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參數(shù)資料
| 型號(hào)： | LOG104AIDRE4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬運(yùn)算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, 0.01 MHz BAND WIDTH, PDSO8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 244K |
| 代理商： | LOG104AIDRE4 |
www.ti.com
LOG104
10
SBOS243C
(8)
(9)
(10)
(11)
(12)
(13)
INDIVIDUAL ERROR COMPONENTS
The ideal transfer function with current input is:
VV
I
OUT =
(
)
05
1
2
.log
The actual transfer function with the major components of
error is:
VV
K
II
Nm
V
OUT
B
OS O
=
(
) ±
(
)
±±
05
1
11
22
.
log
–
The individual component of error is:
K = gain accuracy (0.15%, typ), as specified in
specification table.
IB1 = bias current of A1 (5pA, typ)
IB2 = bias current of A2 (5pA, typ)
N = log conformity error (0.01%, 0.06%, typ)
0.01% for n = 5, 0.06% for n = 7.5
VOSO = output offset voltage (3mV, typ)
m = number of decades over which N is specified:
Example: what is the error when
I1 = 1A and I2 = 100nA
VmV
OUT =±
(
)
±
( )(
) ±
0 5
0 0015
10
5 10
10
5 10
2 0 0001 5
3 0
612
712
.
log
..
= 0.5055V
Since the ideal output is 0.5V, the error as a percent of
reading is
%
.
%. %
error
=
0 5055
05
100
1 1
For the case of voltage inputs, the actual transfer function is
VV
K
V
R
I
E
R
V
R
I
E
R
Nm
V
OUT
B
OS
B
OS
OSO
=
(
) ±
(
)
±
±±
05
1
2
.log
–
Where
E
R
and
E
R
OS
1
2
are considered to be zero for large
values of resistance from external input current sources.
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