LMV358A-SR

LMV321A/V358A 1MHZ CMOS Rail-to-Rail IO Opamp with RF Filter Features  Single-Supply Operation from +2.1V ~ +5.5V  Operating Temperature: -40°C ~ +125°C  Rail-to-Rail Input / Output  Embedded RF Anti-EMI Filter  Gain-Bandwidth Product: 1MHz (Typ)  Small Package:  Low Input Bias Current: 1pA (Typ) LMV321A Available in SOT23-5 Package  Low Offset Voltage: ±1mV (Max) LMV358A Available in SOP-8 Package  Quiescent Current: 40μA per Amplifier (Typ) General Description The LMV321A/V358A family have a high gain-bandwidth product of 1MHz, a slew rate of 0.6V/μs, and a quiescent current of 40μA/amplifier at 5V. The LMV321A/V358A family is designed to provide optimal performance in low voltage and low noise systems. They provide rail-to-rail output swing into heavy loads. The input common mode voltage range includes ground, and the maximum input offset voltage is ±1mV for LMV321A/V358A family. They are specified over the extended industrial temperature range (-40℃ to +125℃). The operating range is from 2.1V to 5.5V. The LMV321A single is available in Green SOT23-5 package. The LMV358A Dual is available in Green SOP-8 package. Applications  ASIC Input or Output Amplifier  Audio Output  Sensor Interface  Piezoelectric Transducer Amplifier  Medical Communication  Medical Instrumentation  Smoke Detectors  Portable Systems Pin Configuration Figure 1. Pin Assignment Diagram March 2021-REV_V0 1/11 LMV321A/V358A Absolute Maximum Ratings Condition Min Max -0.5V +7.5V Analog Input Voltage (IN+ or IN-) Vss-0.5V VDD+0.5V PDB Input Voltage Vss-0.5V +7V -40°C +125°C Power Supply Voltage (VDD to Vss) Operating Temperature Range Junction Temperature +160°C Storage Temperature Range -55°C Lead Temperature (soldering, 10sec) +150°C +260°C Package Thermal Resistance (TA=+25℃) SOP-8, θJA 125°C/W SOT23-5, θJA 190°C/W ESD Susceptibility HBM 6KV MM 300V Note: Stress greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions outside those indicated in the operational sections of this specification are not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Package/Ordering Information PACKAGE PACKAGE MARKING DESCRIPTION OPTION INFORMATION LMV321A-TR SOT23-5 Tape and Reel,3000 321 LMV358A-SR SOP-8 Tape and Reel,4000 LMV358 MODEL CHANNEL ORDER NUMBER LMV321A Single LMV358A Dual March 2021-REV_V0 2/11 LMV321A/V358A Electrical Characteristics (At VS = +5V, RL = 100kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted.) LMV321A/V358A PARAMETER SYMBOL CONDITIONS TYP MIN/MAX OVER TEMPERATURE +25℃ +25℃ -40℃ to +85℃ UNITS MIN/MAX 0.1 ±1 ±1.2 mV MAX INPUT CHARACTERISTICS Input Offset Voltage VOS VCM = VS/2 Input Bias Current IB 1 pA TYP Input Offset Current IOS 1 pA TYP Common-Mode Voltage Range VCM -0.1 to +5.6 V TYP Common-Mode Rejection Ratio CMRR Open-Loop Voltage Gain AOL Input Offset Voltage Drift ΔVOS/ΔT VS = 5.5V VS = 5.5V, VCM = -0.1V to 4V 70 62 62 VS = 5.5V, VCM = -0.1V to 5.6V 68 56 55 RL = 5kΩ, VO = +0.1V to +4.9V 80 70 70 RL = 10kΩ, VO = +0.1V to +4.9V 100 94 85 2.7 dB dB MIN MIN μV/℃ TYP OUTPUT CHARACTERISTICS Output Voltage Swing from Rail Output Current VOH RL = 100kΩ 4.997 4.990 4.980 V MIN VOL RL = 100kΩ 3 10 20 mV MAX VOH RL = 10kΩ 4.992 4.970 4.960 V MIN VOL RL = 10kΩ 8 30 40 mV MAX 84 60 45 75 60 45 mA MIN 2.1 2.5 V MIN 5.5 5.5 V MAX 82 60 58 dB MIN 40 60 80 μA MAX 1 MHz TYP ISOURCE ISINK RL = 10Ω to VS/2 POWER SUPPLY Operating Voltage Range Power Supply Rejection Ratio PSRR Quiescent Current / Amplifier IQ VS = +2.5V to +5.5V, VCM = +0.5V DYNAMIC PERFORMANCE (CL = 100pF) Gain-Bandwidth Product Slew Rate Settling Time to 0.1% GBP SR G = +1, 2V Output Step 0.6 V/μs TYP tS G = +1, 2V Output Step 5 μs TYP VIN ꞏGain = VS 2.6 μs TYP f = 1kHz 27 nV / Hz TYP f = 10kHz 20 nV / Hz TYP Overload Recovery Time NOISE PERFORMANCE Voltage Noise Density March 2021-REV_V0 en 3/11 LMV321A/V358A Typical Performance characteristics At TA=+25oC, VS=+5V, and RL=100KΩ connected to VS/2, unless otherwise noted. Large-Signal Step Response Small-Signal Step Response G=+1 CL=100pF RL=100KΩ Output Voltage (20mV/div) Output Voltage (500mV/div) G=+1 CL=100pF RL=100KΩ Time (2µs/div) Supply Current vs. Supply Voltage Short-Circuit Current vs. Supply Voltage Supply Current (uA) Short-Circuit Current (mA) Time (4µs/div) Supply Voltage (V) Supply Voltage (V) Output Voltage vs. Output Current Output Voltage vs. Output Current Vs=5V Sinking Current Output Current (mA) March 2021-REV_V0 Output Voltage (V) Output Voltage (V) Sourcing Current Sourcing Current Vs=3V Sinking Current Output Current (mA) 4/11 LMV321A/V358A Typical Performance characteristics At TA=+25oC, VS=+5V, and RL=100KΩ connected to VS/2, unless otherwise noted. Overload Recovery Time Supply Current (µA) Vs=5V G=-5 VIN=500mV Supply Current vs. Temperature Input Voltage Noise Spectral Density vs. Frequency Open Loop Gain, Phase Shift vs. Frequency at +5V Open Loop Gain (dB) Frequency (kHz) CMRR vs. Frequency PSRR vs. Frequency PSRR (dB) CMRR (dB) Frequency (kHz) Frequency (kHz) March 2021-REV_V0 Phase Shift (Degrees) Temperature (℃) Voltage Noise (nV/√Hz Time (2µs/div) Frequency (kHz) 5/11 LMV321A/V358A Application Note Size LMV321A/V358A family series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. The small footprints of the LMV321A/V358A family packages save space on printed circuit boards and enable the design of smaller electronic products. Power Supply Bypassing and Board Layout LMV321A/V358A family series operates from a single 2.1V to 5.5V supply or dual ±1.05V to ±2.75V supplies. For best performance, a 0.1μF ceramic capacitor should be placed close to the VDD pin in single supply operation. For dual supply operation, both VDD and VSS supplies should be bypassed to ground with separate 0.1μF ceramic capacitors. Low Supply Current The low supply current (typical 40μA per channel) of LMV321A/V358A family will help to maximize battery life. They are ideal for battery powered systems. Operating Voltage LMV321A/V358A family operates under wide input supply voltage (2.1V to 5.5V). In addition, all temperature specifications apply from -40 oC to +125 oC. Most behavior remains unchanged throughout the full operating voltage range. These guarantees ensure operation throughout the single Li-Ion battery lifetime. Rail-to-Rail Input The input common-mode range of LMV321A/V358A family extends 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). This is achieved by using complementary input stage. For normal operation, inputs should be limited to this range. Rail-to-Rail Output Rail-to-Rail output swing provides maximum possible dynamic range at the output. This is particularly important when operating in low supply voltages. The output voltage of LMV321A/V358A family can typically swing to less than 5mV from supply rail in light resistive loads (>100kΩ), and 60mV of supply rail in moderate resistive loads (10kΩ). Capacitive Load Tolerance The LMV321A/V358A family is optimized for bandwidth and speed, not for driving capacitive loads. Output capacitance will create apole in the amplifier’s feedback path, leading to excessive peaking and potential oscillation. If dealing with load capacitance is a requirement of the application, the two strategies to consider are (1) using a small resistor in series with the amplifier’s output and the load capacitance and (2) reducing the bandwidth of the amplifier’s feedback loop by increasing the overall noise gain. Figure 2. shows a unity gain follower using the series resistor strategy. The resistor isolates the output from the capacitance and, more importantly, creates a zero in the feedback path that compensates for the pole created by the output capacitance. - RISO VOUT VIN + CL Figure 2. Indirectly Driving a Capacitive Load Using Isolation Resistor March 2021-REV_V0 6/11 LMV321A/V358A The bigger the RISO resistor value, the more stable VOUT will be. However, if there is a resistive load RL in parallel with the capacitive load, a voltage divider (proportional to RISO/RL) is formed, this will result in a gain error. The circuit in Figure 3 is an improvement to the one in Figure 2. RF provides the DC accuracy by feed-forward the VIN to RL. CF and RISO serve to counteract the loss of phase margin by feeding the high frequency component of the output signal back to the amplifier’s inverting input, thereby preserving the phase margin in the overall feedback loop. Capacitive drive can be increased by increasing the value of CF. This in turn will slow down the pulse response. Figure 3. Indirectly Driving a Capacitive Load with DC Accuracy March 2021-REV_V0 7/11 LMV321A/V358A Typical Application Circuits Differential amplifier The differential amplifier allows the subtraction of two input voltages or cancellation of a signal common the two inputs. It is useful as a computational amplifier in making a differential to single-end conversion or in rejecting a common mode signal. Figure 4. shown the differential amplifier using LMV321A/V358A family. Figure 4. Differential Amplifier VOUT ( RR13RR24 ) RR14 VIN  RR12 VIP ( RR13RR24 ) RR13 VREF If the resistor ratios are equal (i.e. R1=R3 and R2=R4), then VOUT  R2 R1 (VIP  VIN )  VREF Low Pass Active Filter The low pass active filter is shown in Figure 5. The DC gain is defined by –R2/R1. The filter has a -20dB/decade roll-off after its corner frequency ƒC=1/(2πR3C1). Figure 5. Low Pass Active Filter March 2021-REV_V0 8/11 LMV321A/V358A Instrumentation Amplifier The triple LMV321A/V358A family can be used to build a three-op-amp instrumentation amplifier as shown in Figure 6. The amplifier in Figure 6 is a high input impedance differential amplifier with gain of R2/R1. The two differential voltage followers assure the high input impedance of the amplifier. Figure 6. Instrument Amplifier . March 2021-REV_V0 9/11 LMV321A/V358A Package Information SOP-8 March 2021-REV_V0 10/11 LMV321A/V358A SOT23-5 March 2021-REV_V0 11/11