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ADS7890IPFBT
2.7V-5.25V Digital, 5V Analog, 14 Bit, 1.25 MSPS, Serial ADC w/Ref
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SLAS409 − DECEMBER 2003
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FEATURES 1.25 MHz Sample Rate, 14-Bit Resolution Zero Latency Unipolar, Pseudo Differential Input, Range:
− 0 V to 2.5 V SPI� Compatible Serial Interface 77.5 dB SNR and −95 dB THD at 0.5 MHz I/P Power Dissipation 45 mW at 1.25 MSPS Nap Mode (10 mW Power Dissipation) Power Down (10 �W) Internal Reference Internal Reference Buffer 48-Pin TQFP Package
APPLICATIONS Optical Networking (DWDM, MEMS Based
Switching) Spectrum Analyzers High Speed Data Acquisition Systems High Speed Close-Loop Systems Telecommunication
DESCRIPTIONThe ADS7890 is a 14-bit 1.25-MSPS A-to-D converter with 2.5-V internal reference. The device includes a
capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit serial SPI or DSP
compatible interface. The device has a pseudo-differential input stage.
The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor
and also to cancel common-mode noise. The device operates at lower power when used at lower conversion
rates because of the nap feature. The device is available in a 48-pin TQFP package.
SDO
SCLK
BUSY
PWD/RST
+IN
−IN
REFIN
REFOUT
