Datasheet

SBAS312B − JANUARY 2005 − REVISED AUGUST 200
7
   
 

FEATURES
D 16-Bit Resolution
D 14-Bit Linearity
D ±2.5V Input Range at 2.5V
D Internal Reference Voltage: 2%
D Gain Error: 0.5%
D Two Independent Delta-Sigma Modulators
D Two Input Reference Buffers
D On-Chip 20MHz Oscillator
D Selectable Internal or External Clock
D Operating Temperature Range:
−40°C to +85°C
D QFN-24 (4x4) Package
APPLICATIONS
D Motor Control
D Current Measurement
D Industrial Process Control
D Instrumentation
D 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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