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Table 4-12.
FM Bandwidth Mixer 2
Bit 61
0
0
1
1
Bit 60
0
1
0
1
FM Bandwidth Mixer 2
150 kHz
200 kHz
250 kHz
450 kHz
Note:
The bandwidth is also dependant on the values of the application circuit.
4.11
2 nd IF Amplifier
In AM and WB mode, the input of the second IF amplifier is pin 28, is externally connected to the
2 nd 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 connected to the 2 nd mixer output
(pin 23, pin 24) and the integrated FM band filter is used for channel selectivity only. It is possi-
ble to use an additional external filter between the 2 nd mixer tank and pin 28 in FM mode by
setting bit 54 to 1.
Table 4-13.
2 nd IF Filter in FM Mode
2nd IF Filter
Internal filter
External and internal filter
Bit 54
0
1
4.12
IF-AGC
The IF-AGC controls the level of the 2 nd IF signal that is passed to the AM demodulator input or
the integrated FM band filter and to the 2 nd 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.
Table 4-14.
IF-AGC Time Constant
Mode
FM/WB
AM reception
AM search
Bit 92
1
0
0
Bit 88
X
0
1
IF AGC Time Constant
IFAGCL (fast)
IFAGCH (slow)
IFAGCL (fast)
In FM/WB mode, the output signal of the FM demodulator is applied to pin 35 via a series resis-
tor of about 95 k Ω . This low-pass filtered output signal of the FM demodulator is used for the FM
demodulator fine adjustment, for muting and as a reference for the deviation sensor.
10
ATR4258
4838B–AUDR–05/05
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