LMV341/LMV342/LMV344 Single with Shutdown/Dual/Quad General Purpose, 2.7V, Rail-to-Rail Output, 125˚C, Operational Amplifiers General Description The LMV341/342/344 are single, dual, and quad low voltage, and low power Operational Amplifiers. They are designed specifically for low voltage portable applications. Other important product characteristics are low input bias current, rail-to-rail output, and wide temperature range. The patented class AB turnaround stage significantly reduces the noise at higher frequencies, power consumption, and offset voltage. The PMOS input stage provides the user with ultra-low input bias current of 20fA (typical) and high input impedance. The industrial-plus temperature range of -40˚C to 125˚C allows the LMV341/342/344 to accommodate a broad range of extended environment applications. LMV341 expands National Semiconductor’s Silicon Dust™ amplifier portfolio offering enhancements in size, speed, and power savings. The LMV341/342/344 are guaranteed to operate over the voltage range of 2.7V to 5.0V and all have rail-to-rail output. The LMV341 offers a shutdown pin that can be used to disable the device. Once in shutdown mode, the supply current is reduced to 45pA (typical). The LMV341/342/344 have 29nV Voltage Noise at 10KHz, 1MHz GBW, 1.0V/µs Slew Rate, 0.25mVos, and 0.1µA shutdown current (LMV341.) The LMV341 is offered in the tiny SC70-6L package, the LMV342 in space saving MSOP-8 and SOIC-8, and the LMV344 in TSSOP-14 and SOIC-14. These small package amplifiers offer an ideal solution for applications requiring Connection Diagram minimum PC board footprint. Applications with area constrained PC board requirements include portable electronics such as cellular handsets and PDAs. Features (Typical 2.7V Supply Values;Unless Otherwise Noted) n Guaranteed 2.7V and 5V specifications n Input referred voltage noise (@10kHz) 29nV/ n Supply current (per amplifier) 100µA n Gain bandwidth product 1.0MHz n Slew rate 1.0V/µs n Shutdown Current (LMV341) 45pA n Turn-on time from shutdown (LMV341) 5µs n Input bias current 20fA Applications n n n n n n n n n n Cordless/cellular phones Laptops PDAs PCMCIA/Audio Portable/battery-powered electronic equipment Supply current monitoring Battery monitoring Buffer Filter Driver Sample and Hold Circuit SC70-6L 20030441 Top View Order Number LMV341MG, LMV341MGX LMV342MM, LMV342MMX LMV342MA, LMV342MAX LMV344MT, LMV344MTX LMV344MA, LMV344MAX © 2003 National Semiconductor Corporation DS200304 20030444 www.national.com LMV341/LMV342/LMV344 Single with Shutdown/Dual/Quad General Purpose, 2.7V, Rail-to-Rail Output, 125˚C, Operational Amplifiers March 2003 LMV341/LMV342/LMV344 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Infrared or Convection Reflow (20 sec.) 235˚C Wave Soldering Lead Temp. (10 sec.) 260˚C ESD Tolerance (Note 2) Machine Model 2000V + Temperature Range ± Supply Voltage Differential Input Voltage Supply Voltage (V Operating Ratings (Note 1) 200V Human Body Model -V −) 5.5V Output Short Circuit to V + Output Short Circuit to V − Storage Temperature Range JA) 6-Pin SC70 (Note 3) (Note 4) −65˚C to 150˚C Junction Temperature (Note 5) −40˚C to 125˚C Thermal Resistance (θ 150˚C Mounting Temperature 414˚C/W 8-Pin SOIC 190˚C/W 8-Pin MSOP 235˚C/W 14-Pin TSSOP 155˚C/W 14-Pin SOIC 145˚C/W 2.7V DC Electrical Characteristics (Note 10) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol VOS Parameter Input Offset Voltage Min (Note 7) Typ (Note 6) Max (Note 7) LMV341 0.25 4 4.5 LMV342/LMV344 0.55 5 5.5 Conditions TCVOS Input Offset Voltage Average Drift 1.7 IB Input Bias Current 0.02 IOS Input Offset Current IS Supply Current Shutdown Mode, VSD = 0V (LMV341) mV µV/˚C 120 250 pA 100 170 230 µA 45pA 1µA 1.5µA 6.6 Per Amplifier Units fA CMRR Common Mode Rejection Ratio 0V ≤ VCM ≤ 1.7V 0V ≤ VCM ≤ 1.6V 56 50 80 dB PSRR Power Supply Rejection Ratio 2.7V ≤ V+ ≤ 5V 65 60 82 dB VCM Input Common Mode Voltage For CMRR ≥ 50dB 0 −0.2 to 1.9 (Range) AV Large Signal Voltage Gain RL = 10kΩ to 1.35V 78 70 113 RL = 2kΩ to 1.35V 72 64 103 VO Output Swing RL = 2kΩ to 1.35V 24 60 95 RL = 10kΩ to 1.35V www.national.com 2 V dB 60 95 26 5.0 30 40 1.7 5.3 30 40 mV (Note 10) (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol IO Min (Note 7) Typ (Note 6) Sourcing LMV341/LMV342 20 32 Sourcing LMV344 18 24 Sinking 15 24 Parameter Output Short Circuit Current Conditions ton Turn-on Time from Shutdown (LMV341) VSD Shutdown Pin Voltage Range ON Mode (LMV341) Max (Note 7) Units mA 5 Shutdown Mode (LMV341) µs 1.7 to 2.7 2.4 to 2.7 0 to 1 0 to 0.8 V 2.7V AC Electrical Characteristics (Note 10) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 7) Typ (Note 6) Max (Note 7) Units SR Slew Rate RL = 10kΩ, (Note 9) 1.0 V/µs GBW Gain Bandwidth Product RL = 100kΩ, CL = 200pF 1.0 MHz Φm Phase Margin RL = 100kΩ 72 deg Gm Gain Margin RL = 100kΩ 20 en Input-Referred Voltage Noise f = 1kHz 40 nV/ in Input-Referred Current Noise f = 1kHz 0.001 pA/ THD Total Harmonic Distortion f = 1kHz, AV = +1 RL = 600Ω, VIN = 1VPP 0.017 dB % 5V DC Electrical Characteristics (Note 10) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = V+/2, VO = V+/2 and R Boldface limits apply at the temperature extremes. Symbol VOS Parameter Input Offset Voltage Min (Note 7) Typ (Note 6) Max (Note 7) LMV341 0.025 4 4.5 LMV342/LMV344 0.70 5 5.5 Conditions TCVOS Input Offset Voltage Average Drift 1.9 IB Input Bias Current 0.02 IOS Input Offset Current IS Supply Current Shutdown Mode, VSD = 0V (LMV341) > 1MΩ. Units mV µV/˚C 200 375 pA 107 200 260 µA 0.033 1 1.5 µA 6.6 Per Amplifier L fA CMRR Common Mode Rejection Ratio 0V ≤ VCM ≤ 4.0V 0V ≤ VCM ≤ 3.9V 56 50 86 dB PSRR Power Supply Rejection Ratio 2.7V ≤ V+ ≤ 5V 65 60 82 dB VCM Input Common Mode Voltage For CMRR ≥ 50dB 0 −0.2 to 4.2 (Range) 3 4 V www.national.com LMV341/LMV342/LMV344 2.7V DC Electrical Characteristics LMV341/LMV342/LMV344 5V DC Electrical Characteristics (Note 10) (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = V+/2, VO = V+/2 and R Boldface limits apply at the temperature extremes. Symbol AV VO Min (Note 7) Typ (Note 6) RL = 10kΩ to 2.5V 78 70 116 RL = 2kΩ to 2.5V 72 64 107 Parameter Large Signal Voltage Gain (Note 8) Output Swing Conditions RL = 2kΩ to 2.5V RL = 10kΩ to 2.5V IO Output Short Circuit Current Max (Note 7) 60 95 7 7 Sourcing 85 113 Sinking 50 75 ton Turn-on Time from Shutdown (LMV341) VSD Shutdown Pin Voltage Range ON Mode (LMV341) Units mV 34 30 40 30 40 mV mA 5 Shutdown Mode (LMV341) > 1MΩ. dB 32 60 95 L µs 3.1 to 5 4.5 to 5.0 0 to 1 0 to 0.8 V 5V AC Electrical Characteristics (Note 10) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = V+/2, VO = V+/2 and R Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 7) Typ (Note 6) Max (Note 7) L > 1MΩ. Units SR Slew Rate RL = 10kΩ, (Note 9) 1.0 V/µs GBW Gain-Bandwidth Product RL = 10kΩ, CL = 200pF 1.0 MHz Φm Phase Margin RL = 100kΩ 70 deg Gm Gain Margin RL = 100kΩ 20 en Input-Referred Voltage Noise f = 1kHz 39 nV/ in Input-Referred Current Noise f = 1kHz 0.001 pA/ THD Total Harmonic Distortion f = 1 kHz, AV = +1 RL = 600Ω, VIN = 1VPP 0.012 dB % 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, 1.5kΩ in series with 100pF. Machine model, 0Ω in series with 200pF. Note 3: Shorting output to V+ will adversely affect reliability. Note 4: Shorting output to V- will adversely affect reliability. Note 5: 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 6: Typical values represent the most likely parametric norm. Note 7: All limits are guaranteed by testing or statistical analysis. Note 8: RL is connected to mid-supply. The output voltage is GND + 0.2V ≤ VO ≤ V+ −0.2V Note 9: Connected as voltage follower with 2VPP step input. Number specified is the slower of the positive and negative slew rates. Note 10: 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 SC70-6L 8-Pin MSOP/SOIC 20030441 Top View 14-Pin TSSOP/SOIC 20030452 20030451 Top View Top View Ordering Information Package 6-Pin SC70 8-Pin MSOP 8-Pin SOIC 14-Pin TSSOP 14-Pin SOIC Part Number LMV341MG LMV341MGX LMV342MM LMV342MMX LMV342MA LMV342MAX LMV344MT LMV344MTX LMV344MA LMV344MAX Package Marking Transport Media 1k Units Tape and Reel A78 3k Units Tape and Reel 1k Units Tape and Reel A82A 3.5k Units Tape and Reel LMV342MA LMV344MT LMV344MA 5 95 Units/Rail 2.5k Units Tape and Reel Rails 2.5k Units Tape and Reel 55 Units/Rail 2.5k Units Tape and Reel NSC Drawing MAA06A MUA08A M08A MTC14 M14A www.national.com LMV341/LMV342/LMV344 Connection Diagrams LMV341/LMV342/LMV344 Typical Performance Characteristics Supply Current vs. Supply Voltage (LMV341) Input Current vs. Temperature 20030428 20030446 Output Voltage Swing vs. Supply Voltage Output Voltage Swing vs. Supply Voltage 20030426 20030427 ISOURCE vs. VOUT ISOURCE vs. VOUT 20030429 www.national.com 20030430 6 LMV341/LMV342/LMV344 Typical Performance Characteristics (Continued) ISINK vs. VOUT ISINK vs. VOUT 20030432 20030431 VOS vs. VCM VOS vs. VCM 20030433 20030434 VIN vs. VOUT VIN vs. VOUT 20030435 20030436 7 www.national.com LMV341/LMV342/LMV344 Typical Performance Characteristics (Continued) CMRR vs. Frequency PSRR vs. Frequency 20030401 20030403 Input Voltage Noise vs. frequency Slew Rate vs. VSUPPLY 20030404 20030402 Slew Rate vs. Temperature Slew Rate vs. Temperature 20030422 www.national.com 20030423 8 LMV341/LMV342/LMV344 Typical Performance Characteristics (Continued) THD+N vs. Frequency THD+N vs. VOUT 20030425 20030424 Open Loop Frequency Over Temperature Open Loop Frequency Response 20030421 20030420 Open Loop Frequency Response Gain & Phase vs. CL 20030419 20030417 9 www.national.com LMV341/LMV342/LMV344 Typical Performance Characteristics (Continued) Gain & Phase vs. CL Stability vs. Capacitive Load 20030448 20030418 Stability vs. Capacitive Load Non-Inverting Small Signal Pulse Response 20030405 20030449 Non-Inverting Large Signal Pulse Response Non-Inverting Small Signal Pulse Response 20030408 www.national.com 20030406 10 (Continued) Non-Inverting Large Signal Pulse Response Non-Inverting Small Signal Pulse Response 20030409 20030407 Non-Inverting Large Signal Pulse Response Inverting Small Signal Pulse Response 20030410 20030411 Inverting Large Signal Pulse Response Inverting Small Signal Pulse Response 20030414 20030412 11 www.national.com LMV341/LMV342/LMV344 Typical Performance Characteristics LMV341/LMV342/LMV344 Typical Performance Characteristics (Continued) Inverting Large Signal Pulse Response Inverting Small Signal Pulse Response 20030415 20030413 Inverting Large Signal Pulse Response Crosstalk Rejection vs. Frequency 20030416 20030454 www.national.com 12 LMV341/342/344 ances, along with the ability of the shutdown pin to be derived from a separate power source, make LMV341 a good choice for sample and hold circuits. The sample clock should be connected to the shutdown pin of the amplifier to rapidly turn the device on or off. Figure 2 shows the schematic of a simple sample and hold circuit. When the sample clock is high the first amplifier is in normal operation mode and the second amplifier acts as a buffer. The capacitor, which appears as a load on the first amplifier, will be charging at this time. The voltage across the capacitor is that of the non-inverting input of the first amplifier since it is connected as a voltage-follower. When the sample clock is low the first amplifier is shut off, bringing the output impedance to a high value. The high impedance of this output, along with the very high impedance on the input of the second amplifier, prevents the capacitor from discharging. There is very little voltage droop while the first amplifier is in shutdown mode. The second amplifier, which is still in normal operation mode and is connected as a voltage follower, also provides the voltage sampled on the capacitor at its output. The LMV341/342/344 family of amplifiers features low voltage, low power, and rail-to-rail output operational amplifiers designed for low voltage portable applications. The family is designed using all CMOS technology. This results in an ultra low input bias current. The LMV341 has a shutdown option, which can be used in portable devices to increase battery life. A simplified schematic of the LMV341/342/344 family of amplifiers is shown in Figure 1. The PMOS input differential pair allows the input to include ground. The output of this differential pair is connected to the Class AB turnaround stage. This Class AB turnaround has a lower quiescent current, compared to regular turnaround stages. This results in lower offset, noise, and power dissipation, while slew rate equals that of a conventional turnaround stage. The output of the Class AB turnaround stage provides gate voltage to the complementary common-source transistors at the output stage. These transistors enable the device to have rail-to-rail output. 20030444 20030453 FIGURE 2. Sample and Hold Circuit FIGURE 1. Simplified Schematic SHUTDOWN FEATURE The LMV341 is capable of being turned off in order to conserve power and increase battery life in portable devices. Once in shutdown mode the supply current is drastically reduced, 1µA maximum, and the output will be "tri-stated." The device will be disabled when the shutdown pin voltage is pulled low. The shutdown pin should never be left unconnected. Leaving the pin floating will result in an undefined operation mode and the device may oscillate between shutdown and active modes. The LMV341 typically turns on 2.8µs after the shutdown voltage is pulled high. The device turns off in less than 400ns after shutdown voltage is pulled low. Figure 3 and Figure 4 show the turn-on and turn-off time of the LMV341, respectively. In order to reduce the effect of the capacitance added to the circuit by the scope probe, in the turn-off time circuit a resistive load of 600Ω is added. Figure 5 and Figure 6 show the test circuits used to obtain the two plots. CLASS AB TURNAROUND STAGE AMPLIFIER This patented folded cascode stage has a combined class AB amplifier stage, which replaces the conventional folded cascode stage. Therefore, the class AB folded cascode stage runs at a much lower quiescent current compared to conventional folded cascode stages. This results in significantly smaller offset and noise contributions. The reduced offset and noise contributions in turn reduce the offset voltage level and the voltage noise level at the input of the LMV341/342/344. Also the lower quiescent current results in a high open-loop gain for the amplifier. The lower quiescent current does not affect the slew rate of the amplifier nor its ability to handle the total current swing coming from the input stage. The input voltage noise of the device at low frequencies, below 1kHz, is slightly higher than devices with a BJT input stage; However the PMOS input stage results in a much lower input bias current and the input voltage noise drops at frequencies above 1kHz. SAMPLE AND HOLD CIRCUIT The lower input bias current of the LMV341 results in a very high input impedance. The output impedance when the device is in shutdown mode is quite high. These high imped- 13 www.national.com LMV341/LMV342/LMV344 Application Section LMV341/LMV342/LMV344 Application Section (Continued) 20030443 FIGURE 6. Turn-off Time LOW INPUT BIAS CURRENT The LMV341/LMV342/LMV344 Amplifiers have a PMOS input stage. As a result, they will have a much lower input bias current than devices with BJT input stages. This feature makes these devices ideal for sensor circuits. A typical curve of the input bias current of the LMV341 is shown in Figure 7. 20030440 FIGURE 3. Turn-on Time 20030439 FIGURE 4. Turn-off Time 20030447 FIGURE 7. Input Bias Current vs. VCM 20030442 FIGURE 5. Turn-on Time www.national.com 14 LMV341/LMV342/LMV344 Physical Dimensions inches (millimeters) unless otherwise noted 6-Pin SC70 NS Package Number MAA06A 8-Pin MSOP NS Package Number MUA08A 15 www.national.com LMV341/LMV342/LMV344 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Pin SOIC NS Package Number M08A 14-Pin TSSOP NS Package Number MTC14 www.national.com 16 inches (millimeters) unless otherwise noted (Continued) 14-Pin SOIC NS Package Number M14A 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 Americas Customer Support Center Email: [email protected] Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: [email protected] 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 Support Center Fax: +65-6250 4466 Email: [email protected] Tel: +65-6254 4466 National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: [email protected] Tel: 81-3-5639-7560 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. LMV341/LMV342/LMV344 Single with Shutdown/Dual/Quad General Purpose, 2.7V, Rail-to-Rail Output, 125˚C, Operational Amplifiers Physical Dimensions