wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 17

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
TERMINOLOGY
1.
2.
3.
4.
w
Test Conditions
DCVDD = 1.8V, AVDD = HPVDD = 3.3V, T
PARAMETER
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
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
V
I
MICBIAS
SNR
MICBIAS
THD
F
V
V
V
V
V
V
V
V
Vn
REF
OH
OL
IH
IH
IH
IL
IL
IL
A
= +25
o
C, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
TEST CONDITIONS
full-scale signal
1kHz to 20kHz
5kHz signal
MBVSEL=0
MBVSEL=1
A-weighted
R
I
I
OL
L
OH
= 10kΩ
=1mA
-1mA
0.7×DBVDD
0.9×DBVDD
0.7xAVDD
0.032
MIN
-77
90
0.75*AVDD
HPVDD/3.3
0.9*AVDD
TYP
-83
97
80
24
40
40
3
0.3×DBVDD
0.1xDBVDD
0.3xAVDD
PD, June 2009, Rev 4.1
MAX
22
WM8351
nV/√Hz
Vrms
UNIT
MHz
mA
dB
dB
dB
dB
dB
V
V
V
V
V
V
V
V
17