®
ADS
121
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ADS
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210
ADS
121
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ADS1210
ADS1211
ADS
12
11
ADS
121
1
24-Bit ANALOG-TO-DIGITAL CONVERTER
FEATURES
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DELTA-SIGMA A/D CONVERTER
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23 BITS EFFECTIVE RESOLUTION AT 10Hz
AND 20 BITS AT 1000Hz
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DIFFERENTIAL INPUTS
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PROGRAMMABLE GAIN AMPLIFIER
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FLEXIBLE SPI COMPATIBLE SSI
INTERFACE WITH 2-WIRE MODE
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PROGRAMMABLE CUT-OFF FREQUENCY
UP TO 15.6kHz
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INTERNAL/EXTERNAL REFERENCE
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ON CHIP SELF-CALIBRATION
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ADS1211 INCLUDES 4 CHANNEL MUX
DESCRIPTION
The ADS1210 and ADS1211 are precision, wide
dynamic range, delta-sigma analog-to-digital converters
with 24-bit resolution operating from a single +5V
supply. The differential inputs are ideal for direct
connection to transducers or low level voltage sig-
nals. The delta-sigma architecture is used for wide
dynamic range and to guarantee 22 bits of no missing
code performance. An effective resolution of 23 bits
is achieved through the use of a very low-noise input
amplifier at conversion rates up to 10Hz. Effective
resolutions of 20 bits can be maintained up to a
sample rate of 1kHz through the use of the unique
Turbo modulator mode of operation. The dynamic
range of the converters is further increased by provid-
ing a low-noise programmable gain amplifier with a
gain range of 1 to 16 in binary steps.
The ADS1210 and ADS1211 are designed for high
resolution measurement applications in smart trans-
mitters, industrial process control, weigh scales, chro-
matography and portable instrumentation. Both con-
verters include a flexible synchronous serial interface
which is SPI compatible and also offers a two-wire
control mode for low cost isolation.
The ADS1210 is a single channel converter and is
offered in both 18-pin DIP and 18-lead SOIC pack-
ages. The ADS1211 includes a 4 channel input multi-
plexer and is available in 24-pin DIP, 24-lead SOIC,
and 28-lead SSOP packages.
V
BIAS
X
IN
X
OUT
APPLICATIONS
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INDUSTRIAL PROCESS CONTROL
INSTRUMENTATION
BLOOD ANALYSIS
SMART TRANSMITTERS
PORTABLE INSTRUMENTS
WEIGH SCALES
PRESSURE TRANSDUCERS
AGND AV
DD
REF
OUT
REF
IN
A
IN
1P
A
IN
1N
A
IN
2P
A
IN
2N
A
IN
3P
A
IN
3N
A
IN
4P
A
IN
4N
MUX
A
IN
P
+2.5V
Reference
+3.3V Bias
Generator
Clock Generator
DGND
DV
DD
Micro Controller
Second-Order
∆∑
Modulator
Third-Order
Digital Filter
Instruction Register
Command Register
Data Output Register
Offset Register
Full-Scale Register
SCLK
SDIO
SDOUT
PGA
A
IN
N
Modulator Control
Serial Interface
ADS1211 Only
ADS1210/11
DSYNC
CS
MODE
DRDY
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
®
©
1996 Burr-Brown Corporation
PDS-1284E
1
ADS1210, 1211
Printed in U.S.A. May, 2000
BURR-BROWN [ BURR-BROWN CORPORATION ]
