WM8958 datasheet(13/377 Pages) WOLFSON

13 / 377 page

Pre-Production

WM8958

PP, August 2012, Rev 3.4

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNIT

Digital supply range (Core)

See notes 7, 8

DCVDD

1.08

1.2

2.0

Digital supply range (I/O)

DBVDD1

1.62

1.8

2.0

Digital supply range (I/O)

DBVDD2, DBVDD3

1.62

1.8

3.6

Analogue supply 1 range

See notes 3, 4, 5, 6

AVDD1

2.4

3.0

3.3

Analogue supply 2 range

AVDD2

1.71

1.8

2.0

Charge Pump supply range

CPVDD

1.71

1.8

2.0

Speaker supply range

SPKVDD1, SPKVDD2

2.7

5.0

5.5

LDO1 supply range

LDO1VDD

2.7

5.0

5.5

Ground

DGND, AGND, CPGND,

SPKGND1, SPKGND2,

REFGND, HP2GND

Power supply rise time

See notes 9, 10, 11

All supplies

s

Operating temperature range

-40

°C

Notes:

Analogue, digital and speaker grounds must always be within 0.3V of AGND.

There is no power sequencing requirement; the supplies may be enabled in any order.

AVDD1 must be less than or equal to SPKVDD1 and SPKVDD2.

An internal LDO (powered by LDO1VDD) can be used to provide the AVDD1 supply.

When AVDD1 is supplied externally (not from LDO1), the LDO1VDD voltage must be greater than or equal to AVDD1.

The WM8958 can operate with AVDD1 tied to 0V; power consumption may be reduced, but the analogue audio

functions will not be supported.

An internal LDO (powered by DBVDD1) can be used to provide the DCVDD supply.

When DCVDD is supplied externally (not from LDO2), the DBVDD1 voltage must be greater than or equal to DCVDD.

DCVDD and AVDD1 minimum rise times do not apply when these domains are powered using the internal LDOs.

10. The specified minimum power supply rise times assume a minimum decoupling capacitance of 100nF per pin.

However, Wolfson strongly advises that the recommended decoupling capacitors are present on the PCB and that

appropriate layout guidelines are observed (see “Applications Information” section).

11. The specified minimum power supply rise times also assume a maximum PCB inductance of 10nH between

decoupling capacitor and pin.

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