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
LIN and RIN input PGA to input boost stage into 10kΩ / 50pF load on OUT3/OUT4 outputs
INPPGAVOLL, INPPGAVOLR, PGABOOSTL and PGABOOSTR = 0dB
Full-scale output voltage, 0dB gain
AVDD2/3.3
98
Vrms
dB
3
Signal to Noise Ratio
SNR
A-weighted
90
AVDD1=AVDD2=3.3V
A-weighted
96
95.5
93.5
-84
dB
dB
AVDD1=AVDD2=2.5V
22Hz to 22kHz
AVDD1=AVDD2=3.3V
22Hz to 22kHz
dB
AVDD1=AVDD2=2.5V
full-scale signal
Total Harmonic Distortion 4
Total Harmonic Distortion + Noise 5
Channel Separation 6
THD
dBFS
dBFS
dBFS
dBFS
dB
AVDD1=AVDD2=3.3V
full-scale signal
-82
AVDD1=AVDD2=2.5V
full-scale signal
THD+N
-82
AVDD1=AVDD2=3.3V
full-scale signal
-80
AVDD1=AVDD2=2.5V
100
LIN and RIN into input PGA Bypass to LOUT1 and ROUT1 into 10kΩ / 50pF loads
BYPLMIXVOL, BYPRMIXVOL, LOUT1VOL and ROUT1VOL = 0dB
Full-scale output voltage, 0dB gain
AVDD1/3.3
100
Vrms
dB
Signal to Noise Ratio 3
SNR
A-weighted
90
AVDD1=AVDD2=3.3V
A-weighted
96
95.5
93.5
-87
dB
dB
AVDD1=AVDD2=2.5V
22Hz to 22kHz
AVDD1=AVDD2=3.3V
22Hz to 22kHz
dB
AVDD1=AVDD2=2.5V
full-scale signal
Total Harmonic Distortion 4
THD
-75
-73
dBFS
dBFS
dBFS
dBFS
dB
AVDD1=AVDD2=3.3V
full-scale signal
-69
AVDD1=AVDD2=2.5V
full-scale signal
Total Harmonic Distortion + Noise 5
THD+N
-85
AVDD1=AVDD2=3.3V
full-scale signal
-68
AVDD1=AVDD2=2.5V
1kHz full scale signal
Channel separation 6
Microphone Bias
Bias Voltage
100
MBVSEL=0
MBVSEL=1
0.9*AVDD1
V
V
0.65*AVDD1
Bias Current Source
Output Noise Voltage
for VMICBIAS within +/-3%
1kHz to 20kHz
3
Ma
15
nV/√Hz
PP, Rev 3.4, October 2006
13
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
