Analog Devices’ AD7177-2 32-bit ΣΔ ADC, in distribution

May 11, 2015 // By Graham Prophet
Mouser Electronics has the AD7177-2 32-bit sigma delta analog to digital converter (ADC) from Analog Devices. AD7177-2 is a low noise 32-bit sigma delta (Σ-Δ) ADC with a true rail-to-rail input buffer and flexible scan rates.

This 32-bit ADC can be configured as two fully differential, or four single-ended, analogue inputs with a channel scan rate of 10 ksamples/sec. The AD7177-2 is designed to operate as a fast settling, very high resolution, Σ-Δ ADC with high levels of configurability.

Intended for applications that require the measurement of very high precision analogue data, the AD7177-2 can also be configured for 24-bit resolution, which provides faster conversion speeds. The AD7177-2 has four independent channels with four independent setups. Developers can select any of the analogue input pairs on any channel, as well as any of the four setups for any channel, providing full flexibility in the channel configuration. This also allows per channel configuration when using differential inputs, as well as single-ended inputs. A precision 2.5V low drift (2 ppm/°C) band gap internal reference with output reference buffer reduces external component count.

Integrated true rail-to-rail buffers on the analogue inputs and external reference inputs allow the ADC to drive high impedance inputs. An SPI interface allows configuration of many of the ADC options including 32- or 24-bit resolution, power down modes, gain, offset calibration values, conversion delay, and enabling the internal temperature sensor. This ADC is specified over the extended industrial temperature range of -40°C to +105°C.

The AD7177-2 can be used in a variety of applications that require high resolution and accuracy, such as medical instrumentation, industrial PLC modules, and high precision data acquisition systems.