ZJA3601、ZJA3619

  ZJA3601、ZJA3619  8 nV/√Hz Noise, RRO, Precision Instrumentation Amplifier.pdf

| Features

| Applications

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Smart grid	Communication systems	Industrial control
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Precision data acquisition	Instrumentation	Sensor signal conditioning

| General Description

The ZJA3601/3619 is a precision, low-noise instrumentation amplifier that can be used to set the gain range from 1 to 10,000 with a single external resistor.

The ZJA3601/3619 is based on classic three-op-amp structure to provide high common-mode rejection ratio (CMRR) over 120 dB at a gain of 10. This allows it to accurately amplify useful signals in the presence of large external interference, which is a common situation in precision data acquisition, bridge sensor interface, thermocouples, and medical signal acquisition (such as ECG, EEG, etc.). The ZJA3601/3619 also guarantees a CMRR of over 95 dB (G = 1，Grade B) over a temperature range of -40 °C to +125 °C, providing a solid foundation for applications requiring guaranteed performance over a wide temperature range. This is an outstanding feature of the ZJA3601/3619.

The ZJA3601/3619 has both excellent DC and AC performances. Its input offset voltage is better than 25 µV （Grade B）, its drift is typically 0.3 µV/°C, and its input bias current is around 5 pA. This simplifies system calibration costs. The noise is 8 nV/√Hz at 1 kHz, and the 0.1 Hz to 10 Hz noise is 2 µV_P-P (G = 1), making it very suitable for the first stage of precision circuits. The ZJA3601/3619 is a rail-to-rail output instrumentation amplifier, which can maximize the use of the ADC input range. The bandwidth is 625 kHz at a gain of 10, the slew rate is 2 V/µs, and the 0.01% settling time is 6.5 µs. This makes it suitable for precision multi-channel switching data acquisition systems.

The ZJA3601/3619 uses an optimized pinout (the gain-setting resistor is connected to pins 2 and 3), which can extend the frequency range of the CMRR, thus improving system performance.

The ZJA3601/3619 perform is specified over a wide temperature range of -40 °C to +125 °C. Its supply voltage is from ±2.4 V to ±18 V.  The ZJA3601/3619 is available in 8-lead SOIC and MSOP packages.

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