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
Auxiliary Analogue Inputs (AUXL, AUXR)
Full-scale Input Signal Level 2
AVDD/3.3
11
Vrms
Input Resistance
Left Input boost and mixer
enabled, at +6dB
kΩ
Left Input boost and mixer
enabled, at 0dB gain
Left Input boost and mixer
enabled, at -12dB gain
Right Input boost, mixer
enabled, at +6dB gain
Right Input boost, mixer
enabled, at 0dB gain
Right Input boost, mixer
enabled, at -12dB gain
All analogue Inputs
22
60
11
22
60
10
kΩ
kΩ
kΩ
kΩ
kΩ
Input Capacitance
pF
dB
Gain range from AUXL and AUXR
input to left and right input PGA
mixers
-12
-12
+6
+6
Gain adjusted by
AUXL2BOOSTVOL and
AUXR2BOOSTVOL
AUXLBOOSTVOL and
AUXRBOOSTVOL step size
3
dB
dB
L2, R2 Line Input Programmable Gain
Gain range from L2/R2 input to left
and right input PGA mixers
Gain adjusted by
L2_2BOOSTVOL and
R2_2BOOSTVOL
L2/R2_2BOOSTVOL step size
3
dB
dB
L2/R2_2BOOSTVOL mute
attenuation
100
OUT4 to left or right input boost record path
Gain range into left and right input
PGA mixers
Gain adjusted by
OUT4_2ADCVOL
-6
+12
dB
OUT4_2ADCVOL gain step size
OUT4_2ADCVOL mute attenuation
Reference Voltage (VMID)
3
dB
dB
100
Reference voltage accuracy
VMID
AVDD = 3.3V
TBD
%
Analogue to Digital Converter (ADC) - Input from LIN/P and RIN/P in differential configuration to input PGA
INPPGAVOLL, INPPGAVOLR, PGABOOSTL, PGABOOSTR, ADCLVOL and ADCRVOL = 0dB
Signal to Noise Ratio 3
SNR
A-weighted
AVDD1=AVDD2=3.3V
A-weighted
92.5
91.5
90
dB
dB
AVDD1=AVDD2=2.5V
22Hz to 20kHz
dB
AVDD1=AVDD2=3.3V
22Hz to 20kHz
90
dB
AVDD1=AVDD2=2.5V
-7dBV Input
Total Harmonic Distortion 4
THD
-75
-75
-72
-70
-68
dBFS
dBFS
dBFS
AVDD1=AVDD2=3.3V
-7dBV Input
AVDD1=AVDD2=2.5V
-7dBV Input
Total Harmonic Distortion + Noise 5
THD+N
AVDD1=AVDD2=3.3V
PP, Rev 3.4, October 2006
9
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
