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4.5
Function of DAC1, DAC2 in FM and AM Mode (Pin 3 and Pin 4)
For automatic tuner alignment, the DAC1 and DAC2 of the ATR4256 can be controlled by set-
ting the gain of VPDO and offset values. Figure 4-4 shows the principle of the operation. In FM
Mode the gain is in the range of 0.69 × V (PDO) to 2.16 × V (PDO) . The offset range is +0.56V to
–0.59V. For alignment, DAC1 and DAC2 are connected to the varicaps of the preselection fil-
ters. For alignment, offset and gain are set to have the best tuner tracking.
Figure 4-4.
Principal Operation for Alignment
Bit 34
PDO (FM)
Gain
+/-
DAC1,2
Vref (AM)
(3V)
Offset
The DAC mode can be controlled by setting Bit 34 as follows
Table 4-3.
DAC Mode
DAC Mode
FM
AM
B34
0
1
If Bit 34 = 1 (AM Mode), then DAC1 and DAC2 can be used as standard DAC converters. The
internal voltage of 3V is connected to the gain and offset input of DAC1 and DAC2 (only in AM
Mode). The gain is in the range of 0.46 × 3V to 3.03 × 3V. The offset range is +1.46V to –1.49V.
Figure 4-5.
Internal Components at DAC1 and DAC2 Output
VS
DAC1,2
6
ATR4256
4867D–AUDR–01/08
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