- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44716 > LOG114AIRGVRG4 (TEXAS INSTRUMENTS INC) LOG OR ANTILOG AMPLIFIER, PQCC16 PDF資料下載
參數(shù)資料
| 型號： | LOG114AIRGVRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬運算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, PQCC16 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, QFN-16 |
| 文件頁數(shù)： | 3/29頁 |
| 文件大?。?/td> | 637K |
| 代理商： | LOG114AIRGVRG4 |
第1頁第2頁當(dāng)前第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁
LOG114
SBOS301A MAY 2004 REVISED MARCH 2007
www.ti.com
11
APPLICATIONS INFORMATION
OVERVIEW
The LOG114 is a precision logarithmic amplifier that is
capable of measuring currents over a dynamic range of
eight decades. It computes the logarithm, or log ratio,
of an input current relative to a reference current ac-
cording to equation (1).
V
LOGOUT + 0.375
log
10
I
1
I
2
The output at VLOGOUT can be digitized directly, or scaled
for an ADC input using an uncommitted or external op
amp.
An offsetting voltage (VCom) can be connected to the
Com pin to raise the voltage at VLOGOUT. When an
offsetting voltage is used, the transfer function
becomes:
V
LOGOUT + 0.375
log
10
I
1
I
2
) V
Com
Either I1 or I2 can be held constant to serve as the refer-
ence current, with the other input being used for the in-
put signal. The value of the reference current is selected
such that the output at VLOGOUT (pin 9) is zero when the
reference current and input current are equal. An on-
chip 2.5V reference is provided for use in generating the
reference current.
Two additional amplifiers, A4 and A5, are included in the
LOG114 for use in scaling, offsetting, filtering, threshold
detection, or other functions.
BASIC CONNECTIONS
Figure 1 and Figure 2 show the LOG114 in typical dual
and single-supply configurations, respectively. To re-
duce the influence of lead inductance of power-supply
lines, it is recommended that each supply be bypassed
with a 10
F tantalum capacitor in parallel with a 1000pF
ceramic capacitor as shown in Figure 1 and Figure 2.
Connecting these capacitors as close to the LOG114
V+ supply pin to ground as possible improves supply
related noise rejection.
Q1
R1
R2
R5
100k
R6
66.5k
R7
100k
R
8
56.2k
R3
R
REF
2.5M
R4
V
O4
(2)
IN4
+IN4
V
LOGOUT
(1)
+IN5
IN
5
VO5
V
CM IN
I
1
4
11
10
9
14
5
3
15
13
12
16 VREF
2.5V
REF
V
Com
VREF GND
Q2
A3
A
1
A
2
A
4
A5
I
REF
1
F
Input Signal
100pA to 10mA
I2
V+
1
86
7
+5V
++
5V
1000pF
10
F10F
LOG114
NOTE: (1) V
LOGOUT = 0.375 × log(I1/I2)
(2) VO4 = 0.249 × log(I1/I2)+ 1.5V
Figure 1. Dual Supply Configuration Example for Best Accuracy Over Eight Decades.
(1)
(2)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LOG114AIRGVT | LOG OR ANTILOG AMPLIFIER, PQCC16 |
| LOG2112AIDWE4 | LOG OR ANTILOG AMPLIFIER, PDSO16 |
| LOG2112AIDW | LOG OR ANTILOG AMPLIFIER, 1.4 MHz BAND WIDTH, PDSO16 |
| LOG2112AIDWRE4 | LOG OR ANTILOG AMPLIFIER, PDSO16 |
| LOG112AIDE4 | LOG OR ANTILOG AMPLIFIER, PDSO14 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LOG114AIRGVTG4 | 功能描述:對數(shù)放大器 Prec High-Speed Logarithmic Amp 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 |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。