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参数资料
| 型号： | OP295GSZ-REEL |
| 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： | 2/16页 |
| 文件大小： | 384K |
| 代理商： | OP295GSZ-REEL |
OP295/OP495
Rev. F | Page 10 of 16
Finally, the potentiometer, R8, is needed to adjust the offset
voltage to null it to zero. Similar performance can be obtained
using an OP90 as the output amplifier with a savings of about
185 μA of supply current. However, the output swing does not
include the positive rail, and the bandwidth reduces to approxi-
mately 250 Hz.
Table 6. Single-Supply Low Noise Preamp Performance
IC = 1.85 mA
IC = 0.5 mA
R1
270 Ω
1.0 kΩ
R3, R4
200 Ω
910 Ω
en @ 100 Hz
3.15 nV/√Hz
8.6 nV/√Hz
en @ 10 Hz
4.2 nV/√Hz
10.2 nV/√Hz
ISY
4.0 mA
1.3 mA
IB
11 μA
3 μA
Bandwidth
1 kHz
Closed-Loop Gain
1000
DRIVING HEAVY LOADS
The OP295/OP495 are well suited to drive loads by using a
power transistor, Darlington, or FET to increase the current to
the load. The ability to swing to either rail can assure that the
device is turned on hard. This results in more power to the load
and an increase in efficiency over using standard op amps with
their limited output swing. Driving power FETs is also possible
with the OP295/OP495 because of their ability to drive capaci-
tive loads of several hundred picofarads without oscillating.
Without the addition of external transistors, the OP295/OP495
can drive loads in excess of ±15 mA with ±15 V or +30 V
supplies. This drive capability is somewhat decreased at lower
supply voltages. At ±5 V supplies, the drive current is ±11 mA.
Driving motors or actuators in two directions in a single-supply
application is often accomplished using an H bridge. The
principle is demonstrated in Figure 20. From a single 5 V
supply, this driver is capable of driving loads from 0.8 V to
4.2 V in both directions. Figure 21 shows the voltages at the
inverting and noninverting outputs of the driver. There is a
small crossover glitch that is frequency-dependent; it does not
cause problems unless used in low distortion applications, such
as audio. If this is used to drive inductive loads, diode clamps
should be added to protect the bridge from inductive kickback.
10k
1.67V
2N2222
OUTPUTS
2N2907
5V
10k
0 ≤ VIN ≤ 2.5V 5k
–
+
–
+
0
033
1-
0
19
Figure 20. H Bridge
10
90
100
0%
2V
1ms
00
33
1-
0
2
0
Figure 21. H Bridge Outputs
DIRECT ACCESS ARRANGEMENT
The OP295/OP495 can be used in a single-supply direct access
arrangement (DAA), as shown in Figure 22. This figure shows
a portion of a typical DM capable of operating from a single 5 V
supply, and it may also work on 3 V supplies with minor modi-
fications. Amplifier A2 and Amplifier A3 are configured so that
the transmit signal, TxA, is inverted by A2 and is not inverted
by A3. This arrangement drives the transformer differentially so
the drive to the transformer is effectively doubled over a single
amplifier arrangement. This application takes advantage of the
ability of the OP295/OP495 to drive capacitive loads and to save
power in single-supply applications.
–
+
–
+
2.5V REF
A3
750pF
A1
37.4k
390pF
RxA
TxA
A2
3.3k
20k
475
22.1k
20k
0.033F
1:1
–
+
0.0047F
OP295/
OP495
OP295/
OP495
OP295/
OP495
0.1F
00
33
1-
0
21
Figure 22. Direct Access Arrangement
SINGLE-SUPPLY INSTRUMENTATION AMPLIFIER
The OP295/OP495 can be configured as a single-supply
instrumentation amplifier, as shown in Figure 23. For this
example, VREF is set equal to V+/2, and VO is measured with
respect to VREF. The input common-mode voltage range
includes ground, and the output swings to both rails.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| OP295GSZ-REEL7 | 功能描述:IC OPAMP GP R-R 85KHZ DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
| 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 |
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