WM8711_10 Datasheet, PDF (10/47 Pages) Wolfson Microelectronics plc – Internet Audio DAC with Integrated Headphone Amplifier

Production Data
WM8711 / WM8711L
Test Conditions
AVDD, HPVDD, DBVDD = 1.8V, 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
DAC channel separation
1kHz, 0dB signal
100
Analogue Line Input to Line Output (Load = 10kΩ. 50pF, No Gain on Input ) Bypass Mode
0dB Full scale output voltage
1.0 x
AVDD/3.3
Signal to Noise Ratio
SNR
90
101
(Note 1,2)
Total Harmonic Distortion
THD
1kHz, 0dB
-93
Stereo Headphone Output
0dB Full scale output voltage
1.0 x
AVDD/3.3
Max Output Power
PO
RL = 32Ω
9
RL = 16Ω
18
Signal to Noise Ratio
SNR
A-weighted
80
86
(Note 1,2)
Total Harmonic Distortion
THD
1kHz, RL = 32Ω @ PO =
5mW rms
MAX
-85
0.18
-55
UNIT
dB
Vrms
dB
dB
Vrms
mW
dB
%
dB
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
50
dB
20Hz to 20kHz
45
100mVpp
Programmable Gain
1kHz
-73
6
6
dB
Programmable Gain Step Size
1kHz
1
dB
Mute attenuation
1kHz, 0dB
80
dB
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.
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PD Rev 4.4 April 2007
10