10-Channel Gamma Buffer with VCOM Driver ADD8710

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1 1-Channel Gamma Buffer with VCOM Driver ADD871 FEATURES Single-supply operation: 4.5 V to 18 V Upper/lower buffers swing to VS/GND Gamma continuous output current: >1 ma VCOM peak output current: 25 ma Offset voltage: 12 mv Slew rate: 8 V/μs Unity gain stable with large capacitive loads Supply current: 7 μa per amplifier Compact 28-lead TSSOP Pb-free package Drop-in replacement for BUF1172 APPLICATIONS TFT LCD monitor panels TFT LCD notebook panels GENERAL DESCRIPTION The ADD871 is a low cost, 1-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 1 ma output current, and a high capacitive load drive capability. The VCOM buffer is capable of delivering 25 ma of peak current and can also drive large capacitive loads. The ADD871 offers a wide supply range and offset voltages below 12 mv. The ADD871 is specified over the 4 C to +85 C temperature range and is available in a Pb-free, 28-lead TSSOP package. PIN CONFIGURATION V S 1 NC 2 OUT1 3 OUT2 4 OUT3 5 OUT4 6 OUT5 7 OUT6 8 OUT7 9 OUT8 1 OUT9 11 OUT1 12 OUTCOM 13 GND 14 ADD V S 27 NC 26 IN1 25 IN2 24 IN3 23 IN4 22 IN5 21 IN6 2 IN7 19 IN8 18 IN9 17 IN1 16 INCOM 15 GND NC = NO CONNECT Figure Lead TSSOP (RU Suffix) FUNCTIONAL BLOCK DIAGRAM V S ADD871 V S NC NC OUT1 1 IN1 OUT2 2 IN2 OUT3 3 IN3 OUT4 4 IN4 OUT5 5 IN OUT6 6 IN6 OUT7 7 IN7 OUT8 8 IN8 OUT9 9 IN9 OUT1 1 IN1 OUTCOM V COM INCOM GND Figure 2. GND 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 916, Norwood, MA , U.S.A. Tel: Fax: Analog Devices, Inc. All rights reserved.

2 ADD871 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... 1 Ordering Guide... 1 REVISION HISTORY 6/7 Rev. A to Rev. B Changes to Figure /5 Rev. to Rev. A Change to Features... 1 Changes to Specifications... 3 Change to Absolute Maximum Ratings /4 Revision : Initial Version Rev. B Page 2 of 12

3 ADD871 SPECIFICATIONS VS = 16 V, VCM = VS/2, 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 4 C TA +85 C 5 μv/ C Input Bias Current IB μa 4 C TA +85 C 1.5 μa Input Impedance ZIN 4 kω Input Capacitance CIN 1 pf BUFFER CHARACTERISTICS Common-Mode Input Range VCMM Buffer 1 to Buffer VS V Buffer 6 to Buffer 1 VS 1.25 V Output Voltage High (V1) VOH VS = 16 V, VIN = 16 V, IL = 1 ma V VS = 1 V, VIN = 9.8 V, IL = 1 ma V 4 C TA +85 C 9.7 V Output Voltage High (V2 to V5) VOH VS = 1 V, VIN = 8.5 V, IL = 1 ma V 4 C TA +85 C 8.4 V Output Voltage High (V6 to V1) VOH VS = 1 V, VIN = 8 V, IL = 1 ma V 4 C TA +85 C 7.9 V Output Voltage Low (V1 to V5) VOL VS = 1 V, VIN = 2 V, IL = 1 ma V 4 C TA +85 C 2.1 V Output Voltage Low (V6 to V9) VOL VS = 1 V, VIN = 1.5 V, IL = 1 ma V 4 C TA +85 C 1.6 V Output Voltage Low (V1) VOL VS = 16 V, VIN = V, IL = 1 ma V VS = 1 V, VIN =.2 V, IL = 1 ma.2.25 V 4 C TA +85 C.3 V Continuous Output Current IOUT 1 ma Peak Output Current IPK VS = 16 V 1 ma VCOM CHARACTERISTICS Common-Mode Input Range VCMM VS 1.25 V Output Voltage High VOH VS = 1 V, VIN = 8 V, IL = 3 ma V 4 C TA +85 C 7.9 V Output Voltage Low VOL VS = 1 V, VIN = 2 V, IL = 3 ma V 4 C TA +85 C 2.1 V Continuous Output Current IOUT 35 ma Peak Output Current IPK VS = 16 V 25 ma SUPPLY CHARACTERISTICS Supply Voltage VS V Power Supply Rejection Ratio PSRR VS = 4.5 V to 16.5 V, 4 C TA +85 C 7 9 db Total Supply Current ISY VO = VS/2, no load ma 4 C TA +85 C 11.5 ma DYNAMIC PERFORMANCE Slew Rate SR RL = 2 kω, CL = 2 pf 4 8 V/μs Bandwidth BW 3 db, RL = 1 kω, CL = 2 pf 5 MHz Settling Time to.1% (Buffers) ts 1 V step, RL = 1 kω, CL = 2 pf 1.1 μs Settling Time to.1% (VCOM) ts 1 V step, RL = 1 kω, CL = 2 pf.7 μs Phase Margin ΦO RL = 1 kω, CL = 2 pf 45 Degrees Channel Separation 75 db Rev. B Page 3 of 12

4 ADD871 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating Supply Voltage (VS) 18.5 V Input Voltage.5 V to VS +.5 V Storage Temperature Range 65 C to +15 C Operating Temperature Range 4 C to +85 C Junction Temperature Range 65 C to +15 C Lead Temperature 3 C ESD Tolerance (HBM) ±25 V ESD Tolerance (MM) ±2 V 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 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. Rev. B Page 4 of 12

5 33 54 ADD871 TYPICAL PERFORMANCE CHARACTERISTICS NUMBER OF UNITS T = 25 C V S = 4.5V TO 16V SUPPLY CURRENT/BUFFER (ma) V OS (mv) Figure 3. Input Offset Voltage Distribution SUPPLY VOLTAGE (V) Figure 6. Supply Current/Buffer vs. Supply Voltage NUMBER OF UNITS SUPPLY CURRENT/BUFFER (ma) TCV OS (µv/ C) TEMPERATURE ( C) Figure 4. Input Offset Voltage Drift Distribution Figure 7. Supply Current/Buffer vs. Temperature INPUT OFFSET VOLTAGE (mv) V1 V2 V3 V4 V5 V6 V7 V8 V9 V1 V COM INPUT BIAS CURRENT (na) V1 V2 V3 V4 V5 V6 V7 V8 V9 V1 V COM TEMPERATURE ( C) TEMPERATURE ( C) Figure 5. Input Offset Voltage vs. Temperature Figure 8. Input Bias Current vs. Temperature Rev. B Page 5 of 12

6 ADD V1 V V IN = V V COM k 1k 1k 1M 1M Figure 9. Power Supply Rejection Ratio vs. Frequency Figure 12. Channel VCOM Output Voltage Low vs. Load Current V IN = V V IN = 16V Figure 1. Channel 1 to Channel 5 Output Voltage Low vs. Load Current Figure 13. Channel 1 Output Voltage High vs. Load Current V IN = V 1. V IN = 1V Figure 11. Channel 6 to Channel 1 Output Voltage Low vs. Load Current Figure 14. Channel 2 to Channel 5 Output Voltage High vs. Load Current Rev. B Page 6 of 12

7 ADD R L = 2kΩ C L = 1pF VOLTAGE (2V/DIV) 1 V IN = 1V Figure 15. Channel 6 to Channel 1 Output Voltage High vs. Load Current TIME (2µs/DIV) Figure 18. Large Signal Transient Response V IN = 1V pF 51pF 14pF 9pF 4pF Figure 16. Channel VCOM Output Voltage High vs. Load Current k 1M 1M Figure 19. Channel 1 to Channel 5 Frequency Response vs. Capacitive Loading VOLTAGE (5mV/DIV) R L = 2kΩ C L = 1pF pF 51pF 14pF 9pF 4pF 6 7 TIME (2µs/DIV) Figure 17. Small Signal Transient Response k 1M 1M Figure 2. Channel 6 to Channel 1 Frequency Response vs. Capacitive Loading Rev. B Page 7 of 12

8 ADD pF 51pF 14pF 9pF 4pF kΩ 15Ω 2kΩ 1kΩ 56Ω k 1M 1M Figure 21. Channel VCOM Frequency Response vs. Capacitive Loading k 1M 1M 1M Figure 24. Channel VCOM Frequency Response vs. Resistive Loading kΩ 2kΩ 1kΩ 56Ω Ω IMPEDANCE (Ω) GAMMA 3 15 V COM k 1M 1M 1M Figure 22. Channel 1 to Channel 5 Frequency Response vs. Resistive Loading k 1k 1k 1M 1M Figure 25. Closed-Loop Output Impedance vs. Frequency kΩ 2kΩ 1kΩ 56Ω 7 6 V IN = 1mV p-p A V = 1 R L = 1kΩ Ω OVERSHOOT (%) OS +OS k 1M 1M 1M Figure 23. Channel 6 to Channel 1 Frequency Response vs. Resistive Loading CAPACITIVE LOAD (pf) Figure 26. Channel 1 to Channel 5 Small Signal Overshoot vs. Load Capacitance Rev. B Page 8 of 12

9 ADD V IN = 1mV p-p A V = 1 R L = 1kΩ 6 5 V IN = 1mV p-p A V = 1 R L = 1kΩ OS OVERSHOOT (%) OS +OS OVERSHOOT (%) OS CAPACITIVE LOAD (pf) Figure 27. Channel 6 to Channel 1 Small Signal Overshoot vs. Load Capacitance CAPACITIVE LOAD (pf) Figure 28. Channel VCOM Small Signal Overshoot vs. Load Capacitance Rev. B Page 9 of 12

10 ADD871 OUTLINE DIMENSIONS BSC PIN COPLANARITY.1.65 BSC MAX SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-153-AE Figure Lead Thin Shrink Small Outline Package [TSSOP] (RU-28) Dimensions shown in millimeters ORDERING GUIDE Model Temperature Range Package Description Package Option ADD871ARUZ 1 4 C to +85 C 28-Lead TSSOP RU-28 ADD871ARUZ-REEL 1 4 C to +85 C 28-Lead TSSOP RU-28 1 Z = RoHS Compliant Part. Rev. B Page 1 of 12

11 ADD871 NOTES Rev. B Page 11 of 12

Low Power, Precision, Auto-Zero Op Amps AD8538/AD8539 FEATURES Low offset voltage: 13 μv maximum Input offset drift: 0.03 μv/ C Single-supply operatio

Low Power, Precision, Auto-Zero Op Amps FEATURES Low offset voltage: 3 μv maximum Input offset drift:.3 μv/ C Single-supply operation: 2.7 V to 5.5 V High gain, CMRR, and PSRR Low input bias current: 25