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LOG102 数据表(PDF) 4 Page - Texas Instruments

部件名 LOG102
功能描述  LOGARITHMIC AND LOG RATIO AMPLIFIER
PDF  13 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LOG102 数据表(HTML) 4 Page - Texas Instruments

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LOG102
4
SBOS211A
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = ±5V, RL = 10kΩ, unless otherwise noted.
0
ONE CYCLE OF NORMALIZED TRANSFER FUNCTION
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
26
110
3
Current Ratio,
I
1
I
2
48
3dB FREQUENCY RESPONSE
I
2
0.1
1nA
1M
100k
10k
1k
100
10
1
10nA
100nA
1
µA10µA
100
µA
1mA
100
µA
100
µA
1mA
I
1 = 1mA
1
µA
1mA
to 10
µA
100nA
10nA
I
1 = 1nA
10nA
10nA
1
µA
10
µA
100
µA
C C
=
1µ
F
C C
= 1000pF
10µ
A to
1µ
A
C C
= 10pF
I
1 = 1nA
1nA
100
µA
NORMALIZED TRANSFER FUNCTION
0.001
3
2
1
0
–1
–2
–3
0.01
1
100
Current Ratio,
0.1
10
1000
I
1
I
2
I
1
I
2
V
OUT = 1V • Log
TOTAL ERROR vs INPUT CURRENT
1nA
60
50
40
30
20
10
0
100nA
10nA
70
°C
0
°C
25
°C
10
µA
100
µA
Input Current
(I
1 or I2)
1
µA
1mA
MINIMUM VALUE OF COMPENSATION CAPACITOR
1nA
10000
1000
100
10
1
100nA
10nA
10
µA
1mA
I
2
1
µA
100
µA
10mA
Select C
C for I1 min
and I
2 max
I
1 = 1nA
Values below 2pF
may be ignored.
I
1 = 1mA
I
1 = 100µA
I
1 = 10nA
I
1 = 100nA
I
1 = 1µA
I
1 = 10µA
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
–0.05
–0.10
–60
–40
–20
0
20
40
60
80
GAIN ERROR vs TEMPERATURE
Temperature (
°C)



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