GENERAL DESCRIPTION

The AD79841 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 and a versatile serial interface port. On the CNV rising edge, the AD7984 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, REF, is applied externally and can be set independent of the supply voltage, VDD.

FEATURES

High performance

True differential analog input range: ±VREF

0 V to VREF with VREF between 2.9 V to 5 V

Easy to drive with the ADA4941

Throughput: 1.33 MSPS

Zero latency architecture

18-bit resolution with no missing codes

INL: ±2.25 LSB maximum

Dynamic range: 99.7 dB, VREF = 5 V

SNR: 98.5 dB at fIN = 1 kHz, VREF = 5 V

THD: −110.5 dB at fIN = 1 kHz, VREF = 5 V

SINAD: 97.5 dB at fIN = 1 kHz, VREF = 5 V

Low power dissipation

Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V

logic interface

5.3 mW at 1.33 MSPS (VDD only)

10.5 mW at 1.33 MSPS (total)

80 μW at 10 kSPS

Proprietary serial interface

SPI/QSPI/MICROWIRE™/DSP compatible

Ability to daisy-chain multiple ADCs and busy indicator

10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP

Wide operating temperature range: −40°C to +85°C

APPLICATIONS

Automated test equipment

Data acquisition systems

Medical instruments

Machine automation