10-Channel Gamma Buffer
with VCOM Driver
ADD8710
Rev. 0
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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
FEATURES
Single-supply operation: 4.5 V to 16.5 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
wide supply range and offset voltages below 12 mV.
The ADD8710 is specified over the −40°C to +85°C
temperature range and is available in a Pb-free 28-lead
TSSOP package.
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
04889-0-001
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
04889-0-002
2
3
4
5
6
7
8
9
10
V
COM
Figure 2.
ADD8710
Rev. 0 | Page 2 of 12
TABLE OF CONTENTS
Electrical Characteristics ................................................................. 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Typical Performance Characteristics ..............................................5
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 10
REVISION HISTORY
6/04—Revision 0: Initial Version
ADD8710
Rev. 0 | Page 3 of 12
ELECTRICAL CHARACTERISTICS
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
Output Voltage High (V1) VOH VS = 16 V, VI = 16 V, IL = 10 mA 15.82 15.9 V
V
S = 10 V, VI = 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 VS = 10 V, VI = 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 VS = 10 V, VI= 8 V, IL= 10 mA 7.95 8 V
–40°C ≤ TA≤ +85°C 7.9 V
Output Voltage Low (V1 to V5) VOL VS = 10 V, VI = 2 V, IL = 10 mA 2 2.05 V
−40°C ≤ TA≤ +85°C 2.10 V
Output Voltage Low (V6 to V9) VOL VS = 10 V, VI = 1.5 V, IL = 10 mA 1.5 1.55 V
–40°C ≤ TA ≤ +85°C 1.60 V
Output Voltage Low (V10) VOL VS = 16 V, VI = 0 V, IL = 10 mA 0.1 0.175 V
V
S = 10 V, VI = 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 VS = 16 V 100 mA
VCOM CHARACTERISTICS
Output Voltage High VOH VS = 10 V, VI = 8 V, IL = 30 mA 7.95 8
–40°C ≤ TA≤ +85°C 7.9
Output Voltage Low VOL VS = 10 V, VI = 2 V, IL = 30 mA 2 2.05
–40°C ≤ TA ≤ +85°C 2.10
Continuous Output Current IOUT 35 mA
Peak Output Current IPK VS = 16 V 250 mA
SUPPLY CHARACTERISTICS
Supply Voltage VS 4.5 16.5 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 VO = 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 Øo RL = 10 kΩ, CL = 200 pF 45 Degree
Channel Separation 75 dB
ADD8710
Rev. 0 | Page 4 of 12
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage (VS) 18 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 Range 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.
Table 3. Package Characteristics
Package Type θJA1Unit
28-Lead TSSOP (RU) 67.7 °C/W
1 θJA is specified for worst case conditions, i.e., θJA is specified for devices
soldered on to a circuit board for surface mount packages.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
ADD8710
Rev. 0 | 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
VOS (mV)
NUMBER OF UNITS
T = 25°C
VDD = 4.5V TO 16V
04889-0-003
Figure 3. Input Offset Voltage
300
250
200
150
100
50
0
3
75
21
72
24
69
27
66
30
63
33
60
36
57
39
54
42
TCVOS (µV/°C)
NUMBER OF UNITS
04889-0-004
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 VOLTAGE (mV)
04889-0-005
–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)
04889-0-006
0 2 4 6 8 10 12 14 16 18
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Figure 6. Supply Current/Buffer v. Supply Voltage
1.0
0.9
0.7
0.6
0.5
0.4
TEMPERATURE (°C)
SUPPLY CURRENT/BUFFER (mA)
04889-0-007
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)
04889-0-008
–400
–200
120
–40 –20 020
40 60 80 100
V1
V2
V3
V4
V5
V6
V7
V8
V9
V10
VCOM
Figure 8. Input Bias Current vs. Temperature
ADD8710
Rev. 0 | Page 6 of 12
125
–5
–25
(dB)
–45
–65
15
35
55
75
95
105
100k10k1k100 1M 10M
FREQUENCY (Hz)
04889-0-010
V1–V10
V
COM
Figure 9. Power Supply Rejection Ratio vs. Frequency
0
0.5
1.0
1.5
2.5
OUTPUT VOLTAGE (V)
2.0
101 100
LOAD CURRENT (mA)
04889-0-011
V
IN
= 0V
Figure 10. Chan 1-5 Output Voltage Low vs. I Load
0
0.2
0.6
0.8
1.4
OUTPUT VOLTAGE (V)
1.0
0.4
1.2
101 100
LOAD CURRENT (mA)
04889-0-012
V
IN
= 0V
Figure 11. Chan 6-10 Output Voltage Low vs. I Load
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)
04889-0-013
V
IN
= 0V
Figure 12. Chan VCOM Output Voltage Low vs. I Load
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
101 100
LOAD CURRENT (mA)
04889-0-014
V
IN
= 16V
Figure 13. Chan 1 Output Voltage High vs. I Load
9.93
9.96
9.97
10.00
OUTPUT VOLTAGE (V)
9.98
9.99
9.94
9.95
101 100
LOAD CURRENT (mA)
04889-0-015
V
IN
= 10V
Figure 14. Chan 2-5 Output Voltage High vs. I Load
ADD8710
Rev. 0 | Page 7 of 12
–1
3
5
11
OUTPUT VOLTAGE (V)
7
9
1
101 100
LOAD CURRENT (mA)
04889-0-016
V
IN
= 10V
Figure 15. Chan 6-10 Output Voltage High vs. I Load
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)
04889-0-017
V
IN
= 10V
Figure 16. Chan VCOM Output Voltage High vs. I Load
VOLTAGE (50mV/DIV)
TIME (2µs/DIV)
04889-0-018
R
L
= 2kΩ
C
LOAD
= 100pF
Figure 17. Small-Signal Transient Response
VOLTAGE (4V/DIV)
TIME (2µs/DIV)
04889-0-019
R
L
= 2kΩ
C
LOAD
= 100pF
Figure 18. Large-Signal Transient Response
20
–50
–60
(dB)
–70
–80
–40
–30
–20
–10
0
10
100k 1M 10M
FREQUENCY (Hz)
04889-0-020
1040pF
510pF
140pF 90pF
40pF
Figure 19. Chan 1-5 Frequency Response vs. Capacitive Loading
100k 1M 10M
FREQUENCY (Hz)
04889-0-021
1040pF
510pF
140pF90pF
40pF
20
–50
–60
(dB)
–70
–80
–40
–30
–20
–10
10
0
Figure 20. Chan 6-10 Frequency Response vs. Capacitive Loading
ADD8710
Rev. 0 | Page 8 of 12
100k 1M 10M
FREQUENCY (Hz)
04889-0-022
1040pF
510pF
140pF
90pF
40pF
20
–50
–60
(dB)
–70
–80
–40
–30
–20
–10
10
0
Figure 21. Chan VCOM Frequency Response vs. Capacitive Loading
1M 10M 100M
FREQUENCY (Hz)
100k
04889-0-023
10k
Ω
560
Ω
150
Ω
2k
Ω
1k
Ω
10
–25
–30
(dB)
–35
–40
–20
–15
–10
–5
5
0
Figure 22. Chan 1-5 Frequency Response vs. Resistive Loading
1M 10M 100M
FREQUENCY (Hz)
100k
04889-0-024
10k
Ω
560
Ω
150
Ω
2k
Ω
1k
Ω
10
–25
–30
(dB)
–35
–40
–20
–15
–10
–5
5
0
Figure 23. Chan 6-10 Frequency Response vs. Resistive Loading
1M 10M 100M
FREQUENCY (Hz)
100k
04889-0-025
10k
Ω
560
Ω
150
Ω
2k
Ω
1k
Ω
10
–25
–30
(dB)
–35
–40
–20
–15
–10
–5
5
0
Figure 24. Chan 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
04889-0-026
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)
04889-0-027
V
IN
= 100mV p-p
A
V
= 1
R
L
= 10k
Ω
–OS
+OS
Figure 26. Chan 1-5 Small Signal Overshoot vs. Load Capacitance
ADD8710
Rev. 0 | Page 9 of 12
0
20
30
40
70
OVERSHOOT (%)
50
60
10
10010 1000
CAPACITIVE LOAD (pF)
04889-0-028
V
IN
= 100mV p-p
A
V
= 1
R
L
= 10k
Ω
–OS
+OS
Figure 27. Chan 6-10 Small Signal Overshoot vs. Load Capacitance
0
20
30
40
60
OVERSHOOT (%)
50
10
10010 1000
CAPACITIVE LOAD (pF)
04889-0-029
V
IN
= 100mV p-p
A
V
= 1
R
L
= 10k
Ω
–OS
+OS
Figure 28. Chan VCOM Small Signal Overshoot vs. Load Capacitance
ADD8710
Rev. 0 | Page 10 of 12
OUTLINE DIMENSIONS
28 15
141
8°
0°
COMPLIANT TO JEDEC STANDARDS MO-153AE
SEATING
PLANE
COPLANARITY
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)
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 = Pb-free part.
ADD8710
Rev. 0 | Page 11 of 12
NOTES
ADD8710
Rev. 0 | Page 12 of 12
NOTES
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D04889-0-6/04(0)
