參數(shù)資料
型號(hào)： CE5038
廠商： Intel Corp.
英文描述： DVB-S2 Advanced Modulation Satellite Tuner
中文描述： DVB - S2的先進(jìn)調(diào)制衛(wèi)星調(diào)諧器
文件頁(yè)數(shù)： 31/41頁(yè)
文件大小： 463K
代理商： CE5038
CE5038
Data Sheet
30
Intel Corporation
3.4.19 LO Window Relaxation (WRE Bit)
In the event of the controller failing to lock due to the lock window being too narrow, the window is automatically
widened when
WRE
(byte-11 bit-0) is ‘1’ in order to achieve lock. The
WRE
bit, when set to logic ‘0’, disables this
facility.
3.4.20 LO Test (TL Bit)
For test purposes, the LO clock divided by the prescaler ratio can be output on the LOTEST pin by setting bit
TL
(byte-13 bit-0) to a logic ‘1’. By default this output is off, i.e., the
TL
bit is at logic ‘0’.
4.0 Software
In normal operation, only initialization, channel (frequency) changes and symbol rates require programming
intervention. Note that the PLL comparison frequency is set by the crystal frequency divided by the PLL reference
divide ratio. In the following examples of register settings, binary values are frequently used, indicated as e.g.,
0110
2
.
4.1 Power-On Software Initialization
a.
Bytes 2 + 3:
2
14
- 2
0
= desired channel frequency/PLL comparison frequency (VCO = 3, sub-band = 0,
divider = 4 is default, means that the local oscillator frequency will be about 1.1 GHz).
b.
Byte 4:
BA1:0 = 01
2
for initial baseband filter input level.
c.
Byte 4:
BG1:0 = 01
2
for target baseband filter output level.
d.
Byte 4:
LEN = 1 if the RF loop through is to be disabled.
e.
Byte 5:
R4:0 = PLL reference divider for desired comparison frequency.
f.
Byte 8:
PS = 0 to give a pre-scaler ratio of 16/17. Bits ‘0’ & ‘1’ should be set to 00
2
.
g.
Byte 11:
WL2:0 and WH2:0 may require different values from the defaults. Recommended settings are:
Table 18 - LO Recommended Window Levels
h.
Byte 13:
BR4:0 = Crystal frequency in use (see also 4.3.3.1 on page 31).
4.2 Changing Channel
Bytes 2 + 3:
2
14
- 2
0
= Channel frequency/PLL comparison frequency.
4.3 Symbol Rate and Filter Calculations
4.3.1 Determining the Filter Bandwidth from the Symbol Rate
f
bw
= (
α
* symbol rate)/(2.0 * 0.8) +
f
offs
where:
α
= 1.35 for DVB or 1.20 for DSS, and is the roll-off of the raised-root cosine filter in the transmitter,
f
offs
is the total offset of the received signal due to all causes (LNB drift, synthesizer step size, etc) and is read back
from the demodulator,
WS
WH2
WH1
WH0
WL2
WL1
WL0
WRE
Lower V
Upper V
Lock
0
1
1
0
1
0
1
1
3.49
3.89
Unlock
1
1
1
1
1
0
0
1
2.95
4.89
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