Справочник Пользователя для Nxp Semiconductors TFA9812

TFA9812_2

© NXP B.V. 2009. All rights reserved.

In I

2

C control mode the following sample frequency f

s

 can be used: 8 kHz, 11.025 kHz,

12 kHz, 16 kHz, 22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, 48 kHz, 64 kHz, 88.2 kHz, 96 kHz,
128 kHz, 176.4 kHz or 192 kHz. The I

2

C control for f

s

 selection can be found in

In Legacy control mode the following sample frequencies (f

s

) can be used: 32 kHz,

44.1 kHz or 48 kHz.

The BCK-to-WS and MCLK-to-WS frequency ratios are automatically detected, so no
control settings need to be configured for these.

In I

2

C control mode all the formats listed in

 are supported. The appropriate I

2

C

controls for selecting the supported formats can be found in

control mode only a subset of the supported formats can be used. These are shown in

 and the required pin control is given in

.

See

 for details of how to enable Legacy control mode.

The equalizer function can be bypassed and the equalizer can be configured to either a
5-band or 10-band function. These settings are for both audio channels simultaneously.

There are 20 bands in the equalizer. These are distributed as follows:

Bands A1 to A5 are bands 1 to 5 of output 1 (used in 5-band and 10-band
configuration).

Bands B1 to B5 are bands 1 to 5 of output 2 (used in 5-band and 10-band
configuration).

Bands C1 to C5 are bands 6 to 10 of output 1 (used in 10-band configuration only).

Bands D1 to D5 are bands 6 to 10 of output 2 (used in 10-band configuration only).

In I

2

C control mode each band can be configured separately using I

2

C register settings.

In Legacy control mode the equalizer is bypassed.

The shape of each parametric equalizer band is determined by the three filter parameters:

(Relative) center frequency

.

Quality factor Q.

Gain factor G.

0

I

2

S

1

MSB-justified

ω

π

⁄

(

)

=