WM8904
Pre-Production
OUTPUT SIGNAL PATH
High Performance Stereo Playback to Headphones - DAC input to HPOUTL+HPOUTR pins with 15 load
Test conditions:
HPOUTL_VOL = HPOUTR_VOL = 111001b (0dB)
Low Power Playback mode disabled. (See Table 49 for details; note that Low Power Playback mode is disabled by default.)
PARAMETER
SYMBOL
TEST CONDITIONS
1% THD
MIN
TYP
28
MAX
UNIT
mW
Output Power (per Channel)
Po
RLoad= 30
0.92
-0.76
32
Vrms
dBV
mW
1% THD
RLoad= 15
0.69
-3.19
Vrms
dBV
DC Offset
DC servo enabled,
calibration complete.
-1.5
90
+1.5
-80
mV
dB
Signal to Noise Ratio
SNR
A-weighted
96
-91
-84
-87
-85
100
90
Total Harmonic Distortion + Noise
THD+N
RL=30; Po=2mW
RL=30; Po=20mW
RL=15; Po=2mW
RL=15; Po=20mW
1kHz signal, 0dBFS
10kHz signal, 0dBFS
1kHz signal, 0dBFS
217Hz, 100mVpk-pk
1kHz, 100mV pk-pk
dB
Channel Separation
dB
dB
dB
Channel Level Matching
+/-1
75
Power Supply Rejection Ratio
PSRR
70
Low Power Stereo Playback to Headphones - DAC input to HPOUTL+HPOUTR pins with 15 load
Test conditions:
HPOUTL_VOL = HPOUTR_VOL = 111001b (0dB)
Low Power Playback Mode enabled (see Table 48 for details)
PARAMETER
SYMBOL
TEST CONDITIONS
1% THD
MIN
TYP
27
MAX
UNIT
mW
Vrms
dBV
mW
Vrms
dBV
dB
Output Power (per Channel)
Po
RLoad= 30
0.90
-0.92
30
1% THD
RLoad= 15
0.67
-3.5
95
Signal to Noise Ratio
SNR
A-weighted
Total Harmonic Distortion + Noise
THD+N
RL=30; Po=2mW
RL=30; Po=20mW
RL=15; Po=2mW
RL=15; Po=20mW
-91
-83
dB
-87
-80
PP, Rev 3.3, September 2012
16
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
