Datasheet

MAX9922/MAX9923
Ultra-Precision, High-Side
Current-Sense Amplifiers
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(V
DD
= 3.3V, V
SHDN
= V
DD
, V
RSB
= V
RS+
= V
RS-
= 12V, T
A
= +25°C, unless otherwise noted.)
Pin Description
PIN NAME FUNCTION
1 RSB Current-Sense Amplifier Input Stage Supply. Connect to either RS+ or RS-.
2 RS+ Current-Sense Amplifier Positive Input
3 RS- Current-Sense Amplifier Negative Input
4 N.C. No Connection. Not internally connected.
5 GND Ground
6 SHDN Shutdown Logic Input. Connect to GND to reduce quiescent current to 1µA. Connect to V
DD
for normal operation.
7 REF
Reference Voltage Input. Connect to an external voltage to provide a bidirectional current-sense output. Connect
to GND for unidirectional operation.
8FB
Gain-Set Feedback Input. Connect an optional noise reduction capacitor between OUT and FB.
MAX9922: Adjustable Gain. Connect a resistive-divider feedback network between OUT, FB, and REF to set the
current-sense amplifier gain. Use an external combination of R1 and R2 resistors for gain = 1 + (R2/R1).
MAX9923T/MAX9923H/MAX9923F: Fixed gain. See the Functional Diagrams.
9 OUT Voltage Output. V
OUT
is proportional to V
SENSE
.
10 V
DD
Power-Supply Voltage Input. Bypass to GND with a 0.1µF capacitor.
OVERLOAD RECOVERY
(OUTPUT LIMITING) (MAX9922, A
V
= 100)
MAX9922/23 toc21
TIME (150µs/div)
INPUT
(50mV/div)
OUTPUT
(1V/div)
0V
0V
SATURATION/OVERLOAD RECOVERY
(INPUT LIMITED) (MAX9922)
MAX9922/23 toc20
TIME (200µs/div)
INPUT
(100mV/div)
OUTPUT
(1V/div)
GAIN = 5V/V
0V
0V