Pre-Production
Test Conditions
DCVDD = 1.5V, DBVDD = 3.3V, AVDD = HPVDD = 3.3V, T
A
= +25
o
C, 1kHz signal, fs = 48kHz, PGA gain = 0dB,
ADCOSR = DACOSR = 1 (64 fs), 24-bit audio data unless otherwise stated.
PARAMETER
Signal to Noise Ratio
(A-weighted)
Analogue Reference Levels
Midrail Reference Voltage
Buffered Reference Voltage
Microphone Bias
Bias Voltage
Bias Current Source
Output Noise Voltage
Digital Input / Output
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
V
IH
V
IL
V
OH
V
OL
I
OH
= +1mA
I
OL
= -1mA
0.9×DBVDD
0.7×DBVDD
V
MICBIAS
I
MICBIAS
Vn
1K to 20kHz
15
3mA load current
–5%
0.9×AVDD
+ 5%
3
VMID
VREF
–3%
–3%
AVDD/2
AVDD/2
+3%
+3%
SYMBOL
SNR
TEST CONDITIONS
AVDD=HPVDD =3.3V
MIN
TYP
98
MAX
WM8987L
UNIT
dB
V
V
V
mA
nV/√Hz
V
0.3×DBVDD
0.1×DBVDD
V
V
V
w
PP Rev 3.0 January 2007
7
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
