參數(shù)資料
型號: LOG104AIDR
廠商: Texas Instruments, Inc.
英文描述: LOGARITHMIC AND LOG RATIO AMPLIFIER
中文描述: 對數(shù)和對數(shù)比率放大器
文件頁數(shù): 4/13頁
文件大?。?/td> 273K
代理商: LOG104AIDR
www.ti.com
LOG104
SBOS243B
4
TYPICAL CHARACTERISTICS
At T
A
= +25
°
C, V
S
=
±
5V, R
L
= 10k
, unless otherwise noted.
ONE CYCLE OF NORMALIZED TRANSFER FUNCTION
N
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
2
6
1
10
3
Current Ratio,
I
1
/I
2
4
8
2.0
1.5
1.0
0.5
0.0
0.5
1.0
1.5
2.0
N
NORMALIZED TRANSFER FUNCTION
0.0001 0.001
0.01
0.1
Current Ratio, I
1
/I
2
1
10
100
1k
10k
V
OUT
= 0.5V LOG (I
1
/I
2
)
3dB FREQUENCY RESPONSE
3
0.1
1M
100k
10k
1k
100
10
1
μ
A
μ
A
100
I
1
= 1mA
1
μ
A
1mA
μ
A
100nA
10nA
I
1
= 1nA
10nA
C
C
= 1000pF
C
C
=1
μ
F
10
μ
A to 1
μ
A
C
C
=10pF
1nA
100
μ
A
100pA
1nA
10nA
100nA
1
μ
A
10
μ
A
100
μ
A
1mA
I
2
1
μ
A
10
μ
A
100
μ
A
I
1
= 1nA
10nA
120
100
80
60
40
20
0
100pA 1nA
10nA 100nA
1
μ
A
10
μ
A 100
μ
A 1mA 10mA
TOTAL ERROR vs INPUT CURRENT
Input Current (I
1
or I
2
)
T
+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
μ
A
10
μ
A 100
μ
A 1mA
10mA
GAIN ERROR (I
2
= 1
μ
A)
Input Current (I
1
or I
2
)
G
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
C
C
1nA
10nA 100nA
1
μ
A
10
μ
A 100
μ
A
1mA
10mA
I
2
I
1
= 100pA
I
1
= 1nA
I
1
= 10nA
I
1
= 100nA
1
μ
A
I
1
= 10
μ
A
100
μ
A
1mA
Select C
for I
min.
and I
max. Values
below 2pF may be ignored.
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