Analog Devices Inc. AD7989-1BRMZ

Description
The AD7989-1/AD7989-5 are 18-bit, successive approximation, analog-to-digital converters (ADCs) that operate from a single power supply, VDD. They contain a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7989-1/AD7989-5 sample the voltage difference between the IN and IN- pins. The voltages on these pins usually swing in opposite phases between 0 V and Vier. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.
The AD7989-1/AD7989-5 are serial peripheral interface (SPI) compatible, which features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus. It is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.
The AD7989-1/AD7989-5 are available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from -40°C to 85°C.

Features
Low power dissipation
AD7989-1: 400 μW at 100 kSPS (VDD only), 700 μW at 100 kSPS (total)
AD7989-5: 2 mW at 500 KSPS (VDD only), 3.5 mW at 500 kSPS (total)
18-bit resolution with no missing codes
Throughput: 100 kSPS (AD7989-1)/500 kSPS (AD7989-5)
INL: ±1 LSB typical, 2 LSB maximum
SNR: 98 dB at 1 kHz, Vaer = 5V
SINAD: 97 dB at 1 kHz
THD: -120 dB at 10 kHz
Dynamic range: 99 dB, V = 5 V
True differential analog input range: ±VRE0V to Ver with VR between 2.4 V and 5.1 V
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface

Applications
Battery-powered equipment
Data acquisition systems
Medical instruments
Seismic data acquisition systems