參數(shù)資料
型號(hào)： LOG101AID
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： PLASTIC, SOIC-8
文件頁數(shù)： 2/16頁
文件大?。?/td> 468K
代理商： LOG101AID
www.ti.com
LOG101
10
SBOS242B
(10)
FIGURE 14. High Side Shunt for Avalanche Photodiode (APD) Measures 3-Decades of APD Current.
A
1
–5V
SO-8
5
LOG101
Q
1
2
Q
2
I
OUT
I
OUT = 0.1 ISHUNT
6
1.2k
Receiver
Irx = 1
A to 1mA
I to V
Converter
APD
10Gbits/sec
1k
C
A
2
OPA703
V
OUT = 2.5V to 0V
I
SHUNT
100
A
500
5k
5k
+15V to +60V
+5V
25k
INA168
SOT23-5
REF3025
2.5V
+5V
1
8
4
3
The individual component of error is:
K = gain accuracy (0.15%, typ), as specified in the
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
VOSO = output offset voltage (3mV, typ)
n = number of decades over which N is specified:
Example: what is the error when
I1 = 1A and I2 = 100nA
VmV
OUT =±
(
)
±
( )(
) ±
1 0 0015
10
5 10
10
5 10
2 0 0001 5
3 0
612
712
.log
..
= 1.005055V
(11)
(12)
(13)
Since the ideal output is 1.000V, the error as a percent of
reading is
%
.
%. %
error
=
0 005055
1
100
0 5
For the case of voltage inputs, the actual transfer function is
VV
K
V
R
I
E
R
V
R
I
E
R
Nn
V
OUT
B
OS
B
OS
OSO
=
( ) ±
(
)
±
±±
11
2
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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