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参数资料
| 型号： | AD536ASD |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟专用变换器 |
| 英文描述： | Integrated Circuit True RMS-to-DC Converter |
| 中文描述： | RMS TO DC CONVERTER, 0.09 MHz, CDIP14 |
| 封装： | HERMETIC SEALED, SIDE BRAZED, CERAMIC, TO-116, DIP-14 |
| 文件页数： | 6/8页 |
| 文件大小： | 151K |
| 代理商： | AD536ASD |
REV. B
AD536A
–
6
–
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 I
1
, by the active rectifier A
1
, A
2
. I
1
drives one
input of the squarer/divider, which has the transfer function:
4
=
I
12
/
I
3
The output current, I
4
, 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
AV
time constant is much
greater than the longest period of the input signal, then I
4
is
effectively averaged. The current mirror returns a current I
3
,
which equals Avg. [I
4
], back to the squarer/divider to complete
the implicit rms computation. Thus:
[
I
4
=
Avg
.
I
1
2
/
I
4
]
=
I
1
rms
Figure 9. Simplified Schematic
The current mirror also produces the output current, I
OUT,
which equals 2I
4
. I
OUT
can 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
IN
rms
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 I
3
.
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 k
; thus some applications may require an additional
buffer amplifier if this output is desired.
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
V
IN
and adjusting R1, accordingly. Note that adjusting R5 for
the proper gain automatically gives the correct temperature
compensation.
Figure 10. dB Connection
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD536ASD/883B | 功能描述:直流/直流开关转换器 RMS/DC CONVERTER IC RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| AD536ASD883B | 制造商:ANALOG DEV 功能描述:DIP-14PIN GOLD |
| AD536ASE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| AD536ASE/883B | 功能描述:直流/直流开关转换器 RMS/DC CONVERTER IC RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| AD536ASH | 功能描述:IC TRUE RMS/DC CONV TO-100-10 RoHS:否 类别:集成电路 (IC) >> PMIC - RMS 至 DC 转换器 系列:- 标准包装:46 系列:- 电流 - 电源:1.2mA 电源电压:±18 V，36 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装:管件 |
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