LMC272 CMOS Dual Low Cost Rail to Rail Output Operational Amplifier General Description Features The LMC272 is a CMOS dual operational amplifier with rail-to-rail output swing and an input common voltage range that extends below the negative supply. Other performance characteristics include low voltage operation, low bias current, excellent channel-to-channel isolation, good bandwidth performance and a competitive price. These devices are available in MSOP package which is about half the size of a SO-8 device. This enables the designer to fit the device in extremely small applications. The LMC272C is a direct replacement for TLC272C with performance which meets or exceeds the TLC272C’s guaranteed limits in the commercial temperature range when operating from a supply of 2.7V to 15V (see Electrical Characteristics table for details). These features make this cost effective device ideal for new designs as well as for upgrading existing designs. Applications include hand-held analytic instruments, transducer amplifiers, sample and hold circuits, etc. (Typical unless otherwise noted) VS = 5V, TA = 25˚C n Output Swing to within 60 mV of supply rail (10 kΩ load) n High voltage gain: 90 dB n Unity gain-bandwidth: 2.0 MHz n Wide supply voltage: 2.7V to 15V n Characterized for: 2.7V, 5V, 10V n Low supply current: 0.975 mA/amplifier n Input voltage range: −0.3V to 4.2V Applications n n n n n Portable instruments Upgrade for TLC272C and TS272C Photodetector preamplifiers D/A converters Filters Connection Diagram DS012867-1 Top View Ordering Information Package Ordering NSC Drawing Package Information Number Marking Supplied as 8-pin Molded DIP LMC272CN N08E LMC272CN 8-pin SO-8 LMC272CM M08A LMC272CM Rails LMC272CMX M08A LMC272CM 2.5k Tape and Reel LMC272CMM MUA08A A07 Rails LMC272CMMX MUA08A A07 3k Tape and Reel MSOP © 1999 National Semiconductor Corporation DS012867 Rails www.national.com LMC272 CMOS Dual Low Cost Rail to Rail Output Operational Amplifier December 1996 Absolute Maximum Ratings (Note 1) Storage Temp. Range Junction Temperature (Note 4) 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 (Note 10) Current at Output Pin (Note 3) (Note 7) Lead Temperature (soldering, 10 sec.) −65˚C to +150˚C 150˚C Operating Ratings(Note 1) 2 kV Supply Voltage Junction Temperature Range LMC272C Thermal Resistance (θJA) N Package, 8-pin Molded DIP M Package, 8-pin Surface Mount MSOP Package ± Supply Voltages (V+)+0.3V, (V−)−0.3V 16V ± 5 mA ± 30 mA 2.5V ≤ VS ≤ 15V 0˚C ≤ TJ ≤ +70˚C 115˚ C/W 177˚ C/W 235˚ C/W 260˚C 2.7V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2, RL to ground, and RL > 1 MΩ. Boldface limits apply at the temperature extremes Typ Symbol Parameter Conditions (Note 5) LMC272C Limit Units (Note 6) VOS TCVOS Input Offset Voltage Temp. Coefficient of VO = 1.4V, RS = 50, VCM = 0V, RL = 10k TA = 0˚C to 70˚C 1.40 7 mV 9 max 3.9 µV/˚C Input Offset Voltage IB Input Bias Current 1 64 pA max IOS Input Offset Current 0.5 32 pA max CMRR Common Mode VCM = −0.2V to 1.2V 77 Rejection Ratio PSRR Power Supply V+ = 2.7V to 5V, VO = 1.4V 75 Rejection Ratio VCM Input Common-Mode CMRR ≥ 50 dB 1.7 Voltage Range −0.3 AV Large Signal Voltage VO = 0.25V to 2.45V, RL = 10k 65 dB 60 min 65 dB 60 min 1.5 V 1.2 min −0.2 V −0.2 max 88 dB Gain VO Output Swing RL = 10 kΩ, VID = 100 mV (Note 11) VID = −100 mV 2.64 V min 0 (Note 11) ISC 2.55 Output Short Circuit Sourcing, VID = 100 mV Current (Note 11) Sinking, VID = −100 mV 20 mV 25 max 3.7 mA 2.5 mA (Note 11) IS www.national.com Total Supply Current 1.60 2 2.5 mA 3.0 max 2.7V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2, RL to ground and RL > 1 MΩ. Boldface limits apply at the temperature extremes Typ Symbol Parameter Conditions (Note 5) LMC272C Limit Units (Note 6) SR GBW φm en AV = +1, RL = 10 kΩ, VI = 1 VPP, CL = 20 pF 1.7 V/µs Unity Gain Frequency (Note 12) VI = 10 mVPP, CL = 20 pF 1.9 MHz Phase Margin (Note 12) VI = 10 mVPP, CL = 20 pF 39 Deg Input-Referred (Note 12) f = 1 kHz, RS = 20Ω 27 Slew Rate (Note 8) Voltage Noise in Input-Referred f = 1 kHz 0.0015 Current Noise fmax THD Full Power Bandwidth VS = 10V, CL = 20 pF, RL = 20 kΩ 120 kHz Amp-to-Amp Isolation (Note 9) AV = +1, VIN = 0.7VPP f = 1 kHz 150 dB 0.035 % Total Harmonic Distortion 3 www.national.com 5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V+/2, RL to ground and RL > 1 MΩ. Boldface limits apply at the temperature extremes Typ Symbol Parameter Conditions (Note 5) LMC272C Limit Units (Note 6) VOS TCVOS Input Offset Voltage Temp. Coefficient of VO = 1.4V, RS = 50, RL = 10k, VCM = 0V TA = 0˚C to 70˚C 1.75 7 mV 9 max 3.3 µV/˚C Input Offset Voltage IB Input Bias Current 1 64 pA max IOS Input Offset Current 0.5 32 pA max CMRR Common Mode VCM = −0.2V to 3.5V 77 Rejection Ratio PSRR Power Supply V+ = 5V to 10V, VO = 1.4V 88 Rejection Ratio VCM Input Common-Mode CMRR ≥ 50 dB 4.2 Voltage Range −0.3 AV Large Signal Voltage VO = 0.25V to 2V, RL = 10k 90 Gain VO Output Swing RL = 10 kΩ, VID = 100 mV (Note 11) VID = −100 mV 4.94 0 (Note 11) ISC Output Short Circuit Sourcing, VID = 100 mV Current (Note 11) Sinking, VID = −100 mV 65 dB 60 min 65 dB 60 min 4 V 3.5 min −0.2 V −0.2 max 80 dB 72 min 4.85 V 4.75 min 20 mV 25 max 16 mA 16 mA (Note 11) IS www.national.com 1.95 4 3.2 mA 3.6 max 5V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V+/2, RL to ground and RL > 1 MΩ. Boldface limits apply at the temperature extremes Typ Symbol Parameter Conditions (Note 5) LMC272C Limit Units (Note 6) SR GBW φm en AV = +1, RL = 10 kΩ, VI = 1 VPP, CL = 20 pF 2.5 (Note 12) AV = +1, RL = 10 kΩ, VI = 2.5 VPP, CL = 20 pF 2.5 Unity Gain Frequency (Note 12) VI = 10 mV, CL = 20 pF 2.0 MHz Phase Margin (Note 12) VI = 10 mV, CL = 20 pF 43 Deg Input-Referred (Note 12) f = 1 kHz, RS = 20Ω 25 Slew Rate (Note 8) V/µs Voltage Noise in Input-Referred f = 1 kHz 0.0015 Current Noise fmax THD Full Power Bandwidth VS = 10V, CL = 20 pF, RL = 20 kΩ 120 kHz Amp-to-Amp Isolation (Note 9) AV = +1, VIN = 2.5 VPP f = 1 kHz 150 dB 0.015 % Total Harmonic Distortion 5 www.national.com 10V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 10V, V− = 0V, VCM = VO = V+/2, RL to ground and RL > 1 MΩ. Boldface limits apply at the temperature extremes Typ Symbol Parameter Conditions (Note 5) LMC272C Limit Units (Note 6) VOS TCVOS Input Offset Voltage Temp. Coefficient of VO = 1.4V, RS = 50, RL = 10k, VCM = 0V TA = 0˚C to 70˚C 2.1 7 mV 9 max 3.6 µV/˚C Input Offset Voltage IB Input Bias Current 1 64 pA max IOS Input Offset Current 0.5 32 pA max CMRR Common Mode VCM = −0.2V to 8.5V 77 Rejection Ratio PSRR Power Supply V+ = 5V to 10V, VO = 1.4V 88 Rejection Ratio VCM Input Common-Mode CMRR ≥ 50 dB 9.2 Voltage Range −0.3 AV Large Signal Voltage VO = 1V to 6V, RL = 10k 95 Gain VO Output Swing RL = 10 kΩ, VID = 100 mV (Note 11) VID = −100 mV 9.93 33 (Note 11) ISC Output Short Circuit Sourcing, VID = 100 mV Current (Note 11) Sinking, VID = −100 mV 65 dB 60 min 65 dB 60 min 9 V 8.5 min −0.2 V −0.2 max 85 dB 78 min 9.85 V 9.75 min 45 mV 50 max 55 mA 25 mA (Note 11) IS www.national.com Total Supply Current 2.25 6 3.6 mA 4.0 max 10V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 10V, V− = 0V, VCM = VO = V+/2, RL to ground and RL > 1 MΩ. Boldface limits apply at the temperature extremes Typ Symbol Parameter Conditions (Note 5) LMC272C Limit Units (Note 6) SR GBW φm en AV = +1, RL = 10 kΩ, VI = 1 VPP, CL = 20 pF 2.65 (Note 12) AV = +1, RL = 10 kΩ, VI = 5.5 VPP, CL = 20 pF 2.65 Unity Gain Frequency (Note 12) VI = 10 mV, CL = 20 pF 2.1 MHz Phase Margin (Note 12) VI = 10 mV, CL = 20 pF 44 Deg Input-Referred (Note 12) f = 1 kHz, RS = 20Ω 25 Slew Rate (Note 8) V/µs Voltage Noise in Input-Referred f = 1 kHz 0.0015 Current Noise fmax THD Full Power Bandwidth CL = 20 pF, RL = 20 kΩ 120 kHz Amp-to-Amp Isolation (Note 9) AV = +1, VIN = 5 VPP f = 1 kHz 150 dB 0.005 % Total Harmonic Distortion 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. Output currents in excess of ± 30 mA over long term may adversely affect reliability. 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: Do not short circuit output to V+, when V+ is greater than 13V or reliability will be adversely affected. Note 8: Slew rate is the slower of the rising and falling slew rates. Note 9: Input referred, V+ = 10V and RL = 100 kΩ connected to 5V. Each amp excited in turn with 1 kHz to produce about 10 VPP output. Note 10: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings. Note 11: VID is the differential voltage on the non-inverting input with respect to the inverting input. Note 12: VI is the input voltage. 7 www.national.com Typical Performance Characteristics (VS = +5V, single supply, TA = 25˚C, and RL to ground unless otherwise specified) Supply Current vs Supply Voltage Input Current vs Temperature Negative Output Voltage Swing vs Supply Voltage DS012867-6 DS012867-5 DS012867-7 Positive Output Voltage Swing vs Supply Voltage Output Voltage Swing vs Supply Voltage Output Voltage Swing vs Supply Voltage DS012867-8 DS012867-9 Input Offset Voltage vs Temperature Slew Rate vs Supply Voltage DS012867-10 CMRR vs Input Common Mode Voltage (VS = 2.7V) DS012867-11 DS012867-12 DS012867-13 www.national.com 8 Typical Performance Characteristics (VS = +5V, single supply, TA = 25˚C, and RL to ground unless otherwise specified) (Continued) CMRR vs Input Common Mode Voltage (VS = 5V) CMRR vs Input Common Mode Voltage (VS = 10V) Input Voltage vs Output Voltage DS012867-16 DS012867-14 Input Voltage vs Output Voltage DS012867-15 Input Voltage vs Output Voltage Sourcing Current vs Output Voltage DS012867-17 Sinking Current vs Output Voltage DS012867-18 DS012867-19 PSRR vs Frequency CMRR vs Frequency DS012867-21 DS012867-22 DS012867-20 9 www.national.com Typical Performance Characteristics (VS = +5V, single supply, TA = 25˚C, and RL to ground unless otherwise specified) (Continued) Gain/Phase Response vs Temperature Unity Gain Frequency vs Temperature DS012867-23 Input Voltage Noise vs Frequency Crosstalk Rejection vs Frequency DS012867-24 Gain/Phase vs Capacitive Load DS012867-25 THD vs Frequency DS012867-28 DS012867-26 Output Swing vs Frequency DS012867-27 Small Signal Step Response VS = ± 1.35V, AV = +1, ZL = 10 kΩ || 20 pF, VIN = 0.1 VPP DS012867-29 DS012867-30 www.national.com 10 Typical Performance Characteristics (VS = +5V, single supply, TA = 25˚C, and RL to ground unless otherwise specified) (Continued) Small Signal Step Response VS = ± 2.5V, AV = +1, ZL = 10 kΩ || 20 pF, VIN = 0.1 VPP Small Signal Step Response VS = ± 5V, AV = +1, ZL = 10 kΩ || 20 pF, VIN = 0.1 VPP DS012867-31 Large Signal Step Response VS = ± 1.35V, AV = +1, ZL = 10 kΩ || 20 pF, VIN = 1 VPP DS012867-32 Large Signal Step Response VS = ± 2.5V, AV = +1, ZL = 10 kΩ || 20 pF, VIN = 2.4 VPP DS012867-33 DS012867-34 Large Signal Step Response VS = ± 5V, AV = +1, ZL = 10 kΩ || 20 pF, VIN = 5.5 VPP DS012867-35 11 www.national.com Typical Performance Characteristics (VS = +5V, single supply, TA = 25˚C, and RL to ground unless otherwise specified) (Continued) Stability vs Capacitive Load Stability vs Capacitive Load DS012867-37 DS012867-36 Application Information Low Noise Single Supply Preamp DS012867-2 which is a 1000 in this case. There is an inherent trade off between noise voltage and power consumption, input bias current, and input noise current. Input equivalent noise current is inconsequential if the source impedance is small. R1 can be adjusted to vary bias current. To avoid saturation, R3 and R4 should be set such that Q1 and Q3 collector voltages do not exceed 0.5V. Table 1 shows typical noise data for two different R1 settings: It is generally difficult to find already existing solutions in the market which are single supply and low noise. The circuit above is a low noise single supply preamp using the LMC272. It utilizes the feature of input common mode voltage range to ground to achieve zero-volt-in zero-volt-out performance and uses the RR output swing to achieve maximum dynamic range. By introducing a differential pair operating at high bias current as the front end, the equivalent input noise voltage, en, is reduced. The gain is 1 + R5/R6 www.national.com 12 Application Information (Continued) TABLE 1. Equivalent Input Noise Voltage, en, for Two Different Values of R1 Ω mA R1 IC(Q1, 3) en (100 Hz) en (1 kHz) en (10 kHz) 270 1.85 3.2 2.0 1.7 1000 0.50 5.3 2.4 1.9 nV/√Hz Single Supply Twin-T Notch Filter with “Q” Adjustment DS012867-3 R = R1 = R2 = 2R3 C = C1 = C3 = C2/2 Here is another application for the LMC272. This is a single supply notch filter set for 60 Hz using the component values shown, but the frequency can be changed using the equations below. The main feature of this circuit is its ability to adjust the filter selectivity (Q) using RPOT. You can trade off notch depth for Q. Table 2 shows data for two different settings. The LMC272 lends itself nicely to general purpose applications like this because it is very well behaved and easy to use. This filter can operate from 2.7V to 15V supplies. Component value matching is important to achieve good results. Here R4 is used to set the input to within the common mode range of the device to allow maximum swing on the non-inverting input (pin 3). Since R1, R2, and R4 form a voltage divider at low frequencies, C4 is added to introduce a high frequency attenuation in conjunction with C1, and C3. R5 and R6 were picked to set the pass band gain to 0 dB. TABLE 2. Filter Selectivity (Q) vs Notch Depth (dB) Q 13 Notch Depth 0.3 40 6 17 www.national.com Application Information (Continued) Single Supply Wein_Bridge Oscillator with Amplitude and Frequency Adjustment DS012867-4 f(range) = 6.4 kHz to 30 kHz Amplitude Adjustment (range) = 2.8 VPP to 8.6 VPP www.national.com 14 Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC Order Number LMC272CM or LMC272CMX NS Package Number M08A 8-Lead (0.118" Wide) Molded Mini Small Outline Package Order Number LMC272CMM or LMC272CMMX NS Package Number MUA08A 15 www.national.com LMC272 CMOS Dual Low Cost Rail to Rail Output Operational Amplifier Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Lead (0.300" Wide) Molded Dual-In-Line Package Order Number LMC272CN NS Package Number N08E 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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