WM8716

Production Data

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PD, Rev 4.2,August 2008

6

Notes:

1.

Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’

weighted over a 20Hz to 20kHz bandwidth.

2.

All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher THD+N

and lower SNR and Dynamic Range 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.

3.

TERMINOLOGY

1.

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.

2.

Dynamic range (dB) (DNR) is a measure of the difference between the highest and lowest portions of a signal.

Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB

to it. (eg THD+N @ -60dB= -32dB, DR= 92dB).

3.

THD+N (dB) is a ratio of the r.m.s. values, of (Noise + Distortion)/Signal.

4.

Stop band attenuation (dB) is the degree to which the frequency spectrum is attenuated (outside audio band).

5.

Channel Separation (dB) (also known as Cross-Talk) 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.

6.

Pass-Band Ripple - Any variation of the frequency response in the pass-band region.

BCKIN

DIN

LRCIN

t

BCH

t

BCL

t

BL

t

LB

t

BCY

t

DS

t

DH

Figure 1 Audio Data Input Timing

TEST CONDITIONS

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Audio Data Input Timing Information

BCKIN pulse cycle time

100

ns

BCKIN pulse width high

50

ns

BCKIN pulse width low

50

ns

BCKIN rising edge

to LRCIN edge

30

ns

LRCIN rising edge

to BCKIN rising edge

30

ns

DIN setup time

30

ns

DIN hold time

30

ns