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參數資料
| 型號： | T4258NFNG3 |
| 廠商： | ATMEL CORP |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO44 |
| 封裝： | SSOP-44 |
| 文件頁數： | 38/38頁 |
| 文件大?。?/td> | 443K |
| 代理商： | T4258NFNG3 |
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9
T4258N
4566B–AUDR–02/04
FM 1st IF Amplifier
A programmable gain amplifier is used in FM (and WB) mode between pin 38 and
pin 30 to compensate the loss in the external ceramic band filters. The gain of this
amplifier is adjusted by bit 89 to bit 91. The input and the output resistance is 330
and
fits to external ceramic filters.
Two different temperature coefficients of the FM IF amplifier can be selected by bit 66.
AM 1st IF Amplifier
In AM and WB mode, the gain of the 1st IF amplifier is controlled by the IF-AGC to
extend the control range of the IF-AGC.
2nd Mixer
The 2nd mixer is used in AM, FM and WB mode. The mixer input has 330
input resis-
tance and can be connected directly to an external ceramic filter.
In FM mode, the high output resistance of the second mixer is reduced to increase the
bandwidth of the tank at the mixer output. The output resistance can be selected by
bit 60 and bit 61.
In AM and WB mode bit 61 and bit 62 should be set to 0.
The LO frequency of the 2nd mixer (10.25 MHz) has to be applied at pin 22. This signal
is usually generated by the PLL circuit U4256BM.
Table 9. Gain of the FM IF Amplifier
Gain FM IF
Bit 91
Bit 90
Bit 89
19 dB
0
21 dB
0
1
23 dB
0
1
0
25 dB
0
1
27 dB
1
0
28 dB
1
0
1
29 dB
1
0
30 dB
1
Table 10. Temperature Coefficient Setting of FM IF Amplifier
Temperature Coefficient (TC) of the IF Amplifier
Bit 66
TK
min (TK 1)
0
TK
max (TK 2)
1
Table 11. 2nd Mixer Output Resistance in FM Mode
Bit 61
Bit 60
Output Resistance (Bit 54 = 0)
Output Resistance (Bit 54 = 1)
00
3.3 k
~ 100 k
0
1
0.63 k
0.78 k
1
0
0.47 k
0.55 k
1
0.29 k
0.32 k
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