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