Pre Production
WM8941
Test Conditions
DCVDD=1.8V, DBVDD=3.3V, AVDD=3.3V, SPKVDD =3.3V, , VBVDD=3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data
unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital to Analogue Converter (DAC) to MONO Output with 10kΩ / 50pF load and DACVOL 0dB
Full-scale output 1
DACVOL = 0dB
0.9*AVDD AVDD/3.3 1.05*AVDD
/3.3 /3.3
Vrms
dB
3
Signal to Noise Ratio
SNR
A-weighted
AVDD=SPKVDD=3.3V
A-weighted
98
96
dB
AVDD=SPKVDD=2.5V
0dBFS input
Total Harmonic Distortion 4
THD
-80
dBFS
AVDD=SPKVDD=3.3V
Total Harmonic Distortion + Noise 5
Channel Separation 6
THD+N
0dBFS input
AVDD=SPKVDD=3.3V
-78
dBFS
dB
1kHz signal
100
MICP and MICN input PGA to input boost stage into 10kΩ / 50pF load on SPKOUTP and SPKOUTP
INPPGAVOL, PGABOOST = 0dB
Full-scale output voltage, 0dB gain
0.9*SPKVDD/ SPKVDD/3.3 1.05*SPKVD
3.3 D/3.3
Vrms
dB
3
Signal to Noise Ratio
SNR
THD
A-weighted
98
AVDD=SPKVDD=3.3V
full-scale signal
Total Harmonic Distortion 4
Total Harmonic Distortion + Noise 5
Channel Separation 6
dBFS
dBFS
dB
-80
-78
AVDD=SPKVDD=3.3V
full-scale signal
THD+N
AVDD=SPKVDD=3.3V
100
Speaker Output (SPKOUTP, SPKOUTN with 8Ω bridge tied load)
Output Power
Total Harmonic Distortion 4
Po
Output power is closely correlated with THD see below
THD
Po=150mW, RL = 8Ω
0.03
68
%
dB
%
SPKVDD=3.3V
Po=350mW, RL = 8Ω
SPKVDD=3.3V
A-weighted
2.944
-30.6
-98
dB
dB
Signal to Noise Ratio 3
SNR
SPKVDD=3.3V
RL = 8Ω BTL
Power Supply Rejection Ratio
(50Hz-22kHz)
PSRR
50
98
dB
dB
Headphone Output (SPKOUTP, SPKOUTN with resistive load to GND)
Signal to Noise Ratio 3
SNR
A-weighted
SPKVDD=3.3V
Total Harmonic Distortion 4
THD
Po=20mW, RL = 16Ω
SPKVDD=3.3V
0.02
-72
%
dB
Video Buffer
Maximum output voltage swing
Vom
Av
f=100kHz, THD=1%
1.10
5.08
1.25
6
1.50
7.94
Vp-p
Maximum Programmable Voltage
Gain 7
R
VBREF=187Ω, ROUT=75Ω,
dB
dB
dB
R
LOAD=75 Ω
VBREF=187Ω, ROUT=75Ω,
LOAD=75 Ω
Minimum Programmable Voltage Gain
Av
R
-0.92
-2.0
0
1.94
+2.0
7
R
Step Size
6
Differential gain
DG
Vin=1Vp-p
Vin=1Vp-p
0.3
%
Differential phase
DP
-2.0
+40
0
0.7
+60
40
+2.0
+100
75
Deg
dB
Signal to Noise Ratio
SYNC tip offset above GND
VSNR
VBDISOFF=0, Av = +6dB
mV
PP, Rev 3.3, December 2007
9
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
