LM6142BIN

National Semiconductor is now part of Texas Instruments. Search http://www.ti.com/ for the latest technical information and details on our current products and services. LM6142/LM6144 17 MHz Rail-to-Rail Input-Output Operational Amplifiers General Description Features Using patent pending new circuit topologies, the LM6142/ LM6144 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/LM6144 is an excellent choice for battery operated systems, portable instrumentation and others. At VS = 5V. Typ unless noted. n Rail-to-rail input CMVR −0.25V to 5.25V n Rail-to-rail output swing 0.005V to 4.995V n Wide gain-bandwidth: 17MHz at 50kHz (typ) n Slew rate: Small signal, 5V/µs Large signal, 30V/µs n Low supply current 650µA/Amplifier n Wide supply range 1.8V to 24V n CMRR 107dB n Gain 108dB with RL = 10k n PSRR 87dB 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 650µA/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. Applications n n n n n Battery operated instrumentation Depth sounders/fish finders Barcode scanners Wireless communications Rail-to-rail in-out instrumentation amps Connection Diagrams 8-Pin CDIP 8-Pin DIP/SO 01205714 01205701 Top View Top View 14-Pin DIP/SO 01205702 Top View © 2004 National Semiconductor Corporation DS012057 www.national.com LM6142/LM6144, 17 MHz Rail-to-Rail Input-Output Operational Amplifiers November 2004 LM6142/LM6144 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. ESD Tolerance (Note 2) 2500V Differential Input Voltage 15V Voltage at Input/Output Pin Temperature Range Thermal Resistance (θJA) N Package, 8-Pin Molded DIP 35V ± 10mA ± 25mA Current at Input Pin Current at Output Pin (Note 3) Current at Power Supply Pin 50mA Lead Temperature (soldering, 10 sec) Storage Temp. Range −40˚C ≤ TA ≤ +85˚C LM6142, LM6144 (V+) + 0.3V, (V−) − 0.3V Supply Voltage (V+ − V−) 1.8V ≤ V+ ≤ 24V Supply Voltage 115˚C/W M Package, 8-Pin Surface Mount 193˚C/W N Package, 14-Pin Molded DIP 81˚C/W M Package, 14-Pin Surface Mount 126˚C/W 260˚C −65˚C to +150˚C Junction Temperature (Note 4) 150˚C 5.0V DC Electrical Characteristics (Note 8) Unless otherwise specified, all limits guaranteed for TA = 25˚C, V+ = 5.0V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to V+/2. Boldface limits apply at the temperature extremes. Symbol VOS TCVOS Parameter Conditions Input Offset Voltage LM6144AI LM6144BI Typ LM6142AI LM6142BI (Note 5) Limit Limit (Note 6) (Note 6) 1.0 2.5 mV 2.2 3.3 max 0.3 Input Offset Voltage 3 Units µV/˚C Average Drift IB Input Bias Current 0V ≤ VCM ≤ 5V IOS Input Offset Current RIN Input Resistance, CM CMRR Common Mode 170 250 180 280 3 Power Supply AV nA 80 max 84 84 MΩ 78 78 0V ≤ VCM ≤ 5V 82 66 66 79 64 64 87 80 80 78 78 −0.25 0 0 Voltage Range 5.25 5.0 5.0 270 100 80 V/mV 70 33 25 min Large Signal RL = 10k Output Swing RL = 100k 0.005 4.995 RL = 10k 0.01 0.01 V 0.013 max 4.98 4.98 V 4.93 4.93 4.90 2 min V max 4.97 0.06 V 0.013 0.02 RL = 2k www.national.com dB min Input Common-Mode Voltage Gain VO 30 80 107 Rejection Ratio VCM 526 30 126 5V ≤ V+ ≤ 24V nA max 526 0V ≤ VCM ≤ 4V Rejection Ratio PSRR 300 V min 0.1 0.1 V 0.133 0.133 max 4.86 4.86 V (Note 8) (Continued) Unless otherwise specified, all limits guaranteed for TA = 25˚C, V+ = 5.0V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to V+/2. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) ISC Output Short Sourcing 13 LM6144AI LM6144BI LM6142AI LM6142BI Limit Limit (Note 6) (Note 6) 4.80 4.80 Units min 10 8 mA Circuit Current 4.9 4 min LM6142 35 35 mA max Sinking 24 10 10 mA 5.3 5.3 min 35 35 mA 6 6 mA Circuit Current 3 3 min LM6144 35 35 max ISC Output Short Sourcing 8 mA max Sinking 22 8 8 mA 4 4 min 35 35 mA max IS Supply Current Per Amplifier 650 800 800 µA 880 880 max 5.0V AC Electrical Characteristics (Note 8) Unless Otherwise Specified, All Limits Guaranteed for TA = 25˚C, V+ = 5.0V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to V+/2. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) SR Slew Rate 8 VPP @ V+ 12V φm en Gain-Bandwidth Product f = 50 kHz LM6144BI LM6142BI Units Limit Limit (Note 6) (Note 6) 25 15 13 13 11 min 17 10 10 MHz 6 6 min RS > 1 kΩ GBW LM6144AI LM6142AI V/µs Phase Margin 38 Deg Amp-to-Amp Isolation 130 dB Input-Referred f = 1 kHz 16 f = 1 kHz 0.22 f = 10 kHz, RL = 10 kΩ, 0.003 Voltage Noise in Input-Referred Current Noise T.H.D. Total Harmonic Distortion 3 % www.national.com LM6142/LM6144 5.0V DC Electrical Characteristics LM6142/LM6144 2.7V DC Electrical Characteristics (Note 8) Unless Otherwise Specified, All Limits Guaranteed for TA = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to V+/2. Boldface limits apply at the temperature extreme Symbol VOS Parameter Input Offset Voltage IB Input Bias Current IOS Input Offset Current RIN CMRR PSRR Conditions LM6144AI LM6144BI Typ LM6142AI LM6142BI (Note 5) Limit Limit (Note 6) (Note 6) 1.8 2.5 mV 4.3 5 max 250 300 nA 526 526 max 30 30 nA 80 80 max 0.4 150 4 Input Resistance Units 128 MΩ dB min Common Mode 0V ≤ VCM ≤ 1.8V 90 Rejection Ratio 0V ≤ VCM ≤ 2.7V 76 Power Supply 3V ≤ V+ ≤ 5V 79 Rejection Ratio VCM Input Common-Mode −0.25 0 0 V min Voltage Range 2.95 2.7 2.7 V max AV Large Signal VO Output Swing RL = 10k 55 V/mV Voltage Gain min RL = 100kΩ 0.019 2.67 IS Supply Current Per Amplifier 510 0.08 0.08 V 0.112 0.112 max 2.66 2.66 V 2.25 2.25 min 800 800 µA 880 880 max 2.7V AC Electrical Characteristics (Note 8) Unless Otherwise Specified, All Limits Guaranteed for TA = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to V+/2. Boldface limits apply at the temperature extreme Symbol Parameter Conditions Typ (Note 5) GBW Gain-Bandwidth Product φm Gm www.national.com f = 50 kHz LM6144AI LM6144BI LM6142AI LM6142BI Limit Limit (Note 6) (Note 6) Units 9 MHz Phase Margin 36 Deg Gain Margin 6 dB 4 (Note 8) Unless Otherwise Specified, All Limits Guaranteed for TA = 25˚C, V+ = 24V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to V+/2. Boldface limits apply at the temperature extreme Symbol VOS Parameter Conditions Input Offset Voltage IB Input Bias Current IOS Input Offset Current LM6144AI LM6144BI Typ LM6142AI LM6142BI (Note 5) Limit Limit (Note 6) (Note 6) 2 3.8 mV 4.8 4.8 max 1.3 174 Units nA max 5 nA max RIN CMRR PSRR Input Resistance 288 MΩ dB min Common Mode 0V ≤ VCM ≤ 23V 114 Rejection Ratio 0V ≤ VCM ≤ 24V 100 Power Supply 0V ≤ VCM ≤ 24V 87 Rejection Ratio VCM AV Input Common-Mode −0.25 0 0 V min Voltage Range 24.25 24 24 V max Large Signal RL = 10k 500 RL = 10 kΩ 0.07 V/mV Voltage Gain VO Output Swing min 23.85 IS Supply Current Per Amplifier 750 GBW Gain-Bandwidth Product f = 50 kHz 18 0.15 0.15 V 0.185 0.185 max 23.81 23.81 V 23.62 23.62 min 1100 1100 µA 1150 1150 max 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, 1.5kΩ in series with 100pF. 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. Note 7: For guaranteed military specifications see military datasheet MNLM6142AM-X. Note 8: 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 the internal self heating where TJ > TA. 5 www.national.com LM6142/LM6144 24V Electrical Characteristics LM6142/LM6144 Typical Performance Characteristics TA = 25˚C, RL = 10 kΩ Unless Otherwise Specified Supply Current vs. Supply Voltage Offset Voltage vs. Supply Voltage 01205715 01205716 Bias Current vs. Supply Voltage Offset Voltage vs. VCM 01205717 01205718 Offset Voltage vs. VCM Offset Voltage vs. VCM 01205719 www.national.com 01205720 6 LM6142/LM6144 Typical Performance Characteristics TA = 25˚C, RL = 10 kΩ Unless Otherwise Specified (Continued) Bias Current vs. VCM Bias Current vs. VCM 01205721 01205722 Bias Current vs. VCM Open-Loop Transfer Function 01205723 01205724 Open-Loop Transfer Function Open-Loop Transfer Function 01205725 01205726 7 www.national.com LM6142/LM6144 Typical Performance Characteristics TA = 25˚C, RL = 10 kΩ Unless Otherwise Specified (Continued) Output Voltage vs. Source Current Output Voltage vs. Source Current 01205727 01205729 Output Voltage vs. Source Current Output Voltage vs. Sink Current 01205728 01205730 Output Voltage vs. Sink Current Output Voltage vs. Sink Current 01205731 www.national.com 01205732 8 LM6142/LM6144 Typical Performance Characteristics TA = 25˚C, RL = 10 kΩ Unless Otherwise Specified (Continued) Gain and Phase vs. Load Gain and Phase vs. Load 01205733 01205734 Distortion + Noise vs. Frequency GBW vs. Supply 01205736 01205735 Open Loop Gain vs. Load, 3V Supply Open Loop Gain vs. Load, 5V Supply 01205737 01205738 9 www.national.com LM6142/LM6144 Typical Performance Characteristics TA = 25˚C, RL = 10 kΩ Unless Otherwise Specified (Continued) Open Loop Gain vs. Load, 24V Supply Unity Gain Frequency vs. VS 01205740 01205739 CMRR vs. Frequency Crosstalk vs. Frequency 01205741 01205742 PSRR vs. Frequency Noise Voltage vs. Frequency 01205743 www.national.com 01205744 10 LM6142/LM6144 Typical Performance Characteristics TA = 25˚C, RL = 10 kΩ Unless Otherwise Specified (Continued) Noise Current vs. Frequency NF vs. RSource 01205712 01205745 LM6142/LM6144 Application Ideas Slew Rate vs. ∆ VIN VS = ± 5V The LM6142 brings a new level of ease of use to op amp 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 op amps, 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. Figure 2 shows how excess input signal, is routed around the input collector-base junctions, directly to the current mirrors. The LM6142/LM6144 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 1.) As the overdrive increases, the op amp reacts better than a conventional op amp. Large fast pulses will raise the slewrate to around 30V to 60V/µs. 01205707 FIGURE 1. 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 op amps when they are overdriven. 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 op amps. 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 op amps 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. 11 www.national.com LM6142/LM6144 LM6142/LM6144 Application Ideas (Continued) 01205709 FIGURE 4. 01205706 FIGURE 2. These features allow the LM6142 to drive capacitive loads as large as 1000pF at unity gain and not oscillate. The scope photos (Figure 3 and Figure 4) above show the LM6142 driving a l000pF load. In Figure 3, the upper trace is with no capacitive load and the lower trace is with a 1000pF load. Here we are operating on ± 12V supplies with a 20 VPP pulse. Excellent response is obtained with a Cf of l0pF. In Figure 4, the supplies have been reduced to ± 2.5V, the pulse is 4 VPP and Cf is 39pF. 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 op amps 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. 01205710 FIGURE 5. Typical Applications FISH FINDER/ DEPTH SOUNDER. The LM6142/LM6144 is an excellent choice for battery operated fish finders. The low supply current, high gainbandwidth 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/LM6144 a good choice for buffering the inputs of A to D converters. 3 OP AMP INSTRUMENTATION AMP WITH RAIL-TO-RAIL INPUT AND OUTPUT Using the LM6144, a 3 op amp 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 01205708 FIGURE 3. www.national.com 12 (Continued) 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. 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 6). These buffers assure that the input impedance is over 100MΩ 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. 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 past the supplies so the combined common mode voltage plus the signal should not be greater than the supplies or limiting will occur. SPICE MACROMODEL A SPICE macromodel of this and many other National Semiconductor op amps is available at no charge from the NSC Customer Response Group at 800-272-9959. 01205713 FIGURE 6. Ordering Information Package 8-Pin Molded DIP Temperature Range Temperature Range Industrial Military −40˚C to +85˚C −55˚C to +125˚C LM6142AIN NSC Drawing N08E LM6142BIN 8-Pin Small Outline LM6142AIM M08A LM6142AIMX LM6142BIM LM6142BIMX 14-Pin Molded DIP LM6144AIN N14A LM6144BIN 14-Pin Small Outline LM6144AIM M14A LM6144AIMX LM6144BIM LM6144BIMX 8-Pin CDIP LM6142AMJ-QML 13 J08A www.national.com LM6142/LM6144 Typical Applications LM6142/LM6144 Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin Cerdip Dual-In-Line Package NS Package Number J08A 8-Pin Small Outline Package NS Package Number M08A www.national.com 14 LM6142/LM6144 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Pin Small Outline Package NS Package Number M14A 8-Pin Molded Dual-In-Line Package NS Package Number N08E 15 www.national.com LM6142/LM6144, 17 MHz Rail-to-Rail Input-Output Operational Amplifiers Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Pin Molded Dual-In-Line Package NS Package Number N14A 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. 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. 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. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center 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 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560