wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 17

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
TERMINOLOGY
w
Test Conditions
DCVDD = 1.8V, AVDD = HPVDD = 3.3V, T
PARAMETER
Headphone Output (OUT1L, OUT1R, OUT2L, OUT2R)
0dB full scale output voltage
Signal to Noise Ratio
Total Harmonic Distortion
(Note 3)
OUT3/OUT4 outputs (with 10kΩ / 50pF load)
Full-scale output
Signal to Noise Ratio (Note 1, 2)
Total Harmonic Distortion
(Note 3)
Channel Separation (Note 4)
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
Frequency Locked Loop (FLL)
Reference clock frequency
Jack Detect
Detection switch threshold
HPCOM
Ground noise rejection
1.
2.
3.
4.
Signal-to-noise ratio (dB) = SNR is a measure of the difference in level between the full scale output and the output with
no signal applied. (No Auto-zero or Automute function is employed in achieving these results).
Dynamic range (dB) = DR is a measure of the difference between the highest and lowest portions of a signal. Normally a
THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB to it. (E.g.
THD+N @ -60dB= -32dB, DR= 92dB).
THD+N (dB) = THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
Channel Separation (dB) = Also known as Cross-Talk. This is a measure of the amount one channel is isolated from the
other. Normally measured by sending a full scale signal down one channel and measuring the other.
SYMBOL
THD+N
V
I
MICBIAS
SNR
SNR
THD
MICBIAS
F
V
V
V
V
V
Vn
V
V
V
REF
OH
OL
IH
IH
IH
IL
IL
IL
A
= +25
R
R
TEST CONDITIONS
o
C, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
L
L
= 16Ω, Po=20mW
= 32Ω, Po=20mW
full-scale signal
1kHz to 20kHz
HPVDD=3.3V
HPVDD=3.3V
5KHz signal
MBVSEL=0
MBVSEL=1
A-weighted
A-weighted
R
I
I
OL
L
OH
= 10kΩ
=1mA
-1mA
0.7×DBVDD
0.9×DBVDD
0.7xAVDD
0.032
MIN
-65
-77
87
90
HPVDD/3.3
0.75*AVDD
HPVDD/3.3
0.9*AVDD
TYP
-72
-71
-83
96
97
80
24
40
40
3
0.3×DBVDD
0.1xDBVDD
0.3xAVDD
PD, June 2009, Rev 4.1
MAX
22
WM8350
nV/√Hz
V rms
UNIT
Vrms
MHz
mA
dB
dB
dB
dB
dB
dB
dB
dB
V
V
V
V
V
V
V
V
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