WM8952ECSSLASHRV datasheet(7/72 Pages) WOLFSON

7 / 72 page

Pre Production

WM8952

PP, Rev 3.1, June 2011

ELECTRICAL CHARACTERISTICS

Test Conditions

DCVDD=1.8V, DBVDD=3.3V, AVDD=3.3V, TA = +25

oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Microphone Input PGA Inputs (MICN, MICP)

INPPGAVOL and PGABOOST = 0dB

Full-scale Input Signal Level – Single-

ended input via LIN/RIN 1

AVDD/3.3

Vrms

Full-scale Input Signal Level –

Pseudo-differential input 1,2

AVDD*0.7/

3.3

Vrms

Input PGA equivalent input noise

INPPGAVOL = +35.25dB

No input signal

0 to 20kHz

76.5

MICN input resistance

INPPGAVOL = +35.25dB

MICN input resistance

INPPGAVOL = 0dB

58.5

MICN input resistance

INPPGAVOL = -12dB

97.5

MICP input resistance

All gain settings

124.5

Input Capacitance

All analogue input pins

Maximum Input PGA Programmable

Gain

Gain adjusted by

INPPGAVOL

+33.25

+35.25

+37.25

Minimum Input PGA Programmable

Gain

Gain adjusted by

INPPGAVOL

-14.00

-12

-10.00

Programmable Gain Step Size

Guaranteed monotonic

0.75

Input PGA Mute Attenuation

INPPGAMUTE

Input Gain Boost

PGABOOST= 0

Input Gain Boost

PGABOOST = 1

+20

Auxiliary Analogue Input (AUX)

Full-scale Input Signal Level 2

AVDD/3.3

Vrms

Input Resistance

Input boost and mixer

enabled, at 0dB gain

Input Capacitance

All analogue Inputs

Maximum Gain from AUX input PGA

mixers

Gain adjusted by

AUX2BOOSTVOL

+4.00

+7.50

Minimum Gain from AUX input PGA

mixers

Gain adjusted by

AUX2BOOSTVOL

-14.00

-12

-9.00

AUX2BOOSTVOL step size

Guaranteed monotonic

Analogue to Digital Converter (ADC) - Input from MICN and MICP in differential configuration to input PGA

INPPGAVO, PGABOOST and ADCVOL = 0dB

Signal to Noise Ratio 3

SNR

A-weighted

AVDD=3.3V

Total Harmonic Distortion 4

THD

-1dBV Input

AVDD=3.3V

-83

-74

Total Harmonic Distortion + Noise 5

THD+N

-1dBV Input

AVDD=3.3V

-77

-68

Microphone Bias

Bias Voltage

MBVSEL=0

0.85*

AVDD

0.9*AVDD

0.95*

AVDD

MBVSEL=1

0.65*AVDD

Bias Current Source

for VMICBIAS within +/-3%

Output Noise Voltage

1kHz to 20kHz

nV/

√Hz

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