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)： 3/13頁
文件大?。?/td> 273K
代理商： LOG104AIDR
www.ti.com
LOG104
SBOS243B
3
TOTAL ERROR
(4)(5)
Initial
I
1
or I
2
remains fixed while other varies.
Min to Max
I
1
or I
2
= 3.5mA
I
or I
= 1mA
I
1
or I
2
= 100
μ
A
I
1
or I
2
= 10
μ
A
I
or I
= 1
μ
A
I
1
or I
2
= 100nA
I
1
or I
2
= 10nA
I
or I
= 1nA
I
1
or I
2
= 350pA
I
1
or I
2
= 100pA
I
1
or I
2
= 3.5mA
I
or I
= 1mA
I
1
or I
2
= 100
μ
A
I
1
or I
2
= 10
μ
A
I
or I
= 1
μ
A
I
1
or I
2
= 100nA
I
1
or I
2
= 10nA
I
or I
= 1nA
I
1
or I
2
= 350pA
I
1
or I
2
= 100pA
I
1
or I
2
= 3.5mA
I
or I
= 1mA
I
1
or I
2
= 100
μ
A
I
1
or I
2
= 10
μ
A
I
or I
= 1
μ
A
I
1
or I
2
= 100nA
I
1
or I
2
= 10nA
I
or I
= 1nA
I
1
or I
2
= 350pA
I
1
or I
2
= 100pA
±
75
±
20
±
20
±
20
±
20
±
20
±
20
±
20
±
20
±
20
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
vs Temperature
±
1.2
±
0.4
±
0.1
±
0.05
±
0.05
±
0.09
±
0.2
±
0.3
±
0.1
±
0.3
±
3.0
±
0.1
±
0.1
±
0.1
±
0.1
±
0.1
±
0.1
±
0.25
±
0.1
±
0.1
mV/
°
C
mV/
°
C
mV/
°
C
mV/
°
C
mV/
°
C
mV/
°
C
mV/
°
C
mV/
°
C
mV/
°
C
mV/
°
C
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
vs Supply
FREQUENCY RESPONSE, CORE LOG
(6)
BW, 3dB
I
2
= 10nA
I
2
= 1
μ
A
I
2
= 10
μ
A
I
= 1mA
Step Response
Increasing
I
2
= 1
μ
A to 1mA
I
2
= 100nA to 1
μ
A
I
= 10nA to 100nA
Decreasing
I
2
= 1mA to 1
μ
A
I
2
= 1
μ
A to 100nA
I
2
= 100nA to 10nA
C
C
= 4500pF
C
C
= 150pF
C
C
= 150pF
C
C
= 50pF
0.1
38
40
45
kHz
kHz
kHz
kHz
C
C
= 150pF
C
C
= 150pF
C
C
= 150pF
11
7
110
μ
s
μ
s
μ
s
C
C
= 150pF
C
C
= 150pF
C
C
= 150pF
45
20
550
μ
s
μ
s
μ
s
POWER SUPPLY
Operating Range
Quiescent Current
V
±
4.5
±
18
±
1.5
V
I
O
= 0
±
1
mA
TEMPERATURE RANGE
Specified Range, T
MIN
to T
MAX
Operating Range
Storage Range
Thermal Resistance,
θ
JA
SO-8
–
5
–
40
–
55
75
85
125
°
C
°
C
°
C
150
°
C/W
NOTES:(1) Log Conformity Error is peak deviation from the best-fit straight line of V
OUT
versus log (I
1
/I
2
) curve expressed as a percent of peak-to-peak full-scale.
(2) May require higher supply for full dynamic range.
(3) Output core log function is trimmed to 0.5V output per decade change of input current.
(4) Worst-case Total Error for any ratio of I
1
/I
2
is the largest of the two errors, when I
1
and I
2
are considered separately.
(5) Total I
1
+ I
2
should be kept below 4.5mA on
±
5V supply.
(6) Bandwidth (3dB) and transient response are a function of both the compensation capacitor and the level of input current.
ELECTRICAL CHARACTERISTICS
(Cont.)
Boldface
limits apply over the specified temperature range,
T
A
=
–
5
°
C to +75
°
C.
At T
A
= +25
°
C, V
S
=
±
5V, R
L
= 10k
, unless otherwise noted.
LOG104AID
PARAMETER
CONDITION
MIN
TYP
MAX
UNITS
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