Product Details
●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 0 V 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 QFN (LFCSP) with operation specified from −40°C to +85°C.
●Applications
● Battery-powered equipment
● Data acquisition systems
● Medical instruments
● Seismic data acquisition systems
●### Features and Benefits
● 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
● 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 QFN (LFCSP), SOT-23 size
