参数资料
型号: AD8436ACPZ-R7
厂商: Analog Devices Inc
文件页数: 15/24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: 1
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: 标准包装
其它名称: AD8436ACPZ-R7DKR
Data Sheet
2C
10μF
AD8436
CORE
OGND
OUT
16k?
9
16k?
C
12
13
OBUFIN+
16k?
OBUFIN–
+
14
OBUFOUT
4.7μF
2
RMS
19
CAV
AD8436
17
VCC
OUT 9
8
3
IBUFOUT
16k?
Figure 36. Output Buffer Amplifier Configured as a Two-Pole, Sallen-Key
Low-Pass Filter
0.47μF
4
5
IBUFIN–
IBUFIN+
OGND
VEE
IGND 11
4.7μF
Configure the output buffer (see Figure 37) to invert dc output.
10M?
8
10
CORE
OGND
8
OUT
16k?
9
32.4k?
13
12
16k?
OBUFIN–
OBUFIN+
+
14
OBUFOUT
Figure 39. Connections for Single Supply Operation
Recommended Application
Figure 40 shows a circuit for a typical application for frequencies
Figure 37. Inverting Output Configuration
Current Output Option
If a current output is required, connect the current output,
OUT, to the destination load. To maximize precision, provide a
as low as power line, and above. The recommended averaging,
crest factor and LPF capacitor values are 10 μF, 0.1 μF and
3.3 μF. Refer to the Using the Output Buffer section if additional
low-pass filtering is required.
VCC
+
means for external calibration to replace the internal trimmed
resistor, which is bypassed. This configuration is useful for conve-
nient summing of the AD8436 result with another voltage, or
for polarity inversion.
10μF
0.1μF
20 19 18
SUM CAVG CCF
1 DNC
17 16
VCC IBUFV+
OBUFV+
15
CAVG
19
CCF
18
2
RMS
AD8436
OBUFOUT
14
DC
OUT
RMS 2
8 k?
CORE
DIRECTION OF
DC OUTPUT
CURRENT
9
OUT
2k?
(OPTIONAL)
15k?
10μF
3
4
IBUFOUT
IBUFIN–
OBUFIN–
OBUFIN+
13
12
OGND
8
16k?
DO NOT CONNECT FOR
CURRENT OUTPUT
+
32.4k?
INVERTED DC
VOLTAGE
OUTPUT
AC IN
0.47μF
10MΩ
5
IBUFIN+
IBUFGN DNC OGND OUT
6 7 8 9
IGND
VEE
10
VEE
11
Figure 38. Connections for Current Output Showing Voltage Inversion
Single Supply
Connections for single supply operation are shown in Figure 39
and are similar to those for dual power supply when the device is
ac-coupled. The analog inputs are all biased to half the supply
voltage, but the output remains referred to ground because the
output of the AD8436 is a current source. An additional bypass
connection is required at IGND to suppress ambient noise.
3.3μF
Figure 40. Typical Application Circuit
Converting to Average Rectified Value
To configure the AD8436 for rectified average instead of rms
conversion, simply reduce the value of CAVG to 470 pF (see
Figure 41). To enable both modes of operation, insert a switch
between capacitor CAVG and Pin CAVG.
Rev. B | Page 15 of 24
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