16-Bit Lower Power PulSAR ADCs in MSOP/LFCSP

The AD7988-1/AD7988-5 are 16-bit, successive approximation, analog-to-digital converters (ADC) that operate from a single power supply, VDD. The AD7988-1 offers a 100 kSPS throughput, and the AD7988-5 offers a 500 kSPS throughput. They are low power, 16-bit sampling ADCs with a versatile serial interface port. On the CNV rising edge, they sample an analog input, IN+, between 0 V to VREF with respect to a ground sense, IN−. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD.

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

The AD7988-1/AD7988-5 generics are housed in a 10-lead MSOP or a 10-lead 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 from 2.5 V to 5.0 V

* Throughput: 500 kSPS/100 kSPS options 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