TAS5706APAPR datasheet(39/71 Pages) TI1

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2C SERIAL CONTROL COMMAND CHARACTERISTICS

TAS5706A

TAS5706B

www.ti.com............................................................................................................................................. SLOS606D – MARCH 2009 – REVISED SEPTEMBER 2009

The DAP has two groups of I2C commands. One set is commands that are designed specifically to be operated

while audio is streaming and that have built-in mechanisms to prevent noise, clicks, and pops. The other set

does not have this built-in protection.

Commands that are designed to be adjusted while audio is streaming:

• Master volume

• Master mute

• Individual channel volume

• Individual channel mute

Commands that are normally issued as part of initialization:

• Serial data interface format

• De-emphasis

• Sample-rate conversion

• Input multiplexer

• Output multiplexer

• Biquads

• Down mix

• Channel delay

• Enable/disable dc blocking

• Hard/soft unmute from clock error

• Enable/disable headphone outputs

Start-up sequence for correct device operation

This sequence must be followed to ensure proper operation.

1. Hold ALL logic inputs low. Power up AVDD/DVDD and wait for the inputs to settle in the allowed range.

2. Drive PDN = 1, MUTE = 1, and drive other logic inputs to the desired state.

3. Provide a stable MCLK, LRCLK, and SCLK (clock errors must be avoided during the initialization sequence) .

4. After completing step 3, wait 100

µs, then drive RESET = 1, and wait 13.5 ms after RESET goes high.

5. Trim the internal oscillator (write 0x00 to register 0x1B).

6. Wait 50 ms while the part acquires lock.

7. Configure the DAP via I2C, e.g.:

–

Downmix control (0x21)

–

Biquads (0x23–0x24 and 0x29–0x38)

–

DRC parameters and controls (0x3A–0x46)

–

Bank select (0x50)

NOTE: User may not issue any I2C reads or writes to the above registers after this step is complete.

8. Configure remaining I2C registers, e.g.:

–

Shutdown group

–

De-emphasis

–

Input multiplexers

–

Output multiplexers

–

Channel delays

–

DC blocking

–

Hard/soft unmute from clock error

–

Serial data interface format

–

Clock register (manual clock mode only)

NOTE: The BKND_ERR register (0x1C) can only be written once with a value that is not reserved (00

and 01 are reserved values).

9. Exit all-channel shutdown (write 0 to bit 6 of register 0x05).

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Product Folder Link(s): TAS5706A TAS5706B

TAS5706A is Not Recommended for New Designs

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