LM6142 Dual and LM6144 Quad High Speed/Low Power 17 MHz Rail-to-Rail Input-Output Operational Amplifiers General Description Features At VS e 5V. Typ unless noted. Using patent pending new circuit topologies, the LM6142/44 provides new levels of performance in applications where low voltage supplies or power limitations previously made compromise necessary. Operating on supplies of 1.8V to over 24V, the LM6142/44 is an excellent choice for battery operated systems, portable instrumentation and others. The greater than rail-to-rail input voltage range eliminates concern over exceeding the common-mode voltage range. The rail-to-rail output swing provides the maximum possible dynamic range at the output. This is particularly important when operating on low supply voltages. High gain-bandwidth with 650 mA/Amplifier supply current opens new battery powered applications where previous higher power consumption reduced battery life to unacceptable levels. The ability to drive large capacitive loads without oscillating functionally removes this common problem. Y Y Y Y Y Y Y Y Y Rail-to-rail input CMVR b0.25V to 5.25V Rail-to-rail output swing 0.005V to 4.995V Wide gain-bandwidth: 17 MHz at 50 kHz (typ) Slew rate: Small signal, 5V/ms Large signal, 30V/ms Low supply current 650 mA/Amplifier Wide supply range 1.8V to 24V CMRR 107 dB Gain 108 dB with RL e 10k PSRR 87 dB Applications Y Y Y Y Y Battery operated instrumentation Depth sounders/fish finders Barcode scanners Wireless communications Rail-to-rail in-out instrumentation amps Connection Diagrams 8-Pin DIP/SO 8-Pin CDIP TL/H/12057-14 Top View 14-Pin DIP/SO TL/H/12057 - 1 Top View TL/H/12057 - 2 Top View Ordering Information Package Temperature Range Temperature Range Industrial b 40 C to a 85 C Military b 55 C to a 125 C NSC Drawing 8-Pin Molded DIP LM6142AIN, LM6142BIN N08E 8-Pin Small Outline LM6142AIM, LM6142BIM M08A 14-Pin Molded DIP LM6144AIN, LM6144BIN N14A 14-Pin Small Outline LM6144AIM, LM6144BIM M14A 8-Pin CDIP C1995 National Semiconductor Corporation LM6142AMJ/883 TL/H/12057 D08C RRD-B30M75/Printed in U. S. A. LM6142 Dual and LM6144 Quad High Speed/Low Power 17 MHz Rail-to-Rail Input-Output Operational Amplifiers March 1995 Absolute Maximum Ratings (Note 1) Operating Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage Junction Temperature Range LM6142, LM6144 ESD Tolerance (Note 2) Differential Input Voltage Voltage at Input/Output Pin 2500V 15V Thermal Resistance (iJA) N Package, 8-Pin Molded DIP M Package, 8-Pin Surface Mount N Package, 14-Pin Molded DIP M Package, 14-Pin Surface Mount Junction Temperature (Note 4) 150 C a b (V ) a 0.3V, (V ) b 0.3V a b Supply Voltage (V b V ) 35V g 10 mA Current at Input Pin g 25 mA Current at Output Pin (Note 3) Current at Power Supply Pin 50 mA Lead Temperature (soldering, 10 sec) 260 C b 65 C to a 150 C Storage Temp. Range 5.0V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ e 25 C, V V a /2. Boldface limits apply at the temperature extremes. Symbol Parameter a VOS Input Offset Voltage 0.3 TCVOS Input Offset Voltage Average Drift 3 IB Input Bias Current 0V s VCM s 5V IOS Input Offset Current RIN Input Resistance, CM CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio VCM Input Common-Mode Voltage Range a s 24V b 40 C s TJ s a 85 C 115 C/W 193 C/W 81 C/W 126 C/W e 5.0V, V b e 0V, VCM e VO e V a /2 and RL l 1 MX to Typ (Note 5) Conditions 1.8V s V LM6144AI LM6142AI Limit (Note 6) LM6144BI LM6142BI Limit (Note 6) Units 1.0 2.2 2.5 3.3 mV max mV/ C 170 250 300 180 280 526 526 3 30 80 30 80 126 nA max nA max MX 0V s VCM s 4V 107 84 78 84 78 0V s VCM s 5V 82 79 66 64 66 64 5V s V a s 24V 87 80 78 80 78 b 0.25 0 0 5.25 5.0 5.0 dB min V AV Large Signal Voltage Gain RL e 10k 270 70 100 33 80 25 V/mV min VO Output Swing RL e 100k 0.005 0.01 0.013 0.01 0.013 V max 4.995 4.98 4.93 4.98 4.93 V min RL e 10k RL e 2k 2 0.02 V max 4.97 V min 0.06 0.1 0.133 0.1 0.133 V max 4.90 4.86 4.80 4.86 4.80 V min 5.0V DC Electrical Characteristics a Unless Otherwise Specified, All Limits Guaranteed for TJ e 25 C, V e 5.0V, V to V a /2. Boldface limits apply at the temperature extremes. (Continued) Symbol ISC Parameter Output Short Circuit Current LM6142 Typ (Note 5) Conditions Sourcing Output Short Circuit Current LM6144 Supply Current Sourcing Units 10 4.9 8 4 mA min 35 35 mA max 10 5.3 10 5.3 mA min 35 35 mA max 6 3 6 3 mA min 35 35 mA max 8 4 8 4 mA min 35 35 mA max 800 880 800 880 mA max 22 Per Amplifier 650 Unless Otherwise Specified, All Limits Guaranteed for TJ e 25 C, V to VS/2. Boldface limits apply at the temperature extremes. Parameter LM6144BI LM6142BI Limit (Note 6) 8 5.0V AC Electrical Characteristics Symbol LM6144AI LM6142AI Limit (Note 6) 24 Sinking IS e 0V, VCM e VO e V a /2 and RL l 1 MX 13 Sinking ISC b a Conditions e 5.0V, V b e 0V, VCM e VO e V a /2 and RL l 1 MX Typ (Note 5) LM6144AI LM6142AI Limit (Note 6) LM6144BI LM6142BI Limit (Note 6) Units SR Slew Rate 8 Vp-p @ VCC 12V RS l 1 kX 25 15 13 13 11 V/ms min GBW Gain-Bandwidth Product f e 50 kHz 17 10 6 10 6 MHz min wm Phase Margin Amp-to-Amp Isolation en in T.H.D. Input-Referred Voltage Noise f e 1 kHz Input-Referred Current Noise f e 1 kHz Total Harmonic Distortion f e 10 kHz, RL e 10 kX, 38 Deg 130 dB 16 0.22 3 0.003 nV 0 Hz pA 0 Hz % 2.7V DC Electrical Characteristics Unless Otherwise Specified, All Limits Guaranteed for TJ e 25 C, V to V a /2. Boldface limits apply at the temperature extreme Symbol Parameter a e 2.7V, V b e 0V, VCM e VO e V a /2 and RL l 1 MX Typ (Note 5) Conditions LM6144AI LM6142AI Limit (Note 6) LM6144BI LM6142BI Limit (Note 6) Units VOS Input Offset Voltage 0.4 1.8 4.3 2.5 4.3 mV max IB Input Bias Current 150 250 526 300 526 nA max IOS Input Offset Current 4 30 80 30 80 nA max RIN Input Resistance CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio VCM Input Common-Mode Voltage Range 128 0V s VCM s 1.8V 90 0V s VCM s 2.7V 76 3V s V a s AV Large Signal Voltage Gain RL e 10k VO Output Swing RL e 10 kX IS Supply Current 5V dB min 79 b 0.25 0 0 V min 2.95 2.7 2.7 V max V/mV min 55 Per Amplifier 2.7V AC Electrical Characteristics Unless Otherwise Specified, All Limits Guaranteed for TJ e 25 C, V to V a /2. Boldface limits apply at the temperature extreme Symbol MX a 0.019 0.08 0.112 0.08 0.112 V max 2.67 2.66 2.25 2.66 2.25 V min 510 800 880 800 880 mA max e 2.7V, V b e 0V, VCM e VO e V a /2 and RL l 1 MX Typ (Note 5) LM6144AI LM6142AI Limit (Note 6) LM6144BI LM6142BI Limit (Note 6) Parameter Conditions GBW Gain-Bandwidth Product f e 50 kHz 9 MHz wm Phase Margin 36 Deg Gm Gain Margin 6 dB 4 Units 24V Electrical Characteristics Unless Otherwise Specified, All Limits Guaranteed for TJ e 25 C, V to VS/2. Boldface limits apply at the temperature extreme Symbol Parameter VOS Input Offset Voltage IB Input Bias Current IOS Input Offset Current RIN Input Resistance CMRR a e 24V, V b e 0V, VCM e VO e V a /2 and RL l 1 MX Typ (Note 5) Conditions 1.3 LM6144AI LM6142AI Limit (Note 6) LM6144BI LM6142BI Limit (Note 6) Units 2 4.8 3.8 4.8 mV max 174 nA max 5 nA max 288 MX Common Mode Rejection Ratio 0V s VCM s 23V 114 0V s VCM s 24V 100 PSRR Power Supply Rejection Ratio 0V s VCM s 24V 87 VCM Input Common-Mode Voltage Range dB min b 0.25 0 0 V min 24.25 24 24 V max AV Large Signal Voltage Gain RL e 10k 500 VO Output Swing RL e 10 kX 0.07 0.15 0.185 0.15 0.185 V max 23.85 23.81 23.62 23.81 23.62 V min 1100 1150 1100 1150 mA max IS Supply Current Per Amplifier 750 GBW Gain-Bandwidth Product f e 50 kHz 18 V/mV min MHz 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 Charactenstics. Note 2: Human body model, 1.5 kX 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), iJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD e (Tj(max) b TA)/iJA. 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. Note 7: For guaranteed military specifications see military datasheet MNLM6142AM-X. 5 Typical Performance Characteristics TA e 25 C, RL e 10 kX Unless Otherwise Specified Supply Current vs Supply Voltage Offset Voltage vs Supply Voltage Bias Current vs Supply Voltage Offset Voltage vs VCM Offset Voltage vs VCM Offset Voltage vs VCM Bias Current vs VCM Bias Current vs VCM Bias Current vs VCM Open-Loop Transfer Function Open-Loop Transfer Function Open-Loop Transfer Function TL/H/12057 - 3 6 Typical Performance Characteristics TA e 25 C, RL e 10 kX Unless Otherwise Specified (Continued) Output Voltage vs Source Current Output Voltage vs Source Current Output Voltage vs Source Current Output Voltage vs Sink Current Output Voltage vs Sink Current Output Voltage vs Sink Current Gain and Phase vs Load Distortion a Noise vs Frequency TL/H/12057 - 4 Gain and Phase vs Load GBW vs Supply TL/H/12057 - 11 7 Typical Performance Characteristics TA e 25 C, RL e 10 kX Unless Otherwise Specified (Continued) Open Loop Gain vs Load, 3V Supply Open Loop Gain vs Load, 5V Supply Open Loop Gain vs Load, 24V Supply Unity Gain Freq vs VS CMRR vs Frequency Crosstalk vs Frequency PSRR vs Frequency Noise Voltage vs Frequency Noise Current vs Frequency TL/H/12057 - 5 NE vs R Source TL/H/12057 - 12 8 LM6142/44 Application Ideas Slew Rate vs D VIN VS e g 5V The LM6142 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 causes the slew rate to be very much a function of the input signal amplitude. TL/H/12057 - 7 FIGURE 2 This effect is most noticeable at higher supply voltages and lower gains where incoming signals are likely to be large. This new input circuit also eliminates the phase reversal seen in many opamps when they are overdriven. This speed-up action adds stability to the system when driving large capacitive loads. Figure 1 shows how excess input signal, is routed around the input collector-base junctions, directly to the current mirrors. The LM6142/44 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. If the input signal exceeds the slew rate of the input stage, the differential input voltage rises above two diode drops. This 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 2 .) As the overdrive increases, the opamp reacts better than a conventional opamp. Large fast pulses will raise the slewrate to around 30V to 60V/ms. 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 LM6142, 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. TL/H/12057 - 6 FIGURE 1 9 LM6142/44 Application Ideas (Continued) These features allow the LM6142 to drive capacitive loads as large as 1000 pF at unity gain and not oscillate. The scope photos (Figure 3a and 3b ) above show the LM6142 driving a l000 pF load. In Figure 3a , the upper trace is with no capacitive load and the lower trace is with a 1000 pF load. Here we are operating on g 12V supplies with a 20 Vp-p pulse. Excellent response is obtained with a Cf of l0 pF. In Figure 3b , the supplies have been reduced to g 2.5V, the pulse is 4 Vp-p and Cf is 39 pF. The best value for the compensation capacitor is best 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 4 was used for these scope photos. TL/H/12057 - 10 FIGURE 4 Typical Applications FISH FINDER/ DEPTH SOUNDER. The LM6142/44 is an excellent choice for battery operated fish finders. The low supply current, high gain-bandwidth and full rail to rail output swing of the LM6142 provides an ideal combination for use in this and similar applications. ANALOG TO DIGITAL CONVERTER BUFFER The high capacitive load driving ability, rail-to-rail input and output range with the excellent CMR of 82 dB, make the LM6142/44 a good choice for buffering the inputs of A to D converters. 3 OPAMP INSTRUMENTATION AMP WITH RAIL-TORAIL INPUT AND OUTPUT Using the LM6144, 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 LM6144, all of these problems are eliminated. In this example, amplifiers A and B act as buffers to the differential stage (Figure 5). These buffers assure that the input impedance is over 100 MX 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. TL/H/12057-8 FIGURE 3a TL/H/12057-9 FIGURE 3b TL/H/12057 - 13 FIGURE 5 10 past the supplies so the combined common mode voltage plus the signal should not be greater than the supplies or limiting will occur. The gain is set by the ratio of R2/R1 and R3 should equal R1 and R4 equal R2. Making R4 slightly smaller than R2 and adding a trim pot equal to twice the difference between R2 and R4 will allow the CMR to be adjusted for optimum. SPICE MACROMODEL With both rail to rail input and output ranges, the inputs and outputs are only limited by the supply voltages. Remember that even with rail-to-rail output, the output can not swing A SPICE macromodel of this and many other National Semiconductor opamps is available at no charge from the NSC Customer Response Group at 800-272-9959. 11 Physical Dimensions inches (millimeters) 8-Pin Ceramic Sidebrazed Dual-In-Line Package Order Number LM6142AMJ/883 NS Package Number D08C 8-Pin Small Outline Package Order Number LM6142AIM or LM6142BIM NS Package Number M08A 12 Physical Dimensions inches (millimeters) (Continued) 14-Pin Small Outline Package Order Number LM6144AIM or LM6144BIM NS Package Number M14A 8-Pin Molded Dual-In-Line Package Order Number LM6142AIN or LM6142BIN NS Package Number N08E 13 LM6142 Dual and LM6144 Quad High Speed/Low Power 17 MHz Rail-to-Rail Input-Output Operational Amplifiers Physical Dimensions inches (millimeters) (Continued) 14-Pin Molded Dual-In-Line Package Order Number LM6144AIN or LM6144BIN NS Package Number N14A 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 OF NATIONAL SEMICONDUCTOR CORPORATION. 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