WM8950 datasheet(7/52 Pages) WOLFSON

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Preliminary Technical Data

WM8950

PTD Rev 2.1 June 2005

Test Conditions

DCVDD = 1.8V, AVDD = DBVDD = 3.3V, SPKVDD = 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 Bias

Bias Voltage (MBVSEL=0)

VMICBIAS

0.9*AVDD

Bias Voltage (MBVSEL=1)

VMICBIAS

0.75*AVDD

Bias Current Source

IMICBIAS

Output Noise Voltage

1K to 20kHz

nV/

√Hz

Digital Input / Output

Input HIGH Level

VIH

0.7

×DVDD

Input LOW Level

VIL

0.3

×DVDD

Output HIGH Level

VOH

IOL=1mA

0.9

×DVDD

Output LOW Level

VOL

IOH-1mA

0.1xDVDD

TERMINOLOGY

MICN input only in single ended microphone configuration. Maximum input signal to MICP without distortion is -3dBV.

Hold Time is the length of time between a signal detected being too quiet and beginning to ramp up the gain. It does

not apply to ramping down the gain when the signal is too loud, which happens without a delay.

Ramp-up and Ramp-Down times are defined as the time it takes for the PGA to change it’s gain by 6dB.

All hold, ramp-up and ramp-down times scale proportionally with MCLK

Signal-to-noise ratio (dB) – SNR is a measure of the difference in level between the full scale output and the output with

no signal applied. (No Auto-zero or Automute function is employed in achieving these results).

THD+N (dB) – THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.

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