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MAX9920ASA/V+ Datasheet(PDF) 15 Page - Analog Devices

Part # MAX9920ASA/V+
Description  -20V to 75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers
PDF  19 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

MAX9920ASA/V+ Datasheet(HTML) 15 Page - Analog Devices

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Uni-/Bidirectional Operation
The MAX9918/MAX9919/MAX9920 support both unidi-
rectional and bidirectional operation. The devices operate
in unidirectional mode with VREFIN = VGND. The output
is then referenced to ground and the output voltage VOUT
is proportional to the positive voltage drop (VSENSE) from
RS+ to RS- (Figure 1).
The MAX9918/MAX9919 operate in bidirectional mode
by application of a low-source impedance reference volt-
age in the 0V to VCC - 1.9V range, (typically VCC/2), to
REFIN. For the MAX9920, the reference voltage range
is 0V to VCC - 2.4V (typically VCC/2). The output volt-
age VOUT relative to VREFIN is then proportional to the
±VSENSE voltage drop from RS+ to RS- (Figure 2).
Figure 1. Unidirectional Operation
Figure 2. Bidirectional Operation
IDISCHARGE
RSENSE
LOAD
TO ADC
VCC
GND
RS+
RS-
REFIN
OUT
40mV
10mV
30mV
20mV
0
DISCHARGE
CURRENT
0.9V
3.6V
2.7V
G = 90V/V
5V
1.8V
SHDN
VSENSE
VOUT
MAX9919N
IDISCHARGE
RSENSE
ICHARGE
LOAD
TO ADC
2.5V
VCC
GND
RS+
RS-
REFIN
OUT
-20mV
10mV
20mV
0
DISCHARGE
CURRENT
CHARGE
CURRENT
-1.8V
1.8V
0.9V
G = 90V/V
VSENSE
5V
-0.9V
-10mV
SHDN
VOUT - VREFIN
MAX9919N
www.maximintegrated.com
Maxim Integrated │ 15
MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers



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