STA323W datasheet(50/71 Pages) STMICROELECTRONICS

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STA323W

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When DDX® is used with an AM radio tuner, it is recommended to use the AMAM bits to

automatically adjust the output PWM switching rate so that it depends on the specific radio

frequency that the tuner is receiving. The values used in AMAM are also dependent upon

the sample rate that is determined by the ADC used.

100

1.301 MHz – 1.480 MHz

1.181 MHz – 1.340 MHz

101

1.481 MHz – 1.600 MHz

1.341 MHz – 1.500 MHz

110

1.601 MHz – 1.700 MHz

1.501 MHz – 1.700 MHz

Table 57.

Automode crossover setting

Bit

R/W

RST

Name

Description

7…4 R/W

XO (3…0)

000: user defined crossover coefficients are used

Otherwise: preset coefficients are used for the required

crossover setting

Table 58.

Crossover frequency selection

XO (2..0)

Bass management - crossover frequency

0000

User

0001

80 Hz

0010

100 Hz

0011

120 Hz

0100

140 Hz

0101

160 Hz

0110

180 Hz

0111

200 Hz

1000

220 Hz

1001

240 Hz

1010

260 Hz

1011

280 Hz

1100

300 Hz

1101

320 Hz

1110

340 Hz

1111

360 Hz

Table 56.

Auto mode AM switching frequency selection (continued)

AMAM (2..0)

48 kHz/96 kHz input Fs

44.1 kHz/88.2 kHz input Fs

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