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| LOG114 Datasheet, PDF (19/30 Pages) Burr-Brown (TI) – Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER | |||
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LOG114
www.ti.com
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. (Sug-
gested products: ADS7818, ADS7834).
+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 gener-
ate a +5V supply for the LOG114, as shown in
Figure 11.
Likewise, the TPS6040 negative charge pump may be
connected to the +5V output of the TPS60241 to gener-
ate a â5V supply to create a ±5V supply for the
LOG114, as Figure 12 illustrates.
SBOS301A â MAY 2004 â REVISED MARCH 2007
+3.3V
C1
1µF
I1
LOG114
I2
V+ Vâ
VLOGOUT
TPS60241
VIN VOUT +5V
C1
C1+ C2+
1µF
C1â C2â
C2
1µF
C0
1µF
GND EN
Figure 11. Creating a +5V Supply from a +3.3V Supply.
+3.3V
C1
1µF
I1
LOG114
I2
V+ Vâ
+5V â5V
VLOGOUT
CFLY
1µF
C1
1µF
TPS60241
VIN VOUT
C1+
C2+
C1â
C2â
+5V
C2
1µF
CO
1µF
GND EN
CFLYâ CFLY+
â5V
IN TPS60400 OUT
CI
GND
CO
1µF
1µF
Figure 12. Creating a ±5V Supply from a +3.3V Supply.
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