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參數(shù)資料
| 型號(hào)： | TL054Y |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| 中文描述： | 增強(qiáng)型場(chǎng)效應(yīng)低失調(diào)運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 60/65頁(yè) |
| 文件大小： | 1022K |
| 代理商： | TL054Y |
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TL05x, TL05xA, TL05xY
ENHANCED-JFET LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS178 – FEBRUARY 1997
60
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
analog thermometer
By combining a current source that does not vary over temperature with an instrumentation amplifier, a precise
analog thermometer can be built (see Figure 89). Amplifier U1A and IC1 establish a constant current through
the temperature-sensing diode D1. For this section of the circuit to operate correctly, the TL05x must use split
supplies and R3 must be a metal-film resistor with a low temperature coefficient.
The temperature-sensitive voltage from the diode is compared to a temperature-stable voltage reference set
by IC2. R4 should be adjusted to provide the correct output voltage when the diode is at a known temperature.
Although this potentiometer resistance varies with temperature, the divider ratio of the potentiometer remains
constant.
Amplifiers U1B, U2A, and U2B form the instrumentation amplifier that converts the difference between the diode
and reference voltage to a voltage proportional to the temperature. With switch S1 closed, the amplifier gain
equals 5 and the output voltage is proportional to temperature in degrees Celsius. With S1 open, the amplifier
gain is 9 and the output is proportional to temperature in degrees Fahrenheit. Every time that S1 is changed,
R4 must be recalibrated. By setting S1 correctly, the output voltage equals 10 mV per degree (C or F).
+
–
U1A
+
–
+
–
IC1
C1
150 pF
R1
100 k
R3
10 k
(see Note B)
D1
(see Note A)
+15 V
R2
100 k
IC2
R4
50 k
U1B
R6
10 k
R5
5 k
R7
5 k
S1
(see Note C)
R8
10 k
U2A
R10
10 k
R11
10 k
R9
R12
10 k
10 k
+15 V
+
–
U2B
–15 V
VO
(see Note D)
NOTES: A. Temperature-sensing diode
≈
(–2 mV/
°
C)
B. Metal-film resistor (low temperature coefficient)
C. Switch open for
°
F and closed for
°
C
D. VO
α
temperature; 10 mV/
°
C or 10 mV/
°
F
E. U1, U2 = TL05x. IC1, IC2 = LM385, LT1004, or LT1009 voltage reference
Figure 89. Analog Thermometer
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TL05X | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL05X_07 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL05X_08 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL05XA | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL-06 | 制造商:GW Instek 功能描述:SMD Type Measuring Clip for use with LCR-814 Handheld |
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