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LT1787/LT1787HV
1787fc
Precision, High Side
Current Sense Amplifiers
Input Offset Voltage: 75
µ
V (Max)
60V Supply Operation (LT1787HV)
12-Bit Dynamic Range
Operating Current: 60µA
User-Selectable External Sense Resistor
Bidirectional High Side Current Sensing
Unidirectional or Bidirectional Output
Input Noise Filtering
–40°C to 125°C Operating Temperature Range
Available in 8-Lead SO and MSOP Packages
The LT
®
1787 is a complete micropower precision high
side current sense amplifier. The LT1787 monitors bidi-
rectional currents via the voltage across an external sense
resistor. A current or voltage output indicates the direction
and magnitude of the sense current. The LT1787 delivers
greater than a 12-bit dynamic range with ultralow 40µV
input offset voltage compared to a typical 250mV full-
scale input voltage. A fixed gain of 8 is set by onboard
precision resistors. Input signal filtering is easily imple-
mented with a capacitor between the FIL
and FIL
+
pins.
The LT1787HV operates from 2.5V to 60V total supply
voltage and the LT1787 operates from 2.5V to 36V total
supply voltage. Both versions have a PSRR in excess of
120dB. The LT1787/LT1787HV draw only 60µA and are
available in 8-lead SO and MSOP packages.
Battery Monitoring
Power Monitoring
Portable Phones
Cellular Phones
Portable Test/Measurement Systems
Battery-Operated Systems
Input Offset Voltage vs Supply Voltage
12-Bit Dynamic Resolution Unidirectional Output into LTC
®
1286 ADC
TOTAL SUPPLY VOLTAGE (V)
0
INPUT OFFSET VOLTAGE (µV)
10
20
30 40
1787 TA01b
50
50
40
30
20
10
0
–10
–20
–30
–40
–50
60
18
27
36
45
LT1787HV
R
SENSE
0.0016
1787 TA01
C1
1µF
5V
FIL
+
FIL
R1
15k
C2
0.1µF
V
OUT
= V
BIAS
+ (8 • I
LOAD
• R
SENSE
)
I = 100A
2.5V TO 60V
TO
LOAD
LT1634-1.25
TO µP
V
REF
V
CC
GND
LTC1286
CS
CLK
D
OUT
+IN
–IN
V
BIAS
V
OUT
R
OUT
20k
V
S
V
S
+
DNC
V
EE
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.

LT1787HVIMS8#TR 数据手册

Linear Technology(凌力尔特)
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