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參數(shù)資料
| 型號： | LOG114AIRGVRG4 |
| 元件分類： | 對數(shù)放大器 |
| 英文描述： | Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER |
| 中文描述： | 單電源，高速，精密對數(shù)放大器 |
| 文件頁數(shù)： | 15/30頁 |
| 文件大小： | 616K |
| 代理商： | LOG114AIRGVRG4 |
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SBOS301A MAY 2004 REVISED MARCH 2007
www.ti.com
15
A
4
OPA335
Internal A4OutputAmplifier
External OutputAmplifier
+5V
R
5
100k
V
+2.5V
V
LOGOUT
V
LOGOUT
V
O4
=
2/3(V
LOGOUT
) + 3.16
I
2
100pA
10mA
V
OUT
=
2.5/3(V
LOGOUT
) + 3.3
a)A
4
amplifier usedtoscaleandoffset V
LOGOUT
for0.5Vto2.5Voutput.
b) OPA335amplifier usedtoscale andoffset V
LOGOUT
for 0Vto2.5Voutput.
NOTE: (1) SeeOPA335datasheet for useof R
P
connectedto
5Vtoachieve0Voutput.
R
6
66.5k
R
7
100k
R
8
316k
R
5
100k
V
+2.5V
R
6
82.5k
R
P(1)
5V
R
7
100k
R
8
267k
V
O4
0.5V
2.5V
I
2
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, V
CM 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, A
3
, within its linear range. This voltage can
provide an asymmetrical offset of the V
LOGOUT
voltage.
V
CM IN
(Pin 5)
The V
CM IN
pin is used to bias the A
1
and A
2
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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| LOG114AIRGVT | 功能描述:對數(shù)放大器 Precision High-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
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| LOG114EVM | 功能描述:放大器 IC 開發(fā)工具 LOG114 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| LOG1527 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:由CMOS工藝設(shè)計(jì)制造的可內(nèi)燒的學(xué)習(xí)碼編碼IC. |
| LOG2112 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOGARITHMIC AND LOG RATIO AMPLIFIERS |
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