16-Bit, 1 MSPS, PulSAR ADC in MSOP/LFCSP

The AD7980 is a 16-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 16-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN−. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.

The AD7980 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +125°C.

APPLICATIONS

* Automated test equipment

* Data acquisition systems

* Medical instruments

* Machine automation

* High performance

* Pseudo differential analog input range

* 0 V to VREF with VREF between 2.5 V to 5 V

* Throughput: 1 MSPS

* Zero latency architecture

* 16-bit resolution with no missing codes

* INL: ±0.6 LSB typical, ±1.25 LSB maximum

* Dynamic range: 92 dB, VREF = 5 V

* SNR: 91.5 dB at fIN = 10 kHz, VREF = 5 V

* THD: −114 dB at fIN = 10 kHz, VREF = 5 V

* SINAD: 91 dB at fIN = 10 kHz, VREF = 5 V

* Low power dissipation

* Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface

* 4 mW at 1 MSPS (VDD only)

* 7 mW at 1 MSPS (total)

* 70 μW at 10 kSPS