Product Preview
WM8602
Test Conditions
AVDD, BVDD, DVDD = 2.7 to 3.3V, AGND, DGND, BGND = 0V, T
A
= -20 to +85
o
C, fs = 44.1kHz/48kHz, MCLK = 256fs unless
stated.
PARAMETER
PWM buffer drive strength
PWM pulse repetition rate
Notes:
1.
2.
Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’
weighted over a 20Hz to 20kHz bandwidth.
All performance measurements done with 20kHz AES17 low pass filter, except where noted an A-weight filter is used.
Failure to use such a filter will result in higher THD+N and lower SNR and Dynamic Range readings than are found in
the Electrical Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect
dynamic specification values.
The XIN input supports both a clock as well as a crystal input.
Parameter guaranteed by design.
Validated using the following filter
PARAMETER
Filter
Stopband
Note:
A third order differential RC filter has been used
-3dB
1.00
kHz
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SYMBOL
I
source
I
sink
f
PWM
TEST CONDITIONS
CMOS
20pF load
fs = 44.1kHz
fs = 48kHz
MIN
25
4
4
TYP
MAX
UNIT
mA
mA
25
352.8
384
kHz
kHz
3.
4.
5.
TERMINOLOGY
1.
2.
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.
Dynamic range (dB) - DNR 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.
3.
POWER CONSUMPTION
MODE DESCRIPTION
TYPICAL SUPPLY CURRENTS
[mA]
I
AVDD
AVDD, DVDD, BVDD = 3.3V
OFF
Standby
Mute
Stereo
2.1
Table 1 Supply Current Consumption
0
0.02
1.76
1.76
0
0.28
27.2
27.7
0
0
7.55
7.55
0
0.30
36.5
37.0
0
0.99
121
122
I
DVDD
I
BVDD
TOTAL CURRENT
[mA]
TOTAL POWER
[mW]
Notes:
1.
2.
T
A
= +25
o
C, Slave Mode, fs = 48kHz, MCLK = 27 kHz, 24-bit data
All figures are kHz 1kHz input sine wave @ 0dB.
w
PP Rev 1.5 May 2004
7
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
