ATR4258 Datasheet, PDF (31/38 Pages) ATMEL Corporation – AM/FM RECEIVER IC

Diagrams
ATR4258
The following data was measured with the application board (see Figure 20).
In the measurement setup, a 50 Ω generator is terminated by 50 Ω and connected to the
antenna input by a 50 Ω series resistor to achieve 75 Ω termination at the antenna input.
The generator level specified is the output voltage of this 50 Ω generator at 50 Ω load. If
the application board is replaced by a 75 Ω resistor, the voltage at this resistor is 6 dB
below the specified voltage level of the 50 Ω generator.
Figure 12. FM Demodulator
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
1
0.9
0.8
0.7
+85°C
0.6
MPX
-40°C
0.5
-40°C
0.4
THD
0.3
0.2
+85°C
0.1
10 20 30 40
50 60
70 80
0
90 100
Frequency Deviation [kHz]
Note: Integrated band-filter BW setting: 120 kHz (bits 0 to 2 = 0, bit 3 = 1);
1 kHz modulation frequency; 50 µs de-emphasis (THD)
Figure 13. Multipath Sensor
5
4
+85°C
3
-40°C
2
1
0
0
10 20 30 40
50 60
70 80 90 100
AM Modulation Depth [%]
Note: AM modulation frequency 20 kHz; generator level 40 dBµV
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4838A–AUDR–10/04