Production Data

WM8711 / WM8711L

w

PD Rev 4.3 September 2006

8

Test Conditions

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

30

Max Output Power

RL = 16

Ω

55

mW

Signal to Noise Ratio (Note 1,2)

SNR

A-weighted

90

98

dB

Ω,

0.056

-65

0.1

-60

Total Harmonic Distortion

THD

Ω,

0.56

-45

1.0

-40

%

dB

1kHz 100mVpp

50

Power Supply Rejection Ratio

PSRR

20Hz to 20kHz

100mVpp

45

dB

Programmable Gain

1kHz

-73

6

6

dB

Programmable Gain Step Size

1kHz

1

dB

Mute attenuation

1kHz, 0dB

80

dB

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, 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.

3.

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

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. (No Auto-zero or Automute function is employed in achieving these results).

2.

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).

3.

THD+N (dB) - THD+N is a ratio, of the rms 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. 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.

6.

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