WM8952ECSSLASHRV datasheet(8/72 Pages) WOLFSON

8 / 72 page

WM8952

Pre Production

PP, Rev 3.1, June 2011

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

Digital Input / Output

Input HIGH Level

VIH

0.7

DBVDD

DBVDD+0.7

Input LOW Level

VIL

GND-0.7

0.3

×DBVDD

Output HIGH Level

VOH

IOL=1mA

0.9

DBVDD

Output LOW Level

VOL

IOH-1mA

GND

0.1xDBVDD

Input Capacitance

All digital pins

Input leakage

All digital pins except MODE

-900

+900

MODE pin

-90

+90

μA

TERMINOLOGY

Full-scale input levels scale in relation to AVDD depending upon the input or output used. For example, when AVDD

= 3.3V, 0dBFS = 1Vrms (0dBV). When AVDD < 3.3V the absolute level of 0dBFS will decrease with a linear

relationship to AVDD.

Input level to RIP and LIP in differential configurations is limited to a maximum of -3dB or performance will be

reduced.

Signal-to-noise ratio (dB) – SNR is the difference in level between a reference full scale output signal and the device

output with no signal applied. This ratio is also called idle channel noise. (No Auto-zero or Automute function is

employed in achieving these results).

THD is the difference in level between a reference output signal and the first seven harmonics of the output signal. To

calculate the ratio, the fundamental frequency of the output signal is notched out and an RMS value of the next seven

harmonics is calculated.

Total Harmonic Distortion plus Noise (dB) – THD+N is the difference in level between a reference output signal and

the sum of the harmonics, wide-band noise and interference on the output signal. To calculate the ratio, the

fundamental frequency of the output signal is notched out and an RMS value of the total harmonics, wide-band noise

and interference is calculated.

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