參數(shù)資料
型號： TL054AMJ
廠商： Texas Instruments, Inc.
英文描述： ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
中文描述： 增強(qiáng)型場效應(yīng)低失調(diào)運(yùn)算放大器
文件頁數(shù)： 59/65頁
文件大?。?/td> 1022K
代理商： TL054AMJ
TL05x, TL05xA, TL05xY
ENHANCED-JFET LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS178 – FEBRUARY 1997
59
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
high input impedance log amplifier
The low input offset voltage and high input impedance of the TL05xA creates a precision log amplifier (see
Figure 87). IC1 is a 2.5-V, low-current precision, shunt regulator. Transistors Q1 and Q2 must be a closely
matched NPN pair. For best performance over temperature, R4 should be a metal film resistor with a low
temperature coefficient.
In this circuit, U1A serves as a high-impedance unity-gain buffer. Amplifier U1B converts the input voltage to
a current through R1 and Q1. Amplifier U1C, IC1, and R4 form a 1-
μ
A temperature-stable current source that
sets the base-emitter voltage of Q2. U1D amplifies the difference between the base-emitter voltage of Q1 and
Q2 (see Figure 88). The output voltage is given by the following equation:
VO
– 1
R6
R5
kT
q
In
VI
1
R1
10
–6
where k
and T is in degrees kelvin.
1.38
10–23, q
1.602
10–19,
+
_
U1A
_
+
+
_
_
+
U1C
VI
R1
10 k
Q1
Q2
2N2484
R2
10 k
15 V
2.5 M
R4
150 pF
C1
IC1
270 k
R3
–15V
R5
10 k
R6
10 k
VO
(see equation above)
NOTE A: U1A through U1D = TL05xA. IC1 = LM385, LT1004, or LT1009 voltage reference.
Figure 87. Log Amplifier
0
1
2
3
4
5
6
A
f – Frequency – Hz
7
8
9
10
–0.4
–0.35
–0.3
–0.25
–0.2
–0.15
–0.1
áá
áá
áá
Figure 88. Output Voltage vs Input Voltage for Log Amplifier
相關(guān)PDF資料
PDF描述
TL054AMN ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
TL051AMD ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
TL052MP ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
TL052Y ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
TL054ACD ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TL054AMJB 制造商:Rochester Electronics LLC 功能描述:- Bulk
TL054AMN 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
TL054C 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS
TL054CD 功能描述:運(yùn)算放大器 - 運(yùn)放 Enhanced Prec Q RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
TL054CDBR 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad Enhanced JFET Precision RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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