AD7984| Datasheet

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18-Bit, 1.33 MSPS PulSAR 10.5 mW ADC in MSOP/QFN AD7984
FEATURES
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-/QSPITM-/MICROWIRETM-/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 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

Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit PulSAR ADC
Type 14-Bit 16-Bit 100 kSPS AD7940 AD7680 AD7683 AD7684 250 kSPS AD79421 AD76851 AD76871 AD7694 AD7691 1 400 kSPS to 500 kSPS AD79461 AD76861 AD76881 AD76931 AD76901 1000 kSPS AD79801 AD79831 AD79821 AD79841 ADC Driver ADA4941-x ADA4841-x ADA4941-x ADA4841-x

18-Bit

Pin-for-pin compatible.

Rev. 0
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06973-001

ADA4941

3- OR 4-WIRE INTERFACE (SPI, CS DAISY CHAIN)