MAX9920 datasheet(14/17 Pages) MAXIM

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Uni-/Bidirectional Operation

The MAX9918/MAX9919/MAX9920 support both unidi-

rectional and bidirectional operation. The devices oper-

ate in unidirectional mode with VREFIN = GND. The

output is then referenced to ground and the output volt-

age 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

voltage 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 voltage

VOUT relative to VREFIN is then proportional to the

±VSENSE voltage drop from RS+ to RS- (Figure 2).

-20V to +75V Input Range, Precision

Uni-/Bidirectional, Current-Sense Amplifiers

______________________________________________________________________________________

IDISCHARGE

RSENSE

LOAD

TO ADC

VCC

GND

RS+

RS-

REFIN

OUT

30mV

10mV

20mV

DISCHARGE

CURRENT

0.9V

3.6V

2.7V

G = 90V/V

1.8V

SHDN

MAX9919N

VSENSE

VOUT

Figure 1. Unidirectional Operation

IDISCHARGE

RSENSE

ICHARGE

LOAD

TO ADC

2.5V

VCC

GND

RS+

RS-

REFIN

OUT

-20mV

10mV

20mV

DISCHARGE

CURRENT

CHARGE

CURRENT

-1.8V

1.8V

0.9V

G = 90V/V

VSENSE

-0.9V

-10mV

SHDN

VOUT - VREFIN

MAX9919N

Figure 2. Bidirectional Operation

MAX9920 Datasheet(PDF) 14 Page - Maxim Integrated Products

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