參數(shù)資料
型號(hào)： LOG112AIDRE4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 模擬運(yùn)算功能
英文描述： LOG OR ANTILOG AMPLIFIER, 1.4 MHz BAND WIDTH, PDSO14
封裝： GREEN, PLASTIC, MS-012AB, SOIC-14
文件頁(yè)數(shù)： 2/20頁(yè)
文件大?。?/td> 621K
代理商： LOG112AIDRE4
LOG112, 2112
10
SBOS246D
www.ti.com
FIGURE 11. Single +5V Power-Supply Operation.
14
1
5
10
6
9
1
2
35
4
–5V
1
F
LOG112
1
F
I
1
I
2
V
LOGOUT
C
1
F
TPS(1)
Single Supply +5V
NOTE: (1) TPS60402DBV
negative charge pump.
FIGURE 10. Absorbance Measurement.
I
2
I
1
14
1
9
10
5
V
LOGOUT
6
V+
V–
C
LOG112
D
2
D
1
Sample
λ
1
λ
1
λ
1
Light
Source
DATA COMPRESSION
In many applications, the compressive effects of the logarith-
mic transfer function are useful. For example, a LOG112
preceding a 12-bit A/D converter can produce the dynamic
range equivalent to a 20-bit converter.
OPERATION ON SINGLE SUPPLY
Many applications do not have the dual supplies required to
operate the LOG112 and LOG2112. Figure 11 shows the
LOG112 and LOG2112 configured for operation with a single
+5V supply.
MEASURING AVALANCHE PHOTODIODE CURRENT
The wide dynamic range of the LOG112 and LOG2112 is
useful for measuring avalanche photodiode current (APD), as
shown in Figure 12.
FIGURE 12. High-Side Shunt for APD Measures 3 Decades of APD Current.
A
1
–5V
SO-14
911
13
LOG112
Q
1
2
Q
2
I
OUT
I
OUT = 0.1 ISHUNT
10
3
4
10k
Receiver
Irx = 1
A to 1mA
I-to-V
Converter
APD
10Gbits/sec
16.7k
C
A
2
A
3
V
03 = 2.5V to 0V
I
SHUNT
500
5k
5k
+15V to +60V
+5V
INA168
SOT23-5
+5V
1
14
8
6
5
7
100
A
25k
V
REF
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