参数资料
| 型号： | OP491GPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R 3MHZ QUAD 14DIP |
| 标准包装： | 25 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.5 V/µs |
| 增益带宽积： | 3MHz |
| 电流 - 输入偏压： | 30nA |
| 电压 - 输入偏移： | 80µV |
| 电流 - 电源： | 260µA |
| 电流 - 输出 / 通道： | 16mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 12 V，±1.35 V ~ 6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 14-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 774 (CN2011-ZH PDF) |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| OP491GPZ | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC |
| OP491GRU | 制造商:未知厂家 制造商全称:未知厂家 功能描述:OP-AMP|QUAD|BICMOS|TSSOP|14PIN|PLASTIC |
| OP491GRU-REEL | 功能描述:IC OPAMP GP R-R 3MHZ 14TSSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| OP491GRUZ-REEL | 功能描述:IC OPAMP GP R-R 3MHZ 14TSSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| OP491GS | 功能描述:IC OPAMP GP R-R 3MHZ QUAD 14SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
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