LMV841QMG/NOPB

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1. Description

The LMV841QMG/NOPB devices are low-voltage and lowpower operational amplifiers that operate with supply voltages ranging from 2.7 V to 12 V and have rail-torail input and output capability. Their low offset voltage, low supply current, and CMOS inputs make them ideal for high impedance sensor interface and battery-powered applications. The single LMV841-Q1 is offered in the space-saving 5-pin SC70 package, the dual LMV842-Q1 in the 8- pin VSSOP and 8-pin SOIC packages, and the quad LMV844-Q1 in the 14-pin TSSOP and 14-pin SOIC packages. These small packages are ideal solutions for area-constrained PCBs and portable electronics. The LMV841-Q1, LMV842-Q1, and LMV844-Q1 incorporate enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard.

2. Features

    1. AEC-Q100 Automotive Qualification Test Guidance With the Following:

        – Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature

        – Device HBM ESD Classification Level 2

        – Device CDM ESD Classification Level C3

    2. Unless Otherwise Noted, Typical Values at TA = 25 °C, V + = 5 V.

    3. Small 5-Pin SC70 Package (2.00 mm × 1.25 mm × 0.95 mm)

    4. Wide Supply Voltage Range: 2.7 V to 12 V

    5. Specified Performance at 3.3 V, 5 V and ±5 V

    6. Low Supply Current: 1 mA Per Channel

    7. Unity Gain Bandwidth: 4.5 MHz

    8. Open-Loop Gain: 133 dB

    9. Input Offset Voltage: 500 µV Maximum

  10. Input Bias Current: 0.3 pA

  11. CMRR at 112 dB and PSSR at 108 dB

  12. Input Voltage Noise: 20 nV/√Hz

  13. Temperature Range: −40°C to 125°C

  14. Rail-to-Rail Input and Output (RRIO)

3. Applications

    1. High Impedance Sensor Interface

    2. Battery-Powered Instrumentation

    3. High Gain and Instrumentation Amplifiers

    4. DAC Buffers and Active Filters

4. Pin Configuration

5. Pin Functions

6. Function description

1. input protection

The LMV84x-Q1 devices have a set of anti-parallel diodes D1 and D2 between the input pins. These diodes are used to protect the input stage of the amplifier. At the same time, they limit the amount of differential input voltage allowed on the input pins. Differential signals greater than one diode drop can damage the diodes. Differential signals between inputs need to be limited to ±300 mV or input current needs to be limited to ±10 mA.

2. input stage

The input stage of this amplifier consists of PMOS and NMOS input pairs for rail-to-rail input Scope. For input voltages close to the negative rail, only the PMOS pair is active. close to the track, only NMOS pair is active. In the transition region from about 2 V below V+ to 1 V below V+, both pairs are active, and one gradually replaces the other. In this transition region, the input reference offset voltage changes from the offset voltage associated with the PMOS pair to the offset voltage for the NMOS pair. Input pairs independently adjusted to ensure input offset voltage is less than 0.5 mV at room temperature Full rail-to-rail input range. This also significantly improves the CMRR of the amplifier in transitions area.