ADS850 Datasheet, PDF (1/15 Pages) Texas Instruments – 14-Bit, 10MSPS Self-Calibrating ANALOG-TO-DIGITAL CONVERTER

ADS850
ADS850
SBAS154C – OCTOBER 2000 – REVISED OCTOBER 2002
14-Bit, 10MSPS Self-Calibrating
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q SELF-CALIBRATING
q HIGH SFDR: 85dB at NYQUIST
q HIGH SNR: 76dB
q LOW POWER: 250mW
q DIFFERENTIAL OR SINGLE-ENDED INPUTS
q +3V/+5V LOGIC I/O COMPATIBLE
q FLEXIBLE INPUT RANGE
q OVER-RANGE INDICATOR
q INTERNAL OR EXTERNAL REFERENCE
APPLICATIONS
q IF AND BASEBAND DIGITIZATION
q CCD IMAGING SCANNERS
q TEST INSTRUMENTATION
q 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.
+V_S
ADS850
CLK
Timing Circuitry
VDRV
V_IN
IN
T&H
IN
(Opt.)
CM
14-Bit
Pipelined
ADC Core
Error
Correction
Logic
and
Calibration
Circuitry
Reference Ladder
and Driver
Reference and
Mode Select
D0
3-State
Outputs
•••
D13
OVR
REFT
V_REF
SEL REFB
OE
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
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