參數(shù)資料
型號(hào)： OP491GSZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/24頁(yè)
文件大小： 0K
描述： IC OPAMP GP R-R 3MHZ QUAD 14SOIC
標(biāo)準(zhǔn)包裝： 1,000
放大器類型： 通用
電路數(shù)： 4
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.5 V/µs
增益帶寬積： 3MHz
電流 - 輸入偏壓： 30nA
電壓 - 輸入偏移： 80µV
電流 - 電源： 260µA
電流 - 輸出 / 通道： 16mA
電壓 - 電源，單路/雙路(±)： 2.7 V ~ 12 V，±1.35 V ~ 6 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 14-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 14-SOIC
包裝： 帶卷 (TR)
OP191/OP291/OP491
Rev. E | Page 21 of 24
A 3 V, COLD JUNCTION COMPENSATED
THERMOCOUPLE AMPLIFIER
The OP291 low supply operation makes it ideal for 3 V battery-
powered applications such as the thermocouple amplifier
shown in Figure 70. The K-type thermocouple terminates in an
isothermal block where the junction ambient temperature is
continuously monitored using a simple 1N914 diode. The diode
corrects the thermal EMF generated in the junctions by feeding
a small voltage, scaled by the 1.5 MΩ and 475 Ω resistors, to the
op amp.
To calibrate this circuit, immerse the thermocouple measuring
junction in a 0°C ice bath and adjust the 500 Ω potentiometer
to 0 V out. Next, immerse the thermocouple in a 250°C
temperature bath or oven and adjust the scale adjust
potentiometer 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
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
40.7μV/°C
10k
3.0V
AD589
1.33M 20k
SCALE
ADJUST
VOUT
0V = 0°C
3V = 300°C
1.235V
11.2mV
4.99k
1%
00294-
074
1/2
Figure 70. A 3 V, Cold Junction Compensated Thermocouple 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 71, a direct access
arrangement is used to transmit and receive data from the
telephone line. Amplifier A1 is the receiving amplifier;
Amplifier A2 and Amplifier A3 are the transmitters. The fourth
amplifier, A4, generates a pseudo ground halfway between the
supply voltage and ground. This pseudo ground is needed for
the ac-coupled bipolar input signals.
The transmit signal, TXA, is inverted by A2 and then reinverted
by A3 to provide a differential drive to the transformer, where
each amplifier supplies half the drive signal. This 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 received signal. To do this,
the drive signal from A2 is also fed to the noninverting input of
A1 to cancel the transmit signal from the transformer.
RXA
1/4
OP491
37.4k
A1
3.3k
0.0047μF
A2
20k,1%
475,1%
0.033μF
37.4k,1%
390pF
750pF
0.1μF
A3
T1
1:1
5.1V TO 6.2V
ZENER 5
A4
100k
3V OR 5V
10μF0.1μF
20k,1%
TXA
20k,1%
13
12
14
8
10
9
1/4
OP491
7
6
5
1/4
OP491
3
1
2
1/4
OP491
4
11
0
02
94
-07
5
Figure 71. Single-Supply, Direct Access Arrangement for Modems
The OP491 bandwidth of 3 MHz and rail-to-rail output swings
ensure that it can provide the largest possible drive to the
transformer at the frequency of transmission.
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