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CDB5466U
1.2.2.4
Selecting Frequency of E1 and E2
The pulse rate on E1 and E2 can be set to one of four frequency ranges. Input pins FREQ1 and FREQ0 determine
the maximum frequency on E1 and E2 for sine wave inputs with zero phase shift. The frequency of E2 is equal to
the frequency of E1 with active-low alternating pulses. Table 6 illustrates the options available.
The maximum frequency on the E1 and E2 output pins is determined by the position of the jumpers on J28, J29 and
J30, if the maximum peak differential signal applied to both channels is a sine wave with zero phase shift.
Maximum Frequency for a Sine Wave
Frequency Select
FREQ2
FREQ1
FREQ0
E1 or E2
E1+E2
FOUT
J28
J29
J30
0.125 Hz
0.25 Hz
64x(E1+E2)
16 Hz
VD+
FREQ2
O
O
VD+
FREQ1
O
O
VD+
FREQ0
O
O
GND
GND
GND
0.25 Hz
0.5 Hz
32x(E1+E2)
16 Hz
VD+
FREQ2
O
O
VD+
FREQ1
O
O
VD+
FREQ0
O
O
GND
GND
GND
0.5Hz
1.0 Hz
16x(E1+E2)
16 Hz
VD+
FREQ2
O
O
VD+
FREQ1
O
O
VD+
FREQ0
O
O
GND
GND
GND
1.0 Hz
2.0 Hz
2048x(E1+E2)
4,096 Hz
VD+ O
FREQ2 O
VD+ O
FREQ1 O
VD+ O
FREQ0 O
GND
(Default)
GND
(Default)
GND
(Default)
0.125 Hz
0.25 Hz
128x(E1+E2)
32 Hz
VD+
FREQ2
O
O
VD+
FREQ1
O
O
VD+
FREQ0
O
O
GND
GND
GND
0.25 Hz
0.5 Hz
64x(E1+E2)
32 Hz
VD+
FREQ2
O
O
VD+
FREQ1
O
O
VD+
FREQ0
O
O
GND
GND
GND
0.5 Hz
1.0 Hz
32x(E1+E2)
32 Hz
VD+
FREQ2
O
O
VD+
FREQ1
O
O
VD+
FREQ0
O
O
GND
GND
GND
1.0 Hz
2.0 Hz
16x(E1+E2)
32 Hz
VD+
FREQ2
O
O
VD+
FREQ1
O
O
VD+
FREQ0
O
O
DS676DB1
GND
Table 6. Energy Output Frequency
GND
GND
7
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