AD7984

18-Bit, 1.33 MSPS PulSAR 10.5 mW ADC in MSOP/QFN AD7984 FEATURES www.datasheet4u.com 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 APPLICATION DIAGRAM 2.9V TO 5V 2.5V IN+ REF VDD VIO SDI SCK SDO GND CNV 1.8V TO 5V ±10V, ±5V, .. AD7984 IN– Figure 1. GENERAL DESCRIPTION The AD7984 is an 18-bit, successive approximation, analog-todigital 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 indicat...