WM8774
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RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
2.7
TYP
MAX
3.6
UNIT
Digital supply range
Analogue supply range
Ground
DVDD
V
V
V
V
AVDD
2.7
5.5
AGND, DGND
0
0
Difference DGND to AGND
-0.3
+0.3
Note: Digital supply DVDD must never be more than 0.3V greater than AVDD.
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 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
V
V
Input HIGH level
2.0
Output LOW
VOL
VOH
0.1 x DVDD
IOL=1mA
IOH-1mA
Output HIGH
0.9 x DVDD
Analogue Reference Levels
Reference voltage
VVMID
AVDD/2 –
50mV
AVDD/2
50k
AVDD/2 +
50mV
V
Potential divider resistance
RVMID
AVDD to VMID and
VMID to AGND
40k
60k
Ohms
DAC Performance (Load = 10k ohms, 50pF)
0dBFs Full scale output voltage
1.0 x
AVDD/5
106
Vrms
dB
SNR (Note 1,2)
SNR (Note 1,2)
A-weighted,
@ fs = 48kHz
A-weighted
104
104
106
106
dB
@ fs = 96kHz
Dynamic Range (Note 2)
DNR
A-weighted, -60dB
full scale input
dB
Total Harmonic Distortion (THD)
DAC channel separation
1kHz, 0dBFs
-97
100
1
-90
dB
dB
dB
DAC analogue Volume Gain
Step Size
0.5
1.5
0
DAC analogue Volume Gain
Range
1kHz Input
1kHz Input, 0dB gain
1kHz 100mVpp
-100
dB
dB
DAC analogue Volume Mute
Attenuation
100
Power Supply Rejection Ratio
PSRR
50
45
dB
dB
20Hz to 20kHz
100mVpp
ADC Performance
Input Signal Level (0dB)
1.0 x
AVDD/5
102
Vrms
dB
SNR (Note 1,2)
SNR (Note 1,2)
A-weighted, 0dB gain
@ fs = 48kHz
93
A-weighted, 0dB gain
@ fs = 96kHz
98
dB
Dynamic Range (note 2)
A-weighted, -60dB
full scale input
102
dB
Total Harmonic Distortion (THD)
kHz, 0dBFs
-90
-95
-80
-85
DB
dB
1kHz, -3dBFs
PP Rev 1.0 June 2002
6
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
