ADS1202
SBAS275B – DECEMBER 2002 – REVISED JULY 2004
Motor Control Current Shunt
1-Bit, 10MHz, 2nd-Order, Delta-Sigma Modulator
FEATURES
q
16-BIT RESOLUTION
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13-BIT LINEARITY
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RESOLUTION/SPEED TRADE-OFF:
10-Bit Effective Resolution with 20µs Signal
Delay (12-bit with 77µs)
q
±
250mV INPUT RANGE WITH SINGLE 5V SUPPLY
q
2% INTERNAL REFERENCE VOLTAGE
q
2% GAIN ERROR
q
FLEXIBLE SERIAL INTERFACE WITH FOUR
DIFFERENT MODES
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IMPLEMENTED TWINNED BINARY CODING AS
SPLIT PHASE OR MANCHESTER CODING FOR
ONE LINE INTERFACING
q
OPERATING TEMPERATURE RANGE:
–40
°
C to +85
°
C
DESCRIPTION
The ADS1202 is a precision, 80dB dynamic range, delta-
sigma (∆Σ) modulator operating from a single +5V supply.
The differential inputs are ideal for direct connections to
transducers or low-level signals. With the appropriate digital
filter and modulator rate, the device can be used to achieve
16-bit Analog-to-Digital (A/D) conversion with no missing
codes. Effective resolution of 12 bits can be maintained with
a digital filter bandwidth of 10kHz at a modulator rate of
10MHz. The ADS1202 is designed for use in medium reso-
lution measurement applications including current measure-
ments, smart transmitters, industrial process control, weigh
scales, chromatography, and portable instrumentation. It is
available in a TSSOP-8 package.
APPLICATIONS
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MOTOR CONTROL
q
CURRENT MEASUREMENT
q
INDUSTRIAL PROCESS CONTROL
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INSTRUMENTATION
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SMART TRANSMITTERS
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PORTABLE INSTRUMENTS
q
WEIGHT SCALES
q
PRESSURE TRANSDUCERS
V
DD
GND
Buffer
Reference
Voltage
2.5V
RC Oscillator
20MHz
Interface
Circuit
M0
M1
V
IN+
V
IN–
2nd-Order
∆∑
Modulator
MDAT
MCLK
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.
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 © 2002-2004, Texas Instruments Incorporated
www.ti.com
TI [ TEXAS INSTRUMENTS ]
