DESCRIPTION The AD7641 is an 18-bit, 2 MSPS, charge redistribution SAR, fully differential, analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. The part contains a high speed, 18-bit sampling ADC, an internal conversion clock, both serial and parallel system interface ports. It features two very high sampling rate modes (wideband warp and warp) and a fast mode (normal) for asynchronous rate applications. The AD7641 is hardware factory calibrated and tested to ensure ac parameters, such as signal-to-noise ratio (SNR), in addition to the more traditional dc parameters of gain, offset, and linearity. The AD7641 is available in Pb-free only packages with operation specified from 40 C to +85 C. FUNCTIONAL BLOCK DIAGRAM 04761-00118CONTROLLOGICANDCALIBRATIONCIRCUITRYCLOCKAD7641DGNDDVDDAVDDAGNDREFREFGNDIN+IN-PDRESETCNVSTPDBUFREFBUFINPDREFREFTEMPBUSYRDCSD0/OB/2COGNDOVDDMODE1MODE0REFAMPNORMALSERIALPORTPARALLELINTERFACESWITCHEDCAPDACWARP Figure 1. Table 1. PulSAR Sel 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 REF (VREF up 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 W 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 ATE GENERAL DESCRIPTION The AD7641 is an 18-bit, 2 MSPS, charge redistribution SAR, fully differential, analog-to-digital conv Specifications subject to change without notic