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STV0042A 数据表(PDF) 20 Page - STMicroelectronics

部件名 STV0042A
功能描述  SATELLITE SOUND AND VIDEO PROCESSORS
PDF  24 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STV0042A 数据表(HTML) 20 Page - STMicroelectronics

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Register 5 : FM Deviation Selection
432
1
0
Selected Nominal Carrier Modulation
Bit 5 = 0
Bit 5 = 1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Do not use
Do not use
Do not use
Cal. set. (2V)
592kHz
534kHz
484kHz
436kHz
396kHz
358kHz
322kHz
292kHz
266kHz
240kHz
218kHz
196kHz
179kHz
161kHz
146kHz
122kHz
120kHz
109kHz
98kHz
89kHz
78kHz
71kHz
65kHz
58kHz
53kHz
48.6kHz
43.8kHz
39.6kHz
cal : do not use = 0.3373V offset on VCO
cal : do not use = 0.3053V offset on VCO
cal : do not use = 0.2763V offset on VCO
calibration setting (1V offset on VCO)
296kHz modulation
267kHz modulation
242kHz
218kHz
198kHz
179kHz
161kHz
146kHz
133kHz
120kHz
109kHz
98.3kHz
89.7kHz
80.9kHz
73.1kHz
66.0kHz
60.0kHz
54.4kHz = default power up state
49.1kHz
44.3kHz
39.8kHz
35.9kHz
32.4kHz
29.1kHz
26.7kHz
24.3kHz
21.9kHz
19.7kHz
Example : Default power up state 54.4kHz
⇒±54.4kHz.
Register 1
Bit <7>
Register 3
Bit <3>
Video Deemphasis/22kHz
0
0
1
1
0
1
0
1
Deemphasis 1 (default)
Deemphasis 1 + 22kHz (Pin 13)
Deemphasis 2
Deemphasis 2
FM DEMODULATION SOFTWARE ROUTINE
CONTROL REGISTERS (continued)
With the STV0042A circuit, for each channel, three
steps are required to acheive a FM demodulation :
-1
st step :To set the demodulationparameters :
• FM deviation selection,
• Subcarrier frequency selection.
-2
nd step : To implement a waiting loop to check
the actual VCO frequency.
-3
rd step :To close the demodulationphase locked
loop (PLL).
Refering to the FM demodulation block diagram
(page 12), the frequency synthesis block is com-
mon to both channels (left and right) ; consequently
two completesequenceshave to be done one after
the other when demodulating stereo pairs.
Detailed Description
Conventions :
- R = Stands for Register
- B = Stands for Bit
Example : R05 B2 = Register 05, Bit 2
For clarity, the explanations are based on the fol-
l ow ing example : st ereo pai r 7.02MHz /L
7.20MHz/R, deviation
±50kHz max.
STV0042A
20/24



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