WM8994ECSSLASHR datasheet(28/363 Pages) CIRRUS

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WM8994

Rev 4.6

MICROPHONE BIAS CHARACTERISTICS

Test Conditions

AVDD1=3.0V (powered from LDO1), DCVDD=1.0V (powered from LDO2), AVDD2=DBVDD=LDO2VDD=CPVDD=1.8V,

LDO1VDD=SPKVDD1=SPKVDD2=5V, DGND=AGND=CPGND=SPKGND1=SPKGND2=HP2GND=0V,

TA = +25

oC, unless otherwise stated.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Microphone Bias (MICBIAS1 and MICBIAS2)

Bias Voltage

2.4mA load current

MICBn_LVL=0

-5%

0.9

AVDD1

+5%

2.4mA load current

MICBn_LVL=1

-5%

0.65

AVDD1

+5%

Bias Current

2.4

Output Noise Spectral Density

1kHz to 20kHz

100

nV/

Hz

Output discharge resistance

MICBn_ENA=0,

MICBn_DISCH=1

Ω

MIC Current Detect Thresholds

MICD_THR = 00

150

A

MICD_THR = 01

300

A

MICD_THR = 10

600

A

MICD_THR = 11

1200

A

MIC Short Circuit Detect Thresholds

MIC_SCTHR = 00

300

A

MIC_SCTHR = 01

600

A

MIC_SCTHR = 10

1200

A

MIC_SCTHR = 11

2400

A

Current detect and short circuit detect thresholds are subject to a +/-50% across temperature, supply and part-to-part

variation. This should be factored into any application design.

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