Programming Information
53
Programming
Example
For the programming example given, the step values can be determined by look-
ing back at
Section 3.3
Programming Interview on page 23
.
1.
First, recover the values from the previous sections:
f
L
= 10000
f
D
= 1500
2.
From the tables shown below, pick the step value and apply it to the register
bits for the low pass step select and data filter select in
Section 3.5.14
Register
30h (61h), Data Filter Tuning on page 48
and
Section 3.5.15
Register 31h (63h),
Input Low Pass Filter on page 50
. The step values are determined as follows:
Table 3.5.19: Low Pass Filter Step Ranges
Table 3.5.20: Data Filter Step Ranges
f
L
Step = 011b
f
D
Step = 111b
3.
Based on the modulator format given in the example, select the QPSK data
input format:
Mod Format = QPSK
Mod QPSK Input = Separate
Therefore, the QPSK Data Input bit is set to “0”
4.
Combining all inputs, the following should be written to register 3Ch:
Register 3Ch = 00110111b = 37h
Range of f
L
Step
225KHz
≤
f
L
< 8MHz
000b
20KHZ
≤
f
L
< 225KHz
001b
2KHz
≤
f
L
< 20KHz
011b
150Hz
≤
f
L
< 2KHz
111b
Range of f
D
Step
225KHz
≤
f
D
< 8MHz
000b
20KHZ
≤
f
D
< 225KHz
001b
2KHz
≤
f
D
< 20KHz
011b
150Hz
≤
f
D
< 2KHz
111b
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