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参数资料
| 型号： | HSP50210JI-52Z |
| 厂商： | Intersil |
| 文件页数： | 9/51页 |
| 文件大小： | 0K |
| 描述： | IC DEMODULATOR COSTAS 84-PLCC |
| 标准包装： | 15 |
| 功能： | 解调器 |
| 频率： | 52MHz |
| RF 型： | AM，FM |
| 封装/外壳： | 84-LCC（J 形引线） |
| 包装： | 管件 |
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HSP50210
TABLE 1. ROOT RAISED COSINE COEFFICIENTS
0
-20
-40
-60
-80
-100
COEFFICIENT INDEX
0
1
2
3
4
5
COEFFICIENT
2
-2
1
8
-16
-14
0
f CLK
2f CLK
3f CLK
4f CLK
f CLK
6
86
0
10 10 10 10
FREQUENCY (NORMALIZED TO INPUT SAMPLE RATE)
FIGURE 4. RRC FILTER IN HSP50210
2
7
8
9
10
11
12
160
86
-14
-16
8
1
-0.18
13
-2
-0.36
14
2
-0.54
-0.72
SHOWN BELOW
ENLARGED FOR CLARITY
The I and D filter consists of an accumulator, a
programmable shifter and a two sample summer, as shown
in Figure 3. The programmable shifter is provided to
compensate for the gain introduced by the accumulator (see
Table 15). The accumulator provides Integrate and Dump
-0.90
0
f CLK
25
2f CLK
25
3f CLK
25
4f CLK
25
f CLK
5
Filtering for decimation factors up to 16. The two sample
summer provides the moving average required for an
additional decimation factor of 2. A decimation factor of 1
0
-0.07
-0.14
-0.21
-0.28
(bypass), 2, 4, 8, 16, or 32 may be selected. At the maximum
decimation rate, a baseband signal sampled at 32x the
symbol rate can be filtered.
The output of the two sample summer is demultiplexed into
two sample streams at the symbol rate. The demultiplexed
data streams from the I and Q processing paths are fed to
the Symbol Tracking Block and Soft decision slicer. The
multiplexed data streams on I and Q are provided as one of
the selectable inputs for the Cartesian-to-Polar Converter.
-0.35
0
f CLK
40
f CLK
20
3f CLK
40
f CLK
10
5f CLK
40
3f CLK
20
Cartesian/Polar Converter
The Cartesian/Polar Converter maps samples on the I and Q
FREQUENCY (NORMALIZED TO INPUT SAMPLE RATE)
FIGURE 5. PASSBAND RIPPLE OF RRC FILTER IN HSP50210
processing paths to their equivalent phase/magnitude
representation. The magnitude conversion is equivalent to
Equation 5:
Mag (I, Q) = ( 0.81 )? ( I + Q )
2 2
(EQ. 5)
where 0.81 is the gain of the conversion process. The
magnitude output is an 8-bit unsigned value ranging from 0.0
to 1.9922.
9
FN3652.5
July 2, 2008
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