WM8998 datasheet(22/307 Pages) WOLFSON

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WM8998

Production Data

PD, October 2014, Rev 4.0

Test Conditions

DBVDD1 = DBVDD2 = DBVDD3 = LDOVDD = CPVDD = AVDD = 1.8V,

DCVDD = 1.2V (powered from LDO1), MICVDD = 3.0V (powered from LDO2), SPKVDDL = SPKVDDR = 4.2V,

TA = +25ºC, 1kHz sinusoid signal, fs = 48kHz, Input PGA gain = 0dB, 24-bit audio data unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

External Accessory Detect

Load impedance detection range

Detection via HPDETL pin

(ACCDET_MODE=001) or

HPDETR pin

(ACCDET_MODE=010)

HP_IMPEDANCE_

RANGE=00

Ω

HP_IMPEDANCE_

RANGE=01

100

HP_IMPEDANCE_

RANGE=10

100

1000

HP_IMPEDANCE_

RANGE=11

1000

10000

Load impedance detection range

Detection via the MICDET1 or

MICDET2 pin

(ACCDET_MODE=100)

400

6000

Ω

Load impedance detection

accuracy

(ACCDET_MODE=001, 010 or

100)

-30

+30

Load impedance detection range

Detection via the MICDET1 or

MICDET2 pin

(ACCDET_MODE=000).

2.2kΩ (2%) MICBIAS resistor.

Note these characteristics assume

no other component is connected

to MICDETn. See “Applications

Information” for recommended

external components when a

typical microphone is present.

for MICD_LVL[0] = 1

Ω

for MICD_LVL[1] = 1

for MICD_LVL[2] = 1

for MICD_LVL[3] = 1

for MICD_LVL[4] = 1

115

160

for MICD_LVL[5] = 1

207

381

for MICD_LVL[8] = 1

475

30000

Jack Detection input threshold

voltage (JACKDET)

VJACKDET

Jack insertion

0.5 x AVDD

Jack removal

0.85 x AVDD

Jack Detect pull-up resistance

0.65

1.3

MΩ

WM8998 Datasheet(PDF) 22 Page - Wolfson Microelectronics plc

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