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.