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AD7750 데이터시트(PDF) 11 Page - Analog Devices

부품명 AD7750
상세설명  Product-to-Frequency Converter
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
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AD7750 데이터시트(HTML) 11 Page - Analog Devices

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AD7750
–11–
REV. 0
Table II. Maximum Output Frequencies
H(s) =
sRC
1 + sRC
R
C
R = 1M
C = 0.0707 F
Figure 16. HPF in Channel 1
C1
47nF
R2
33k
C2
33nF
VR2
200
R1
1M
PIN 7
VR1
100
R3
1.1k
860:1 ATTENUTATION
PIN 6
R4
1.1k
C3
33 F
Figure 17. Phase Lag Compensation on Channel 1 for
60 Hz Line Frequency
ADC 1
PGA
FOUT
F1
F2
ADC 2
τ
V1+
V1–
V2+
V2–
X2
G1
ACDC
HPF
PHASE LEAD OF
2.58 C AT 50Hz
DIGITAL
MULTIPLIER
LPF
CLKIN
FS
S2
S1
TIME DELAY 143 s
(CLKIN = 3.5795MHz)
2.58 C AT 50Hz
DIGITAL-TO-FREQUENCY BLOCK
COUNTER/ACCUMULATOR
DTF
Figure 15. Equivalent AD7750 Signal Processing Chain
e
d
o
MS
F2
S1
S
)
z
H
(
2
F
,
1
F
)
C
D
(
F
T
U
O
)
z
H
(
)
C
D
(
)
z
H
(
2
F
,
1
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A
(
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T
U
O
)
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H
(
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A
(
00
0
0
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.
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±
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.
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.
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Digital-to-Frequency Converter (DTF)
After they have been filtered, the outputs of the two sigma-delta
modulators are fed into a digital multiplier. The output of the
multiplier is then low-pass filtered to obtain the real power
information. The output of the LPF enters a digital-to-frequency
converter whose output frequency is now proportional to the
real power. The DTF offers a range of output frequencies to
suit most power measurement applications. There is also a high
frequency output called FOUT, which can be used for calibra-
tion purposes. The output frequencies are determined by the
logic inputs FS, S2 and S1. This is explained in the section of
this data sheet called Determining the Output Frequencies of
the AD7750.
Figure 18 shows the waveforms of the various frequency out-
puts. The outputs F1 and F2 are the low frequency outputs
that can be used to directly drive a stepper motor or electrome-
chanical pulse counter. The F1 and F2 outputs provide two
alternating low going pulses. The pulsewidth is set at 275 ms
and the time between the falling edges of F1 and F2 is ap-
proximately half the period of F1. If, however, the period of
F1 and F2 falls below 550 ms (1.81 Hz) the pulsewidth of F1
and F2 is set to half the period. For example in Mode 3,
where F1 and F2 vary around 6.8 Hz, the pulsewidth would vary
from 1/2.(6.8+1.45) seconds to 1/2.(6.8–1.45) seconds—see
Table II.


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