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LOG112 Scheda tecnica(PDF) 10 Page - Texas Instruments

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Il numero della parte LOG112
Spiegazioni elettronici  Precision LOGARITHMIC AND LOG RATIO AMPLIFIERS
PDF  20 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

LOG112 Scheda tecnica(HTML) 10 Page - Texas Instruments

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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
µF
LOG112
1
µF
I
1
I
2
V
LOGOUT
C
C
1
µF
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
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
Ω
Receiver
Irx = 1
µA to 1mA
I-to-V
Converter
APD
10Gbits/sec
16.7k
Ω
C
C
A
2
A
3
V
03 = 2.5V to 0V
I
SHUNT
500
Ω
5k
Ω
5k
Ω
+15V to +60V
+5V
INA168
SOT23-5
+5V
1
1
14
8
6
5
7
100
µA
25k
Ω
V
REF



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