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參數(shù)資料
| 型號(hào)： | op491 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Micropower Single-Supply Rail-to-Rail Input/Output Op Amps(微功耗單電源滿幅度運(yùn)算放大器) |
| 中文描述： | 微功耗單電源軌到軌輸入/輸出運(yùn)算放大器（微功耗單電源滿幅度運(yùn)算放大器） |
| 文件頁(yè)數(shù)： | 16/20頁(yè) |
| 文件大小： | 487K |
| 代理商： | OP491 |
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OP191/OP291/OP491
REV. 0
–16–
A +3 V, Cold Junction Compensated T hermocouple Amplifier
T he OP291’s low supply operation makes it ideal for +3 V
battery powered applications such as the thermocouple amplifier
shown in Figure 64. T he K -type thermocouple terminates in an
isothermal block where the junctions’ ambient temperature is
continuously monitored using a simple 1N914 diode. T he
diode corrects the thermal EMF generated in the junctions by
feeding a small voltage, scaled by the 1.5 M
and 475
resistors, to the op amp.
T o calibrate this circuit, immerse the thermocouple measuring
junction in a 0
°
C ice bath, and adjust the 500
pot to zero
volts out. Next, immerse the thermocouple in a 250
°
C tem-
perature bath or oven and adjust the Scale Adjust pot for an
output voltage of 2.50 V. Within this temperature range, the
K -type thermocouple is accurate to within
±
3
°
C without
linearization.
8
1
4
3
2
OP291
4.99k
1%
500
10-TURN
ZERO
ADJUST
24.3k
1%
7.15k
1%
24.9k
1%
2.1k
1%
475
1%
1.5M
1%
1N914
AL
CR
ISOTHERMAL
BLOCK
ALUMEL
CHROMEL
COLD
JUNCTIONS
K-TYPE
THERMOCOUPLE
40.7
μ
V/
°
C
10k
3.0V
AD589
1.33M
20k
SCALE
ADJUST
V
OUT
0V = 0
C
3V = 300
°
C
1.235V
11.2mV
Figure 64. A 3 V, Cold J unction Compensated Thermo-
couple Amplifier
Single Supply, Direct Access Arrangement for Modems
An important building block in modems is the telephone line
interface. In the circuit shown in Figure 65, a direct access
arrangement is utilized for transmitting and receiving data from
the telephone line. Amplifier A1 is the receiving amplifier, and
amplifiers A2 and A3 are the transmitters. T he forth amplifier,
A4, generates a pseudo ground half way between the supply
voltage and ground. T his pseudo ground is needed for the ac
coupled bipolar input signals.
Figure 65. Single Supply Direct Access Arrangement for
Modems
T he transmit signal, T X A, is inverted by A2 and then re-
inverted by A3 to provide a differential drive to the transformer,
where each amplifier supplies half the drive signal. T his is
needed because of the smaller swings associated with a single
supply as opposed to a dual supply. Amplifier A1 provides
some gain for the received signal, and it also removes the
transmit signal present at the transformer from the receive
signal. T o do this, the drive signal from A2 is also fed to the
noninverting input of A1 to cancel the transmit signal from the
transformer. T he OP491’s bandwidth of 3 MHz and rail-to-rail
output swings ensures that it can provide the largest possible
drive to the transformer at the frequency of transmission.
RXA
1/4
OP491
1/4
OP491
1/4
OP491
37.4k
A1
14
13
12
3.3k
0.0047μF
A2
8
10
9
20k
, 1%
475
, 1%
0.033μF
37.4k
, 1%
390pF
750pF
0.1μF
0.1μF
A3
7
6
5
T1
1:1
5.1V TO 6.2V
ZENER 5
1/4
OP491
1
4
2
3
11
A4
100k
100k
+3V OR +5V
10μF
0.1μF
20k
, 1%
20k
, 1%
20k
1%
TXA
20k
1%
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP491GBC | 制造商:Analog Devices 功能描述: |
| OP491GP | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O ±6V/12V 14-Pin PDIP N 制造商:Rochester Electronics LLC 功能描述:RAIL-RAIL SINGLE SUPPLY - Bulk 制造商:Analog Devices 功能描述:OPERATIONAL AMPLIFIER IC NUMBER OF CIRCU |
| OP491GPZ | 功能描述:IC OPAMP GP R-R 3MHZ QUAD 14DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| OP491GPZ | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC |
| OP491GRU | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:OP-AMP|QUAD|BICMOS|TSSOP|14PIN|PLASTIC |
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