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参数资料
| 型号： | AD8436JCPZ-WP |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC CONV TRUE RMS-DC LP 20LFCSP |
| 产品培训模块： | Introduction to Analog RMS-to-DC Technology: Converters and Applications |
| 标准包装： | 64 |
| 电流 - 电源： | 325µA |
| 电源电压： | ±2.4 V ~ 18 V，4.8 V ~ 36 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-LFCSP-WQ（4x4） |
| 包装： | 托盘 - 晶粒 |
Data Sheet
The 16 kΩ resistor in the output converts the output current to
a dc voltage that can be connected to the output buffer or to the
circuit that follows. The output appears as a voltage source in
series with 16 kΩ. If a current output is desired, the resistor
connection to ground is left open and the output current is
applied to a subsequent circuit, such as the summing node of
a current summing amplifier. Thus, the core has both current
and voltage outputs, depending on the configuration. For a
voltage output with 0 Ω source impedance, use the output
buffer. The offset voltage of the buffer is 25 μV or 50 μV,
depending on the grade.
FET Input Buffer
Because the V-to-I input resistor value of the AD8436 rms core
is 8 k?, a high input impedance buffer is often used between
rms-dc converters and finite impedance sources. The optional
JFET input op amp minimizes attenuation and uncouples
common input amenities, such as resistive voltage dividers or
resistors used to terminate current transformers. The wide
bandwidth of the FET buffer is well matched to the rms core
bandwidth so that no information is lost due to serial band-
width effects. Although the input buffer consumes little current,
the buffer supply is independently accessible and can be
disconnected to reduce power.
Optional matched 10 k? input and feedback resistors are provided
on chip. Consult the Applications Information section to learn
AD8436
The output buffer can be configured as a single or two-pole low-
pass filter using circuits shown in the Applications Information
section. Residual output ripple is reduced, without affecting the
converted dc output. As the response approaches the low
frequency end of the bandwidth, the ripple rises, dependent on
the value of the averaging capacitor. Figure 27 shows the effects of
four combinations of averaging and filter capacitors. Although
the filter capacitor reduces the ripple for any given frequency, the
dc error is unaffected. Of course, a larger value averaging
capacitor can be selected, at a larger cost. The advantage of using
a low-pass filter is that a small value of filter capacitor, in
conjunction with the 16 k? output resistor, reduces ripple and
permits a smaller averaging capacitor, effecting a cost savings.
The recommended capacitor values for operation to 40 Hz are
10 μF for averaging and 3.3 μF for filter.
Dynamic Range
The AD8436 is a translinear rms-to-dc converter with exceptional
dynamic range. Although accuracy varies slightly more at the
extreme input values, the device still converts with no spurious
noise or dropout. Figure 25 is a plot of the rms/dc transfer function
near zero voltage. Unlike processor or other solutions, residual
errors at very low input levels can be disregarded for most
applications.
30
how these resistors can be used. The 3 dB bandwidth of the input
buffer is 2.7 MHz at 10 mV rms input and approximately 1.5 MHz
at 1 V rms. The amplifier gain and bandwidth are sufficient for
applications requiring modest gain or response enhancement to
a few hundred kilohertz (kHz), if desired. Configurations of the
input buffer are discussed in the Applications Information
section.
20
10
0
AD8436
SOLUTION
ΔΣ OR OTHER DIGITAL
SOLUTIONS CANNOT
WORK AT ZERO
VOLTS
Precision Output Buffer
–30
–20
–10 0 10
INPUT VOLTAGE (mV DC)
20
30
The precision output buffer is a bipolar input amplifier, laser
trimmed to cancel input offset voltage errors. As with the input
buffer, the supply current is very low (<50 μA, typically), and the
power can be disconnected for power savings if the buffer is not
needed. Be sure that the noninverting input is also disconnected
from the core output (OUT) if the buffer supply pin is discon-
nected. Although the input current of the buffer is very low,
a laser-trimmed 16 kΩ resistor, connected in series with the
inverting input, offsets any self-bias offset voltage.
Rev. B | Page 11 of 24
Figure 25. DC Transfer Function near Zero
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD843A | 制造商:AD 制造商全称:Analog Devices 功能描述:34 MHz, CBFET Fast Settling Op Amp |
| AD843AQ | 功能描述:IC OPAMP GP 34MHZ 50MA 8CDIP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包装:带卷 (TR) |
| AD843B | 制造商:AD 制造商全称:Analog Devices 功能描述:34 MHz, CBFET Fast Settling Op Amp |
| AD843BH | 制造商:Analog Devices 功能描述:OP Amp Single GP 制造商:Rochester Electronics LLC 功能描述:FAST SETTLING H.S. OP AMP - Bulk |
| AD843BHZ | 制造商:Analog Devices 功能描述:OP Amp Single GP 制造商:Analog Devices 功能描述:OP AMP SGL GP 18V 12PIN TO-8 - Rail/Tube |
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