LTC1051/LTC1053
TYPICAL APPLICATIO S
Dual Instrumentation Amplifier
+
LTC1043
7
8
1µF
11
5V
0.0022µF
Q1
Q1
22pF
0.1µF
3k
0.1%
2
7
8
1/2
LTC1051
4
0.1µF
–5V
2.5M
0.1%
2.5V
5V
Six Decade Log Amplifier
INPUT 1
V
IN
–
1/2
LTC1051
1
2M
1N4148
1nA < I
IN
<1mA
3
+
V
OUT
= LOG V
IN
–2V
1k
0.1%
Q1: TEL LAB TYPE Q81
ADJUST 2M POR. FOR NONLINEARITIES
Linearized Platinum Signal Conditioner
250k*
5V
3
10k*
5V
1
274k*
50k
ZERO
ADJUST
8.25k*
2.4k
LT1009
2.5V
(LINEARITY CORRECTION LOOP)
+
–
8
2
1/2
LTC1051
4
0.1µF
2k
7
8
5
11
1µF
12
1µF
887Ω
13
1/2 LTC1043
14
I
K
R
P
100Ω
AT 0°C
0.01µF
RP = ROSEMOUNT 118MFRTD
*1% FILM RESISTOR
TRIM SEQUENCE:
SET SENSOR TO 0°C VALUE. ADJUST ZERO FOR 0V OUT
SET SENSOR TO 100°C VALUE. ADJUST GAIN FOR 1.000V OUT
SET SENSOR TO 400°C VALUE. ADJUST LINEARITY FOR 4.000V OUT
REPEAT AS REQUIRED. FOR MORE INFORMATION REFER TO AN3
+
10k
0.1%
15.8k
0.1%
–
U
5V
3
+
–
8
1
V
OUT1
2
1µF
1/2
LTC1051
12
100k
6
–
+
1k
13
14
0.22µF
GAIN = 101V/DIV
5
1µF
2
6
1µF
3
100k
5
LT1009
6
5
+
1/2
LTC1051
7
V
OUT2
–
4
INPUT 2
1051/53 AC05
–
1k
18
16
17
15
4
5V
0.0047µF
0.22µF
CMRR >100dB
V
OS
≅
3µV
INPUT REFERRED NOISE
≅
2µV
P-P
1051/53 AC06
4
6
5
1µF
6
1µF
3
8.06k*
15
1/2 LTC1043
16
17
18
1k
+
1/2
LTC1051
0V TO 4V =
0°C TO 400°C
±0.05°C
7
2
–
1k
GAIN
ADJUST
5k
1051/53 AC07
10513fa
13
LINER [ LINEAR TECHNOLOGY ]
