®
ADS
125
ADS1250
0
For most current data sheet and other product
information, visit www.burr-brown.com
20-Bit Data Acquisition System
ANALOG-TO-DIGITAL CONVERTER
FEATURES
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20 BITS NO MISSING CODES
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18 BITS EFFECTIVE RESOLUTION UP TO
25kHz DATA RATE
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LOW NOISE: 2.8ppm at PGA = 1
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DIFFERENTIAL INPUTS
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INL: 0.002% (MAX)
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PROGRAMMABLE FULL SCALE
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I/O CONTROLLED PGA: 1, 2, 4, 8
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EXTERNAL REFERENCE
DESCRIPTION
The ADS1250 is a precision, wide dynamic range,
delta-sigma, analog-to-digital converter with 20-bit
resolution operating from a single +5V supply. The
delta-sigma architecture is used for wide dynamic
range and to guarantee 20 bits of no missing code
performance. An effective resolution of 18 bits (2.8ppm
of rms noise) is achieved for conversion rates up to
25kHz. The dynamic range of the converter is further
increased by providing a low-noise Programmable
Gain Amplifier (PGA) with gain stages of 1, 2, 4, or
8 for low level input signals.
The ADS1250 is designed for high-resolution mea-
surement applications in cardiac diagnostics, smart
transmitters, industrial process control, weigh scales,
chromatography and portable instrumentation. The
converter includes a flexible synchronous serial inter-
face and offers a three-wire control mode for low-cost
isolation.
The ADS1250 is a single-channel converter and is
offered in an SOL-16 package.
APPLICATIONS
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CARDIAC DIAGNOSTICS
DIRECT THERMOCOUPLE INTERFACE
BLOOD ANALYSIS
INFRARED PYROMETER
LIQUID/GAS CHROMATOGRAPHY
PRECISION PROCESS CONTROL
G0
G1
V
REF
CLK
+V
IN
PGA
–V
IN
–
+
4th-Order
∆Σ
Modulator
Digital
Filter
Serial
Output
SCLK
DRDY
DOUT
+V
S
AGND
Control
DSYNC
CS
+V
D
ADS1250
DGND
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©
1999 Burr-Brown Corporation
PDS-1520B
Printed in U.S.A. December, 1999
BURR-BROWN [ BURR-BROWN CORPORATION ]
