參數(shù)資料
型號： AD652SQ
廠商： Analog Devices Inc
文件頁數(shù)： 18/28頁
文件大?。?/td> 779K
描述： IC V-F CONV SYNCH MONO 5V 16CDIP
標準包裝： 1
類型： 電壓至頻率
頻率 - 最大： 2MHz
全量程： ±25ppm/°C
線性： ±0.005%
安裝類型： 通孔
封裝/外殼： 16-CDIP（0.300"，7.62mm）
供應商設(shè)備封裝： 16-CDIP
包裝： 管件
AD652
 
Rev. C | Page 18 of 28
This can be shown in equation form, where fC is the AD654
output frequency and fOUT is the AD652 output frequency:
V
10
MHz
1
1
C
V
f =
 
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
V
10
2
C
2
OUT
f
V
f
 
(   )( )
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
V
10
V
10
2
MHz
1
2
1
OUT
V
V
f
 
f
OUT
 = V
1
 ?V
2
 ?5 kHz/V
2
The scope photo in Figure 24 shows V
1
 and V
2
 (top two traces)
and the output of the F-V (bottom trace).
V
1
V
2
V
OUT
 
Figure 24. Multiplier Waveforms
SINGLE-LINE MULTIPLEXED DATA TRANSMISSION
It is often necessary to measure several different signals and
relay the information to some remote location using a mini-
mum amount of cable. Multiple AD652 SVFC devices may be
used with a multiphase clock to combine these measurements
for serial transmission and demultiplexing. Figure 25 shows a
block diagram of a single-line multiplexed data transmission
system with high noise immunity. Figure 26, Figure 27, and
Figure 30 show the SVFC multiplexer, a representative means of
data transmission, and an SVFC demultiplexer respectively.
Multiplexer
Figure 30 shows the SVFC multiplexer. The clock inputs for the
several SVFC channels are generated by a TIM9904A 4-phase
clock driver, and the frequency outputs are combined by
strapping all the frequency output pins together (a wire OR
connection). The one-shot in the AD652 sets the pulse width of
the frequency output pulses to be slightly shorter than one
quarter of the clock period. Synchronization is achieved by
applying one of the four available phases to a fixed TTL one-
shot (121) and combining the output with external transistor.
The width of this sync pulse is shorter than the width of the
frequency output pulses to facilitate decoding the signal. The
RC lag network on the input of the one-shot provides a slight
delay between the rising edge of the clock and the sync pulse in
order to match the 150 ns delay of the AD652 between the
rising edge of the clock and the output pulse.
Transmitter
The multiplex signal can be transmitted in any manner suitable
to the task at hand. A pulse transformer or an opto-isolator can
provide galvanic isolation; extremely high voltage isolation or
transmission through severe RF environments can be accomp-
lished with a fiber optic link; telemetry can be achieved with a
radio link. The circuit shown in Figure 27 uses an EIA RS-422
standard for digital data transmission over a balanced line.
Figure 24 shows the waveforms of the four clock phases and the
multiplex output signal. Note that the sync pulse is present
every clock cycle, but the data pulses are no more frequent than
every other clock cycle since the maximum output frequency
from the SVFC is half the clock frequency. The clock frequency
used in this circuit is 819.2 kHz, which provides more than
16 bits of resolution if 100 ms gate time is allowed for counting
pulses of the decoded output frequencies.
 
AD652
V
IN1
AD652
V
IN2
AD652
V
IN3
ONE
SHOT
?SPAN class="pst AD652SQ_2632819_6">1  ?SPAN class="pst AD652SQ_2632819_6">2  ?SPAN class="pst AD652SQ_2632819_6">3  ?SPAN class="pst AD652SQ_2632819_6">4
CLK
GENERATOR
SVFC MULTIPLEXER
(SEE FIGURE 26)
AD652
?/DIV>
2
V
OUT1
AD652
?/DIV>
3
V
OUT2
AD652
?/DIV>
4
V
OUT3
SVFC
DEMUX
f1
f2
f3
SVFC DEMULTIPLEXER
(SEE FIGURE 30)
DEMULTIPLEXER FREQUENCY TO
VOLTAGE CONVERSION
(SEE FIGURE 31)
TRANSMISSION
LINK
TRANSMISSION
LINK
(SEE FIGURE 27)
 
Figure 25. Single-Line Multiplexed Data Transmission Block Diagram
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參數(shù)描述
AD652SQ/883B 功能描述:電壓頻率轉(zhuǎn)換及頻率電壓轉(zhuǎn)換 IC - SYNC V/F CONVERTER RoHS:否 制造商:Texas Instruments 全標度頻率:4000 KHz 線性誤差:+/- 1 % FSR 電源電壓-最大: 電源電壓-最小: 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 安裝風格:Through Hole 封裝 / 箱體:PDIP-14 封裝:Tube
AD652SQ/883B2 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter
AD652SQ2 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter
AD652SQ883B2 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter
AD652SW 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter
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