Replacing the AD7980, the GX7980 16-bit 1MSPS SAR analog-to-digital converter is widely used in machine automation.

In machine automation, whether it is position feedback in multi-axis motion control or sensor signal acquisition in high-speed sorting systems, the control system needs to obtain exact measurement values within a determined time window. The successive approximation architecture inherently features zero latency: the conversion result is available immediately after conversion is complete, with no multi-cycle data delay. This means that after the controller issues a conversion command, it does not need to estimate or compensate for the phase lag caused by pipeline delay, greatly simplifying the timing design of the control loop.

The GX7980 16-bit SAR analog-to-digital converter is powered by a single supply and integrates a low-power, high-speed, 16-bit sampling ADC and a multifunction serial interface port. On the rising edge of CNV, the device samples the analog input voltage difference between IN+ and IN-, ranging from 0 V to REF. The reference voltage (REF) is provided externally and can be independent of the supply voltage (VDD).

GX7980 features:

Differential nonlinearity: ±0.8 LSB

Integral nonlinearity: ±2.0 LSB

Signal-to-noise and distortion ratio: 86 dB @ 1 kHz

Total harmonic distortion: -100 dB @ 1 kHz

External reference: 2.5 V–5 V selectable

Single analog supply VDD: 2.5 V

Logic interface supply VIO: 1.8 V–5.5 V

SPI serial interface

10-lead 3 mm × 3 mm DFN package

Power consumption: 7.7 mW @ Fs = 1 MSPS

Standby current: 50 nA

As automation equipment becomes increasingly feature-rich while control cabinet space and thermal budget remain relatively fixed, the power consumption of the GX7980 scales linearly with throughput rate, with total power consumption of only 7.7 mW at full-speed operation at 1 MSPS. This characteristic of power consumption scaling linearly with throughput rate stems from its automatic shutdown mechanism after conversion is complete. For battery-powered mobile robots or distributed sensor nodes, microwatt-level power consumption at low sampling rates means longer endurance and simplified thermal management.