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ATR4255-ILSH Datasheet(PDF) 7 Page - ATMEL Corporation

Part # ATR4255-ILSH
Description  AM/FM RECEIVER IC
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATR4255-ILSH Datasheet(HTML) 7 Page - ATMEL Corporation

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ATR4255
4837A–AUDR–10/04
AM 1st IF Amplifier
In AM mode, the gain of the 1st IF amplifier is controlled by the IF-AGC to extend the
control range of the IF-AGC.
2nd Mixer
The 2nd mixer is used in AM, FM and WB mode. The mixer input has 330
Ω input resis-
tance 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
bandwidth of the tank at the mixer output. The output resistance can be selected by
bit 60 and bit 61.
The LO frequency of the 2nd mixer (10.25 MHz) has to be applied at pin 22. This signal
is usually generated by the PLL circuit U4256BM.
Table 6. Gain of the FM IF Amplifier
Gain FM IF
Bit 91
Bit 90
Bit 89
20 dB
0
0
0
22 dB
0
0
1
24 dB
0
1
0
26 dB
0
1
1
28 dB
1
0
0
29 dB
1
0
1
30 dB
1
1
0
31 dB
1
1
1
Table 7. Temperature Coefficient Setting of FM IF Amplifier
Temperature Coefficient (TC) of the IF Amplifier
Bit 66
TK
min
0
TK
max
1
Table 8. 2nd Mixer Output Resistance in FM Mode
Bit 61
Bit 60
Output Resistance (Bit 54 = 0)
Output Resistance (Bit 54 = 1)
00
3.3 k
Ω
~100 k
Ω
0
1
0.63 k
Ω
0.78 k
Ω
1
0
0.47 k
Ω
0.55 k
Ω
1
1
0.29 k
Ω
0.32 k
Ω
Table 9. FM Bandwidth Mixer 2
Bit 61
Bit 60
FM BW Mixer 2
0
0
150 kHz
0
1
200 kHz
1
0
250 kHz
1
1
450 kHz
Note:
The bandwidth is also depending from the values of the application circuit.


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