ADC GX7793 Replaces AD7793 for Digital Voltmeter Applications

Microprocessor-based intelligent digital voltmeter DVM with its high accuracy, strong anti-interference ability, scalability, easy integration, but also real-time communication with the PC and other advantages, it is the use of digital measurement technology, the continuous analogue quantities are converted into discontinuous, discrete digital form and display the instrument.

The GXSC high-resolution 24-bit analogue-to-digital converter GX7793 provides the digital voltmeter with sufficient precision to accurately measure voltage values. When measuring small voltage variations, the high resolution can reflect voltage differences in greater detail, thus improving the accuracy of the measurement. The chip contains three differential analogue inputs and also integrates an on-chip low-noise instrumentation amplifier, thus allowing small signals to be input directly.

The GX7793‘s rms noise is only 38nV at 4.17Hz and 79nV at 16.7Hz. The low noise feature helps to reduce interference in measurements, making them more stable and reliable, and thus improving the accuracy of digital voltmeter


measurements in different environments. The chip is powered by a 2.7V to 5.25V supply and is available in a 16-pin TSSOP package.

- Supports 15 update rates: 4.17Hz to 940Hz

- 3-channel differential signal input

- Built-in low noise amplifier

- Gain steps 0.5/1/2/4/8/16/32/64/128 times selectable

- Built-in RCO circuit, frequency default 64K; built-in programmable current source; built-in bias voltage generator

- GX7793 can be PIN to PIN replacement of AD7793, there are certain price advantages

- SPI communication interface

Support standard 3-wire SPI interface

Support up to 5M SCLK communication clock

Support CRC and XOR checksum