LT1057_15 Datasheet, PDF (13/16 Pages) Linear Technology – Dual and Quad, JFET Input Precision High Speed Op Amps

LT1057/LT1058
TYPICAL APPLICATIONS
Instrumentation Amplifier with Shield Driver
3₊
1/4
1
1k
10k
2
LT1058
–
R_F
9.1k
GUARD
INPUT
GUARD
R_G
1k
10
8
1/4
LT1058
9
R_G
1k
15V
5₊
4
1/4
7
LT1058
6_–
11
–15V
OUTPUT
13 _–
R_F
9.1k
1/4
14
12
LT1058
+
1k
GAIN = 10(1+R_F/R_G) ≈ 100
10k
I_B = 5pA
R_IN = 10¹²â„¦
BW = 350kHz
10578 TA09
100dB Range Logarithmic Photodiode Amplifier
I_P
LT1021-10V
15V
IN
OUT
6 Q4 4
5
500pF
–
1/2
LT1057
+
10k*
10k*
2k
10
2k ¹¹ Q5
12
0.033µF
–
LM301A
+
1M
1M
FULL-SCALE
750k* ^TRIM
50k*
0.01µF
–
1/2
LT1057
+
1
3k
2
3
Q2
50k
DARK
TRIM
E_OUT
15
14 _Q1
13
= HP-5082-4204 PIN PHOTODIODE.
Q1–Q5 = CA3096.
CONNECT SUBSTRATE OF CA3096
ARRAY TO Q4’s EMITTER.
*1% RESISTOR
100dB RANGE LOGARITHMIC PHOTODIODE AMPLIFIER
33Ω
7
8
Q3
9
15V
LIGHT (900µM)
1MW
100µW
10µW
1µW
100nW
10nW
RESPONSE DATA
DIODE CURRENT
350µA
35µA
3.5µA
350nA
35nA
3.5nA
CIRCUIT OUTPUT
10.0V
7.85V
5.70V
3.55V
1.40V
–0.75V
10578 TA10
10578fd
13