WM8904ECSSLASHR datasheet(19/188 Pages) WOLFSON

19 / 188 page

Pre-Production

WM8904

PP, Rev 3.3, September 2012

OTHER PARAMETERS

VMID Reference

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Midrail Reference Voltage

(VMIDC pin)

-3%

AVDD/2

+3%

Charge up time (from fully discharged

to 10% below VMID)

External capacitor

4.7

F

890

μs

Microphone Bias (for analogue electret condenser microphones)

Additional test conditions: MICBIAS_ENA=1, all parameters measured at the MICBIAS pin

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Bias Voltage.

Note: 7/6 and 9/10 are available

only if MICVDD > AVDD.

Note: 3/2 and 4/3 are available

only if MICVDD ≥ 2.5V.

VMICBIAS

MICVDD = 2.5V

3mA load current,

MICBIAS_SEL = 1xx

-10%

3/2 x AVDD

+10%

MICBIAS_SEL = 011

-10%

4/3 x AVDD

+10%

MICBIAS_SEL = 010

-10%

7/6 x AVDD

+10%

MICBIAS_SEL = 001

-10%

10/9 x AVDD

+10%

MICBIAS_SEL = 000

-10%

9/10 ×AVDD

+10%

Drop out voltage between

MICVDD and MICBIAS

200

Maximum source current

IMICBIAS

Noise spectral density

At 1kHz

nV/√Hz

Power Supply Rejection Ratio

MICVDD to MICBIAS

PSRR

1kHz, 100mV pk-pk

MICVDD = 1.71 V

20kHz, 100mV pk-pk

MICVDD = 1.71 V

1kHz, 100mV pk-pk

MICVDD = 2.5 V

20kHz, 100mV pk-pk

MICVDD = 2.5 V

1kHz, 100mV pk-pk

MICVDD = 3.6 V

20kHz, 100mV pk-pk

MICVDD = 3.6 V

Power Supply Rejection Ratio

MICVDD and AVDD to

MICBIAS

PSRR

1kHz, 100mV pk-pk

AVDD = MICVDD = 1.8 V

20kHz, 100mV pk-pk

AVDD = MICVDD = 1.8 V

MICBIAS Current Detect Function (See Note 1)

Current Detect Threshold

(Microphone insertion)

MICDET_THR = 00

A

Current Detect Threshold

(Microphone removal)

Delay Time for Current Detect

Interrupt

tDET

3.2

MICBIAS Short Circuit (Hook Switch) Detect Function (See Note 1)

Short Circuit Detect Threshold

(Button press)

MICSHORT_THR = 00

600

A

Short Circuit Detect Threshold

(Button release)

400

Minimum Delay Time for

Short Circuit Detect Interrupt

tSHORT

Note 1 : If AVDD

 1.8, current threshold values should be multiplied by (AVDD/1.8)

WM8904ECS/R Datenblatt(PDF) 19 Page - Wolfson Microelectronics plc

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