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LOG104 Scheda tecnica(PDF) 4 Page - Texas Instruments

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Il numero della parte LOG104
Spiegazioni elettronici  LOGARITHMIC AND LOG RATIO AMPLIFIER
PDF  13 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

LOG104 Scheda tecnica(HTML) 4 Page - Texas Instruments

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LOG104
4
SBOS243B
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = ±5V, RL = 10kΩ, unless otherwise noted.
ONE CYCLE OF NORMALIZED TRANSFER FUNCTION
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
26
110
3
Current Ratio, I
1/I2
48
2.0
1.5
1.0
0.5
0.0
–0.5
–1.0
–1.5
–2.0
NORMALIZED TRANSFER FUNCTION
0.0001 0.001
0.01
0.1
1
10
100
1k
10k
Current Ratio, I
1/I2
V
OUT = 0.5V LOG (I1/I2)
3dB FREQUENCY RESPONSE
0.1
1M
100k
10k
1k
100
10
1
100
µA
100
µA
1mA
I
1 = 1mA
1
µA
1mA
to 10
µA
100nA
10nA
I
1 = 1nA
10nA
C C
= 1000pF
C C
= 1
µF
10µ
A to
1µ
A
C C
= 10pF
1nA
100
µA
100pA
1nA
10nA
100nA
1
µA10µA 100µA1mA
I
2
1
µA
10
µA
100
µA
I
1 = 1nA
10nA
120
100
80
60
40
20
0
100pA 1nA
10nA 100nA
1
µA10µA 100µA 1mA 10mA
TOTAL ERROR vs INPUT CURRENT
Input Current (I
1 or I2)
+75
°C
+25
°C –5°C
5.8
4.8
3.8
2.8
1.8
0.8
–0.2
100pA 1nA
10nA 100nA 1
µA10µA 100µA 1mA 10mA
GAIN ERROR (I
2 = 1µA)
Input Current (I
1 or I2)
–5
°C to –40°C
+85
°C
+75
°C
+25
°C
MINIMUM VALUE OF COMPENSATION CAPACITOR
100M
10M
1M
100k
10k
1k
100
10
1
100pA
1nA
10nA 100nA
1
µA10µA 100µA 1mA 10mA
I
2
I
1 = 100pA
I
1 = 1nA
I
1 = 10nA
I
1 = 100nA
1
µA
I
1 = 10µA
100
µA
1mA
Select C
C for I1 min.
and I
2 max. Values
below 2pF may be ignored.



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