Production Data
WM8711BL
Test Conditions
AVDD, HPVDD, DBVDD = 1.8V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC, 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
Max Output Power
AVDD/3.3
20
Vrms
mW
PO
AVDD=HPVDD=3.3V,
RL = 32
AVDD=HPVDD=1.8V,
9
RL = 32
AVDD=HPVDD=1.8V,
18
RL = 16
Signal to Noise Ratio
A-weighted (Note 1,2)
Total Harmonic Distortion
SNR
THD
AVDD=HPVDD=3.3V
AVDD=HPVDD=1.8V
96
86
dB
80
AVDD=HPVDD=3.3V,
1kHz, RL = 32
@ PO = 14mW rms
0.07
-63
%
dB
AVDD=HPVDD=1.8V,
1kHz, RL = 32
@ PO = 4.5mW rms
0.05
-66
0.18
-55
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
50
45
dB
20Hz to 20kHz
100mVpp
Programmable Gain
1kHz
1kHz
-73
6
1
6
dB
dB
dB
Programmable Gain Step Size
Mute attenuation
1kHz, 0dB
80
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.
PD, Rev 4.2, December 2011
743
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
