WM8985GEFLSLASHR datasheet(14/118 Pages) WOLFSON

14 / 118 page

WM8985

Pre-Production

PP, Rev 3.5, March 2007

Test Conditions

DCVDD=1.8V, AVDD1=AVDD2=DBVDD=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

×DBV

Input LOW Level

VIL

0.3

×DBVDD

Output HIGH Level

VOH

IOL=1mA

0.9

×DBV

Output LOW Level

VOL

IOH-1mA

0.1xDBVDD

Input Capacitance

All digital pins

Input leakage

TBD

TERMINOLOGY

Full-scale input and output levels scale in relation to AVDD or AVDD2 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 (dBFS) – 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).

Total Harmonic Distortion (dB) – 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.

Channel Separation (dB) – Also known as Cross-Talk. This is a measure of the amount one channel is isolated from

the other. Normally measured by sending a full scale signal down one channel and measuring the other.

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