STA323W datasheet(11/77 Pages) STMICROELECTRONICS

11 / 77 page

STA323W

Description

11/77

1.1

EQ processing

Two channels of input data (re-sampled if necessary) at 96 kHz are provided to the EQ

processing block. In these blocks, up to four user-defined Biquads can be applied to each of

the two channels.

Pre-scaling, DC-blocking high-pass, de-emphasis, bass, and tone control filters can also be

implemented by means of configuration parameter settings.

The entire EQ block can be bypassed for all channels simultaneously by setting the DSPB

bit to 1. The CxEQBP bits can also be used to bypass the EQ functionality on a per channel

basis. Figure 3 shows the internal signal flow through the EQ block.

Figure 3.

Channel signal flow diagram through the EQ block

1.2

Output options

Figure 4.

Output power stage configurations

pre-scale

High pass

BQ#1

Re-sampled

input

Treble

Bass

filter

mix

filter

BQ#2

BQ#3

BQ#4

De-

emphasis

filter

If CxTCB = 0

BTC: bass boost/cut

TTC: treble boost/cut

If DEMP = 1

4 biquads

User defined if AMEQ = 00

Preset EQ if AMEQ = 01

Auto loudness if AMEQ = 10

If HPB= 0

If DSPB = 0 and CxEQB = 0

Half

bridge

Half

bridge

Half

bridge

Half

bridge

Channel 1

Channel 2

OUT2A

OUT2B

OUT1A

OUT1B

Half

bridge

Half

bridge

Half

bridge

Half

bridge

Channel 2

Channel 3

OUT2A

OUT2B

OUT1A

OUT1B

Channel 1

Half

bridge

Half

bridge

Half

bridge

Half

bridge

Channel 3

OUT2A

OUT2B

OUT1A

OUT1B

2-channel (full bridge) configuration,

2.1-channel configuration,

1-channel mono-parallel configuration,

The setup register is Configuration

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