Production Data
WM8569
Test Conditions
AVDD, VREFP = 5V, DVDD = 3.3V, AGND, VREFN = 0V, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs.
PARAMETER
SYMBOL
TEST CONDITIONS
1kHz Input, 0dB gain
1kHz 100mVpp
MIN
TYP
90
MAX
UNIT
dB
Mute Attenuation
Power Supply Rejection Ratio
PSRR
50
dB
20Hz to 20kHz
100mVpp
45
dB
Digital Logic Levels (CMOS Levels)
Input LOW level
VIL
VIH
0.3 x DVDD
1
V
V
Input HIGH level
0.7 x DVDD
0.9 x DVDD
Input leakage current
Input capacitance
0.2
5
µA
pF
V
Output LOW
VOL
VOH
I
OL=1mA
0.1 x DVDD
Output HIGH
I
OH= -1mA
V
Analogue Reference Levels
Reference voltage
VVMID
RVMID
VREFP/2 –
50mV
VREFP/2
50
VREFP/2 +
50mV
V
Potential divider resistance
VREFP to VMID and
VMID to VREFN
kΩ
Supply Current
Analogue supply current
Digital supply current
AVDD, VREFP = 5V
DVDD = 3.3V
TBD
TBD
mA
mA
Notes:
1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’
weighted.
2. 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.
3. VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
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) - 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).
3. THD (dB) - THD is a ratio, of the rms values, of Distortion/Signal.
4. Stop band attenuation (dB) - Is the degree to which the frequency spectrum is attenuated (outside audio band).
5. 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.
6. Pass-Band Ripple - Any variation of the frequency response in the pass-band region.
PD Rev 4.0 June 2006
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7
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
