TAS5504 datasheet(49/96 Pages) TI

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TAS5504 Controls and Status

SLES123 − October 2004

TAS5504

•

On TAS5504 power up or reset, the micro runs the following TAS5504 Initialization code:

−

Update Bank 1 (Write 0x00048040 to register 0x40).

−

Write bank-related I2C registers with appropriate values for Bank 1.

−

Write Bank 2 (Write 0x00058040 to register 0x40).

−

Load bank-related I2C registers with appropriate values for Bank 2.

−

Write Bank 3 (Write 0x00068040 to register 0x40).

−

Load bank-related I2C registers with appropriate values for Bank 3.

−

Select automatic bank switching (write 0x00038040 to register 0x40)

•

Now when the audio media changes, the TAS5504 automatically detects the incoming sample rate and

automatically switches to the appropriate bank.

In this example any sample rates other then 32 kHz and 44.1 kHz will use Bank 3. If other sample rates are

used, then the banks need to be set−up differently.

2.5.6 Bank Switching Example 2

Problem: The audio system uses all of the sample rates supported by the TAS5504. How can the automatic

bank switching be set up to handle this situation?

Strategy: Use the TAS5504 bank switching feature to allow for managing and switching three banks

associated with sample rates as follows:

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Bank 1: Coefficients for 32 kHz, 38 kHz, 44.1 kHz, and 48 kHz

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Bank 2: Coefficients for 88.2kHz and 96 kHz

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Bank 3: Coefficients for 176.4 kHz and 192 kHz

One possible algorithm is to generate, load, and automatically manage bank switching for this problem:

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Generate bank-related coefficients for sample rates 48 kHz (Bank 1), 96 kHz (Bank 2), and 192 kHz (Bank

3) and include the same in the micro-based TAS5504 I2C firmware.

•

On TAS5504 power−up or reset, the micro runs the following TAS5504 Initialization code:

−

Update Bank 1 (Write 0x0004F00C to register 0x40).

−

Write bank-related I2C registers with appropriate values for Bank 1.

−

Write Bank 2 (Write 0x0005F00C to register 0x40).

−

Load bank-related I2C registers with appropriate values for Bank 2.

−

Write Bank 3 (Write 0x0006F00C to register 0x40).

−

Load bank-related I2C registers with appropriate values for Bank 3.

−

Select automatic bank switching (Write 0x0003F00C to register 0x40)

•

Now when the audio media changes, the TAS5504 automatically detects the incoming sample rate and

automatically switches to the appropriate bank.

TAS5504 Datasheet(PDF) 49 Page - Texas Instruments

TAS5504 Datasheet(HTML) 49 Page - Texas Instruments

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