Product Preview
Test Conditions
AVDD, VREFP = 5V, DVDD = 3.3V, AGND, VREFN = 0V, DGND = 0V, T
A
= +25
o
C, fs = 48kHz, MCLK = 256fs.
PARAMETER
Mute Attenuation
Power Supply Rejection Ratio
PSRR
SYMBOL
TEST CONDITIONS
1kHz Input, 0dB gain
1kHz 100mVpp
20Hz to 20kHz
100mVpp
Digital Logic Levels (CMOS Levels)
Input LOW level
Input HIGH level
Input leakage current
Input capacitance
Output LOW
Output HIGH
Analogue Reference Levels
Reference voltage
Potential divider resistance
Supply Current
Analogue supply current
Digital supply current
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.
AVDD, VREFP = 5V
DVDD = 3.3V
TBD
TBD
V
VMID
R
VMID
VREFP to VMID and
VMID to VREFN
VREFP/2 –
50mV
VREFP/2
50
VREFP/2 +
50mV
V
OL
V
OH
I
OL
=1mA
I
OH
= -1mA
0.9 x DVDD
V
IL
V
IH
0.7 x DVDD
±0.2
5
0.1 x DVDD
±1
0.3 x DVDD
MIN
TYP
90
50
45
MAX
WM8569
UNIT
dB
dB
dB
V
V
µA
pF
V
V
V
kΩ
mA
mA
All performance measurements done with 20kHz low pass filter, and where noted an A-weight filter. 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.
VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
3.
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. (No Auto-zero or Automute function is employed in achieving these results).
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 (dB) - THD is a ratio, of the rms values, of Distortion/Signal.
Stop band attenuation (dB) - Is the degree to which the frequency spectrum is attenuated (outside audio band).
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.
Pass-Band Ripple - Any variation of the frequency response in the pass-band region.
3.
4.
5.
6.
w
PP Rev 1.1 December 2005
7
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
