參數(shù)資料
型號(hào)： T4260ILS
廠(chǎng)商： ATMEL CORP
元件分類(lèi)： 調(diào)諧器
英文描述： AUDIO TUNER, PDSO44
封裝： SSO-44
文件頁(yè)數(shù)： 7/30頁(yè)
文件大小： 299K
代理商： T4260ILS
15
T4260
4528I–AUDR–08/04
Reception Mode
There are two different operation modes, AM and FM, which are selected by means of
bit 17 and bit 145 according to Table 1 on page 11 and Table 2 on page 13. In AM mode
(bit 17 = 1), the AM mixer, the AM RF-AGC, the AM divider (prescaler) and the IF AM
amplifier (input at pin 35) are activated. In FM mode (bit 17 = 0), the FM mixer, the FM
RF-AGC and the IF FM amplifier (input at pin 36) are activated.
In AM or FM reception mode, bit 145 has to be set to the corresponding mode. The
buffer amplifier input can be connected to pin 16 (with the external FM loop filter) by
bit 145 = 0 and to pin 17 (with the external AM loopfilter) by bit 145 = 1.
The AM/FM function for the tuner part is controlled by bit 17 as given in Table 10.
PLL
The PLL can switch off by bit 4 = 0. In this case, the N-Divider input signal is internally
connected to ground.
HCDEL
There are two registers, HCDEL 1 (bits 20 and 21) and HCDEL 2 (bits 22 and 23), to
control the delay time of the high-current charge pump and to deactivate them. bit 18
(HCDEL) determines whether register HCDEL 1 or 2 is used.
Table 9. RF-AGC
RF-AGC AM
RF-AGC FM
B15
B14
B13
B12
88 dB
91 dB
0
89 dB
92 dB
0
1
90 dB
93 dB
0
1
0
91 dB
94 dB
0
1
92 dB
95 dB
0
1
0
...
102 dB
105 dB
1
0
103 dB
106 dB
1
Table 10. Tuner Operating Modes
AM/FM
B17
FM
0
AM
1
Table 11. PLL Mode
PLL ON/OFF
B4
PLL OFF
0
PLL ON
1
Table 12. High-current Charge Pump Delay Time Register
HCDEL 1/2 Select Mode
HCDEL (B18)
HCDEL 1
0
HCDEL 2
1
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