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.