Production Data
WM8352
Test Conditions
DCVDD = 1.8V, AVDD = HPVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Headphone Output (OUT1L, OUT1R, OUT2L, OUT2R)
0dB full scale output voltage
HPVDD/3.3
Vrms
dB
Signal to Noise Ratio
Total Harmonic Distortion
(Note 3)
SNR
A-weighted
RL = 16Ω, Po=20mW
HPVDD=3.3V
87
96
THD+N
-65
-72
dB
RL = 32Ω, Po=20mW
HPVDD=3.3V
-71
dB
OUT3/OUT4 outputs (with 10kΩ / 50pF load)
Full-scale output
HPVDD/3.3
V rms
dB
Signal to Noise Ratio (Note 1, 2)
Total Harmonic Distortion
(Note 3)
SNR
THD
A-weighted
RL = 10kΩ
90
97
-77
-83
dB
full-scale signal
Channel Separation (Note 4)
Microphone Bias
5KHz signal
80
dB
Bias Voltage
VMICBIAS
MBVSEL=0
MBVSEL=1
0.9*AVDD
V
V
0.75*AVDD
Bias Current Source
Output Noise Voltage
Digital Input / Output
Input HIGH Level
IMICBIAS
Vn
3
mA
1kHz to 20kHz
24
nV/√Hz
VIH
VIL
0.7×DBVDD
0.9×DBVDD
V
V
V
V
Input LOW Level
0.3×DBVDD
0.1xDBVDD
22
Output HIGH Level
VOH
VOL
IOL=1mA
IOH-1mA
Output LOW Level
Frequency Locked Loop (FLL)
Reference clock frequency
Jack Detect
FREF
0.032
MHz
Detection switch threshold
VIH
VIL
0.7xAVDD
V
V
0.3xAVDD
HPCOM
Ground noise rejection
VIH
VIL
40
40
dB
dB
TERMINOLOGY
1. 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).
2. 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).
3. THD+N (dB) = THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
4. 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.
PD, February 2011, Rev 4.4
w
17
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
