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

The AD7982 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. The AD7982 contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7982 samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

The serial peripheral interface (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. The AD7982 is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.

The AD7982 is available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +85°C.

Applications

* Automated test equipment

* Data acquisition systems

* Medical instruments

* Machine automation

* High performance

* True differential analog input range: ±VREF

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

* Easy to drive with the ADA4941-1 or ADA4940-1

* Throughput: 1 MSPS

* Zero latency architecture

* 18-bit resolution with no missing codes

* INL: ±1 LSB typical, ±2 LSB maximum

* Dynamic range: 99 dB, VREF = 5 V

* SNR: 98 dB at fIN = 1 kHz, VREF = 5 V

* THD: −119 dB at fIN = 1 kHz, VREF = 5 V

* SINAD: 97 dB at fIN = 1 kHz, VREF = 5 V