AD7641BCPZRL

18位六百七十○分之二百五十○ kSPS时的PulSAR双极性可编程输入ADC 18-Bit 250/670 kSPS PulSAR Bipolar Programmable Inputs ADC

GENERAL DESCRIPTION

The AD7641 is a 18-bit, 2 MSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates from a single 2.5 V power supply. The part contains a high-speed 18-

bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports. It features a very high sampling rate mode Warp and a fast mode Normal for asynchronous conversion rate applications. The AD7641 is hardware factory calibrated and comprehensively tested to ensure ac parameters

such as signal-to-noise ratio SNR and total harmonic distortion THD in addition to the more traditional dc parameters of gain, offset and linearity. Operation is specified from −40°C to +85°C.

FEATURES

Throughput

   2 MSPS wideband warp and warp mode

   1.5 MSPS normal mode

INL: ±2 LSB typical, ±3 LSB max; ±8 ppm of full scale

18-bit resolution with no missing codes

Dynamic range: 95.5 dB

SNR: 93.5 dB typical @ 20 kHz VREF= 2.5 V

THD: −112 dB typical @ 20 kHz VREF= 2.5 V

2.048 V internal reference: typ drift 10 ppm/°C; TEMP output

Differential input range: ±VREFVREFup to 2.5 V

No pipeline delay SAR architecture

Parallel 18-, 16-, or 8-bit bus and serial 5 V/3.3 V/2.5 V interface

SPI®/QSPI™/MICROWIRE™/DSP compatible

Single 2.5 V supply operation

Power dissipation

   75 mW typical @ 2 MSPS with internal REF

   2 μW in power-down mode

Pb-free, 48-lead LQFP and 48-lead LFCSP_VQ

Speed upgrade of the AD7674, AD7678, AD7679

APPLICATIONS

Medical instruments

High speed data acquisition/high dynamic data acquisition

Digital signal processing

Spectrum analysis

Instrumentation

Communications

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