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參數資料
| 型號： | LOG114AIRGVTG4 |
| 元件分類： | 對數放大器 |
| 英文描述： | Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER |
| 中文描述： | 單電源，高速，精密對數放大器 |
| 文件頁數： | 1/30頁 |
| 文件大?。?/td> | 616K |
| 代理商： | LOG114AIRGVTG4 |
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FEATURES
ADVANTAGES:
Tiny for High Density Systems
Precision on One Supply
Fast Over Eight Decades
Fully-Tested Function
TWO SCALING AMPLIFIERS
WIDE INPUT DYNAMIC RANGE:
Eight Decades, 100pA to 10mA
2.5V REFERENCE
STABLE OVER TEMPERATURE
LOW QUIESCENT CURRENT: 10mA
DUAL OR SINGLE SUPPLY: 5V, +5V
PACKAGE: Small QFN-16 (4mm x 4mm)
SPECIFIED TEMPERATURE RANGE:
5
°
C to +75
°
C
APPLICATIONS
ONET ERBIUM-DOPED FIBER OPTIC
AMPLIFIER (EDFA)
LASER OPTICAL DENSITY MEASUREMENT
PHOTODIODE SIGNAL COMPRESSION AMP
LOG, LOG-RATIO FUNCTION
ANALOG SIGNAL COMPRESSION IN FRONT
OF ANALOG-TO-DIGITAL (ADC) CONVERTER
ABSORBANCE MEASUREMENT
DESCRIPTION
The LOG114 is specifically designed for measuring
low-level and wide dynamic range currents in
communications, lasers, medical, and industrial
systems. The device computes the logarithm or log-ratio
of an input current or voltage relative to a reference
current
or
voltage
(logarithmic
amplifier).
High precision is ensured over a wide dynamic range of
input signals on either bipolar (
±
5V) or single (+5V)
supply. Special temperature drift compensation circuitry
is included on-chip. In log-ratio applications, the signal
current may be from a high impedance source such as
a photodiode or resistor in series with a low impedance
voltage source. The reference current is provided by a
resistor in series with a precision internal voltage
reference, photo diode, or active current source.
The output signal at V
LOGOUT
has a scale factor of 0.375V
out per decade of input current, which limits the output
so that it fits within a 5V or 10V range. The output can be
scaled and offset with one of the available additional
amplifiers, so it matches a wide variety of ADC input
ranges. Stable dc performance allows accurate
measurement of low-level signals over a wide
temperature range. The LOG114 is specified over a
5
°
C to +75
°
C temperature range and can operate from
40
°
C to +85
°
C.
transimpedance
All trademarks are the property of their respective owners.
LOG114
SBOS301A MAY 2004 REVISED MARCH 2007
Single-Supply, High-Speed, Precision
LOGARITHMIC AMPLIFIER
www.ti.com
Copyright
20042007, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
!
!
Q
1
200
R
1
(1)
1250
R
2
R
5
R
6
200
R
3
(1)
R
REF
1250
R
4
V
O4
(3)
IN
4
+IN
4
V
LOGOUT
+IN
5
IN
5
V
O5
V
CMIN
I
1
4
1
8
6
7
I
1
and I
are current inputs
from a photodiode
or other current source
11
10
14
5
3
15
13
12
16
V
REF
2.5V
V
Com
V
REFGND
Q
2
A
3
(4)
A
1
A
2
A
4
LOG114
A
5
I
REF
I
2
V+
REF
NOTES: (1) Thermally dependent R
1
and R
3
provide temperature compensation.
(2) V
LOGOUT
= 0.375
×
log(I
1
/I
2
).
(3) V
= 0.375
×
K
×
log(I
1
/I
2
)
K = 1 + R
/R
.
(4) Differential Amplifier (A
3
) Gain = 6.25
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LOG114EVM | 功能描述:放大器 IC 開發工具 LOG114 Eval Mod RoHS:否 制造商:International Rectifier 產品: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工藝設計制造的可內燒的學習碼編碼IC. |
| LOG2112 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOGARITHMIC AND LOG RATIO AMPLIFIERS |
| LOG2112AIDW | 功能描述:對數放大器 Precision Log & Log Ratio Amp RoHS:否 制造商:Texas Instruments 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| LOG2112AIDWE4 | 功能描述:對數放大器 Precision Log & Log Ratio Amp RoHS:否 制造商:Texas Instruments 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
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