Datasheet

LTC2414/LTC2418
40
241418fa
350Ω
BRIDGE
0.1µF
1µF
15V15V
–15V
38
14
7
4
13
12
11
10V 5V
15V
U1
LTC1043
6
2
7
4
7
4
–
+
REF
+
REF
–
CH0
CH1
GND
V
CC
11
12
21
22
15
2410 F52
9
5V
LTC2414/
LTC2418
47µF 0.1µF
10V
+
17
5
15
6
18
3
2
U2
LTC1043
1µF
FILM
8
14
7
4
13
12
11
*
*
*
5V
U2
LTC1043
17
–10V
–10V
LT1236-5
1k
33Ω
Q1
2N3904
0.1µF
15V
–15V
–15V
3
6
2
–
+
1k
33Ω
–10V
10V
Q2
2N3906
*FLYING CAPACITORS ARE
1µF FILM (MKP OR EQUIVALENT)
SEE LTC1043 DATA SHEET FOR
DETAILS ON UNUSED HALF OF U1
LTC1150
LTC1150
20Ω
200Ω
20Ω
200Ω
0.1µF
10µF
+
Figure 46. LTC1043 Provides Precise 4X Reference for Excitation Voltages
APPLICATIO S I FOR ATIO
WUUU
The error associated with the 10V excitation would be
–80ppm. Hence, overall reference error could be as high
as 130ppm, the average of the two.
Figure 47 shows a similar scheme to provide excitation
using resistor arrays to produce precise gain. The circuit
is configured to provide 10V and –5V excitation to the
bridge, producing a common mode voltage at the input to
the LTC2414/LTC2418 of 2.5V, maximizing the AC input
range for applications where induced 60Hz could reach
amplitudes up to 2V
RMS
.