参数资料
| 型号： | OP293FSZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 35KHZ DUAL 8SOIC |
| 设计资源： | 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145) |
| 标准包装： | 1 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.015 V/µs |
| 增益带宽积： | 35kHz |
| 电流 - 输入偏压： | 20nA |
| 电压 - 输入偏移： | 250µV |
| 电流 - 电源： | 30µA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | 1.7 V ~ 36 V，±0.85 V ~ 18 V |
| 工作温度： | -40°C ~ 125°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-SOIC |
| 包装： | 标准包装 |
| 产品目录页面： | 768 (CN2011-ZH PDF) |
| 其它名称： | OP293FSZ-REEL7DKR |
REV. B
OP193/OP293/OP493
–11–
6
5
7
4
1
2
3
V–
V+
OP193
100k
Figure 5. High Resolution Offset Nulling Circuit
A Micropower False-Ground Generator
Some single-supply circuits work best when inputs are biased
above ground, typically at 1/2 of the supply voltage. In these
cases a false ground can be created by using a voltage divider
buffered by an amplifier. One such circuit is shown in Figure 6.
This circuit will generate a false-ground reference at 1/2 of the
supply voltage, while drawing only about 27
A from a 5 V supply.
The circuit includes compensation to allow for a 1
F bypass
capacitor at the false-ground output. The benefit of a large
capacitor is that not only does the false ground present a very low
dc resistance to the load, but its ac impedance is low as well. The
OP193 can both sink and source more than 5 mA, which improves
recovery time from transients in the load current.
6
7
2
3
10k
OP193
100
4
5V OR 12V
0.022 F
1 F
240k
1 F
2.5V OR 6V
Figure 6. A Micropower False-Ground Generator
A Battery-Powered Voltage Reference
The circuit of Figure 7 is a battery-powered voltage reference
that draws only 17
A of supply current. At this level, two AA
alkaline cells can power this reference for more than 18 months.
At an output voltage of 1.23 V @ 25
°C, drift of the reference is
only 5.5
V/°C over the industrial temperature range. Load
regulation is 85
V/mA with line regulation at 120 V/V.
Design of the reference is based on the Brokaw bandgap core
technique. Scaling of resistors R1 and R2 produces unequal
currents in Q1 and Q2. The resulting
VBE across R3 creates a
temperature-proportional voltage (PTAT) which, in turn, pro-
duces a larger temperature-proportional voltage across R4 and
R5, V1. The temperature coefficient of V1 cancels (first order)
the complementary to absolute temperature (CTAT) coefficient
of VBE1. When adjusted to 1.23 V @ 25
°C, output voltage
tempco is at a minimum. Bandgap references can have start-up
problems. With no current in R1 and R2, the OP193 is beyond
its positive input range limit and has an undefined output state.
Shorting Pin 5 (an offset adjust pin) to ground forces the output
high under these circumstances and ensures reliable startup
without significantly degrading the OP193’s offset drift.
6
7
2
3
C1
1000pF
OP193
VBE2
4
R2
1.5M
Q1
VOUT
(1.23V @ 25°C)
5
R1
240k
V+
(2.5V TO 36V)
Q2
1
2
3
7
6
5
VBE1
MAT-01AH
VBE
R3 68k
R5 20k
OUTPUT
ADJUST
R4
130k
V1
Figure 7. A Battery-Powered Voltage Reference
A Single-Supply Current Monitor
Current monitoring essentially consists of amplifying the voltage
drop across a resistor placed in series with the current to be
measured. The difficulty is that only small voltage drops can be
tolerated, and with low precision op amps this greatly limits the
overall resolution. The single-supply current monitor of Figure
8 has a resolution of 10
A and is capable of monitoring 30 mA
of current. This range can be adjusted by changing the current
sense resistor R1. When measuring total system current, it may
be necessary to include the supply current of the current moni-
tor, which bypasses the current sense resistor, in the final result.
This current can be measured and calibrated (together with the
residual offset) by adjustment of the offset trim potentiometer,
R2. This produces a deliberate temperature dependent offset.
However, the supply current of the OP193 is also proportional
to temperature, and the two effects tend to track. Current in R4
and R5, which also bypasses R1, can be adjusted via a gain trim.
6
7
2
3
OP193
4
R2
100k
VOUT =
100mV/mA(ITEST)
5
V+
1
R2
9.9k
R3
100k
R5
100
R1
1
TO CIRCUIT
UNDER TEST
ITEST
Figure 8. Single-Supply Current Monitor
相关PDF资料 |
PDF描述 |
|---|---|
| KDE1235PFB3-8 MS | FAN 12VDC 35X10MM .7W 3.8CFM |
| 68046-335LF | CONN RCPT 70POS .100" DBL SMD |
| SFML-150-02-S-D | CONN RECPT 100POS 1.27MM GLD SMD |
| PBC10SFBN | CONN HEADER .100 SINGL STR 10POS |
| MMS-140-01-L-SH | CONN RCPT 2MM 40POS SGL HORZ PCB |
相关代理商/技术参数 |
参数描述 |
|---|---|
| OP293FSZ-REEL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision, Micropower Operational Amplifiers |
| OP293FSZ-REEL7-DASSAULT | 制造商:Analog Devices 功能描述: |
| OP293GBC | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision, Micropower Operational Amplifiers |
| OP294 | 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 |
| OP295 | 制造商:AD 制造商全称:Analog Devices 功能描述:DUAL/QUAD RAIL-TO-RAIL OPERATIONAL AMPLIFIERS |
发布紧急采购，3分钟左右您将得到回复。