wm8941 Wolfson Microelectronics plc, wm8941 Datasheet - Page 9

• Manufacturer Part Number: wm8941
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

Production Data
w
Headphone Output (SPKOUTP, SPKOUTN with resistive load to GND)
Test Conditions
DCVDD=1.8V, DBVDD=3.3V, AVDD=3.3V, SPKVDD =3.3V, , VBVDD=3.3V, T
unless otherwise stated.
PARAMETER
Digital to Analogue Converter (DAC) to MONO Output with 10kΩ / 50pF load and DACVOL 0dB
Full-scale output
Signal to Noise Ratio
Total Harmonic Distortion
Total Harmonic Distortion + Noise
Channel Separation
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
Signal to Noise Ratio
Total Harmonic Distortion
Total Harmonic Distortion + Noise
Channel Separation
Speaker Output (SPKOUTP, SPKOUTN with 8Ω bridge tied load)
Output Power
Total Harmonic Distortion
Signal to Noise Ratio
Power Supply Rejection Ratio
(50Hz-22kHz)
Signal to Noise Ratio
Total Harmonic Distortion
Video Buffer
Maximum output voltage swing
Maximum Programmable Voltage
Gain
Minimum Programmable Voltage Gain
7
Step Size
Differential gain
Differential phase
Signal to Noise Ratio
SYNC tip offset above GND
7
1
6
6
3
3
3
3
4
4
4
4
5
5
SYMBOL
THD+N
THD+N
VSNR
SNR
SNR
SNR
SNR
THD
THD
THD
THD
Vom
PSRR
DG
DP
Po
Av
Av
AVDD=SPKVDD=3.3V
AVDD=SPKVDD=3.3V
AVDD=SPKVDD=3.3V
VBDISOFF=0, Av = +6dB
AVDD=SPKVDD=3.3V
AVDD=SPKVDD=2.5V
AVDD=SPKVDD=3.3V
R
R
AVDD=SPKVDD=3.3V
VBREF
VBREF
Po=150mW, RL = 8Ω
Po=350mW, RL = 8Ω
Po=20mW, RL = 16Ω
f=100kHz, THD=1%
full-scale signal
full-scale signal
TEST CONDITIONS
DACVOL = 0dB
A-weighted
SPKVDD=3.3V
SPKVDD=3.3V
SPKVDD=3.3V
SPKVDD=3.3V
SPKVDD=3.3V
0dBFS input
A-weighted
A-weighted
0dBFS input
R
=187Ω, R
=187Ω, R
1kHz signal
R
R
A-weighted
A-weighted
Vin=1Vp-p
Vin=1Vp-p
L
LOAD
LOAD
= 8Ω BTL
Output power is closely correlated with THD see below
=75 Ω
=75 Ω
OUT
OUT
=75Ω,
=75Ω,
0.9*SPKVDD/
A
= +25
0.9*AVDD
3.3
/3.3
90
-0.92
1.10
5.08
-2.0
-2.0
+40
o
MIN
C, 1kHz signal, fs = 48kHz, 24-bit audio data
0
SPKVDD/3.3 1.05*SPKVD
AVDD/3.3
100
100
1.25
2.944
-80
-78
-30.6
-98
+60
-80
-78
98
96
98
50
98
TYP
0.03
0.02
0.3
0.7
40
-72
68
6
0
6
PD, Rev 4.0, August 2008
1.05*AVDD
D/3.3
+100
/3.3
-70
-68
1.50
7.94
1.94
+2.0
+2.0
MAX
75
WM8941
Vp-p
dB
dB
dB
Deg
dB
mV
dBFS
dBFS
dBFS
dBFS
V
UNIT
dB
dB
dB
V
dB
dB
dB
%
dB
dB
rms
dB
dB
dB
rms
%
%
%
9