參數(shù)資料
型號(hào)： LOG114AIRGVRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 模擬運(yùn)算功能
英文描述： LOG OR ANTILOG AMPLIFIER, PQCC16
封裝： 4 X 4 MM, GREEN, PLASTIC, QFN-16
文件頁數(shù)： 7/29頁
文件大?。?/td> 637K
代理商： LOG114AIRGVRG4
LOG114
SBOS301A MAY 2004 REVISED MARCH 2007
www.ti.com
15
A4
OPA335
Internal A4 Output Amplifier
External Output Amplifier
+5V
R
5
100k
V
REF
+2.5V
V
LOGOUT
V
LOGOUT
VO4 = 2/3 (VLOGOUT) + 3.16
I2
100pA
10mA
VOUT = 2.5/3 (VLOGOUT)+ 3.3
a) A4 amplifier used to scale and offset VLOGOUT for 0.5V to 2.5V output.
b) OPA335 amplifier used to scale and offset VLOGOUT for 0V to 2.5V output.
NOTE: (1) See OPA335 data sheet for use of R
P connected to 5V to achieve 0V output.
R
6
66.5k
R7
100k
R8
316k
R
5
100k
V
REF
+2.5V
R
6
82.5k
RP(1)
5V
R7
100k
R8
267k
V
O4
0.5V
2.5V
I2
100pA
10mA
V
OUT
0.5V
2.5V
Figure 4. Operational Amplifier Configuration for Scaling and Offsetting the Output Going to ADC Stage.
ADVANTAGES OF DUALSUPPLY OPERATION
The LOG114 performs very well on a single +5V supply
by level-shifting pin 7 (Com) to half-supply and raising
the common-mode voltage (pin 5, VCM IN) of the input
amplifiers. This levelshift places the input amplifiers in
the linear operating range. However, there are also
some advantages to operating the LOG114 on dual
±5V
supplies. These advantages include:
1) eliminating the need for the +4.096V precision
reference;
2) eliminating a small additional source of error arising
from the noise and temperature drift of the levelshifting
voltage; and
3) allowing increased magnitude of a reverse bias
voltage on the photodiode.
COM (PIN 7) VOLTAGE RANGE
The voltage on the Com pin is used to bias the differen-
tial amplifier, A3, within its linear range. This voltage can
provide an asymmetrical offset of the VLOGOUT voltage.
VCM IN (Pin 5)
The VCMIN pin is used to bias the A1 and A2 amplifier into
its common-mode input voltage range, (V) + 1.5V to
(V+) 1.5V.
INPUT CURRENT RANGE
To maintain specified accuracy, the input current range
of the LOG114 should be limited from 100pA to 3.5mA.
Input currents outside of this range may compromise
the LOG114 performance. Input currents larger than
3.5mA result in increased nonlinearity. An absolute
maximum input current rating of 10mA is included to
prevent excessive power dissipation that may damage
the input transistor.
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