WM8993 datasheet(25/229 Pages) WOLFSON

25 / 229 page

Production Data

WM8993

PD, November 2010, Rev 4.0

Test Conditions

DCVDD = 1.2V, AVDD2 = DBVDD = CPVDD = 1.8V, AVDD1 = 3.0V, SPKVDD = 5V, DGND=AGND=CPGND=SPKGND=0V,

TA = +25

oC, 1kHz sinusoidal signal, fs = 48kHz, PGA gain = 0dB, 24-bit audio data unless otherwise stated.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

FLL

H22

Input Frequency

FLL_CLK_REF_DIV = 00

0.032

13.5

MHz

FLL_CLK_REF_DIV = 01

0.032

MHz

H23

Lock time

FREF=32kHz,

FOUT=12.288MHz

2.5

FREF=12MHz,

FOUT=12.288MHz

300

μs

H24

Free-running mode start-up time

VMID enabled

100

μs

H25

Free-running mode frequency accuracy

Reference supplied initially

+/-10

No reference provided

+/-30

GPIO

H26

Interrupt response time for accessory /

button detect

Input de-bounced

219 / fCLK_SYS

222 / fCLK_SYS

Input not de-bounced

TERMINOLOGY

Signal-to-Noise Ratio (dB) – SNR is a measure of the difference in level between the maximum full scale output

signal and the output with no input signal applied.

Total Harmonic Distortion (dB) – THD is the level of the rms value of the sum of harmonic distortion products relative

to the amplitude of the measured output signal.

Total Harmonic Distortion plus Noise (dB) – THD+N is the level of the rms value of the sum of harmonic distortion

products plus noise in the specified bandwidth relative to the amplitude of the measured output signal.

Crosstalk (L/R) (dB) – left-to-right and right-to-left channel crosstalk is the measured signal level in the idle channel at

the test signal frequency relative to the signal level at the output of the active channel. The active channel is

configured and supplied with an appropriate input signal to drive a full scale output, with signal measured at the

output of the associated idle channel.

Multi-Path Channel Separation (dB) – is the measured signal level in the idle path at the test signal frequency relative

to the signal level at the output of the active path. The active path is configured and supplied with an appropriate input

signal to drive a full scale output, with signal measured at the output of the specified idle path.

Mute Attenuation – This is a measure of the difference in level between the full scale output signal and the output with

mute applied.

All performance measurements carried out with 20kHz low pass filter, and where noted an A-weighted filter. Failure to

use such a filter will result in higher THD and lower SNR readings than are found in the Electrical Characteristics. The

low pass filter removes out of band noise; although it is not audible it may affect dynamic specification values.

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