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| 型号： | AD8436JCPZ-WP |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/24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 |
AD8436
APPLICATIONS INFORMATION
USING THE AD8436
This section describes the power supply and feature options,
as well as the function and selection of averaging and filter
capacitor values. Averaging and filtering options are shown
graphically and apply to all circuit configurations.
Averaging Capacitor Considerations—RMS Accuracy
Typical AD8436 applications require only a single external
The function of the averaging capacitor is to compute the mean
Data Sheet
Ripple is reduced by increasing the value of the averaging capacitor,
or by postconversion filtering. Ripple reduction following
conversion is far more efficient because the ripple average value
has been converted to its rms value. Capacitor values for post-
conversion filtering are significantly less than the equivalent
averaging capacitor value for the same level of ripple reduction.
This approach requires only a single capacitor connected to the
OUT pin (see Figure 26). The capacitor value correlates to the
simple frequency relation of ? π R-C, where R is fixed at 16 k?.
(that is, average value) of the sum of the squares. Averaging
(that is, integration) follows the rms core, where the input
current is squared. The mean value is the average value of the
squared input voltage over several input waveform periods.
The rms error is directly affected by the number of periods
CORE
OGND
8
OUT
16k?
9
DC OUTPUT
CLPF
averaged, as is the resultant peak-to-peak ripple.
The result of the conversion process is a dc component and a
ripple component whose frequency is twice that of the input. The
rms conversion accuracy depends on the value of CAVG, so the
value selected need only be large enough to average enough periods
at the lowest frequency of interest to yield the required rms
accuracy.
capacitor values. To use Figure 28, simply locate the frequency
of interest and acceptable rms error on the horizontal and
vertical scales, respectively. Then choose or estimate the next
highest capacitor value adjacent to where the frequency and
error lines intersect (for an example, see the orange circle in
Figure 26. Simple One-Pole Post Conversion Filter
As seen in Figure 27, CAVG alone determines the rms error,
and CLPF serves purely to reduce ripple. Figure 27 shows a
constant rms error for CLPF values of 0.33 μF and 3.3 μF; only
the ripple is affected.
1
CAVG = 10μF
CLPF = 0.33μF OR 3.3μF
0
–1
–2
–3
–4
–5
Post Conversion Ripple Reduction Filter
Input rectification included in the AD8436 introduces a residual
ripple component that is dependent on the value of CAVG and
–6
–7
–8
CAVG = 1μF
CLPF = 0.33μF OR 3.3μF
twice the input signal frequency for symmetrical input wave-
forms. For sampling applications such as a high resolution ADC,
the ripple component may cause one or more LSBs to cycle, and
low value display numerals to flash.
–9
–10
10 100 1k
FREQUENCY (Hz)
Figure 27. RMS Error vs. Frequency for Two Values of CAVG and CLPF
(Note that only CAVG value affects rms error; CLPF has no effect.)
μF
0
50
–0.5
SEE
TEXT
–1.0
CAVG = 0.22μF
–1.5
–2.0
2
10
100
1k
FREQUENCY (Hz)
Figure 28. Conversion Error vs. Frequency for Various Values of CAVG
Rev. B | Page 12 of 24
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相关代理商/技术参数 |
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|---|---|
| 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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