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參數(shù)資料
| 型號(hào)： | T4258NFN |
| 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(shù)： | 37/38頁 |
| 文件大?。?/td> | 443K |
| 代理商： | T4258NFN |
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8
T4258N
4566B–AUDR–02/04
AM RF-AGC
The AM RF-AGC controls the current into the AM pin diodes (pin 7) and the source drain
voltage of the MOSFET in the AM preamplifier stage (pin 6) to limit the level at the AM
mixer input (pin 3, pin 41). This threshold level can be set by bit 64 and bit 65. If the
level at the AM mixer input exceeds the selected threshold, the current into the AM pin
diodes is increased. If this step is not sufficient, the source drain voltage of the MOSFET
is decreased. The time constant of the AGC control loop can be adjusted by changing
the value of the capacitor at pin 8.
FM 1st Mixer
In the 1st FM mixer stage, the FM reception frequency is down converted to the 1st IF
frequency. The VCO frequency is used as LO frequency for the mixer.
AM 1st Mixer
The AM 1
st mixer is used for up-conversion of the AM reception frequency to the 1st IF
frequency. Therefore, an AM prescaler is implemented to generate the necessary LO
frequency from the VCO frequency. The divide factor of the AM prescaler can be
selected according to Table 8. (The AM prescaler is only active in AM mode).
Table 7. AM-AGC Threshold
AM-AGC Threshold
Bit 65
Bit 64
91 dBV
0
94 dBV
0
1
97 dBV
1
0
100 dBV
1
Table 8. Divide Factor of the AM Prescaler
Divider (AM Prescaler)
Bit 93
Bit 92
Bit 84
Bit 83
Bit 82
Bit 81
Divide by 2
100000
Divide by 3
100001
Divide by 4
100010
Divide by 5
100011
Divide by 6
100100
Divide by 7
100101
Divide by 8
100110
Divide by 9
100111
Divide by 10
101
X
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