參數(shù)資料
型號(hào)： T4260ILS
廠商： ATMEL CORP
元件分類： 調(diào)諧器
英文描述： AUDIO TUNER, PDSO44
封裝： SSO-44
文件頁(yè)數(shù)： 11/30頁(yè)
文件大?。?/td> 299K
代理商： T4260ILS
19
T4260
4528I–AUDR–08/04
Spurious Suppression
In fractional and direct shift mode the spurious suppression is able by SW wire and SW
impulse.
Charge Pump (AMLF/FMLF)
AMLF/FMLF is the current charge pump output of the PLL. The current can be con-
trolled by setting the bits 62 and 63. The loop filter has to be designed correspondingly
to the chosen pump current and the internal reference frequency.
During the frequency change, the high-current charge pump (bit 62) is active to enable
fast frequency changes. After the frequency change, the current will be reduced to guar-
antee a high S/N ratio. The low-current charge pump (bit 63) is then active. The high
current charge pump can also be switched off by setting the bits of the active HCDEL
register to 0 (bit 20 and bit 21 [HCDEL 1] or bit 22 and bit 23 [HCDEL 2]).
The current of the high-current charge pump is controlled by bit 62 as given in Table 23.
The current of the low-current charge pump is controlled by bit 63 as given in Table 24.
External Voltage at AMLF
(Oscillator)
The oscillator (pin 22) can be switched on/off by bit 65. It is possible to use the oscillator
buffer as an input or as an output. At the AMLF (pin 17), an external tuning voltage can
be applied (bit 65 = 0). If this is not done, the IC operates in standard mode (bit 65 = 1).
The oscillator, oscillator buffer and the AMLF are controlled by the bits 65 and 64 as
given in Table 25 on page 20.
Table 21. Spurious Suppression by SW Wire
SW Wire
B60
OFF
0
ON
1
Table 22. Spurious Suppression by Correction Current Charge Pump
SW Impulse
B61
OFF
0
ON
1
Table 23. High-current Charge Pump
High-current Charge Pump
B62
1 mA
0
2 mA
1
Table 24. Low-current Charge Pump
Low Current Charge Pump
B63
50 A
0
100 A
1
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