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
E1 or E2
0.125 Hz
E1+E2
0.25 Hz
FOUT
64x(E1+E2)
16 Hz
J28
VD+
FREQ2
GND
Frequency Select
FREQ2
FREQ1
J29
VD+
FREQ1
GND
FREQ0
J30
VD+
FREQ0
GND
O
O
O
O
O
O
0.25 Hz
0.5 Hz
32x(E1+E2)
16 Hz
VD+
FREQ2
GND
O
O
VD+
FREQ1
GND
O
O
VD+
FREQ0
GND
O
O
0.5Hz
1.0 Hz
16x(E1+E2)
16 Hz
VD+
FREQ2
GND
O
O
VD+
FREQ1
GND
O
O
VD+
FREQ0
GND
O
O
1.0 Hz
2.0 Hz
2048x(E1+E2)
4,096 Hz
VD+
O
FREQ2
O
GND
(Default)
VD+
O
FREQ1
O
GND
(Default)
VD+
O
FREQ0
O
GND
(Default)
0.125 Hz
0.25 Hz
128x(E1+E2)
32 Hz
VD+
FREQ2
GND
O
O
VD+
FREQ1
GND
O
O
VD+
FREQ0
GND
O
O
0.25 Hz
0.5 Hz
64x(E1+E2)
32 Hz
VD+
FREQ2
GND
O
O
VD+
FREQ1
GND
O
O
VD+
FREQ0
GND
O
O
0.5 Hz
1.0 Hz
32x(E1+E2)
32 Hz
VD+
FREQ2
GND
O
O
VD+
FREQ1
GND
O
O
VD+
FREQ0
GND
O
O
1.0 Hz
2.0 Hz
16x(E1+E2)
32 Hz
VD+
FREQ2
GND
O
O
VD+
FREQ1
GND
O
O
VD+
FREQ0
GND
O
O
Table 6. Energy Output Frequency
DS676DB1
7
CIRRUS [ CIRRUS LOGIC ]
