FEATURES
a71 SELF-CALIBRATING
a71 HIGH SFDR: 85dB at NYQUIST
a71 HIGH SNR: 76dB
a71 LOW POWER: 250mW
a71 DIFFERENTIAL OR SINGLE-ENDED INPUTS
a71 +3V/+5V LOGIC I/O COMPATIBLE
a71 FLEXIBLE INPUT RANGE
a71 OVER-RANGE INDICATOR
a71 INTERNAL OR EXTERNAL REFERENCE
APPLICATIONS
a71 IF AND BASEBAND DIGITIZATION
a71 CCD IMAGING SCANNERS
a71 TEST INSTRUMENTATION
a71 IR IMAGING
DESCRIPTION
The ADS850 is a high dynamic range, 14-bit Analog-to-Digital
Converter (ADC) that utilizes a fully differential input, allowing for
either single-ended or differential input interface over varying
input spans. This converter features digital error correction tech-
niques ensuring 14-bit linearity and a calibration procedure that
corrects for capacitor and gain mismatches. The ADS850 also
includes a high-bandwidth track-and-hold that provides excellent
spurious performance up to and beyond the Nyquist rate.
The ADS850 provides an internal reference that can be pro-
grammed for a 2Vp-p input range for the best spurious perfor-
mance and ease of driving. Alternatively, the 4Vp-p input range
can be used for the lowest input referred noise, offering
superior signal-to-noise performance for imaging applications.
There is also the capability to set the range between 2Vp-p and
4Vp-p, or to use an external reference. The ADS850 also
provides an over-range indicator flag to indicate if the input has
exceeded the full-scale input range of the converter.
The low distortion and high signal-to-noise performance pro-
vide the extra margin needed for communications, imaging,
and test instrumentation applications. The ADS850 is available
in a TQFP-48 package.
14-Bit
Pipelined
ADC Core
Reference and
Mode Select
Reference Ladder
and Driver
Timing Circuitry
Error
Correction
Logic
and
Calibration
Circuitry
3-State
Outputs
T&H
D0
D13
•
•
•
CLK+V
S
ADS850
VDRV
OESEL REFBV
REF
REFT
INV
IN
IN
(Opt.)
CM
OVR
14-Bit, 10MSPS Self-Calibrating
ANALOG-TO-DIGITAL CONVERTER
ADS850
SBAS154C – OCTOBER 2000 – REVISED OCTOBER 2002
www.ti.com
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
ADS850