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参数资料
| 型号： | T4260ILS |
| 厂商： | ATMEL CORP |
| 元件分类： | 调谐器 |
| 英文描述： | AUDIO TUNER, PDSO44 |
| 封装： | SSO-44 |
| 文件页数： | 10/30页 |
| 文件大小： | 299K |
| 代理商： | T4260ILS |
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18
T4260
4528I–AUDR–08/04
FM Mixer
In the FM mixer stage, the FM reception frequency is down-converted to the IF
frequency. The VCO frequency is used as LO frequency for the mixer.
PLL Loop Filter
The PLL loop filter selection for AM and FM mode can be controlled by bit 145 as given
in Table 19.
Fractional Mode
The activated fractional mode (bit 144 = 0) in connection with the direct shift (bit 32 = 0)
allows fast frequency changes (with the help of the 2-bit shift) with a four times higher
step frequency. After the frequency change, the normal step frequency is active again.
If the fractional mode is deactivated (bit 144 = 1) and direct shift mode is active,
(bit 32 = 0) the VCO frequency is set to the next lower frequency which is many times
the amount frequency of 4 times step frequency. This means that the 2 shifted bits of the
active N-Divider are not used in this mode. The shift bits are interpreted as logic 0.
The fractional mode with direct shift mode deactivated (bit 32 = 1) allows normal fre-
quency changes with a step frequency of 12.5 kHz.
Table 18. Divider Factor of the AM Prescaler
Divider AM Prescaler
B143
B142
B141
B140
Divide by 2
0
Divide by 3
0
1
Divide by 4
0
1
0
Divide by 5
0
1
Divide by 6
0
1
0
Divide by 7
0
1
0
1
Divide by 8
0
1
0
Divide by 9
0
1
Divide by 10
1
x
Table 19. Loop Filter Operating Mode
PDAM/PDFM
B145
PDFM active
0
PDAM active
1
Table 20. Fractional Mode
Fractional
B144
ON
0
OFF
1
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