AD7944 14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP _ BDTIC a Leading Distributor in China

AD7944 14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP

The AD7944 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

Battery-powered equipment
Communications
ATE
Data acquisition systems
Medical instruments

Features and Benefits

14-bit resolution with no missing codes
Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low)
Low power dissipation
15.5 mW at 2.5 MSPS, with external reference
28 mW at 2.5 MSPS, with internal reference
INL: ±0.25 LSB typical, ±1.0 LSB maximum
SNR
84 dB, with on-chip reference
84.5 dB, with external reference
4.096 V internal reference: typical drift of ±10 ppm/°C

Pseudo differential analog input voltage range
0 V to V_REF with V_REF up to 5.0 V
Allows use of any input range
No pipeline delay
Logic interface: 1.8 V/2.5 V/
2.7 V
Serial interface: SPI-/QSPI-/MICROWIRE-/
DSP-compatible
Ability to daisy-chain multiple ADCs with busy indicator
20-lead, 4 mm × 4 mm LFCSP (QFN)