Production Data
WM8711 / WM8711L
Test Conditions
AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, T
A
= +25
o
C, Slave Mode, fs = 48kHz, MCLK = 256fs
unless otherwise stated.
PARAMETER
Stereo Headphone Output
0dB Full scale output voltage
Max Output Power
Signal to Noise Ratio (Note 1,2)
Total Harmonic Distortion
P
O
SNR
THD
RL = 32Ω
RL = 16Ω
A-weighted
1kHz, R
L
= 32Ω,
P
O
= 10mW rms
1kHz, R
L
= 32Ω,
P
O
= 20mW rms
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
20Hz to 20kHz
100mVpp
Programmable Gain
Programmable Gain Step Size
Mute attenuation
Notes:
1.
2.
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).
1kHz
1kHz
1kHz, 0dB
-73
90
1.0 x
AVDD/3.3
30
55
98
0.056
-65
0.56
-45
50
45
6
1
80
6
dB
dB
dB
0.1
-60
1.0
-40
dB
dB
%
dB
mW
Vrms
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
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. (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.
4.
5.
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.
6.
Pass-Band Ripple - Any variation of the frequency response in the pass-band region.
w
PD Rev 4.3 September 2006
8
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
