Datasheet

16
LT1677
1677fa
Microvolt Comparator with Hysteresis
–
+
LT1677
3
7
1677 TA03
4
6
1
2
3V
OUTPUT
POSITIVE FEEDBACK TO ONE OF THE NULLING TERMINALS
CREATES APPROXIMATELY 5µV OF HYSTERESIS. OUTPUT
CAN SINK 16mA
INPUT OFFSET VOLTAGE IS TYPICALLY CHANGED LESS THAN
5µV DUE TO THE FEEDBACK
INPUT
10M
5%
15k
1%
15k
1%
–
+
LT1677
3V
R*
V
OUT
FOR TEMP
COMPENSATION
OF GAIN
R*
R6
22.1Ω
1677 TA06
R4
5.49k
R3
5.49k
R5
698Ω
R7
22.1Ω
R2
5Ω
R2
5Ω
*OMEGA SG-3/350LY11
350Ω, 1%
ALL OTHER RESISTORS 1%
TRIM R11 FOR BRIDGE BALANCE
A
V
= ≅ 1000
2 • R* + R6
R6
()
R4
R2 + (R*/2)
()
3V
R*
R8
7.5Ω
R9
3.4Ω
R11
1k
R*
R*
R*
R10
232Ω
3V Strain Gauge Amplifier
TYPICAL APPLICATIO S
U
–
+
LT1677
2
7
3V < V
S
< 36V
ZETEX
BC856B
V
OUT
1677 TA07
4
6
3
R
IN
1k
SOURCE
R
LINE
0.1Ω
R
OUT
20k
LOAD
V
OUT
I
LOAD
= R
LINE
= 2V/AMP
R
OUT
R
IN
Precision High Side Current Sense
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