WM8501
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD = 5V, DVDD = 3.3V, GND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Logic Levels (TTL Levels)
Input LOW level
VIL
VIH
0.8
V
V
Input HIGH level
2.0
Output LOW
VOL
VOH
I
OL = 2mA
DGND + 0.3V
V
V
Output HIGH
I
OH = 2mA
DVDD – 0.3V
Analogue Reference Levels
Reference voltage (VMID)
Potential divider resistance
AVDD/2
50
V
RCAP
AVDD to VMID and
VMID to GND
kΩ
DAC Output (Load = 10kΩ. 50pF)
0dBFs Full scale output voltage
At DAC outputs
1.6 x
AVDD/5
1.7 x
AVDD/5
100
1.8 x
AVDD/5
Vrms
dB
Signal to Noise Ratio (Note
5,6,7)
SNR
A-weighted,
@ fs = 48kHz
A-weighted
@ fs = 96kHz
A-weighted
90
97
97
dB
dB
@ fs = 192kHz
Dynamic Range (Note 2, 6)
DNR
THD
A-weighted, -60dB full
scale input
90
100
-88
dB
Total Harmonic Distortion
(Note 7)
1kHz, Load = 10kΩ,
-78
dB
0dBFS
DAC channel separation
Analogue Output Levels
Output level (line output)
93
dB
Load = 10kΩ, 0dBFS
1.7
Vrms
Minimum resistance load (line
output)
To midrail or a.c.
coupled
820
Ω
Output level (Headphone output)
Load = 16Ω, 0dBFS
To midrail or a.c.
coupled
1.0
16
Vrms
Minimum resistance load
(Headphone output)
Ω
Gain mismatch
channel-to-channel
±1
%FSR
V
Output d.c. level
AVDD/2
Supply Current
Analogue supply current
Digital supply current
AVDD = 5V
DVDD = 5V
9
8
mA
mA
mA
mA
DVDD = 3.3V
AVDD=DVDD=5V
4.5
0.01
Power down current (note 4)
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
over a 20Hz to 20kHz bandwidth.
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 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 pin decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
4. Power down occurs 1.5μs after MCLK is stopped.
5. 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).
PD, Rev 4.2, July 2009
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
