WM8998 datasheet(13/307 Pages) WOLFSON

13 / 307 page

Production Data

WM8998

PD, October 2014, Rev 4.0

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNIT

Digital supply range (Core)

See notes 2, 3, 4, 5

DCVDD

(≤24.576MHz clocking)

1.14

1.2

1.9

DCVDD

(>24.576MHz clocking)

1.71

1.8

1.9

Digital supply range (I/O)

DBVDD1

1.7

1.9

Digital supply range (I/O)

DBVDD2, DBVDD3

1.7

3.47

LDO supply range

LDOVDD

1.7

1.8

1.9

Charge Pump supply range

CPVDD

1.7

1.8

1.9

Speaker supply range

SPKVDDL, SPKVDDR

2.4

5.5

Analogue supply range

See note 2

AVDD

1.7

1.8

1.9

Ground

See note 1

DGND, AGND, CPGND,

SPKGNDL, SPKGNDR

Power supply rise time

See notes 7, 8, 9, 10

DCVDD

2000

µs

All other supplies

Operating temperature range

-40

°C

Notes:

The grounds must always be within 0.3V of AGND.

AVDD must be supplied before DCVDD. DCVDD must not be powered if AVDD is not present. There are no other power

sequencing requirements.

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

‘Sleep’ mode is supported when DCVDD is below the limits noted, provided AVDD and DBVDD1 are present.

Under default conditions, digital core clocking rates above 24.576MHz are inhibited. The register-controlled clocking limit

should only be raised when the applicable DCVDD voltage is present.

An internal Charge Pump and LDO (powered by CPVDD) provide the microphone bias supply; the MICVDD pin should not be

connected to an external supply.

DCVDD minimum rise time does not apply when this is powered using the internal LDO.

If DCVDD is supplied externally, and the rise time exceeds 2ms, then RESET

¯¯¯¯¯¯ must be asserted (low) during the rise, and held

asserted until after DCVDD is within the recommended operating limits.

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.

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

capacitor and pin.

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