D769AD

GENERAL DESCRIPTION

The AD76901 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.

FEATURES

18-bit resolution with no missing codes
Throughput: 400 kSPS
INL: ±0.75 LSB typical, ±1.5 LSB maximum (±6 ppm of FSR)
Dynamic range: 102 dB at 400 kSPS
Oversampled dynamic range: 125 dB at 1 kSPS
Noise-free code resolution: 20 bits at 1 kSPS
Effective resolution: 22.7 bits at 1 kSPS
SINAD: 101.5 dB at 1 kHz
THD: −125 dB at 1 kHz
True differential analog input range: ±VREF
0 V to VREF with VREF 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
Proprietary serial interface
SPI/QSPI/MICROWIRE™/DSP compatible
Daisy-chain multiple ADCs and busy indicator
Power dissipation
4.25 μW at 100 SPS
4.25 mW at 100 kSPS
Standby current: 1 nA
10-lead package: MSOP (MSOP-8 size) and
3 mm × 3 mm LFCSP (SOT-23 size)
Pin-for-pin compatible with LFCSP/MSOP PulSAR ADCs

APPLICATIONS

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