD8710 offers a
wide supply range and offset voltages below 12 mV.
The ADD8710 is specified over the −40°C to +85°C tempera-
ture range and is available in a Pb-free, 28-lead TSSOP package.
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
S
GND
NC
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUTCOM
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ADD8710
GND
NC
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
IN9
IN10
INCOM
V
S
04889-001
NC = NO CONNECT
Figure 1. 28-Lead TSSOP (RU Suffix)
FUNCTIONAL BLOCK DIAGRAM
1
ADD8710
V
S
GND
NC
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUTCOM
GND
NC
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
IN9
IN10
INCOM
V
S
04889-002
2
3
4
5
6
7
8
9
10
V
COM
Figure 2.
ADD8710
Rev. B | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Pin Configuration............................................................................. 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................4
Thermal Resistance.......................................................................4
ESD Caution...................................................................................4
Typical Performance Characteristics ..............................................5
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 10
REVISION HISTORY
6/07—Rev. A to Rev. B
Changes to Figure 18........................................................................ 7
3/05—Rev. 0 to Rev. A
Change to Features ........................................................................... 1
Changes to Specifications................................................................ 3
Change to Absolute Maximum Ratings......................................... 4
6/04—Revision 0: Initial Version
ADD8710
Rev. B | Page 3 of 12
SPECIFICATIONS
VS = 16 V, VCM = VS/2, TA @ 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Condition Min Typ Max Unit
INPUT CHARACTERISTICS Applies to all channels
Offset Voltage VOS 4 12 mV
Offset Voltage Drift ∆VOS/∆T −40°C ≤ TA ≤ +85°C 5 μV/°C
Input Bias Current IB 0.5 1.1 μA
−40°C ≤ TA ≤ +85°C 1.5 μA
Input Impedance ZIN 400 kΩ
Input Capacitance CIN 1 pF
BUFFER CHARACTERISTICS
Common-Mode Input Range VCMM
Buffer 1 to Buffer 5 1.25 VS V
Buffer 6 to Buffer 10 0 VS − 1.25 V
Output Voltage High (V1) VOH V
S = 16 V, VIN = 16 V, IL = 10 mA 15.82 15.9 V
V
S = 10 V, VIN = 9.8 V, IL = 10 mA 9.75 9.8 V
−40°C ≤ TA ≤ +85°C 9.7 V
Output Voltage High (V2 to V5) VOH V
S = 10 V, VIN = 8.5 V, IL = 10 mA 8.45 8.5 V
−40°C ≤ TA ≤ +85°C 8.4 V
Output Voltage High (V6 to V10) VOH V
S = 10 V, VIN = 8 V, IL = 10 mA 7.95 8 V
−40°C ≤ TA ≤ +85°C 7.9 V
Output Voltage Low (V1 to V5) VOL V
S = 10 V, VIN = 2 V, IL = 10 mA 2 2.05 V
−40°C ≤ TA ≤ +85°C 2.10 V
Output Voltage Low (V6 to V9) VOL V
S = 10 V, VIN = 1.5 V, IL = 10 mA 1.5 1.55 V
−40°C ≤ TA ≤ +85°C 1.60 V
Output Voltage Low (V10) VOL V
S = 16 V, VIN = 0 V, IL = 10 mA 0.1 0.175 V
V
S = 10 V, VIN = 0.2 V, IL = 10 mA 0.2 0.25 V
−40°C ≤ TA ≤ +85°C 0.3 V
Continuous Output Current IOUT 10 mA
Peak Output Current IPK V
S = 16 V 100 mA
VCOM CHARACTERISTICS
Common-Mode Input Range VCMM 0 VS − 1.25 V
Output Voltage High VOH V
S = 10 V, VIN = 8 V, IL = 30 mA 7.95 8 V
−40°C ≤ TA ≤ +85°C 7.9 V
Output Voltage Low VOL V
S = 10 V, VIN = 2 V, IL = 30 mA 2 2.05 V
−40°C ≤ TA ≤ +85°C 2.10 V
Continuous Output Current IOUT 35 mA
Peak Output Current IPK V
S = 16 V 250 mA
SUPPLY CHARACTERISTICS
Supply Voltage VS 4.5 18 V
Power Supply Rejection Ratio PSRR VS = 4.5 V to 16.5 V, −40°C ≤ TA ≤ +85°C 70 90 dB
Total Supply Current ISY V
O = VS/2, no load 7.7 10 mA
−40°C ≤ TA ≤ +85°C 11.5 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ, CL = 200 pF 4 8 V/μs
Bandwidth BW −3 dB, RL = 10 kΩ, CL = 200 pF 5 MHz
Settling Time to 0.1% (Buffers) tS 1 V step, RL = 10 kΩ, CL = 200 pF 1.1 μs
Settling Time to 0.1% (VCOM) tS 1 V step, RL = 10 kΩ, CL = 200 pF 0.7 μs
Phase Margin ΦO RL = 10 kΩ, CL = 200 pF 45 Degrees
Channel Separation 75 dB
ADD8710
Rev. B | Page 4 of 12
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage (VS) 18.5 V
Input Voltage −0.5 V to VS + 0.5 V
Storage Temperature Range −65°C to +150°C
Operating Temperature Range −40°C to +85°C
Junction Temperature Range −65°C to +150°C
Lead Temperature 300°C
ESD Tolerance (HBM) ±2500 V
ESD Tolerance (MM) ±200 V
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may
affect device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type θJA Unit
28-Lead TSSOP (RU) 67.7 °C/W
ESD CAUTION
ADD8710
Rev. B | Page 5 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
800
700
600
500
400
300
200
100
0
–8 8–7 7–6 6–5 5–4 4–3 3–2 2–1 10
V
OS
(mV)
NUMBER OF UNITS
T = 25°C
V
S
= 4.5V TO 16V
04889-003
Figure 3. Input Offset Voltage Distribution
300
250
200
150
100
50
0
3
75
21
72
24
69
27
66
30
63
33
60
36
57
39
54
42
TCV
OS
(µV/°C)
NUMBER OF UNITS
04889-004
48
51
45
6
9
12
15
18
78
Figure 4. Input Offset Voltage Drift Distribution
5
4
3
2
1
0
TEMPERATURE (°C)
INPUT OFFSET VOL
T
AGE (mV)
04889-005
–4
–3
–2
–1
120
–40 –20 020
40 60 80 100
V1
V2
V3
V4
V5
V6
V7
V8
V9
V10
V
COM
Figure 5. Input Offset Voltage vs. Temperature
SUPPLY VOLTAGE (V)
SUPPLY CURRENT/BUFFER (mA)
04889-006
024681012141618
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Figure 6. Supply Current/Buffer vs. Supply Voltage
1.0
0.9
0.7
0.6
0.5
0.4
TEMPERATURE (°C)
SUPPLY CURRENT/BUFFER (mA)
04889-007
0
0.1
0.2
0.3
120–40 –20 0 20 40 60 80 100
0.8
Figure 7. Supply Current/Buffer vs. Temperature
600
400
200
0
TEMPERATURE (°C)
INPUT BIAS CURRENT (nA)
04889-008
–400
–200
120
–40 –20 020
40 60 80 100
V1
V2
V3
V4
V5
V6
V7
V8
V9
V10
V
COM
Figure 8. Input Bias Current vs. Temperature
ADD8710
Rev. B | Page 6 of 12
125
–5
–25
(dB)
–45
–65
15
35
55
75
95
105
100k10k1k100 1M 10M
FREQUENCY (Hz)
04889-009
V1–V10
VCOM
Figure 9. Power Supply Rejection Ratio vs. Frequency
0
0.5
1.0
1.5
2.5
OUTPUT VOLTAGE (V)
2.0
1011
00
LOAD CURRENT (mA)
04889-010
V
IN
= 0V
Figure 10. Channel 1 to Channel 5 Output Voltage Low vs. Load Current
0
0.2
0.6
0.8
1.4
OUTPUT VOLTAGE (V)
1.0
0.4
1.2
1011
00
LOAD CURRENT (mA)
04889-011
VIN = 0V
Figure 11. Channel 6 to Channel 10 Output Voltage Low vs. Load Current
0.2
0
0.1
0.6
0.7
1.0
OUTPUT VOLTAGE (V)
0.8
0.9
0.3
0.4
0.5
101 100
LOAD CURRENT (mA)
04889-012
V
IN
= 0V
Figure 12. Channel VCOM Output Voltage Low vs. Load Current
14.6
14.2
15.4
15.6
16.2
OUTPUT VOLTAGE (V)
15.8
14.4
16.0
14.8
15.0
15.2
101100
LOAD CURRENT (mA)
VIN = 16V
04889-013
Figure 13. Channel 1 Output Voltage High vs. Load Current
9.93
9.96
9.97
10.00
OUTPUT VOLTAGE (V)
9.98
9.99
9.94
9.95
101 100
LOAD CURRENT (mA)
VIN = 10V
04889-014
Figure 14. Channel 2 to Channel 5 Output Voltage High vs. Load Current
ADD8710
Rev. B | Page 7 of 12
–1
3
5
11
OUTPUT VOLTAGE (V)
7
9
1
101 100
LOAD CURRENT (mA)
04889-015
VIN = 10V
Figure 15. Channel 6 to Channel 10 Output Voltage High vs. Load Current
9.92
9.90
9.96
9.97
10.00
OUTPUT VOLTAGE (V)
9.98
9.91
9.99
9.93
9.94
9.95
101 100
LOAD CURRENT (mA)
04889-016
VIN = 10V
Figure 16. Channel VCOM Output Voltage High vs. Load Current
VOLTAGE (50mV/DIV)
TIME (2µs/DIV)
04889-017
R
L
= 2kΩ
C
L
= 100pF
Figure 17. Small Signal Transient Response
VOLTAGE (2V/DIV)
TIME (2µs/DIV)
04889-018
RL = 2kΩ
CL = 100pF
Figure 18. Large Signal Transient Response
20
–50
–60
(dB)
–70
–80
–40
–30
–20
–10
0
10
100k 1M 10M
FREQUENCY (Hz)
04889-019
1040pF
510pF
140pF
90pF
40pF
Figure 19. Channel 1 to Channel 5 Frequency Response vs. Capacitive Loading
100k 1M 10M
FREQUENCY (Hz)
04889-020
1040pF
510pF
140pF
90pF
40pF
20
–50
–60
(dB)
–70
–80
–40
–30
–20
–10
10
0
Figure 20. Channel 6 to Channel 10 Frequency Response vs. Capacitive Loading
ADD8710
Rev. B | Page 8 of 12
100k 1M 10M
FREQUENCY (Hz)
04889-021
1040pF
510pF
140pF
90pF
40pF
20
–50
–60
(dB)
–70
–80
–40
–30
–20
–10
10
0
Figure 21. Channel VCOM Frequency Response vs. Capacitive Loading
1M 10M 100M
FREQUENCY (Hz)
100k
04889-022
10kΩ
560Ω
150Ω
2kΩ
1kΩ
10
–25
–30
(dB)
–35
–40
–20
–15
–10
–5
5
0
Figure 22. Channel 1 to Channel 5 Frequency Response vs. Resistive Loading
1M 10M 100M
FREQUENCY (Hz)
100k
04889-023
10kΩ
560Ω
150Ω
2kΩ
1kΩ
10
–25
–30
(dB)
–35
–40
–20
–15
–10
–5
5
0
Figure 23. Channel 6 to Channel 10 Frequency Response vs. Resistive Loading
1M 10M 100M
FREQUENCY (Hz)
100k
04889-024
10kΩ
560Ω
150Ω
2kΩ
1kΩ
10
–25
–30
(dB)
–35
–40
–20
–15
–10
–5
5
0
Figure 24. Channel VCOM Frequency Response vs. Resistive Loading
IMPEDANCE (Ω)
100k10k1k 1M 10M
FREQUENCY (Hz)
100
0
750
675
600
525
450
375
300
225
150
75
04889-025
V
COM
GAMMA
Figure 25. Closed-Loop Output Impedance vs. Frequency
0
20
30
40
70
OVERSHOOT (%)
50
60
10
10010 1000
CAPACITIVE LOAD (pF)
04889-026
V
IN
= 100mV p-p
A
V
= 1
R
L
= 10kΩ
–OS
+OS
Figure 26. Channel 1 to Channel 5 Small Signal Overshoot vs. Load Capacitance
ADD8710
Rev. B | Page 9 of 12
0
20
30
40
60
OVERSHOOT (%)
50
10
10010 1000
CAPACITIVE LOAD (pF)
04889-028
V
IN
= 100mV p-p
A
V
= 1
R
L
= 10kΩ
–OS
+OS
0
20
30
40
70
OVERSHOOT (%)
50
60
10
10010 1000
CAPACITIVE LOAD (pF)
04889-027
V
IN
= 100mV p-p
A
V
= 1
R
L
= 10kΩ
–OS
+OS
Figure 27. Channel 6 to Channel 10 Small Signal Overshoot vs. Load Capacitance Figure 28. Channel VCOM Small Signal Overshoot vs. Load Capacitance
ADD8710
Rev. B | Page 10 of 12
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS MO-153-AE
28 15
141
8°
0°
SEATING
PLANE
C
OPLANARIT
Y
0.10
1.20 MAX
6.40 BSC
0.65
BSC
PIN 1
0.30
0.19 0.20
0.09
4.50
4.40
4.30
0.75
0.60
0.45
9.80
9.70
9.60
0.15
0.05
Figure 29. 28-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-28)
Dimensions shown in millimeters
ORDERING GUIDE
Model Temperature Range Package Description Package Option
ADD8710ARUZ1 −40°C to +85°C 28-Lead TSSOP RU-28
ADD8710ARUZ-REEL1−40°C to +85°C 28-Lead TSSOP RU-28
1 Z = RoHS Compliant Part.
ADD8710
Rev. B | Page 11 of 12
NOTES
ADD8710
Rev. B | Page 12 of 12
NOTES
©2004–2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D04889-0-6/07(B)
