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16 V Quad Operational Amplifier ADD8704 FEATURES Single-supply operation: 4.5 V to 16.5 V Upper/lower buffers swing to VDD/GND Continuous output current: 35 mA VCOM peak output current: 250 mA Offset voltage: 15 mV Slew rate: 6 V/s Unity gain stable with large capacitive loads Supply current: 700 A per amplifier Drop-in replacement for EL5420 PIN CONFIGURATIONS OUT A 1 -+ +- 14 OUT D -IN D +IN D V- +IN C -IN C OUT C 00001-0-0-1 00001-0-002 -IN A 2 +IN A 3 V+ 4 +IN B 5 -IN B 6 -+ +- 13 12 ADD8704 11 10 9 APPLICATIONS TFT LCD monitor panels TFT LCD notebook panels Communications equipment Portable instrumentation Electronic games OUT B 7 8 Figure 1. 14-Lead TSSOP (RU Suffix) 15 OUT A 14 OUT D 16 NC GENERAL DESCRIPTION The ADD8704 is a single-supply quad operational amplifier that has been optimized for today's low cost TFT LCD notebook and monitor panels. Output channels A and D swing to the rail for use as end-point gamma references. Output channels B and C provide high continuous and peak current drive for use as VCOM or repair amplifiers; they can also be used as midpoint gamma references. All four amplifiers have excellent transient response and have high slew rate and capacitive load drive capability. The ADD8704 is specified over the -40C to +85C temperature range and is available in either a 14-lead TSSOP or a 16-lead LFCSP package for thin, portable applications. Table 1. Input/Output Characteristics Channel A B C D VIH VDD - 1.7 V VDD - 1.7 V VDD VDD VIL GND GND GND GND + 1.7 V IO (mA) 15 35 35 15 ISC (mA) 150 250 250 150 13 NC -IN A 1 +IN A 2 V+ 3 +IN B 4 -IN A 5 OUT B 6 OUT C 7 -IN C 8 12 -IN D D ADD8704 TOP VIEW 11 +IN 10 V- 9 +IN C Figure 2. 16-Lead CSP (CP Suffix) 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 (c) 2003 Analog Devices, Inc. All rights reserved. ADD8704 TABLE OF CONTENTS Electrical Characteristics ................................................................. 3 Absolute Maximum Ratings............................................................ 5 Typical Performance Characteristics ............................................. 6 Application Information................................................................ 12 Theory.......................................................................................... 12 Input............................................................................................. 12 Output.......................................................................................... 12 Important Note........................................................................... 12 Outline Dimensions ....................................................................... 14 Ordering Guide .......................................................................... 14 REVISION HISTORY Revision 0: Initial Version Rev. 0 | Page 2 of 16 ADD8704 ELECTRICAL CHARACTERISTICS Table 2. VS = 16 V, VCM = VS/2, TA @ 25C, unless otherwise noted Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Offset Current Common-Mode Rejection Ratio Amp A Amp B Amp C Amp D Large Signal Voltage Gain Input Impedance Input Capacitance OUTPUT CHARACTERISTIS Output Voltage High (A) Optimized for Low Swing Output Voltage High (B) Optimized for VCOM Output Voltage High (C) Optimized for Midrange Output Voltage High (D) Optimized for High Swing Output Voltage Low (A) Optimized for Low Swing Output Voltage Low (B) Optimized for VCOM Output Voltage Low (C) Optimized for Midrange Output Voltage Low (D) Optimized for High Swing Continuous Output Current (A and D) Continuous Output Current (B and C) Peak Output Current (A and D) Peak Output Current (B and C) SUPPLY CHARACTERISTICS Supply Voltage Power Supply Rejection Ratio Total Supply Current Symbol VOS VOS/T IB IOS CMRR -40C TA +85C -40C TA +85C VCM = 0 to (VS - 1.7 V) VCM = 0 to (VS - 1.7 V) VCM = 0 to VS VCM = 1.7 V to VS RL = 10 k, VO = 0.5 to (VS - 0.5 V) Condition Min Typ 2 10 200 10 Max 15 1100 1500 100 250 Unit mV V/C nA nA nA nA dB dB dB dB V/mV k pF V V V V V V V V V V V V mV mV mV mV mV mV mV mV mV mV mV mV mA mA mA mA V dB mA mA -40C TA +85C -40C TA +85C AVO ZIN CIN VOH 54 54 54 54 1 95 95 95 95 10 400 1 15.985 15.75 15.995 15.9 15.995 15.9 15.99 15.85 20 80 5 50 5 50 50 375 15 35 50 200 VOH VOH VOH VOL VOL VOL VOL IL = 100 A IL = 5 mA -40C TA +85C IL = 100 A IL = 5 mA -40C TA +85C IL = 100 A IL = 5 mA -40C TA +85C IL = 100 A IL = 5 mA -40C TA +85C IL = 100 A IL = 5 mA -40C TA +85C IL = 100 A IL = 5 mA -40C TA +85C IL = 100 A IL = 5 mA -40C TA +85C IL = 100 A IL = 5 mA -40C TA +85C 15.6 15.5 15.8 15.75 15.8 15.75 15.75 15.65 200 300 150 250 150 250 500 600 IOUT IOUT IPK IPK VS PSRR ISY VS = 16 V VS = 16 V 4.5 70 16 90 2.8 3.4 4 VS = 4 V to 17 V, -40C TA +85C VO = VS/2, No Load -40C TA +85C Rev. 0 | Page 3 of 16 ADD8704 ELECTRICAL CHARACTERISTICS (CONTINUED) Parameter DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product -3 dB Bandwidth Phase Margin Channel Separation NOISE PERFORMANCE Voltage Noise Density (A, B, and C) Voltage Noise Density (D) Current Noise Density Symbol SR GBP BW Oo Condition RL = 2 k, CL = 200 pF RL = 10 k, CL = 40 pF RL = 10 k, CL = 40 pF RL = 10 k, CL = 40 pF Min 4 Typ 6 5.8 6.8 55 75 26 25 36 35 0.8 Max Unit V/s MHz MHz Degrees dB nV/Hz nV/Hz nV/Hz nV/Hz pA/Hz en en en en in f = 1 kHz f = 10 kHz f = 1 kHz f = 10 kHz f = 10 kHz Rev. 0 | Page 4 of 16 ADD8704 ABSOLUTE MAXIMUM RATINGS Table 3. ADD8704 Stress Ratings1 Parameter Supply Voltage (VS) Input Voltage Differential Input Voltage Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature Range ESD Tolerance (HBM) ESD Tolerance (MM) Rating 18 V -0.5 V to VS + 0.5 V VS -65C to +150C -40C to +85C -65C to +150C 300C 1500 V 175 V Table 4. Package Characteristics Package Type 14-Lead TSSOP (RU) 16-Lead LFCSP (CP) JA2 180 383 JC 35 303 Unit C/W C/W 1 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. 2 JA is specified for worst-case conditions, i.e., JA is specified for devices soldered onto a circuit board for surface-mount packages. 3 DAP is soldered down to PCB. 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 part 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. Rev. 0 | Page 5 of 16 ADD8704 TYPICAL PERFORMANCE CHARACTERISTICS 600 VS = 16V 500 QUANTITY OF AMPLIFIERS 10 8 6 OFFSET VOLTAGE (mV) VS = 16V 400 4 2 0 -2 -4 -6 -8 C B A 300 200 D 100 00001-0-003 0 -9 -7 -5 -3 -1 1 3 5 7 INPUT OFFSET VOLTAGE (mV) 9 11 -10 0 2 6 8 10 12 4 COMMON-MODE VOLTAGE (V) 14 16 Figure 3. Input Offset Voltage, VS = 16 V 20 18 16 VS = 16V Figure 6. Offset Voltage vs. Common-Mode Voltage 400 200 INPUT BIAS CURRENT (nA) A VS = 16V QUANTITY OF AMPLIFIERS 14 12 10 8 6 4 2 00001-0-004 0 -200 -400 -600 -800 00001-0-007 00001-0-006 D B C 0 0 10 20 30 40 50 60 TCVOS (V/C) 70 80 90 100 -1000 -60 -40 -20 0 20 40 TEMPERATURE (C) 60 80 100 Figure 4. Input Offset Voltage Drift, VS = 16 V 10 8 6 INPUT BIAS CURRENT (nA) Figure 7. Input Bias Current vs. Temperature 80 VS = 16V 60 INPUT OFFSET CURRENT (nA) A D B VS = 16V VCM = VS/2 40 20 0 -20 A -40 -60 D B 4 2 0 -2 -4 -6 -8 C C 00005-0-005 -10 -60 -40 -20 0 20 40 TEMPERATURE (C) 60 80 100 -80 -60 -40 -20 0 20 40 TEMPERATURE (C) 60 80 100 Figure 5. Input Bias Current vs. Temperature Figure 8. Input Offset Current vs. Temperature Rev. 0 | Page 6 of 16 00001-0-006 ADD8704 100k VS = 16V CHANNEL A 10k OUTPUT VOLTAGE (mV) OUTPUT VOLTAGE (mV) 10k 100k VS = 16V CHANNEL D 1k 1k 100 100 SINK 10 SOURCE 10 SOURCE SINK 1 1 00001-0-009 0.1 0.0001 0.001 0.01 0.1 1 LOAD CURRENT (mA) 10 100 0.1 0.0001 0.001 0.01 0.1 1 LOAD CURRENT (mA) 10 100 Figure 9. Channel A Output Voltage vs. Load Current 10k VS = 16V CHANNEL B 1k 1k 10k Figure 12. Channel D Output Voltage vs. Load Current VS = 4.5V SOURCE OUTPUT VOLTAGE (mV) 100 OUTPUT VOLTAGE (mV) D 100 A B, C 10 SOURCE 10 SINK 1 1 00001-0-010 0.1 0.0001 0.001 0.01 1 0.1 LOAD CURRENT (mA) 10 100 0.1 0.001 0.01 0.1 1 LOAD CURRENT (mA) 10 100 Figure 10. Channel B Output Voltage vs. Load Current 10k VS = 16V CHANNEL C 1k Figure 13. Output Source Voltage vs. Load Current, All Channels 10k VS = 4.5V SINK 1k OUTPUT VOLTAGE (mV) OUTPUT VOLTAGE (mV) D 100 A 100 SOURCE 10 SINK 1 10 B, C 1 0.1 0.0001 00001-0-011 0.001 0.01 0.1 1 LOAD CURRENT (mA) 10 100 0.1 0.001 0.01 0.1 1 LOAD CURRENT (mA) 10 100 Figure 11. Channel C Output Voltage vs. Load Current Figure 14. Output Sink Voltage vs. Load Current, All Channels Rev. 0 | Page 7 of 16 00001-0-014 00001-0-013 00001-0-010 ADD8704 16.00 0.80 15.95 C D 15.85 B SUPPLY CURRENT PER AMPLIFIER (mA) VS = 16V ISOURCE = 5mA VS = 16V 0.75 OUTPUT VOLTAGE (V) 15.90 0.70 15.80 A 15.75 0.65 00001-0-015 15.70 -60 -40 -20 0 20 40 TEMPERATURE (C) 60 80 100 0.60 -60 -40 -20 0 20 40 TEMPERATURE (C) 60 80 100 Figure 15. Output Source Voltage vs. Temperature 500 450 400 80 Figure 18. Supply Current vs. Temperature VS = 16V RL = 10k CL = 40pF 0 VS = 16V ISINK = 5mA D 60 45 PHASE SHIFT ( (Degrees) PHASE SHIFT (Degrees) 00001-0-020 00001-0-019 OUTPUT VOLTAGE (V) 350 300 250 200 150 100 50 0 -60 -40 -20 0 20 40 TEMPERATURE (C) GAIN (dB) 40 90 20 135 A B C 00001-0-016 0 180 60 80 100 -20 1k 10k 100k 1M FREQUENCY (Hz) 10M 225 100M Figure 16. Output Sink Voltage vs. Temperature 1.0 80 Figure 19. Frequency vs. Gain and Shift VS = 4.5V RL = 10k CL = 40pF 0 SUPPLY CURRENT PER AMPLIFIER (mA) 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 00001-0-017 40 45 60 GAIN (dB) 90 20 135 0 180 0 0 2 4 6 8 10 12 SUPPLY VOLTAGE (V) 14 16 18 -20 1k 10k 100k 1M FREQUENCY (Hz) 10M 225 100M Figure 17. Supply Current vs. Supply Voltage Figure 20. Frequency vs. Gain and Shift Rev. 0 | Page 8 of 16 00001-0-018 ADD8704 50 VS = 16V RL = 10k CL = 40pF COMMON-MODE REJECTION (dB) 120 VS = 16V 100 40 CLOSED-LOOP GAIN (dB) AV = 100 30 AV = 10 80 60 20 40 10 AV = 1 20 0 100 00001-0-021 1k 10k 100k FREQUENCY (Hz) 1M 10M 0 100 1k 10k 100k FREQUENCY (Hz) 1M 10M Figure 21. Closed-Loop Gain vs. Frequency 16 14 12 OUTPUT SWING (V p-p) 10 8 6 4 2 0 100 00001-0-020 Figure 24. Common-Mode Rejection vs. Frequency 100 VS = 16V VS = 16V RL = 10k AV = 1 COMMON-MODE REJECTION (dB) 80 +PSRR 60 PSRR 40 20 1k 10k 100k FREQUENCY (Hz) 1M 10M 0 100 1k 10k 100k FREQUENCY (Hz) 1M 10M Figure 22. Output Swing vs. Frequency 675 600 525 VS = 4.5V 450 AV = 1 100 90 80 70 Figure 25. Common-Mode Rejection vs. Frequency VS = 8V VIN = 50mV AV = 1 RL = 2k -OS OVERSHOOT (%) IMPEDANCE () 375 300 225 150 75 VS = 16V 00001-0-023 60 50 40 30 20 10 +OS 0 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 0 10 100 1k CAPACITIVE LOAD (pF) 10k Figure 23. Impedance vs. Frequency Figure 26. Overshoot vs. Capacitive Load Rev. 0 | Page 9 of 16 00001-0-026 00001-0-025 00001-0-024 ADD8704 20 RL = 10k 10 0 100pF -10 540pF -20 -30 -40 -50 100k 00001-0-027 50pF 1040pF VOLTAGE (3V/DIV) GAIN (dB) 1M FREQUENCY (Hz) 10M 30M TIME (40s/DIV) Figure 27.Gain vs. Capacitive Load 20 15 10 2k 1k 150 10k VOLTAGE (50mV/DIV) 5 0 GAIN (dB) -5 -10 -15 -20 -25 -30 100k 1M 10M FREQUENCY (Hz) 100M 00001-0-028 Figure 30. No Phase Reversal VS = 16V RL = 2k CLOAD = 100pF VS = 16V TIME (0.2s/DIV) Figure 28. Gain vs. Resistive Load 11 10 9 120pF 320pF 1nF 10nF VS = 16V Figure 31. Small-Signal Transient Response AMPLITUDE (V) 7 6 5 4 3 2 1 0 -200 520pF VOLTAGE (20mV/DIV) 8 VS = 16V ROUT SERIES = 33 CLOAD = 0.1F 200 600 1000 TIME (ns) 1400 1800 00001-0-029 00001-0-032 TIME (20s/DIV) Figure 29. Transient Load Response Figure 32. Small-Signal Transient Response Rev. 0 | Page 10 of 16 00001-0-031 00001-0-030 ADD8704 VDD = 16V RL = 2k CL = 100pF 70 60 VS = 16V MARKER SET @ 10kHz MARKER READING = 36.6nV/ Hz CHANNEL D VOLTAGE NOISE DENSITY (nV/ Hz) 00001-0-033 50 40 30 20 10 0 -10 00001-0-035 VOLTAGE (2V/DIV) TIME (2s/DIV) 0 5 10 15 FREQUENCY (Hz) 20 25 Figure 33. Large Signal Transient Response 70 60 VS = 16V MARKER SET @ 10kHz MARKER READING = 25.7nV/ Hz CHANNEL A, B, C Figure 35. Voltage Noise Density vs. Frequency VOLTAGE NOISE DENSITY (nV/ Hz) 50 40 30 20 10 0 -10 00001-0-034 0 5 10 15 FREQUENCY (Hz) 20 25 Figure 34. Voltage Noise Density vs. Frequency Rev. 0 | Page 11 of 16 ADD8704 APPLICATION INFORMATION THEORY The ADD8704 is designed for use in LCD gamma correction circuits. Depending on the panel architecture, between 4 and 18 different gamma voltages may be needed. These gamma voltages provide the reference voltages for the column driver RDACs. Due to the capacitive nature of LCD panels, it is necessary for these drivers to provide high capacitive load drive. In addition to providing gamma reference voltages, these parts are also capable of providing the VCOM voltage. VCOM is the center voltage common to all the LCD pixels. Since the VCOM circuit is common to all the pixels in the panel, the VCOM driver is designed to supply continuous currents up to 35 mA. Amplifier C is a rail-to-rail input range that makes the ADD8704 suitable for use anywhere on the RDAC as well as for VCOM applications. Amplifier D has an NPN follower input stage. This covers the upper rail to GND plus 1.7 V. This amplifier is suitable for the upper range of the RDAC. OUTPUT The outputs of the amplifiers have been designed to match the performance needs of the gamma correction circuit. All four of the amplifiers have rail-to-rail outputs, but the current drive capabilities differ. Since amplifier A is suited for voltages close to VSS (GND), the output is designed to sink more current than it sources; it can sink 15 mA of continuous current. Likewise, since amplifier D is primarily used for voltages close to VDD, it sources more current. Amplifier D can source 15 mA of continuous current. Amplifiers B and C are designed for use as either midrange gamma or VCOM amplifiers. They therefore sink and source equal amounts of current. Since they are used as VCOM amplifiers, they have a drive capability of up to 35 mA of continuous current. The nature of LCD panels introduces a large amount of parasitic capacitance from the column drivers as well as the capacitance associated with the liquid crystals via the common plane. This makes capacitive drive capability an important factor when designing the gamma correction circuit. INPUT The ADD8704 has four amplifiers specifically designed for the needs of an LCD panel. Figure 36 shows a typical gamma correction curve for a normally white twisted nematic LCD panel. The symmetric curve comes from the need to reverse the polarity on the LC pixels to avoid "burning" in the image. The application therefore requires gamma voltages that come close to both supply rails. To accommodate this transfer function, the ADD8704 has been designed to have four different amplifiers in one package. VDD VG1 VG2 GAMMA VOLTAGE VG3 VG4 VG5 VG6 VG7 VG8 VG9 VG10 VSS 0 16 32 GRAY SCALE BITS 48 64 00001-0-038 IMPORTANT NOTE Because of the asymmetric nature of amplifiers A and D, care must be taken to connect an input that forces the amplifiers to operate in their most productive output states. Amplifier D has very limited sink capabilities, while amplifier A does not source well. If more than one ADD8704 is used, set the amplifier D input to enable the amplifier output to source current and set the amplifier A input to force a sinking output current. This means making sure the input is above the midpoint of the common-mode input range for amplifier D and below the midpoint for amplifier A. Mathematically speaking, make sure VIN > VS/2 for amplifier D and VIN < VS/2 for amplifier A. Figure 37 shows an example using 4 ADD8704s to generate 10 gamma outputs. Note that the top three resistor tap-points are connected to the amplifier D inputs, thus assuring these channels will source current. Likewise, the bottom three resistor tap-points are connected to the amplifier A inputs to provide sinking output currents. Figure 36. LCD Gamma Correction Curve Amplifier A has a single-supply PNP input stage followed by a folded cascode stage. This provides an input range that goes to the bottom rail. This amplifier can therefore be used to provide the bottom voltage on the RDAC string. Amplifier B (PNP folded cascode) swings to the low rail as well, but it provides 35 mA continuous output current versus 15 mA. This buffer is suitable for lower RDAC range, middle RDAC range, or VCOM applications. Rev. 0 | Page 12 of 16 ADD8704 VDD ADD8704 TP 1 TP 1 D GAMMA 1 TP 2 TP 4 C GAMMA 4 TP 3 TP 5 B GAMMA 5 TP 4 TP 8 A GAMMA 8 VDD ADD8704 TP 5 RESISTOR STRING TP 2 D GAMMA 2 TP 6 TP 6 C GAMMA 6 TO COLUMN DRIVER TP 7 TP 7 B GAMMA 7 TP 8 TP 9 A GAMMA 9 VDD ADD8704 TP 9 TP 3 D GAMMA 3 TP 10 NC C NC VDD TP 10 A GAMMA 10 B VCOM 00001-0-039 Figure 37. Using Four ADD8704s to Generate 10 Gamma Outputs Rev. 0 | Page 13 of 16 ADD8704 OUTLINE DIMENSIONS 5.10 5.00 4.90 14 8 4.50 4.40 4.30 1 7 6.40 BSC PIN 1 1.05 1.00 0.80 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.19 0.20 0.09 8 0 0.75 0.60 0.45 SEATING COPLANARITY PLANE 0.10 COMPLIANT TO JEDEC STANDARDS MO-153AB-1 Figure 38. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU) Dimensions shown in millimeters 4.0 BSC SQ 0.60 MAX 0.60 MAX 13 12 16 1 PIN 1 INDICATOR 2.25 2.10 SQ 1.95 PIN 1 INDICATOR 0.65 BSC TOP VIEW 3.75 BSC SQ 0.75 0.60 0.50 12 MAX 0.80 MAX 0.65 TYP 0.05 MAX 0.02 NOM 0.35 0.28 0.25 0.20 REF COPLANARITY 0.08 BO TTOM VIEW 9 8 5 4 0.25 MIN 1.95 BSC 1.00 0.85 0.80 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-220-VGGC Figure 39. 16-Terminal Leadless Frame Chip Scale Package [LFCSP] (CP) Dimensions shown in millimeters ORDERING GUIDE Model ADD8704ARU ADD8704ARU-REEL ADD8704ARUZ1 ADD8704ARUZ-REEL1 ADD8704ACPZ-R21 ADD8704ACPZ-REEL71 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 14-Lead Thin Shrink SOIC 14-Lead Thin Shrink SOIC 14-Lead Thin Shrink SOIC 14-Lead Thin Shrink SOIC 16-Terminal Leadless Frame Chip Scale 16-Terminal Leadless Frame Chip Scale Package Option RU-14 RU-14 RU-14 RU-14 CP-16 CP-16 1 Z = Pb-free part. Rev. 0 | Page 14 of 16 ADD8704 NOTES Rev. 0 | Page 15 of 16 ADD8704 NOTES (c) 2003 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C04417-0-10/03(0) Rev. 0 | Page 16 of 16 This datasheet has been download from: www..com Datasheets for electronics components. |
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