Pre-Production
WM8985
Test Conditions
DCVDD=1.8V, AVDD1=AVDD2=DBVDD=3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DAC to L/R mixer into 10kΩ / 50pF load on L/ROUT2, class AB mode
LOUT2VOL, ROUT2VOL, DACLVOL and DACRVOL = 0dB
Full-scale output 1
LOUT2VOL and
ROUT2VOL = 0dB
A-weighted
AVDD1/3.3
100
Vrms
dB
dB
dB
dB
Signal to Noise Ratio 3
SNR
AVDD1=AVDD2=3.3V
A-weighted
96
AVDD1=AVDD2=2.5V
22Hz to 20kHz
95.5
AVDD1=AVDD2=3.3V
22Hz to 20kHz
93.5
AVDD1=AVDD2=2.5V
Total Harmonic Distortion 4
Total Harmonic Distortion + Noise 5
Channel Separation 6
THD
0dBFS input
AVDD1=AVDD2=3.3V
-84
-82
-82
-80
100
dBFS
dBFS
dBFS
dBFS
dB
0dBFS input
AVDD1=AVDD2=2.5V
THD+N
0dBFS input
AVDD1=AVDD2=3.3V
0dBFS input
AVDD1=AVDD2=2.5V
1kHz input signal
DAC to OUT3 and OUT4 mixers into OUT3/OUT4 outputs into (10kΩ / 50pF load. DACVOLL and DACVOLR = 0dB)
Full-scale output voltage
Signal to Noise Ratio 3
AVDD2/3.3
98
Vrms
dB
SNR
THD
A-weighted
AVDD1=AVDD2=3.3V
full-scale signal
92
-80
-78
Total Harmonic Distortion 4
Total Harmonic Distortion + Noise 5
Channel Separation 6
-84
-82
100
dBFS
dBFS
dB
AVDD1=AVDD2=3.3V
full-scale signal
THD+N
AVDD1=AVDD2=3.3V
1kHz signal
DAC to left and right mixer into headphone 16Ω load on LOUT1 and ROUT1
LOUT1VOL, ROUT1VOL, DACLVOL and DACRVOL = 0dB
Full-scale output
AVDD1/3.3
100
Vrms
dB
Signal to Noise Ratio 3
SNR
A-weighted
AVDD1=AVDD2=3.3V
22Hz to 20kHz
95.5
-79
dB
dBFS
dBFS
dB
AVDD1=AVDD2=3.3V
Po = 20mW, RL=16Ω
Total Harmonic Distortion 4
Total Harmonic Distortion + Noise 5
Channel Separation 6
THD
THD+N
Po = 20mW, RL=16Ω
-75
1kHz signal
100
PP, Rev 3.4, October 2006
11
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
