TAS2557: Question of TAS2557 IOVDD Ripple Specification

Wayne Chen (Audio AE)

Part Number: TAS2557

Hi Sirs,

Do we have ripple specification for TAS2557 IOVDD's power supply? Customer found 234mV ripple on 1.8V power rail and need to know if there is any audio performance impact?

TAS2557's datasheet specifies 1.8V+/-0.15V for IOVDD. Can we say that 234mV ripple (1.8V+/-0.117mV) is within TAS2557 specification?

Thank yo and Best regards,

Wayne Chen
10/19/2018

over 7 years ago

0 José Luis over 7 years ago

TI__Mastermind 20085 points

Hi Wayne,

You can refer to 11.2 Power Supply Sequencing section of amplifier's datasheet to find how the power supplies should be power up and power down to avoid large current in the device due to faults in level shifters and diodes becoming forward biased.

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Wayne Chen (Audio AE) over 7 years ago in reply to José Luis

TI__Genius 15950 points

Hello Jose,

Thanks a lot. Customer follows up TAS2557 datasheet’s power sequence specification for sure. Would you please advise the VDDIO’s power supply ripple (?mV) requirement as customer’s power supply design guidance?

Wayne Chen
10/19/2018

0 José Luis over 7 years ago in reply to Wayne Chen (Audio AE)

TI__Mastermind 20085 points

Wayne,

The decoupling capacitors for the power supplies should be placed as close as possible to the VBAT, IOVDD, DVDD, and AVDD pins in order to ensure a right ripple specification for TAS2557. A small decoupling capacitor of 0.1uF and another decoupling capacitor of 10uF should be placed as close as possible to the device's terminals.

Best Regards
José Luis Figueroa
Audio Applications Engineer

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TAS2557: Question of TAS2557 IOVDD Ripple Specification