PCM5121 datasheet(34/121 Pages) TI2

34 / 121 page

DI N

(1)

(2)

Lch

Rch

(3)

(5)

(7)

(8)

(6)

(4)

Band

DRC

Mono

Mixer

Stereo

Mux

Stereo

Mixer

Coeff-1

Coeff-2

Master

Vol ume

2ch

Interpolation

Filter

1ch

I2S

out

PCM5121, PCM5122

SLAS763C – AUGUST 2012 – REVISED OCTOBER 2018

www.ti.com

Product Folder Links: PCM5121 PCM5122

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8.3.4.3 Fixed Audio Processing Flow (Program 5)

The PCM512x implements signal processing capabilities and interpolation filtering via processing blocks. These

fixed processing blocks give users the choice of how much and what type of signal processing they may use and

which interpolation filter is applied.

The signal processing blocks available are:

•

Biquad filters

•

Multiband DRC

•

Mono mixer

•

Stereo mixer

•

Average volume control

Users can find more details in Purepath Studio.

NOTE

This process flow requires 1024 instruction cycles. Therefore, it will only function at

sampling frequencies up to 48 kHz.

8.3.4.3.1

Filter Programming Changes

The following sequence must be followed to change the ROM program:

1. Enter Stand-by mode. (Set Page 0, Register 2, D(4))

2. Change program number. (Set Page 0, Register 43, D(4:0))

3. Exit Stand-by mode. (Reset Page 0, Register 2, D(4))

8.3.4.3.2

Processing Blocks – Detailed Descriptions

Figure 55 shows the fixed processing flow.

Figure 55. Preset Process Flow

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