WM8985
Pre-Production
ELECTRICAL CHARACTERISTICS
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
Microphone Input PGA Inputs (LIP, LIN, RIP, RIN, L2, R2)
INPPGAVOLL, INPPGAVOLR, PGABOOSTL and PGABOOSTR = 0dB
Full-scale Input Signal Level –
Single-ended input via LIN/RIN 1
AVDD/3.3
Vrms
Vrms
Full-scale Input Signal Level –
Pseudo-differential input 1,2
AVDD*0.7/
3.3
Input PGA equivalent input noise
INPPGAVOLL/R = +35.25dB
150
µV
No input signal
0 to 20kHz
LIN, RIN input resistance
LIN, RIN input resistance
LIN, RIN input resistance
INPPGAVOLL and
INPPGAVOLR = +35.25dB
1.6
46
71
kΩ
kΩ
kΩ
INPPGAVOLL and
INPPGAVOLR = 0dB
INPPGAVOLL and
INPPGAVOLR = -12dB
LIP, RIP input resistance
L2, R2 input resistance
All gain settings
90
90
kΩ
kΩ
L2_2INPPGA and
R2_2INPPGA = 1
L2_2BOOSTVOL and
R2_2BOOSTVOL = 000
L2, R2 input resistance
L2, R2 input resistance
L2, R2 input resistance
L2_2INPPGA and
R2_2INPPGA = 0
11
22
60
10
kΩ
kΩ
kΩ
L2_2BOOSTVOL and
R2_2BOOSTVOL = +6dB
L2_2INPPGA and
R2_2INPPGA = 0
L2_2BOOSTVOL and
R2_2BOOSTVOL = 0dB
L2_2INPPGA and
R2_2INPPGA = 0
L2_2BOOSTVOL and
R2_2BOOSTVOL = -12dB
Input Capacitance
All analogue input pins
pF
dB
Input PGA Programmable Gain
Gain adjusted by
INPPGAVOLL and
INPPGAVOLL
-12
+35.25
Programmable Gain Step Size
Input PGA Mute Attenuation
Guaranteed monotonic
0.75
100
dB
dB
INPPGAMUTEL and
INPPGAMUTER = 1
Input Gain Boost
Input Gain Boost
PGABOOSTL and
PGABOOSTR = 0
0
dB
dB
PGABOOSTL and
PGABOOSTR = 1
+20
PP, Rev 3.4, October 2006
8
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
