WM1811A datasheet(26/328 Pages) WOLFSON

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WM1811A

Production Data

PD, November 2013, Rev 4.1

MICROPHONE BIAS CHARACTERISTICS

Test Conditions

AVDD1=3.0V (powered from LDO1), DCVDD=1.05V (powered from LDO2),

AVDD2=DBVDD1=DBVDD2=DBVDD3=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)

Note - No capacitor on MICBIASn

Note - In regulator mode, it is required that AVDD1 - VMICBIASn> 200mV

Bias Voltage

Regulator mode (MICBn_MODE=0)

Load current ≤ 1.0mA

MICBn_LVL = 000

-5%

1.5

+5%

MICBn_LVL = 001

-5%

1.8

+5%

MICBn_LVL = 010

-5%

1.9

+5%

MICBn_LVL = 011

-5%

2.0

+5%

MICBn_LVL = 100

-5%

2.2

+5%

MICBn_LVL = 101

-5%

2.4

+5%

MICBn_LVL = 110

-5%

2.5

+5%

MICBn_LVL = 111

-5%

2.6

+5%

Bias Voltage

Bypass mode (MICBn_MODE=1)

Load current ≤ 3.6mA

AVDD1 -

80mV

AVDD1

Bias Current

Regulator mode

(MICBn_MODE=0)

2.4

Bypass mode

(MICBn_MODE=1)

3.6

Output Noise Density

Regulator mode

(MICBn_MODE=0),

MICBn_LVL = 100,

Load current = 1mA,

Measured at 1kHz

nV/

Hz

Integrated Noise Voltage

Regulator mode

(MICBn_MODE=0),

MICBn_LVL = 100,

Load current = 1mA,

100Hz to 7kHz, A-weighted

4.5

µVRMS

PSRR (AVDD1)

100mV (pk-pk) 217Hz

MICBn_LVL = 000

MICBn_LVL = 001

MICBn_LVL = 010

MICBn_LVL = 011

MICBn_LVL = 100

MICBn_LVL = 101

MICBn_LVL = 110

MICBn_LVL = 111

PSRR (AVDD2, CPVDD, DBVDDn)

100mV (pk-pk) 217Hz

MICBn_LVL = 000

MICBn_LVL = 001

MICBn_LVL = 010

MICBn_LVL = 011

MICBn_LVL = 100

MICBn_LVL = 101

MICBn_LVL = 110

MICBn_LVL = 111

Load capacitance

Regulator mode

(MICBn_MODE=0)

Output discharge resistance

MICBn_ENA=0,

MICBn_DISCH=1

kΩ

WM1811A Datasheet(PDF) 26 Page - Wolfson Microelectronics plc

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