AD7984 Datasheet | Analog Devices

18-Bit, 1.33 MSPS Pul SAR 10.5 m W ADC in MSOP/QFN AD7984 Features .. 18-bit resolution with no missing codes Throughput: 1.33 MSPS Low power dissipation: 10.5 m W at 1.33 MSPS INL: ±2.25 LSB maximum Dynamic range: 99.7 d B 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-patible 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, .. 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-patible 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 patible 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 Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit Pul SAR® ADC Type 14-Bit 16-Bit 100 k SPS AD7940 AD7680 AD7683 AD7684 250 k SPS AD79421 AD76851 AD76871 AD7694 AD7691 1 400 k SPS to 500 k...