CSA221
Bidirectional, High-Voltage,
High-Precision, Current-Sense Amplifier
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1. FEATURES
• 0V to 76V input common mode
• Low 10μV (typ) input offset voltage
• Low 0.1% (max) gain error
• Low power consumption 0.3mA
• Gain options
G = 10V/V (CSA221-10)
G = 20V/V (CSA221-20)
G = 50V/V (CSA221-50)
G = 100V/V (CSA221-100)
• SOIC-8 package
• TSSOP-8 package
2. APPLICATIONS
• Base stations and communication equipment
• Power management systems
• Server backplanes
• Industrial control and automation
• Battery current sensing
3. DESCRIPTION
The CSA221 bidirectional high-side current-sense amplifier
has precision accuracy specifications of V
OS
less than 10μV
(Typ) and gain error less than 0.1% (max).
The CSA221 features an input common-mode voltage range
from 0V to 76V with 60kHz of small-signal bandwidth, which
makes it ideal for interfacing with an ADC for multichannel
multiplexed data acquisition systems.
The CSA221 operates over the –40°C to 125°C temperature
range. See Table 1 for the order information.
CSA221
V
DD
= 2.7V to 5.5V
–
+
REF1
V
CM
= 0V to 76V
System
Load
R
SENSE
RS–
RS+
ADX111
GND
VDD
VDD
REF2
OUT
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