AD7944

14位， 2.5 MSPS ， 15.5的PulSAR ADC毫瓦的LFCSP 14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP

Product Details

The is a 14-bit, 2.5 MSPS successive approximation analog-to-digital converter SAR ADC. It contains a low power, high speed, 14-bit sampling ADC, an internal conversion clock, an internal reference and buffer, error correction circuits, and a versatile serial interface port. On the rising edge of CNV, the AD7944 samples an analog input, IN+, between 0 V and VREF with respect to a ground sense, IN−. The AD7944 features a very high sampling rate turbo mode TURBO high and a reduced power normal mode TURBO low for low power applications where the power is scaled with the throughput.

In normal mode TURBO low, 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 provide an optional busy indicator. The serial interface is compatible with 1.8 V, 2.5 V, and 2.7 V supplies using the separate VIO supply.

The AD7944 is available in a 20-lead LFCSP with operation specified from −40°C to +85°C.

**Applications**

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Battery-powered equipment

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Communications

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ATE

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Data acquisition systems

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Medical instruments

### Features and Benefits

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14-bit resolution with no missing codes

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Throughput: 2.5 MSPS TURBO high, 2.0 MSPS TURBO low

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Low power dissipation

15.5 mW at 2.5 MSPS, with external reference 

28 mW at 2.5 MSPS, with internal reference

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INL: ±0.25 LSB typical, ±1.0 LSB maximum

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SNR

84 dB, with on-chip reference 

84.5 dB, with external reference

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4.096 V internal reference: typical drift of ±10 ppm/°C

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Pseudo differential analog input voltage range

0 V to VREF with VREF up to 5.0 V

Allows use of any input range

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No pipeline delay

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Logic interface: 1.8 V/2.5 V/

2.7 V

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Serial interface: SPI-/QSPI-/MICROWIRE-/

DSP-compatible

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Ability to daisy-chain multiple ADCs with busy indicator

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20-lead, 4 mm × 4 mm LFCSP QFN