參數(shù)資料
型號(hào)： T4258NFN
廠商： ATMEL CORP
元件分類(lèi)： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO44
封裝： SSOP-44
文件頁(yè)數(shù)： 36/38頁(yè)
文件大?。?/td> 443K
代理商： T4258NFN
7
T4258N
4566B–AUDR–02/04
Note:
The U4256 FMOSCIN (pin 19) input frequency is limited to 160 MHz.
FM RF-AGC
The FM RF-AGC circuit includes a wide-band level detector at the input pin 1 of the FM
mixer and an in-band level detector at the output of the FM IF amplifier (pin 30). The out-
puts of these level detectors are used to control the current into the pin diode (see
Figure 3) in order to limit the signal level at the FM mixer input and the following stages.
The maximum pin diode current is determined by R115 and the time constant of the
AGC control loop can be adjusted by changing the value of C111.
The AGC threshold level at the input of the FM mixer can be adjusted by bit 64 and
bit 65 according to Table 6. The in-band AGC threshold refers to the FM mixer input
(pin 1, pin 2) depends on the gain of the FM IF amplifier and can be adjusted by bit 89
to bit 91.
Figure 3. FM RF-AGC Bit 92
Table 5. Local Oscillator Prescaler (VCO/Buffer Divider)
Prescaler VCO
Prescaler Buffer
Bit 12
Bit 11
Bit 10
11
X
0
1.5
3
001
1.5
101
22
X
1
0
33
X
1
Table 6. FM-AGC Threshold
FM-AGC Threshold
Bit 65
Bit 64
100 dBV
0
97 dBV
0
1
94 dBV
1
0
91 dBV
1
AGC
B92
PIN Diode
VS
Pin 42
Pin 5
C111
R115
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