WM8711SEDSSLASHR datasheet(8/47 Pages) WOLFSON

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Production Data

WM8711 / WM8711L

PD Rev 4.3 September 2006

Test Conditions

AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25

oC, Slave Mode, fs = 48kHz, MCLK = 256fs

unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Stereo Headphone Output

0dB Full scale output voltage

1.0 x

AVDD/3.3

Vrms

RL = 32

Ω

Max Output Power

RL = 16

Ω

Signal to Noise Ratio (Note 1,2)

SNR

A-weighted

1kHz, RL = 32

Ω,

PO = 10mW rms

0.056

-65

0.1

-60

Total Harmonic Distortion

THD

1kHz, RL = 32

Ω,

PO = 20mW rms

0.56

-45

1.0

-40

1kHz 100mVpp

Power Supply Rejection Ratio

PSRR

20Hz to 20kHz

100mVpp

Programmable Gain

1kHz

-73

Programmable Gain Step Size

1kHz

Mute attenuation

1kHz, 0dB

Notes:

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.

All performance measurements done with 20kHz low pass filter, and where noted an A-weight 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.

VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).

TERMINOLOGY

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).

Dynamic range (dB) - DR 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. (e.g.

THD+N @ -60dB= -32dB, DR= 92dB).

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

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

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.

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

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