LM6132BIN

LM6132 Dual and LM6134 Quad, Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers April 2000 LM6132 Dual/LM6134 Quad Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers General Description The LM6132/34 provides new levels of speed vs power performance in applications where low voltage supplies or power limitations previously made compromise necessary. With only 360 µA/amp supply current, the 10 MHz gain-bandwidth of this device supports new portable applications where higher power devices unacceptably drain battery life. The LM6132/34 can be driven by voltages that exceed both power supply rails, thus eliminating concerns over exceeding the common-mode voltage range. The rail-to-rail output swing capability provides the maximum possible dynamic range at the output. This is particularly important when operating on low supply voltages. The LM6132/34 can also drive large capacitive loads without oscillating. Operating on supplies from 2.7V to over 24V, the LM6132/34 is excellent for a very wide range of applications, from battery operated systems with large bandwidth requirements to high speed instrumentation. Features (For 5V Supply, Typ Unless Noted) n Rail-to-Rail input CMVR −0.25V to 5.25V n Rail-to-Rail output swing 0.01V to 4.99V n High gain-bandwidth, 10 MHz at 20 kHz n Slew rate 12 V/µs n Low supply current 360 µA/Amp n Wide supply range 2.7V to over 24V n CMRR 100 dB n Gain 100 dB with RL = 10k n PSRR 82 dB Applications n n n n n Battery operated instrumentation Instrumentation Amplifiers Portable scanners Wireless communications Flat panel display driver Connection Diagrams 8-Pin DIP/SO 14-Pin DIP/SO DS012349-1 Top View DS012349-2 Top View Ordering Information Package 8-Pin Molded DIP 8-Pin Small Outline 14-Pin Molded DIP 14-Pin Small Outline Temperature Range Industrial, −40˚C to +85˚C LM6132AIN, LM6132BIN LM6132AIM, LM6132BIM LM6132AIMX, LM6132BIMX LM6134AIN, LM6134BIN LM6134AIM, LM6134BIM LM6134AIMX, LM6134BIMX NSC Drawing N08E M08A M08A N14A M14A M14A Rails Rails Tape and Reel Rails Rails Tape and Reel Transport Media © 2000 National Semiconductor Corporation DS012349 www.national.com LM6132/LM6134 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) Differential Input Voltage Voltage at Input/Output Pin Supply Voltage (V+–V−) Current at Input Pin Current at Output Pin (Note 3) Current at Power Supply Pin Lead Temp. (soldering, 10 sec.) Storage Temperature Range 2500V 15V (V+)+0.3V, (V−)−0.3V 35V ± 10 mA ± 25 mA 50 mA 260˚C −65˚C to +150˚C Junction Temperature (Note 4) 150˚C Operating Ratings(Note 1) Supply Voltage Junction Temperature Range LM6132, LM6134 Thermal resistance (θJA) N Package, 8-pin Molded DIP M Package, 8-pin Surface Mount N Package, 14-pin Molded DIP M Package, 14-pin Surface Mount 1.8V ≤ VS ≤ 24V −40˚C ≤ TJ ≤ +85˚C 115˚C/W 193˚C/W 81˚C/W 126˚C/W 5.0V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5.0V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to VS/2. Boldface limits apply at the temperature extremes LM6134AI Symbol Parameter Conditions Typ (Note 5) 0.25 5 0V ≤ VCM ≤ 5V 110 3.4 104 0V ≤ VCM ≤ 4V 0V ≤ VCM ≤ 5V PSRR VCM AV VO Power Supply Rejection Ratio Input Common-Mode Voltage Range Large Signal Voltage Gain Output Swing RL = 10k 100k Load 100 80 82 −0.25 5.25 100 4.992 0.007 10k Load 4.952 0.032 5k Load 4.923 0.051 ISC Output Short Circuit Current LM6132 Sourcing Sinking 4 3.5 75 70 60 55 78 75 0 5.0 25 8 4.98 4.93 0.017 0.019 4.94 4.85 0.07 0.09 4.90 4.85 0.095 0.12 2 2 1.8 1.8 75 70 60 55 78 75 0 5.0 15 6 4.98 4.93 0.017 0.019 4.94 4.85 0.07 0.09 4.90 4.85 0.095 0.12 2 1 1.8 1 140 300 30 50 180 350 30 50 LM6132AI Limit (Note 6) VOS TCVOS IB IOS RIN CMRR Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance, CM Common Mode Rejection Ratio 2 4 LM6134BI LM6132BI Limit (Note 6) 6 8 mV max µV/C nA max nA max MΩ dB min dB min V V/mV min V min V max V min V max V min V max mA min mA min Units ± 2.5V ≤ VS ≤ ± 12V www.national.com 2 LM6132/LM6134 5.0V DC Electrical Characteristics (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5.0V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to VS/2. Boldface limits apply at the temperature extremes LM6134AI Symbol Parameter Conditions Typ (Note 5) 3 3.5 LM6132AI Limit (Note 6) ISC Output Short Circuit Current LM6134 Sourcing Sinking IS Supply Current Per Amplifier 2 1.6 1.8 1.3 400 450 LM6134BI LM6132BI Limit (Note 6) 2 1 1.8 1 400 450 mA min mA min µA max Units 360 5.0V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5.0V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to VS/2. Boldface limits apply at the temperature extremes LM6134AI Symbol Parameter Conditions Typ (Note 5) 14 10 33 10 27 LM6132AI Limit (Note 6) SR GBW θm Gm en Slew Rate Gain-Bandwidth Product Phase Margin Gain Margin Input Referred Voltage Noise 8 7 7.4 7 RL = 10k RL = 10k f = 1 kHz LM6134BI LM6132BI Limit (Note 6) 8 7 7.4 7 V/µs min MHz min deg dB Units ± 4V @ VS = ± 6V RS < 1 kΩ f = 20 kHz in Input Referred Current Noise f = 1 kHz 0.18 3 www.national.com LM6132/LM6134 2.7V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to VS/2. Boldface limits apply at the temperature extreme LM6134AI Symbol Parameter Conditions Typ (Note 5) 0.12 0V ≤ VCM ≤ 2.7V 90 2.8 134 0V ≤ VCM ≤ 2.7V 82 80 2.7 0 RL = 10k RL = 100k 100 0.03 2.66 IS Supply Current Per Amplifier 330 0.08 0.112 2.65 2.25 0.08 0.112 2.65 2.25 2.7 0 V/mV V max V min µA LM6132AI Limit (Note 6) VOS IB IOS RIN CMRR PSRR VCM AV VO Input Offset Voltage Input Bias Current Input Offset Current Input Resistance Common Mode Rejection Ratio Power Supply Rejection Ratio Input Common-Mode Voltage Range Large Signal Voltage Gain Output Swing V 2 8 LM6134BI LM6132BI Limit (Note 6) 6 12 mV max nA nA MΩ dB dB Units ± 1.35V ≤ VS ≤ ± 12V 2.7V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to VS/2. LM6134AI Symbol Parameter Conditions Typ (Note 5) 7 23 12 LM6132AI Limit (Note 6) GBW θm Gm Gain-Bandwidth Product Phase Margin Gain Margin RL = 10k, f = 20 kHz RL = 10k LM6134BI LM6132BI Limit (Note 6) MHz deg dB Units www.national.com 4 LM6132/LM6134 24V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 24V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to VS/2. Boldface limits apply at the temperature extreme LM6134AI Symbol Parameter Conditions Typ (Note 5) 1.7 0V ≤ VCM ≤ 24V 125 4.8 210 0V ≤ VCM ≤ 24V 2.7V ≤ VS ≤ 24V 80 82 −0.25 24.25 RL = 10k RL = 10k 102 0.075 23.86 IS Supply Current Per Amplifier 390 0.15 23.8 450 490 0.15 23.8 450 490 0 24 0 24 LM6132AI Limit (Note 6) VOS IB IOS RIN CMRR PSRR VCM AV VO Input Offset Voltage Input Bias Current Input Offset Current Input Resistance Common Mode Rejection Ratio Power Supply Rejection Ratio Input Common-Mode Voltage Range Large Signal Voltage Gain Output Swing V max V min µA max V min V max V/mV dB 3 5 LM6134BI LM6132BI Limit (Note 6) 7 9 mV max nA nA MΩ dB Units 24V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 24V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to VS/2. LM6134AI Symbol Parameter Conditions Typ (Note 5) 11 23 12 0.0015 LM6132AI Limit (Note 6) GBW θm Gm THD + N Gain-Bandwidth Product Phase Margin Gain Margin Total Harmonic Distortion and Noise RL = 10k, f = 20 kHz RL = 10k RL = 10k AV = +1, VO = 20VP-P f = 10 kHz LM6134BI LM6132BI Limit (Note 6) MHz deg dB % Units 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. 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. 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 into a PC board. Note 5: Typical Values represent the most likely parametric norm. Note 6: All limits are guaranteed by testing or statistical analysis. 5 www.national.com LM6132/LM6134 Typical Performance Characteristics Supply Current vs Supply Voltage TA = 25˚C, RL = 10 kΩ unless otherwise specified dVOS vs VCM Offset Voltage vs Supply Voltage DS012349-6 DS012349-3 DS012349-5 dVOS vs VCM dVOS vs VCM Ibias vs VCM DS012349-7 DS012349-8 DS012349-9 Ibias vs VCM Ibias vs VCM Input Bias Current vs Supply Voltage DS012349-10 DS012349-11 DS012349-12 Neg PSRR vs Frequency Pos PSSR vs Frequency dVOS vs Output Voltage DS012349-13 DS012349-14 DS012349-15 www.national.com 6 LM6132/LM6134 Typical Performance Characteristics dVOS vs Output Voltage dVOS vs Output Voltage TA = 25˚C, RL = 10 kΩ unless otherwise specified (Continued) CMRR vs Frequency DS012349-18 DS012349-16 DS012349-17 Output Voltage vs Sinking Current Output Voltage vs Sinking Current Output Voltage vs Sinking Current DS012349-19 DS012349-20 DS012349-21 Output Voltage vs Sourcing Current Output Voltage vs Sourcing Current Output Voltage vs Sourcing Current DS012349-22 DS012349-23 DS012349-24 7 www.national.com LM6132/LM6134 Typical Performance Characteristics Noise Voltage vs Frequency TA = 25˚C, RL = 10 kΩ unless otherwise specified (Continued) NF vs Source Resistance Noise Current vs Frequency DS012349-39 DS012349-25 DS012349-38 Gain and Phase vs Frequency Gain and Phase vs Frequency Gain and Phase vs Frequency DS012349-28 DS012349-29 DS012349-30 GBW vs Supply Voltage at 20 kHz DS012349-31 LM6132/34 Application Hints The LM6132 brings a new level of ease of use to opamp system design. With greater than rail-to-rail input voltage range concern over exceeding the common-mode voltage range is eliminated. Rail-to-rail output swing provides the maximum possible dynamic range at the output. This is particularly important when operating on low supply voltages. The high gain-bandwidth with low supply current opens new battery powered applications, where high power consumption, previously reduced battery life to unacceptable levels. To take advantage of these features, some ideas should be kept in mind. ENHANCED SLEW RATE Unlike most bipolar opamps, the unique phase reversal prevention/speed-up circuit in the input stage eliminates phase reversal and allows the slew rate to be very much a function of the input signal amplitude. Figure 2 shows how excess input signal is routed around the input collector-base junctions directly to the current mirrors. The LM6132/34 input stage converts the input voltage change to a current change. This current change drives the current mirrors through the collectors of Q1–Q2, Q3–Q4 when the input levels are normal. 8 www.national.com LM6132/LM6134 LM6132/34 Application Hints (Continued) If the input signal exceeds the slew rate of the input stage and the differential input voltage rises above a diode drop, the excess signal bypasses the normal input transistors, (Q1–Q4), and is routed in correct phase through the two additional transistors, (Q5, Q6), directly into the current mirrors. This rerouting of excess signal allows the slew-rate to increase by a factor of 10 to 1 or more. (See Figure 1.) As the overdrive increases, the opamp reacts better than a conventional opamp. Large fast pulses will raise the slewrate to around 25V to 30V/µs. Slew Rate vs Differential VIN VS = ± 12V DS012349-40 FIGURE 1. This effect is most noticeable at higher supply voltages and lower gains where incoming signals are likely to be large. This speed-up action adds stability to the system when driving large capacitive loads. DRIVING CAPACITIVE LOADS Capacitive loads decrease the phase margin of all opamps. This is caused by the output resistance of the amplifier and the load capacitance forming an R-C phase lag network. This can lead to overshoot, ringing and oscillation. Slew rate limiting can also cause additional lag. Most opamps with a fixed maximum slew-rate will lag further and further behind when driving capacitive loads even though the differential input voltage raises. With the LM6132, the lag causes the slew rate to raise. The increased slew-rate keeps the output following the input much better. This effectively reduces phase lag. After the output has caught up with the input, the differential input voltage drops down and the amplifier settles rapidly. DS012349-36 FIGURE 2. These features allow the LM6132 to drive capacitive loads as large as 500 pF at unity gain and not oscillate. The scope photos (Figure 3 and Figure 4) above show the LM6132 driv9 ing a 500 pF load. In Figure 3 , the lower trace is with no capacitive load and the upper trace is with a 500 pF load. Here we are operating on ± 12V supplies with a 20 Vp-p pulse. Exwww.national.com LM6132/LM6134 LM6132/34 Application Hints (Continued) cellent response is obtained with a Cf of 39 pF. In Figure 4, the supplies have been reduced to ± 2.5V, the pulse is 4 Vp-p and Cf is 39 pF. The best value for the compensation capacitor should be established after the board layout is finished because the value is dependent on board stray capacity, the value of the feedback resistor, the closed loop gain and, to some extent, the supply voltage. Another effect that is common to all opamps is the phase shift caused by the feedback resistor and the input capacitance. This phase shift also reduces phase margin. This effect is taken care of at the same time as the effect of the capacitive load when the capacitor is placed across the feedback resistor. The circuit shown in Figure 5 was used for these scope photos. DS012349-43 FIGURE 5. Figure 6 shows a method for compensating for load capacitance (Co) effects by adding both an isolation resistor Ro at the output and a feedback capacitor CFdirectly between the output and the inverting input pin. Feedback capacitor CF compensates for the pole introduced by Ro and Co, minimizing ringing in the output waveform while the feedback resistor RF compensates for dc inaccuracies introduced by Ro. Depending on the size of the load capacitance, the value of Rois typically chosen to be between 100Ω to 1 kΩ. DS012349-45 DS012349-37 FIGURE 3. FIGURE 6. Typical Applications 3 OPAMP INSTRUMENTATION AMP WITH RAIL-TO-RAIL INPUT AND OUTPUT Using the LM6134, a 3 opamp instrumentation amplifier with rail-to-rail inputs and rail to rail output can be made. These features make these instrumentation amplifiers ideal for single supply systems. Some manufacturers use a precision voltage divider array of 5 resistors to divide the common-mode voltage to get an input range of rail-to-rail or greater. The problem with this method is that it also divides the signal, so to even get unity gain, the amplifier must be run at high closed loop gains. This raises the noise and drift by the internal gain factor and lowers the input impedance. Any mismatch in these precision resistors reduces the CMR as well. Using the LM6134, all of these problems are eliminated. In this example, amplifiers A and B act as buffers to the differential stage (Figure 7). These buffers assure that the input impedance is over 100 MΩ and they eliminate the requirement for precision matched resistors in the input stage. They also assure that the difference amp is driven from a voltage source. This is necessary to maintain the CMR set by the matching of R1–R2 with R3–R4. DS012349-42 FIGURE 4. www.national.com 10 LM6132/LM6134 Typical Applications (Continued) DS012349-44 FIGURE 7. FLAT PANEL DISPLAY BUFFERING Three features of the LM6132/34 make it a superb choice for TFT LCD applications. First, its low current draw (360 µA per amplifier @ 5V) makes it an ideal choice for battery powered applications such as in laptop computers. Second, since the device operates down to 2.7V, it is a natural choice for next generation 3V TFT panels. Last, but not least, the large capacitive drive capability of the LM6132 comes in very handy in driving highly capacitive loads that are characteristic of LCD display drivers. The large capacitive drive capability of the LM6132/34 allows it to be used as buffers for the gamma correction reference voltage inputs of resistor-DAC type column (Source) drivers in TFT LCD panels. This amplifier is also useful for buffering only the center reference voltage input of Capacitor-DAC type column (Source) drivers such as the LMC750X series. Since for VGA and SVGA displays, the buffered voltages must settle within approximately 4 µs, the well known technique of using a small isolation resistor in series with the amplifier’s output very effectively dampens the ringing at the output. With its wide supply voltage range of 2.7V to 24V), the LM6132/34 can be used for a diverse range of applications. The system designer is thus able to choose a single device type that serves many sub-circuits in the system, eliminating the need to specify multiple devices in the bill of materials. Along with its sister parts, the LM6142 and LM6152 that have the same wide supply voltage capability, choice of the LM6132 in a design eliminates the need to search for multiple sources for new designs. 11 www.national.com LM6132/LM6134 Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC Order Number LM6132AIM, LM6132BIM, LM6132AIMX or LM6132BIMX NS Package Number M08A 14-Lead (0.300" Wide) Molded Small Outline Package, JEDEC Order Number LM6134AIM, LM6134BIM, LM6134AIMX or LM6134BIMX NS Package Number M14A www.national.com 12 LM6132/LM6134 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Lead (0.300" Wide) Molded Dual-In-Line Package Order Number LM6132AIN, LM6132BIN NS Package Number N08E 14-Lead (0.300" Wide) Molded Dual-In-Line Package Order Number LM6134AIN, LM6134BIN NS Package Number N14A 13 www.national.com LM6132 Dual and LM6134 Quad, Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers Notes 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. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 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.