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AD536ASCHIPS

更新时间： 2024-02-01 08:34:52

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
8页	152K
描述
Integrated Circuit True RMS-to-DC Converter

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技术参数
数据手册

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AD536ASCHIPS 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
Reach Compliance Code：	not_compliant	风险等级：	5.92
转换器类型：	RMS TO DC CONVERTER	JESD-30 代码：	R-XDIP-T14
JESD-609代码：	e0	端子数量：	14
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装主体材料：	CERAMIC	封装代码：	DIP
封装等效代码：	DIP14,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	电源：	5/36/+-3/+-18 V
子类别：	Analog Special Function Converters	最大压摆率：	2 mA
表面贴装：	NO	技术：	BIPOLAR
温度等级：	MILITARY	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	Base Number Matches：	1

AD536ASCHIPS 数据手册

AD536A

Figure 9 is a simplified schematic of the AD536A; it is subdi-

vided into four major sections: absolute value circuit (active

rectifier), squarer/divider, current mirror, and buffer amplifier.

The input voltage, V_IN, which can be ac or dc, is converted to a

unipolar current I₁, by the active rectifier A₁, A₂. I₁drives one

input of the squarer/divider, which has the transfer function:

The current mirror also produces the output current, I_OUT,

which equals 2I₄. I_OUTcan be used directly or converted to a

voltage with R2 and buffered by A4 to provide a low impedance

voltage output. The transfer function of the AD536A thus

results:

V_OUT= 2R2 I rms = V_INrms

I₄= I₁²/I₃

The dB output is derived from the emitter of Q3, since the

voltage at this point is proportional to –log V_IN. Emitter fol-

lower, Q5, buffers and level shifts this voltage, so that the dB

output voltage is zero when the externally supplied emitter

current (I_REF) to Q5 approximates I₃.

The output current, I₄, of the squarer/divider drives the current

mirror through a low-pass filter formed by R1 and the externally

connected capacitor, C_AV. If the R1, C_AVtime constant is much

greater than the longest period of the input signal, then I₄is

effectively averaged. The current mirror returns a current I₃,

which equals Avg. [I₄], back to the squarer/divider to complete

the implicit rms computation. Thus:

CONNECTIONS FOR dB OPERATION

A powerful feature added to the AD536A is the logarithmic or

decibel output. The internal circuit computing dB works accu-

rately over a 60 dB range. The connections for dB measure-

ments are shown in Figure 10. The user selects the 0 dB level by

adjusting R1, for the proper 0 dB reference current (which is set

to exactly cancel the log output current from the squarer-divider

at the desired 0 dB point). The external op amp is used to pro-

vide a more convenient scale and to allow compensation of the

+0.33%/°C scale factor drift of the dB output pin. The special

T.C. resistor, R2, is available from Tel Labs in Londonderry,

N.H. (model Q-81) or from Precision Resistor Inc., Hillside,

N.J. (model PT146). The averaged temperature coefficients of

resistors R2 and R3 develop the +3300 ppm needed to reverse

compensate the dB output. The linear rms output is available at

Pin 8 on DIP or Pin 10 on header device with an output imped-

ance of 25 kΩ; thus some applications may require an additional

buffer amplifier if this output is desired.

I₄= Avg. I₁/I₄= I₁rms

[

]

dB Calibration:

1. Set V_IN= 1.00 V dc or 1.00 V rms

2. Adjust R1 for dB out = 0.00 V

3. Set V_IN= +0.1 V dc or 0.10 V rms

4. Adjust R5 for dB out = –2.00 V

Any other desired 0 dB reference level can be used by setting

Figure 9. Simplified Schematic

V_INand adjusting R1, accordingly. Note that adjusting R5 for

the proper gain automatically gives the correct temperature

compensation.

Figure 10. dB Connection

–6–

REV. B

1...3 4 567 8

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与AD536ASCHIPS相关器件

型号	品牌	描述	获取价格	数据表
AD536ASD	ADI	Integrated Circuit True RMS-to-DC Converter	获取价格
AD536ASD/883B	ADI	Integrated Circuit True RMS-to-DC Converter	获取价格
AD536ASE	ADI	Integrated Circuit True RMS-to-DC Converter	获取价格
AD536ASE/883B	ADI	Integrated Circuit True RMS-to-DC Converter	获取价格
AD536ASH	ADI	Integrated Circuit True RMS-to-DC Converter	获取价格
AD536ASH/883B	ADI	Integrated Circuit True RMS-to-DC Converter	获取价格

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