Analog Devices Inc. AD7690BRMZ

Description
The AD7690 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN and IN- pins. The voltages on these pins swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage. The power of the AD7690 scales linearly with the 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 VIO supply. The AD7690 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from -40°C to 85°C.

Features
18-bit resolution with no missing codes
Throughput: 400 KSPS
INL: ±0.75 LSB typ, ±1.5 LSB max (±6 ppm of FSR)
Dynamic range: 102 dB @ 400 kSPS
Oversampled dynamic range: 125 dB @ 1kSPS
Noise-free code resolution: 20 bits @ 1 KSPS
Effective resolution: 22.7 bits @ 1 kSPS
SINAD: 101.5 dB @ 1 kHz
THD: -125 dB @ 1 kHz
True differential analog input range: ±VREF0V to Ver with Ver up to VDD on both inputs
No pipeline delay
Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
Serial interface, SPI"/QSPI/MICROWIRE/DSP compatible
Daisy-chain multiple ADCs and busy indicator
Power dissipation
4.25 μW @ 100 SPS
4.25 mW @ 100 kSPS
Standby current: 1 nA
10-lead package: MSOP (MSOP-8 size) and 3 mm x 3 mm QFN (LFCSP) (SOT-23 size)
Pin-for-pin compatible with QFN/MSOP PulSAR ADCs

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