OPA171AIDBVT

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1. Description

The OPA171AIDBVT, OPA2171, and OPA4171 (OPAx171) are a family of 36-V, single-supply, low-noise operational amplifiers with the ability to operate on supplies ranging from 2.7 V (±1.35 V) to 36 V (±18 V). These devices are available in micro-packages and offer low offset, drift, and bandwidth with low quiescent current. The single, dual, and quad versions all have identical specifications for maximum design flexibility. Unlike most operational amplifiers, which are specified at only one supply voltage, the OPAx171 family is specified from 2.7 to 36 V. Input signals beyond the supply rails do not cause phase reversal. The OPAx171 family is stable with capacitive loads up to 300 pF. The input can operate 100 mV below the negative rail and within 2 V of the top rail during normal operation. These devices can operate with full rail-to-rail input 100 mV beyond the top rail, but with reduced performance within 2 V of the top rail. The OPAx171 series of operational amplifiers are specified from –40°C to +125°C.

2. Features

    1. Supply range: 2.7 to 36 V, ±1.35 V to ±18 V

    2. Low noise: 14 nV/√Hz

    3. Low offset drift: ±0.3 µV/°C (typical)

    4. RFI filtered inputs

    5. Input range includes the negative supply

    6. Input range operates to positive supply

    7. Rail-to-rail output

    8. Gain bandwidth: 3 MHz

    9. Low quiescent current: 475 µA per amplifier

  10. High common-mode rejection: 120 dB (typical)

  11. Low-input bias current: 8 pA

  12. Industry-standard packages:

        – 8-pin SOIC

        – 8-pin MSOP

        – 14-pin TSSOP

  13. Micro packages:

        – Single in SOT-553 

        – Dual in VSSOP-8

3. Applications

    1. Tracking amplifier in power modules

    2. Merchant power supplies

    3. Transducer amplifiers

    4. Bridge amplifiers

    5. Temperature measurements

    6. Strain gauge amplifiers

    7. Precision integrators

    8. Battery-powered instruments

    9. Test equipment

4. Pin Configuration 

5. Pin Functions

6. Function description

1. Operating characteristics

The rated operating voltage range of OPAx171 series amplifiers is 2.7 to 36 V (±1.35 to ±18 V). many Specifications apply from –40°C to +125°C. Parameters that may show significant differences Typical characteristics provide operating voltage or temperature

2. Common mode voltage range

The input common-mode voltage range of the OPAx171 series is extended to 100 mV below the negative rail, and Within 2 V of the top rail in normal operation. The series can be operated at a full rail-to-rail input 100 mV beyond the top rail, but in 2 V top rail. Typical performance in this range is summarized in Table 2.

3. Reverse protection

The OPAx171 series has internal reverse phase protection. Many op amps exhibit phase Reverse when the input is driven beyond its linear common mode range. This situation is most common When the input is driven beyond the specified common-mode voltage range, encountered in the non-inverting circuit, Causes the output to reverse to the opposite track. OPAx171 input prevents phase reversal The common mode voltage is too high. Instead, the output is limited to the appropriate track.

4. Capacitive load and stability

The dynamic characteristics of OPAx171-Q1 series devices have been targeted at common The operating conditions encountered. The combination of low closed-loop gain and high capacitive load reduces The phase margin of the amplifier may cause gain peaks or oscillations. Therefore, the heavier capacitor The load must be isolated from the output. The easiest way to achieve this isolation is to add a small resistor in series with the output.

7. Application Information

The OPAx171 operational amplifiers provide high overall performance, and are designed for many generalpurpose applications. The excellent offset drift of only 2 µV/°C provides excellent stability over the entire temperature range. In addition, the series offers good overall performance with high CMRR, PSRR, and AOL. As with all amplifiers, applications with noisy or high-impedance power supplies require decoupling capacitors close to the device pins. In most cases, 0.1-µF capacitors are adequate.