TAS5707APHPR datasheet(32/58 Pages) TI1

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AVDD/DVDD

PDN

PVDD

RESET

T0420-01

I S

I C

2ms

0ns

TAS5707, TAS5707A

SLOS556B – NOVEMBER 2008 – REVISED NOVEMBER 2009

www.ti.com

Figure 37. Power Loss Sequence

Recommended Command Sequences

The DAP has two groups of commands. One set is for configuration and is intended for use only during

initialization. The other set has built-in click and pop protection and may be used during normal operation while

audio is streaming. The following supported command sequences illustrate how to initialize, operate, and

shutdown the device.

Initialization Sequence

Use the following sequence to power-up and initialize the device:

Hold all digital inputs low and ramp up AVDD/DVDD to at least 3V.

Initialize digital inputs and PVDD supply as follows:

•

Drive RESETZ=0, PDNZ=1, and other digital inputs to their desired state while ensuring that

all are never more than 2.5V above AVDD/DVDD. Provide stable and valid I2S clocks

(MCLK, LRCLK, and SCLK). Wait at least 100us, drive RESETZ=1, and wait at least another

13.5ms.

•

Ramp up PVDD to at least 8V while ensuring that it remains below 6V for at least 100us after

AVDD/DVDD reaches 3V. Then wait at least another 10us.

Trim oscillator (write 0x00 to register 0x1B) and wait at least 50ms.

Configure the DAP via I2C (see Users's Guide for typical values):

Biquads (0x29-36)

DRC parameters (0x3A-3C, 0x40-42, and 0x46)

Bank select (0x50)

Configure remaining registers

Exit shutdown (sequence defined below).

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TAS5707APHPR Datasheet(PDF) 32 Page - Texas Instruments