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AD7750 Fiches technique(PDF) 9 Page - Analog Devices

No de pièce AD7750
Description  Product-to-Frequency Converter
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7750 Fiches technique(HTML) 9 Page - Analog Devices

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AD7750
–9–
REV. 0
DETERMINING THE OUTPUT FREQUENCIES OF THE
AD7750
FOUT, F1 and F2 are the frequency outputs of the AD7750. The
output frequencies of the AD7750 are a multiple of a binary
fraction of the master clock frequency CLKIN. This binary
fraction of the master clock is referred to as FMAX in this data
sheet. FMAX can have one of two values, FMAX1 and FMAX2,
depending on which mode of operation the AD7750 is in. The
operating modes of the AD7750 are selected by the logic inputs
FS, S2 and S1. The table below outlines the FMAX frequencies
and the transfer functions for the various operating modes of the
AD7750.
NOTES
1The variable k is proportional to the product of the rms differential input voltages on Channel 1 and Channel 2 (V
1 and V2).
k = (1.32
× V
1 × V2 × Gain)/V REF
2
2Applies to F
OUT only. The variable k is proportional to the instantaneous differential input voltage on Channel 1 (FS = 0, S1 = 1, S0 = 1) or the instantaneous differ-
ential voltage on Channel 2 (FS = 1, S1 = 1, S0 = 1), i.e., Channel Monitor Mode.
k = (0.81
× V)/V
REF
V = V1 × Gain or
V = V2 × 2
NOTE: V1 and V2 here refer to the instantaneous differential voltage on Channel 1 or Channel 2, not the rms value.
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Mode Description (Table I)
The section of Table I labeled Mode Description summarizes
the functional modes of the AD7750. The AD7750 has two
basic modes of operation, i.e., four and two quadrant multiplica-
tion. The diagram in Figure 14 is a graphical representation of
the transfer functions for two and four quadrant multiplication.
Four Quadrant Multiplication (Modes 0, 3, 4 and 7)
When the AD7750 is operating in its four quadrant multiplica-
tion mode the output pulse frequency on F1, F2 and FOUT
contains both sign and magnitude information. The magni-
tude information is indicated by the output frequency variation
(k.FMAX) from a center frequency (FMAX). The sign informa-
tion is indicated by the sign of the frequency variation around
FMAX. For example if the output frequency is equal to FMAX
k.FMAX then the magnitude of the product is given by k.FMAX
and it has a negative sign.
Two Quadrant Multiplication (Modes 1, 2, 5 and 6)
When operating in this mode the output pulse frequency only
contains magnitude information. Again as in the case of four
quadrant multiplication the magnitude information is included
in the output frequency variation (k.FMAX). However, in this
mode the zero power frequency is 0 Hz, so the output frequency
variation is from 0 Hz to (k.FMAX) Hz. Also note that a no-load
threshold and the reverse polarity indicator are implemented in
these modes see No Load Threshold and Reverse Polarity
Indicator sections. These modes are the most suitable for a
Class 1 meter implementation.
Channel Monitor Modes (Modes 3 and 7)
In this mode of operation the FOUT pulse frequency does not
give product information. When FS = 0, the FOUT output fre-
quency gives sign and magnitude information about the volt-
age on Channel 1. When FS = 1 the FOUT output frequency
gives sign and magnitude information about the voltage on
Channel 2.
Note the F1, F2 pulse outputs still continue to give power
information.
Table I. Operating Mode


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