参数资料
| 型号： | AD8629ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CHOPPER R-R DUAL 8SOIC |
| 标准包装： | 98 |
| 放大器类型： | 零漂移 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 1 V/µs |
| 增益带宽积： | 2.5MHz |
| -3db带宽： | 2.5MHz |
| 电流 - 输入偏压： | 30pA |
| 电压 - 输入偏移： | 1µV |
| 电流 - 电源： | 850µA |
| 电流 - 输出 / 通道： | 30mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5 V，±1.35 V ~ 2.5 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-SO |
| 包装： | 管件 |
| 产品目录页面： | 767 (CN2011-ZH PDF) |
Data Sheet
AD8628/AD8629/AD8630
Rev. J | Page 19 of 24
PRECISION CURRENT SHUNT SENSOR
A precision current shunt sensor benefits from the unique
attributes of auto-zero amplifiers when used in a differencing
configuration, as shown in Figure 63. Current shunt sensors are
used in precision current sources for feedback control systems.
They are also used in a variety of other applications, including
battery fuel gauging, laser diode power measurement and control,
torque feedback controls in electric power steering, and precision
power metering.
RS
0.1
SUPPLY
I
RL
100
100k
5V
100
100k
e = 1000 RS I
100mV/mA
AD8628
02
73
5-
0
60
C
Figure 63. Low-Side Current Sensing
In such applications, it is desirable to use a shunt with very low
resistance to minimize the series voltage drop; this minimizes
wasted power and allows the measurement of high currents
while saving power. A typical shunt might be 0.1 Ω. At measured
current values of 1 A, the output signal of the shunt is hundreds
of millivolts, or even volts, and amplifier error sources are not
critical. However, at low measured current values in the 1 mA
range, the 100 μV output voltage of the shunt demands a very
low offset voltage and drift to maintain absolute accuracy. Low
input bias currents are also needed, so that injected bias current
does not become a significant percentage of the measured current.
High open-loop gain, CMRR, and PSRR help to maintain the
overall circuit accuracy. As long as the rate of change of the
current is not too fast, an auto-zero amplifier can be used with
excellent results.
OUTPUT AMPLIFIER FOR HIGH PRECISION DACS
a 16-bit high precision DAC in a unipolar configuration. In this
case, the selected op amp needs to have a very low offset voltage
(the DAC LSB is 38 μV when operated with a 2.5 V reference)
to eliminate the need for output offset trims. The input bias
current (typically a few tens of picoamperes) must also be very
low because it generates an additional zero code error when
multiplied by the DAC output impedance (approximately 6 kΩ).
Rail-to-rail input and output provide full-scale output with very
little error. The output impedance of the DAC is constant and
code independent, but the high input impedance of the AD8628/
AD8629/AD8630 minimizes gain errors. The wide bandwidth
of the amplifiers also serves well in this case. The amplifiers,
with settling time of 1 μs, add another time constant to the
system, increasing the settling time of the output. The settling
time of the AD5541 is 1 μs. The combined settling time is
approximately 1.4 μs, as can be derived from the following
equation:
2
2
AD8628
S
t
DAC
t
TOTAL
t
02
73
5-
0
61
AD5541/AD5542
AD8628
DGND
*AD5542 ONLY
VDD REF(REFF*) REFS*
VOUT
SCLK
DIN
CS
AGND
5V
2.5V
UNIPOLAR
OUTPUT
LDAC*
0.1F
10F
0.1F
SERIAL
INTERFACE
Figure 64. AD8628 Used as an Output Amplifier
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8629ARZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier |
| AD8629ARZ-REEL | 功能描述:IC OPAMP CHOPPER R-R DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 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:带卷 (TR) |
| AD8629ARZ-REEL7 | 功能描述:IC OPAMP CHOPPER R-R DUAL 8SOIC 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 |
| AD8629D703L | 制造商:Analog Devices 功能描述:AEROSPACE ZERO DRIFT, SINGLE-SUPPLY, RAIL-TO-RAIL INPUT/OUTP - Rail/Tube |
| AD8629S | 制造商:AD 制造商全称:Analog Devices 功能描述:Zero-Drift, Single-Supply Rail-to-Rail Input/Output Operational Amplifier |
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