LMH6640

LMH6640 TFT-LCD Single, 16V Rail-to-Rail High Output Operational Amplifier November 2004 LMH6640 TFT-LCD Single, 16V Rail-to-Rail High Output Operational Amplifier General Description The LMH™6640 is a voltage feedback operational amplifier with a rail-to-rail output drive capability of 100 mA. Employing National’s patented VIP10 process, the LMH6640 delivers a bandwidth of 190 MHz at a current consumption of only 4mA. An input common mode voltage range extending to 0.3V below the V− and to within 0.9V of V+, makes the LMH6640 a true single supply op-amp. The output voltage range extends to within 100 mV of either supply rail providing the user with a dynamic range that is especially desirable in low voltage applications. The LMH6640 offers a slew rate of 170 V/µs resulting in a full power bandwidth of approximately 28 MHz with 5V single supply (2 VPP, −1 dB). Careful attention has been paid to ensure device stability under all operating voltages and modes. The result is a very well behaved frequency response characteristic for any gain setting including +1, and excellent specifications for driving video cables including total harmonic distortion of −64 dBc @ 5 MHz, differential gain of 0.12% and differential phase of 0.12˚. Features (VS = 16V, RL= 2 kΩ to V+/2, 25˚C, Typical Values Unless Specified) n Supply current (no load) 4 mA n Output resistance (closed loop 1 MHz) 0.35Ω n −3 dB BW (AV = 1) 190 MHz n Settling time ( ± 0.1%, 2 VPP) 35 ns n Input common mode voltage −0.3V to 15.1V n Output voltage swing 100 mV from rails ± 100 mA n Linear output current n Total harmonic distortion (2 VPP, 5 MHz) −64 dBc n Fully characterized for: 5V & 16V n No output phase reversal with CMVR exceeded n Differential gain (RL = 150Ω) 0.12% n Differential phase (RL = 150Ω) 0.12˚ Applications n n n n n n TFT panel VCOM buffer amplifier Active filters CD/DVD ROM ADC buffer amplifier Portable video Current sense buffer Typical Application 20086234 Typical Application as a TFT Panel VCOM Driver LMH™ is a trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200862 www.national.com LMH6640 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Human Body Model Machine Model VIN Differential Input Current Supply Voltages (V+ – V−) Voltage at Input/Output Pins Storage Temperature Range + − Junction Temperature (Note 4) Soldering Information Infrared or Convection (20 sec.) Wave Soldering (10 sec.) +150˚C 235˚C 260˚C 2 KV 200V Operating Ratings (Note 3) Supply Voltage (V+ – V−) Operating Temperature Range (Note 4) Package Thermal Resistance (Note 4) 5-Pin SOT23 265˚C/W 4.5V to 16V −40˚C to +85˚C ± 2.5V ± 10 mA 18V V +0.8V, V −0.8V −65˚C to +150˚C 5V Electrical Characteristics Unless otherwise specified, All limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VO = VCM = V+/2 and RL = 2 kΩ to V+/2. Boldface limits apply at temperature extremes. (Note 9) Symbol BW BW0.1 dB FPBW LSBW GBW SR en in THD ts VOS IB IOS CMVR Parameter −3 dB Bandwidth 0.1 dB Gain Flatness Full Power Bandwidth -3 dB Bandwidth Gain Bandwidth Product Slew Rate (Note 8) Input Referred Voltage Noise Input Referred Current Noise Total Harmonic Distortion Settling Time Input Offset Voltage Input Bias Current (Note 7) Input Offset Current Common Mode Input Voltage Range CMRR ≥ 50 dB 4.0 3.6 CMRR AVOL Common Mode Rejection Ratio Large Signal Voltage Gain V− ≤ VCM ≤ V+ −1.5V VO = 4 VPP, RL = 2 kΩ to V+/2 VO = 3.75 VPP, RL = 150Ω to V+/2 VO Output Swing High Output Swing Low RL = 2 kΩ to V+/2 RL = 150Ω to V+/2 RL = 2 kΩ to V /2 + Conditions AV = +1 (RL = 100Ω) AV = −1 (RL = 100Ω) AV = −3 AV = +1, VOUT = 2 VPP, −1 dB AV = +1, VO = 2 VPP (RL = 100Ω) AV = +1, (RL = 100Ω) AV = −1 f = 10 kHz f = 1 MHz f = 10 kHz f = 1 MHz f = 5 MHz, VO = 2 VPP, AV = +2 RL = 1 kΩ to V+/2 VO = 2 VPP, ± 0.1%, AV = −1 Min (Note 6) Typ (Note 5) 150 58 18 28 32 59 170 23 15 1.1 0.7 –65 35 1 −1.2 34 –0.3 4.1 90 95 78 4.94 4.80 0.06 0.20 Max (Note 6) Units MHz MHz MHz MHz MHz V/µs nV/ pA/ dBc ns 5 7 −2.6 −3.25 800 1400 –0.2 –0.1 mV µA nA V 72 86 82 74 70 4.90 4.75 dB dB 0.10 0.25 V RL = 150Ω to V+/2 www.national.com 2 LMH6640 5V Electrical Characteristics Symbol ISC Parameter Output Short Circuit Current (Note 3) (Continued) Unless otherwise specified, All limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VO = VCM = V+/2 and RL = 2 kΩ to V+/2. Boldface limits apply at temperature extremes. (Note 9) Conditions Sourcing to V+/2 Sinking from V+/2 IOUT PSRR IS RIN CIN ROUT DG DP Output Current Power Supply Rejection Ratio Supply Current Common Mode Input Resistance Common Mode Input Capacitance VO = 0.5V from either Supply 4V ≤ V ≤ 6V + Min (Note 6) 100 75 100 70 72 Typ (Note 5) 130 130 +75/−90 80 3.7 15 1.7 0.1 0.4 0.13 0.10 Max (Note 6) Units mA mA dB 5.5 8.0 mA No Load AV = +1, f = 1 kHz, RS = 1 MΩ AV = +1, RS = 100 kΩ MΩ pF Ω % deg Output Resistance Closed Loop RF = 10 kΩ, f = 1 kHz, AV = −1 RF = 10 kΩ, f = 1 MHz, AV = −1 Differential Gain Differential Phase NTSC, AV = +2 RL = 150Ω to V+/2 NTSC, AV = +2 RL = 150Ω to V+/2 16V Electrical Characteristics Unless otherwise specified, All limits guaranteed for TJ = 25˚C, V+ = 16V, V− = 0V, VO = VCM = V+/2 and RL = 2 kΩ to V+/2. Boldface limits apply at temperature extremes. (Note 9) Symbol BW BW0.1 dB LSBW GBW SR en in THD ts VOS IB IOS CMVR Parameter −3 dB Bandwidth 0.1 dB Gain Flatness -3 dB Bandwidth Gain Bandwidth Product Slew Rate (Note 8) Input Referred Voltage Noise Input Referred Current Noise Total Harmonic Distortion Settling Time Input Offset Voltage Input Bias Current (Note 7) Input Offset Current Common Mode Input Voltage Range CMRR ≥ 50 dB 15.0 14.6 CMRR Common Mode Rejection Ratio V− ≤ VCM ≤ V+ −1.5V 3 Conditions AV = +1 (RL = 100Ω) AV = −1 (RL = 100Ω) AV = −2.7 AV = +1, VO = 2 VPP (RL = 100Ω) AV = +1, (RL = 100Ω) AV = −1 f = 10 kHz f = 1 MHz f = 10 kHz f = 1 MHz f = 5 MHz, VO = 2 VPP, AV = +2 RL = 1 kΩ to V+/2 VO = 2 VPP, ± 0.1%, AV = −1 Min (Note 6) Typ (Note 5) 190 60 20 35 62 170 23 15 1.1 0.7 –64 35 1 −1 34 –0.3 15.1 90 Max (Note 6) Units MHz MHz MHz MHz V/µs nV/ pA/ dBc ns 5 7 −2.6 −3.5 800 1800 −0.2 −0.1 mV µA nA V 72 dB www.national.com LMH6640 16V Electrical Characteristics Symbol AVOL Parameter Large Signal Voltage Gain (Continued) Unless otherwise specified, All limits guaranteed for TJ = 25˚C, V+ = 16V, V− = 0V, VO = VCM = V+/2 and RL = 2 kΩ to V+/2. Boldface limits apply at temperature extremes. (Note 9) Conditions VO = 15 VPP, RL = 2 kΩ to V+/2 VO = 14 VPP, RL = 150Ω to V+/2 VO Output Swing High Output Swing Low ISC Output Short Circuit Current (Note 3) RL = 2 kΩ to V+/2 RL = 150Ω to V /2 + Min (Note 6) 86 82 74 70 15.85 15.45 Typ (Note 5) 95 78 15.90 15.78 0.10 0.21 Max (Note 6) Units dB RL = 2 kΩ to V+/2 RL = 150Ω to V+/2 Sourcing to V /2 Sinking from V+/2 + 0.15 0.55 V 60 30 50 15 72 95 75 mA IOUT PSRR IS RIN CIN ROUT DG DP Output Current Power Supply Rejection Ratio Supply Current Common Mode Input Resistance Common Mode Input Capacitance VO = 0.5V from either Supply 15V ≤ V+ ≤ 17V No Load AV = +1, f = 1 kHz, RS = 1 MΩ AV = +1, RS = 100 kΩ ± 100 80 4 32 1.7 0.1 0.3 0.12 0.12 6.5 7.8 mA dB mA MΩ pF Ω % deg Output Resistance Closed Loop RF = 10 kΩ, f = 1 kHz, AV = −1 RF = 10 kΩ, f = 1 MHz, AV = −1 Differential Gain Differential Phase NTSC, AV = +2 RL = 150Ω to V+/2 NTSC, AV = +2 RL = 150Ω to V+/2 Note 1: Absolute maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics. Note 2: Human body model, 1.5 kΩ in series with 100 pF. Machine Model, 0Ω in series with 200 pF. Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150 ˚C Short circuit test is a momentary test. Output short circuit duration is infinite for VS < 6V at room temperature and below. For VS > 6V, allowable short circuit duration is 1.5 ms. Note 4: The maximum power dissipation is a function of TJ(MAX), θJA , and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX)-TA ) / θJA. All numbers apply for packages soldered directly onto a PC board. Note 5: Typical Values represent the most likely parametric norm. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: Positive current corresponds to current flowing into the device. Note 8: Slew rate is the average of the rising and falling slew rates Note 9: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ > TA. www.national.com 4 LMH6640 Connection Diagram 5-Pin SOT23 20086223 Top View Ordering Information Package 5-Pin SOT23 Part Number LMH6640MF LMH6640MFX Package Marking AH1A Transport Media 1k Units Tape and Reel 3k Units Tape and Reel NSC Drawing MF05A 5 www.national.com LMH6640 Typical Performance Characteristics + At TJ = 25˚C, V+ = 16 V, V− = 0V, RF = 330Ω for AV= +2, RF = 1 kΩ for AV = −1. RL tied to V /2. Unless otherwise specified. IS vs. VS for Various Temperature IS vs. VCM for Various Temperature 20086221 20086220 IB vs. VS for Various Temperature IB vs. VS for Various Temperature 20086218 20086219 VOS vs. VS for Various Temperature (Typical Unit) IOS vs. VS for Various Temperature 20086216 20086227 www.national.com 6 LMH6640 Typical Performance Characteristics At TJ = 25˚C, V+ = 16 V, V− = 0V, RF = 330Ω for AV= +2, RF = 1 kΩ for AV = −1. RL tied to V+/2. Unless otherwise specified. (Continued) Positive Output Saturation Voltage vs. VS for Various Temperature Negative Output Saturation Voltage vs. VS for Various Temperature 20086224 20086228 Output Sinking Saturation Voltage vs. ISINKING for Various Temperature Output Sourcing Saturation Voltage vs. ISOURCING for Various Temperature 20086230 20086231 Input Current Noise vs. Frequency Input Voltage Noise vs. Frequency 20086204 20086205 7 www.national.com LMH6640 Typical Performance Characteristics At TJ = 25˚C, V+ = 16 V, V− = 0V, RF = 330Ω for AV= +2, RF = 1 kΩ for AV = −1. RL tied to V+/2. Unless otherwise specified. (Continued) Gain vs. Frequency Normalized (PIN= −30 dBm) Gain vs. Frequency Normalized (PIN=−30dBm) 20086206 20086207 Gain vs. Frequency for Various VS (PIN = −30 dBm) Gain vs. Frequency for Various VS (PIN = −30 dBm) 20086209 20086210 Open Loop Gain & Phase vs. Frequency for Various Temperature (PIN = −30 dBm) Relative Gain vs. Frequency for Various Temperature (PIN = −10 dBm) 20086233 20086232 www.national.com 8 LMH6640 Typical Performance Characteristics At TJ = 25˚C, V+ = 16 V, V− = 0V, RF = 330Ω for AV= +2, RF = 1 kΩ for AV = −1. RL tied to V+/2. Unless otherwise specified. (Continued) Large Signal Transition Large Signal Transition 20086213 20086214 Small Signal Pulse Response Small Signal Pulse Response 20086208 20086215 Large Signal Pulse Response Large Signal Pulse Response 20086211 20086212 9 www.national.com LMH6640 Typical Performance Characteristics At TJ = 25˚C, V+ = 16 V, V− = 0V, RF = 330Ω for AV= +2, RF = 1 kΩ for AV = −1. RL tied to V+/2. Unless otherwise specified. (Continued) PSRR vs. Frequency CMRR vs. Frequency 20086201 20086217 Closed Loop Output Resistance vs. Frequency Harmonic Distortion 20086203 20086226 0.1 dB Gain Flatness vs. Frequency Normalized Output Power vs. Input Power (AV = +1) 20086202 20086229 www.national.com 10 LMH6640 Typical Performance Characteristics At TJ = 25˚C, V+ = 16 V, V− = 0V, RF = 330Ω for AV= +2, RF = 1 kΩ for AV = −1. RL tied to V+/2. Unless otherwise specified. (Continued) Differential Gain/Phase vs. IRE 20086225 Application Notes With its high output current and speed, one of the major applications for the LMH6640 is the VCOM driver in a TFT panel. This application is a specially taxing one because of the demands it places on the operational amplifier’s output to drive a large amount of bi-directional current into a heavy capacitive load while operating under unity gain condition, which is a difficult challenge due to loop stability reasons. For a more detailed explanation of what a TFT panel is and what its amplifier requirements are, please see the Application Notes section of the LM6584 found on the web at: http://www.national.com/ds.cgi/LM/LM6584.pdf Because of the complexity of the TFT VCOM waveform and the wide variation in characteristics between different TFT panels, it is difficult to decipher the results of circuit testing in an actual panel. The ability to make simplifying assumptions about the load in order to test the amplifier on the bench allows testing using standard equipment and provides familiar results which could be interpreted using standard loop analysis techniques. This is what has been done in this application note with regard to the LMH6640’s performance when subjected to the conditions found in a TFT VCOM application. Figure 1, shows a typical simplified VCOM application with the LMH6640 buffering the VCOM potential (which is usually around 1⁄2 of panel supply voltage) and looking into the simplified model of the load. The load represents the cumulative effect of all stray capacitances between the VCOM node and both row and column lines. Associated with the capacitances shown, is the distributed resistance of the lines to each individual transistor switch. The other end of this R-C ladder is driven by the column driver in an actual panel and here is driven with a low impedance MOSFET driver (labeled “High Current Driver”) for the purposes of this bench test to simulate the effect that the column driver exerts on the VCOM load. The modeled TFT VCOM load, shown in Figure 1, is based on the following simplifying assumptions in order to allow for easy bench testing and yet allow good matching results obtained in the actual application: • The sum of all the capacitors and resistors in the R-C ladder is the total VCOM capacitance and resistance respectively. This total varies from panel to panel; capacitance could range from 50 nF-200 nF and the resistance could be anywhere from 20Ω-100Ω. • The number of ladder sections has been reduced to a number (4 sections in this case) which can easily be put together in the lab and which behaves reasonably close to the actual load. In this example, the LMH6640 was tested under the simulated conditions of total 209 nF capacitance and 54Ω as shown in Figure 1. 20086235 FIGURE 1. LMH6640 in a VCOM Buffer Application with Simulated TFT Load RS is sometimes used in the panel to provide additional isolation from the load while RF2 provides a more direct feedback from the VCOM. RF1, RF2, and RS are trimmed in the actual circuit with settling time and stability trade-offs considered and evaluated. When tested under simulated load conditions of Figure 1, here are the resultant voltage and current waveforms at the LMH6640 output: 11 www.national.com LMH6640 Application Notes (Continued) 20086236 FIGURE 2. VCOM Output, High Current Drive Waveform, & LMH6640 Output Current Waveforms 20086237 FIGURE 3. Expanded View of Figure 2 Waveforms showing LMH6640 Current Sinking 1⁄2 Cycle As can be seen, the LMH6640 is capable of supplying up to 160 mA of output current and can settle the output in 4.4 µs. The LMH6640 is a cost effective amplifier for use in the TFT VCOM application and is made even more attractive by its large supply voltage range and high output current. The combination of all these features is not readily available in the market, especially in the space saving SOT23-5 package. All this performance is achieved at the low power consumption of 65 mW which is of utmost importance in today’s battery driven TFT panels. www.national.com 12 LMH6640 TFT-LCD Single, 16V Rail-to-Rail High Output Operational Amplifier Physical Dimensions unless otherwise noted inches (millimeters) 5-Pin SOT23 NS Product Number MF05A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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