ADHV4702-1, a high-precision operational amplifier that can directly input 220V

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Precision operational amplifier ADHV4702-1 capable of direct 220V input

Applications such as high-side current sensing, high-voltage drivers, ATE (automated test equipment), and LiDAR require high-voltage analog circuits exceeding tens of volts.
High-voltage analog circuits have previously been achieved using discrete transistor circuits, but these have posed challenges such as the high cost of components, the difficulty of miniaturizing the circuits, and heat generation.

The ADHV4702-1 from Analog Devices is a high-voltage, high-precision operational amplifier that solves these challenges through the company's proprietary next-generation semiconductor process and innovative architecture.

This article introduces the following four features of the ADHV4702-1.

Low noise measurement of high voltage signals with few parts
Drives signal outputs up to 220V without expensive discrete transistor circuits
Thermal protection with internal temperature sensor and shutdown function (thermal shutdown)
Small package with EC61010-1 compliant pinout

Low noise measurement of high voltage signals with few parts

The ADHV4702-1 is designed using Analog Devices' proprietary next generation bipolar/complementary metal-oxide semiconductor (CMOS)/laterally diffused metal-oxide semiconductor (BCDMOS) process.

These technologies enable the ADHV4702-1 to realize high-voltage, high-precision analog circuits with a small number of components.
The functional block diagram of the ADHV4702-1 is shown below.

Functional block diagram of ADHV4702-1 (Source: Excerpt from ADHV7402-1 data sheet)

The ADHV4702-1 input stage architecture offers the benefits of low input bias current, low input offset voltage, low drift, and low noise with high input impedance for precision applications such as automatic test equipment (ATE).

The ADHV7402-1 achieves precision performance with an open-loop gain (AOL) of 170 dB (typical) and a common-mode rejection ratio (CMRR) of 160 dB (typical), as shown in the performance graphs below. The ADHV4702-1 also achieves an input offset voltage (VOS) drift of 2 µV/ºC (maximum) and an input voltage noise of 8 nV/√Hz.

High accuracy performance of ADHV7402-1 (Source: Excerpt from ADHV7402-1 data sheet)

Drives signal outputs up to 220V without expensive discrete transistor circuits

The ADHV4702-1 operates from ±110 V symmetrical split supplies, asymmetric split supplies, or a 220 V single supply.
This wide supply voltage range enables high voltage circuits with few external components, as in the typical application circuit below.

ADHV4702-1 typical application circuit (Source: Excerpt from ADHV7402-1 data sheet)

The ADHV4702-1 can also realize the following functions depending on the peripheral circuit configuration.

Voltage Subtractor with High Voltage DAC

In this configuration, the ADHV4702-1 is set up as a voltage subtractor with a gain of 20, making it ideal for bias control in chemical analysis (mass spectrometry), driving piezos, scanning electron microscopes (SEM), LiDAR APD/SPADs, silicon photomultipliers, and more.

Voltage subtractor with ADHV4702-1 and high voltage DAC (Source: Excerpt from ADHV7402-1 datasheet)

high current output driver

By implementing a unity gain output stage using discrete components, the ADHV47021 can be used as a high power output driver.
The output current drive can be amplified to the currents that can be handled by discrete products while maintaining the precision performance of the amplifier alone, such as offset, drift, open-loop gain, and CMRR.

Thermal protection with internal temperature sensor and shutdown function (thermal shutdown)

Operating an IC at temperatures above its absolute maximum rating may affect product reliability.

To minimize this risk, the ADHV4702-1 features a resistor adjustable thermal shutdown option.

The ADHV4702-1 is disabled and enters a low power state when the voltage on the SD pin drops to within 0.8 V of DGND, reducing the quiescent current to approximately 0.18 mA.

In addition, the temperature information output as a voltage to the TMP pin indicates the approximate temperature of the IC chip, so it can also be used to monitor power consumption. By performing a one-time calibration of the TMP pin at room temperature, the temperature can be measured more accurately.
The graph below shows the relationship between the TMP pin voltage and the junction temperature.

ADHV4702-1 TMP pin voltage versus junction temperature (Source: Excerpt from ADHV7402-1 datasheet)

As shown in the following circuit diagram, the thermal shutdown function can be realized by connecting TMP and SD and connecting a 200kΩ resistor (RTMP) between TMP and SD and DGND as close as possible to the ADHV4702-1.

ADHV4702-1 Configuration for Short-Circuit Protection and Thermal Shutdown (Source: Excerpt from ADHV7402-1 Datasheet)

Small package with IEC61010-1 compliant pinout

The ADHV4702-1 has a package configuration that complies with IEC61010-1, a safety standard related to measuring instruments.
In addition, the package size is 7mm x 7mm (LFCSP), contributing to miniaturization and multi-channelization of circuits.