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LOG114 Datasheet(PDF) 24 Page - Texas Instruments

Part # LOG114
Description  LOG114 Single-Supply, High-Speed, Precision Logarithmic Amplifier
PDF  43 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LOG114 Datasheet(HTML) 24 Page - Texas Instruments

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7.2.5 Data Compression
In many applications, the compressive effects of the logarithmic transfer function are useful. For example, a
LOG114 preceding a 12-bit ADC can produce the dynamic range equivalent to a 20-bit converter (like the
ADS7818 or ADS7834).
7.2.6 3.3V Operation
For systems with only a 3.3V power supply, the TPS60241 zero-ripple switched cap buck-boost 2.7V to 5.5V
input to 5V output converter may be used to generate a 5V supply for the LOG114 (see Figure 7-12).
LOG114
TPS60241
V
IN
C
1+
C
1-
GND
V
OUT
C
2+
C
2-
EN
1 μF
1 μF
1 μF
I
1
I
2
1 μF
3.3V
V+
V–
V
LOGOUT
5V
Figure 7-12. Creating a 5V Supply from a 3.3V Supply
Likewise, the TPS6040 negative charge pump may be connected to the 5V output of the TPS60241 to generate
a −5V supply to create a ±5V supply for the LOG114 (see Figure 7-13).
1 μF
LOG114
TPS60241
TPS60400
C
FLY-
C
FLY+
IN
OUT
GND
1 μF
1 μF
-5V
V
IN
C
1+
C
1-
GND
V
OUT
C
2+
C
2-
EN
1 μF
1 μF
1 μF
1 μF
I
1
I
2
1 μF
3.3V
V+
5V
V–
-5V
V
LOGOUT
Figure 7-13. Creating a ±5V Supply from a 3.3V Supply
7.2.7 Erbium-Doped Fiber Optic Amplifier (EDFA)
The LOG114 was designed for optical networking systems. Figure 7-14 shows a block diagram of the LOG114 in
a typical EDFA application. This application uses two log amps to measure the optical input and output power of
the amplifier. A difference amplifier subtracts the log output signals of both log amps and applies an error voltage
to the proportional-integral-derivative (PID) controller. The controller output adjusts a voltage-controlled current
source (VCCS), which then drives the power op amp and pump laser. The desired optical gain is achieved when
the error voltage at the PID is zero.
LOG114
SBOS301B – MAY 2004 – REVISED MARCH 2025
www.ti.com
24
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Copyright © 2025 Texas Instruments Incorporated
Product Folder Links: LOG114



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