LC7219M View Datasheet(PDF) - SANYO -> Panasonic
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LC7219M Datasheet PDF : 12 Pages
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LC7219, 7219M
Application Notes
The recommended crystal oscillator for the LC7219 and
LC7219M is the Nihon Dempa Kogyo Co., Ltd. (NDK)
LN-X-0702 (NR-18 type) or the LN-P-0001 (AT-51
type). The oscillator is connected as shown in figure 13.
Figure 13. Crystal oscillator connection
The device parameters for crystal oscillator frequencies
3.6MHz and 7.2MHz are shown in table 8.
Table 8. Device parameters vs. crystal frequency
Paraeter
Crystal frequency
7.2MHz
3.6MHz
Timebase clock
8Hz
4Hz
System clock
400kHz
200kHz
Frequency
measurement
interval
Period
measurement
check signal
Reference
frequencies
Data input/output
timing
30/60ms
60/120ms
900kHz
450kHz
1kHz, 5kHz, 9kHz,
10kHz, 25kHz, 50kHz,
100kHz,
t1 1.5µs, t3 1.5µs
0.5kHz, 2.5kHz, 4.5kHz,
5kHz, 12.5kHz, 25kHz,
50kHz,
t1 3µs, t2 3µs
Typical Application
Figure 14 shows a TV/AM/FM system using the IF counting system for electronic tuning.
Figure 14. TV/AM/FM system
The FMIN, AMIN, HCTR, and LCTR inputs should be capacitively coupled using a capacitor in the range 50 to
100pF. These coupling capacitors should be as close as possible to their respective inputs to minimize the effects of
stray capacitance.
The IF signals measurement should be done afte the IF-IC SD (station detect) signal are activated.
The circuit characteristics for each mode, TV, FM and AM, are shown in table 9.
Table 9. Circuit characteristics
Mode
DV
SP
Tuning
frequency steps
TV
1
×
50kHz
FM
1
×
AM
0
0
100kHz
10kHz
Note
× = don’t care
RF frequency
637.75MHz
(UHF)
90MHz
1,000kHz
IF frequency
10.7MHz
10.7MHz
450kHz
VCO frequency
648.45MHz
100.7MHz
1,450kHz
PLL reference
frequency
3.125kHz
50kHz
10kHz
Programmable
divider ratio
12,969
1,007
145
No.3661–11/12
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