FEATURES
4 MHz Sample Rate, 12-Bit Resolution
Zero Latency
Unipolar, Pseudo Differential Input, Range:
− 0 V to 2.5 V
High Speed Parallel Interface
71 dB SNR and −88.5 dB THD at 1 MHz I/P
Power Dissipation 95 mW at 4 MSPS
Nap Mode (10 mW Power Dissipation)
Power Down (10
W)
Internal Reference
Internal Reference Buffer
48-Pin TQFP and QFN Packages

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 ADS7881 is a 12-bit 4-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 12-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 48-pin
TQFP and QFN packages.