WM8711 Wolfson Microelectronics Ltd., WM8711 Datasheet - Page 5

• Manufacturer Part Number: WM8711
• Description: Internet Audio DAC With Integrated Headphone Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8711
Notes:
1.
2.
3.
TERMINOLOGY
1.
2.
3.
4.
5.
6.
WOLFSON MICROELECTRONICS LTD
Test Conditions
AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, T
256fs unless otherwise stated.
PARAMETER
Stereo Headphone Output
0dB Full scale output voltage
Max Output Power RL = 32
ohms
Max Output Power RL = 16
ohms
SNR (Note 1,2)
THD
Power Supply Rejection Ratio
Programmable Gain Maximum
Programmable Gain Minimum
Programmable Gain Step Size
Mute attenuation
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).
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) - 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. (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.
SYMBOL
PSSR
P
P
O
O
1kHz, R
1kHz, R
TEST CONDITIONS
P
P
1kHz 100mVpp
20Hz to 20kHz
O
O
A-weighted
1kHz, 0dB
= 10mW rms
= 20mW rms
100mVpp
L
L
1kHz
1kHz
= 32 ohms @
= 32 ohms @
A
MIN
= +25
90
o
C, Slave Mode, fs = 48kHz, MCLK =
AVDD/3.3
1.0 x
TYP
0.1
1.0
-73
30
40
97
60
40
50
45
80
6
1
PP Rev 1.2 November 2000
MAX
0.1
1.0
60
40
Product Preview
Vrms
UNIT
mW
mW
dB
dB
dB
dB
dB
dB
dB
dB
%
%
5