FEATURES

3 MHz Sample Rate, 14-Bit Resolution

Zero Latency

Unipolar, Pseudo Differential Input, Range:

− 0 V to 2.5 V

High Speed Parallel Interface

78 dB SNR and 88.5 dB THD at 3 MSPS

Power Dissipation 85 mW at 3 MSPS

Nap Mode (10 mW Power Dissipation)

Power Down (10
W)

Internal Reference

Internal Reference Buffer

8-/14-Bit Bus Transfer

48-Pin TQFP Package

APPLICATIONS

Optical Networking (DWDM, MEMS Based

Switching)

Spectrum Analyzers

High Speed Data Acquisition Systems

High Speed Close-Loop Systems

Telecommunication

Ultra-Sound Detection

DESCRIPTION

The ADS7891 is a 14-bit 3-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 parallel interface

with an additional byte mode that provides easy interface with 8-bit processors. 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. With nap mode enabled, the device operates at lower power when

used at lower conversion rates. The device is available in a 48-pin TQFP package.