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參數資料
| 型號： | 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： | 2/38頁 |
| 文件大?。?/td> | 443K |
| 代理商： | T4258NFN |
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10
T4258N
4566B–AUDR–02/04
Note:
The bandwidth is also dependant on the values of the application circuit.
2nd IF Amplifier
In AM and WB mode, the input of the second IF amplifier is pin 28, is externally con-
nected to the 2nd mixer tank through the AM ceramic filter to achieve channel selectivity.
During normal FM operation (bit 54 = 0), the input of the second IF amplifier is con-
nected to the 2nd mixer output (pin 23, pin 24) and the integrated FM band filter is used
for channel selectivity only. It is possible to use an additional external filter between the
2nd mixer tank and pin 28 in FM mode by setting bit 54 to 1.
IF-AGC
The IF-AGC controls the level of the 2nd IF signal that is passed to the AM demodulator
input or the integrated FM band filter and to the 2nd IF output, pin 20.
Two different time constants of the IF-AGC can be selected by the capacitors at pin 35
(IFAGCH) and pin 36 (IFAGCL). The short time constant (IFAGCL) is used in FM/WB
mode and in AM search mode. The long time constant (IFAGCH) is used for AM
reception.
In FM/WB mode, the output signal of the FM demodulator is applied to pin 35 via a
series resistor of about 95 k
. This low-pass filtered output signal of the FM demodula-
tor is used for the FM demodulator fine adjustment, for muting and as a reference for the
deviation sensor.
Table 12. FM Bandwidth Mixer 2
Bit 61
Bit 60
FM Bandwidth Mixer 2
0
150 kHz
0
1
200 kHz
1
0
250 kHz
1
450 kHz
Table 13. 2nd IF Filter in FM Mode
2nd IF Filter
Bit 54
Internal filter
0
External and internal filter
1
Table 14. IF-AGC Time Constant
Mode
Bit 92
Bit 88
IF AGC Time Constant
FM/WB
1
X
IFAGCL (fast)
AM reception
0
IFAGCH (slow)
AM search
0
1
IFAGCL (fast)
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