ADI AD7984BRMZ-RL7

The AD7984 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 0V and VREF. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. 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, and 5 V logic, using the separate VIO supply. The AD7984 is available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from -40°C to +85°C.

• 18-bit resolution with no missing codes
• Throughput: 1.33 MSPS
• Low power dissipation: 10.5 mW at 1.33 MSPS
• INL: ±2.25 LSB maximum
• Dynamic range: 99.7 dB typical
• True differential analog input range: ±VREF 0 V to VREF with VREF between 2.9 V to 5.0 V Allows use of any input range Easy to drive with the ADA4941
• No pipeline delay
• Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
• Proprietary serial interface SPI/QSPI/MICROWIRE/DSP compatible
• Ability to daisy-chain multiple ADCs and busy indicator
• 10-lead MSOP (MSOP-8 size) and 10-lead 3 mm×3 mm LFCSP, SOT-23 size

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