WM8985
Pre-Production
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
-7dBV Input
MIN
TYP
MAX
UNIT
-72
dBFS
AVDD1=AVDD2=2.5V
1kHz full scale input signal
Channel Separation 6
100
dBFS
Analogue to Digital Converter (ADC) - Input from L2, R2 into left and right PGA mixer. INPPGAVOLL, INPPGAVOLR,
L2_2BOOSTVOL, R2_2BOOSTVOL, ADCLVOL and ADCRVOL = 0dB
Signal to Noise Ratio 3
SNR
A-weighted
AVDD1=AVDD2=3.3V
A-weighted
85
92.5
92.5
90
dB
dB
AVDD1=AVDD2=2.5V
22Hz to 20kHz
dB
AVDD1=AVDD2=3.3V
22Hz to 20kHz
90
dB
AVDD1=AVDD2=2.5V
-1dBV Input
Total Harmonic Distortion 4
Total Harmonic Distortion + Noise 5
Channel Separation 6
THD
-83
-66
-81
-65
100
-78
-70
dBFS
dBFS
dBFS
dBFS
dBFS
AVDD1=AVDD2=3.3V
-1dBV Input
AVDD1=AVDD2=2.5V
-1dBV Input
THD+N
AVDD1=AVDD2=3.3V
-1dBV Input
AVDD1=AVDD2=2.5V
1kHz input signal
DAC to left and right mixers into 10kΩ / 50pF load on LOUT1 and ROUT1
LOUT1VOL, ROUT1VOL, DACLVOL and DACRVOL = 0dB
Full-scale output 1
LOUT1VOL and
ROUTVOL = 0dB
A-weighted
AVDD1/3.3
98
Vrms
dB
3
Signal to Noise Ratio
SNR
AVDD1=AVDD2=3.3V
A-weighted
96
dB
AVDD1=AVDD2=2.5V
22Hz to 20kHz
95.5
93.5
-84
dB
AVDD1=AVDD2=3.3V
22Hz to 20kHz
dB
AVDD1=AVDD2=2.5V
0dBFS input
Total Harmonic Distortion 4
THD
dBFS
AVDD1=AVDD2=3.3V
0dBFS input
AVDD1=AVDD2=2.5V
-84
-82
-82
100
dBFS
dBFS
dBFS
dB
Total Harmonic Distortion + Noise 5
Channel Separation 6
THD+N
0dBFS input
AVDD1=AVDD2=3.3V
0dBFS input
AVDD1=AVDD2=2.5V
1kHz signal
PP, Rev 3.4, October 2006
10
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
