SBAS312A − JANUARY 2005 − REVISED APRIL 2005
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FEATURES
C0068 16-Bit Resolution
C0068 14-Bit Linearity
C0068 ±2.5V Input Range at 2.5V
C0068 Internal Reference Voltage: 2%
C0068 Gain Error: 0.5%
C0068 Two Independent Delta-Sigma Modulators
C0068 Two Input Reference Buffers
C0068 On-Chip 20MHz Oscillator
C0068 Selectable Internal or External Clock
C0068 Operating Temperature Range:
−40°C to +85°C
C0068 QFN-24 (4x4) Package
APPLICATIONS
C0068 Motor Control
C0068 Current Measurement
C0068 Industrial Process Control
C0068 Instrumentation
C0068 Resolver
DESCRIPTION
The ADS1205 is a two-channel, high-performance,
delta-sigma (∆Σ) modulator with more than 98dB dynamic
range, operating from a single +5V supply. The differential
inputs are ideal for direct connection to transducers in an
industrial environment. 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 14 bits can be obtained with
a digital filter bandwidth of 40kHz at a modulator rate of
10MHz. The ADS1205 is designed for use in
high-resolution measurement applications including
current measurements, smart transmitters, industrial
process control, and resolvers. It is available in a QFN-24
(4x4) package.
2nd−Order
∆Σ Modulator
CH A+
AV
DD
CH A−
Output
Interface
Circuit
RC
Oscillator
20MHz
Out EN
Clock
Select
Divider
REFIN A
Reference
Voltage
2.5V
REFOUT
OUT A
OUT B
CLKIN
AGND BGND
BV
DD
CLKOUT
CLKSEL
2nd−Order
∆Σ Modulator
CH B+
CH B−
REFIN B
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Copyright  2005, 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.
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