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參數(shù)資料
| 型號(hào)： | TA2159F |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 0.50 MM PITCH, PLASTIC, QFP-64 |
| 文件頁(yè)數(shù)： | 5/28頁(yè) |
| 文件大?。?/td> | 370K |
| 代理商： | TA2159F |
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TA2159F
2002-10-03
13
4.
How to control the Divider of FM OSC.
Divider of FM OSC ON/OFF switching is controlled by external pull-up resistor of pin 52.
In case of Divider of FM OSC is used, it is necessary to set up the value of R under 470 W (typ.).
When R is over 470 W, it is feared that Divider is not operating. (At this time, buffer output frequency is
equal to FM OSC frequency.)
Mode
SW8
Output Frequency
Output Level (typ.)
OPEN
1/1 FM OSC
35 mVrms
FM
ON
1/16 FM OSC
110 mVrms
Note 1: The 1/16 FM OSC is used to set the combination of the tuner and PLL.
When combining the tuner and PLL
using the IC, do not select the 1/1 FM OSC.
5.
IF Count Flow
SW8
FM
OSC
buff
1/1
or
1/16
52
470
W
buff out
RF VCC
W0 & W1
= 0
Narrow mode?
Seek stop
Narrow mode set
IF check
IF count check
Gate time 4 ms
Wide mode set
Yes
No
Yes
No
Next PLL set
100 ms wait
IF count check
Gate time 64 ms
W0 & W1
= 0
IF
> = 10.7 MHz - 80 kHz
IF
> = 10.7 MHz - 20 kHz
No
IF
< = 10.7 MHz + 80 kHz
IF
< = 10.7 MHz + 20 kHz
Yes
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