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ATR4258
4.8
FM 1 st IF Amplifier
A programmable gain amplifier is used in FM (and WB) mode between pin 38 and pin 30 to com-
pensate 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 Ω and fits to external ceramic filters.
Two different temperature coefficients of the FM IF amplifier can be selected by bit 66.
Table 4-9.
Gain of the FM IF Amplifier
Gain FM IF
19 dB
21 dB
23 dB
25 dB
27 dB
28 dB
29 dB
30 dB
Bit 91
0
0
0
0
1
1
1
1
Bit 90
0
0
1
1
0
0
1
1
Bit 89
0
1
0
1
0
1
0
1
Table 4-10.
Temperature Coefficient Setting of FM IF Amplifier
Temperature Coefficient (TC) of the IF Amplifier
TK min (TK 1)
TK max (TK 2)
Bit 66
0
1
4.9
4.10
AM 1 st IF Amplifier
In AM and WB mode, the gain of the 1 st IF amplifier is controlled by the IF-AGC to extend the
control range of the IF-AGC.
2 nd Mixer
The 2 nd mixer is used in AM, FM and WB mode. The mixer input has 330 Ω input resistance 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 band-
width 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.
Table 4-11.
2 nd Mixer Output Resistance in FM Mode
Bit 61
0
0
1
1
Bit 60
0
1
0
1
Output Resistance (Bit 54 = 0)
3.3 k Ω
0.63 k Ω
0.47 k Ω
0.29 k Ω
Output Resistance (Bit 54 = 1)
~100 k Ω
0.78 k Ω
0.55 k Ω
0.32 k Ω
The LO frequency of the 2 nd mixer (10.25 MHz) has to be applied at pin 22. This signal is usually
generated by the PLL circuit U4256BM.
9
4838B–AUDR–05/05
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