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参数资料
| 型号： | OP295GSZ-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运算放大器 |
| 英文描述： | Dual Rail-to-Rail Operational Amplifiers; Package: SOIC; No of Pins: 8; Temperature Range: Industrial |
| 中文描述： | DUAL OP-AMP, 800 uV OFFSET-MAX, 0.085 MHz BAND WIDTH, PDSO8 |
| 封装： | ROHS COMPLIANT, MS-012AA, SOIC-8 |
| 文件页数： | 3/16页 |
| 文件大小： | 384K |
| 代理商： | OP295GSZ-REEL7 |
OP295/OP495
Rev. F | Page 11 of 16
V+
–
+
–
+
5
3
2
1
6
8
4
7
1/2
OP295/
OP495
1/2
OP295/
OP495
+
–
VIN
VO
R4
100k
R3
20k
R2
20k
R1
100k
VREF
RG
VO =
(5+ 200k) VIN+VREF
RG
00
33
1-
0
22
Figure 23. Single-Supply Instrumentation Amplifier
Resistor RG sets the gain of the instrumentation amplifier.
Minimum gain is 6 (with no RG). All resistors should be matched
in absolute value as well as temperature coefficient to maximize
common-mode rejection performance and minimize drift. This
instrumentation amplifier can operate from a supply voltage as
low as 3 V.
SINGLE-SUPPLY RTD THERMOMETER AMPLIFIER
This RTD amplifier takes advantage of the rail-to-rail swing of
the OP295/OP495 to achieve a high bridge voltage in spite of a
low 5 V supply. The OP295/OP495 amplifier servos a constant
200 μA current to the bridge. The return current drops across
the parallel resistors 6.19 kΩ and 2.55 MΩ, developing a voltage
that is servoed to 1.235 V, which is established by the AD589
band gap reference. The 3-wire RTD provides an equal line
resistance drop in both 100 Ω legs of the bridge, thus improving
the accuracy.
The AMP04 amplifies the differential bridge signal and converts
it to a single-ended output. The gain is set by the series resis-
tance of the 332 Ω resistor plus the 50 Ω potentiometer. The
gain scales the output to produce a 4.5 V full scale. The 0.22 μF
capacitor to the output provides a 7 Hz low-pass filter to keep
noise at a minimum.
ZERO ADJ
AD589
37.4k
5V
1.235
3
2
4
5
6
8
1
7
5V
AMP04
50
332
0.22F
VO
–
+
2
3
1
+
–
200
10-TURNS
26.7k
0.5%
26.7k
0.5%
100
RTD
100
0.5%
2.55M
1%
6.19k
1%
1/2
OP295/
OP495
4.5V = 450°C
0V = 0°C
0
03
31
-0
23
Figure 24. Low Power RTD Amplifier
COLD JUNCTION COMPENSATED, BATTERY-
POWERED THERMOCOUPLE AMPLIFIER
The 150 μA quiescent current per amplifier consumption of the
OP295/OP495 makes them useful for battery-powered temperature
measuring instruments. The K-type thermocouple terminates
into an isothermal block where the terminated junctions’ ambient
temperatures can be continuously monitored and corrected by
summing an equal but opposite thermal EMF to the amplifier,
thereby canceling the error introduced by the cold junctions.
AD589
ALUMEL
CHROMEL
AL
CR
1N914
24.9k
1.235V
9V
1.33M
20k
2
3
4
8
–
+
–
+
–
+
1
COLD
JUNCTIONS
ISOTHERMAL
BLOCK
K-TYPE
THERMOCOUPLE
40.7V/°C
VO
5V = 500°C
0V = 0°C
OP295/
OP495
SCALE
ADJUST
7.15k
1%
1.5M
1%
24.9k
1%
475
1%
2.1k
1%
24.3k
1%
4.99k
1%
500
10-TURN
ZERO
ADJUST
00
33
1-
0
24
Figure 25. Battery-Powered, Cold-Junction Compensated
Thermocouple Amplifier
To calibrate, immerse the thermocouple measuring junction in
a 0°C ice bath and adjust the 500 Ω zero-adjust potentiometer
to 0 V out. Then immerse the thermocouple in a 250°C tem-
perature bath or oven and adjust the scale-adjust potentiometer
for an output voltage of 2.50 V, which is equivalent to 250°C.
Within this temperature range, the K-type thermocouple is
quite accurate and produces a fairly linear transfer characteristic.
Accuracy of ±3°C is achievable without linearization.
Even if the battery voltage is allowed to decay to as low as 7 V,
the rail-to-rail swing allows temperature measurements to 700°C.
However, linearization may be necessary for temperatures above
250°C, where the thermocouple becomes rather nonlinear. The
circuit draws just under 500 μA supply current from a 9 V
battery.
5 V ONLY, 12-BIT DAC THAT SWINGS 0 V TO 4.095 V
Figure 26 shows a complete voltage output DAC with wide
output voltage swing operating off a single 5 V supply. The
serial input, 12-bit DAC is configured as a voltage output device
with the 1.235 V reference feeding the current output pin (IOUT)
of the DAC. The VREF, which is normally the input, now becomes
the output.
The output voltage from the DAC is the binary weighted voltage
of the reference, which is gained up by the output amplifier such
that the DAC has a 1 mV per bit transfer function.
相关PDF资料 |
PDF描述 |
|---|---|
| OP296GS-REEL | Micropower, Rail-to-Rail Input and Output Operational Amplifiers; Package: SOIC; No of Pins: 8; Temperature Range: Industrial |
| OP296HRU-REEL | Micropower, Rail-to-Rail Input and Output Operational Amplifiers; Package: TSSOP; No of Pins: 8; Temperature Range: Industrial |
| OP296GSZ | Micropower, Rail-to-Rail Input and Output Operational Amplifiers; Package: SOIC; No of Pins: 8; Temperature Range: Industrial |
| OP296GSZ-REEL | Micropower, Rail-to-Rail Input and Output Operational Amplifiers; Package: SOIC; No of Pins: 8; Temperature Range: Industrial |
| OP296GSZ-REEL7 | Micropower, Rail-to-Rail Input and Output Operational Amplifiers; Package: SOIC; No of Pins: 8; Temperature Range: Industrial |
相关代理商/技术参数 |
参数描述 |
|---|---|
| OP296 | 制造商:AD 制造商全称:Analog Devices 功能描述:Micropower, Rail-to-Rail Input and Output Operational Amplifiers |
| OP296A | 功能描述:红外发射源 Infrared 890nm RoHS:否 制造商:Fairchild Semiconductor 波长:880 nm 射束角:+/- 25 辐射强度: 最大工作温度:+ 100 C 最小工作温度:- 40 C 封装 / 箱体:Side Looker 封装:Bulk |
| OP296B | 功能描述:红外发射源 Infrared 890nm RoHS:否 制造商:Fairchild Semiconductor 波长:880 nm 射束角:+/- 25 辐射强度: 最大工作温度:+ 100 C 最小工作温度:- 40 C 封装 / 箱体:Side Looker 封装:Bulk |
| OP296C | 功能描述:红外发射源 Infrared 890nm RoHS:否 制造商:Fairchild Semiconductor 波长:880 nm 射束角:+/- 25 辐射强度: 最大工作温度:+ 100 C 最小工作温度:- 40 C 封装 / 箱体:Side Looker 封装:Bulk |
| OP296GP | 制造商:Analog Devices 功能描述:OP AMP DUAL CMOS UPOWER DIP8 296 |
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