INA2137UA Integrated Circuits (ICs)

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1. Describe

INA137 and INA2137UA are differential line receivers composed of high-performance operational amplifiers with on-chip precision resistors. They are fully suitable for high-performance audio applications, and have excellent AC specifications, including low distortion (0.0005% at 1kHz) and high slew rate (14V/µs) to ensure good dynamic response. In addition, the wide output voltage swing and high output drive capability allow it to be used in a variety of demanding applications. The dual version has a completely independent circuit, even in the case of overload or overload, the lowest crosstalk and no interaction can be achieved. The on-chip resistors of INA137 and INA2137 are laser trimmed to obtain accurate gain and best common mode rejection. In addition, the excellent TCR tracking of the resistor maintains gain accuracy and common-mode rejection over the entire temperature range. It is guaranteed to work within the range of ±4V to ±18V (8V to 36V total power supply). INA137 provides 8-pin DIP and SO-8 Surface mount package. INA2137 is here 14-pin DIP and SO-14 surface mount packages. Both Designated for extended industry Temperature range, –40°C to +85°C.

2. Feature

    1. Single version and dual version

    2. Low distortion: 0.0005% at f = 1kHz

    3. High slew rate: 14V/µs

    4. Fast setup time: 3µs to 0.01%

    5. Wide power supply range: ±4V to ±18V

    6. Low quiescent current: 2.9mA maximum

    7. High common mode rejection ratio: 90dB

    8. Fixed gain = ±6dB

    9. Package—Single: 8-pin DIP, SO-8

                       Double: 14-pin DIP, SO-14

3. PIN CONFIGURATIONS

4. Application

    1. Audio differential line receiver

    2. G = 1/2 or G = 2 amplifier

    3. Instrument blocks

    4. Current shunt monitor

    5. Voltage controlled current source

    6. Ground loop eliminator

5. Application information

INA137 and INA2137 are differential line receivers Suitable for a wide range of audio and general purpose application. Input and feedback The resistor can be inverted to achieve G = 2 (+6dB), for applications that require G = 1 (0dB), It is recommended to use INA134 and INA2134. For applications with noisy or high impedance power supplies, it is strongly recommended to use decoupling capacitors. This The capacitor should be placed close to the device pins, because all circuits are completely independent In the dual version that ensures the lowest crosstalk and normal The behavior when an amplifier is overloaded or short-circuited. The differential input signal is connected to pins 2 and 3. The source impedance is connected to The inputs must be almost equal to ensure good common mode rejection. A 5Ω mismatch in the source impedance will Degrade the common mode rejection of typical devices to About 77dB (RTO). If the source is known Impedance mismatch, an additional resistor in series The opposite input can be used to maintain good common-mode rejection.

6. Audio performance

INA137 and INA2137 are designed for enhanced AC Performance. Extremely low distortion, low noise and wide bandwidth provide excellent performance in high-quality audio application. Laser trimming matching resistance provides the best common mode rejection (usually 90dB), especially Compared with a circuit implemented using an operational amplifier And discrete precision resistors. In addition, high conversion rate (14V/µs) and fast settling time (3µs to 0.01%) ensure excellent dynamic performance. INA137 and INA2137 have excellent distortion characteristics. THD+ noise in the entire audio is less than 0.001% Frequency Range. Up to about 10kHz distortion is It is lower than the measurement limit of commonly used test equipment. In addition, the distortion remains relatively flat in its range Wide output voltage swing range.

7. Offset voltage adjustment

INA137 and INA2137 are laser trimmed to achieve low offset Voltage and drift. Most applications do not require external offset adjust. Output refers to output Reference terminal (pin 1), usually grounded. One The voltage applied to the Ref terminal will be the same as output signal. This can be used to eliminate the offset voltage, the source impedance of the applied signal To the Ref terminal should be less than 10Ω to maintain good Common mode rejection.

8. INA105 Differential Amplifier Application

    1. Current receiver compliant with Rails

    2. ±10V precision voltage reference

    3. ±5V precision voltage reference

    4. Precision average amplifier

    5. Precision bipolar bias

    6. Precision summing amplifier with gain

    7. Instrumentation amplifier protection drive generator

    8. Precision summing instrumentation amplifier

    9. Precision absolute value buffer

  10. Precision voltage-current converter with differential input

  11. Differential input voltage current converter for low IOUT

  12. Isolated current source

  13. Ision Voltage-Controlled Current Source with Buffered Differential Inputs and Gain