WM8778
Production Data
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
AVDD, DACREFP
2.7
5.5
AGND, DGND,
DACREFN,
0
0
ADCREFGND
Difference DGND to AGND
-0.3
+0.3
V
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
I
OL=1mA
0.1 x DVDD
Output HIGH
IOH=1mA
0.9 x DVDD
Analogue Reference Levels
Reference voltage
VVMID
RVMID
AVDD/2
50k
V
Potential divider resistance
Ω
DAC Performance (Load = 10k Ω, 50pF)
0dBFs Full scale output voltage
1.0 x
AVDD/5
108
Vrms
dB
SNR (Note 1,2)
SNR (Note 1,2)
A-weighted,
@ fs = 48kHz
A-weighted
102
102
108
108
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
50
-90
dB
dB
dB
dB
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
20Hz to 20kHz
100mVpp
45
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
97
A-weighted, 0dB gain
@ fs = 96kHz
99
dB
64 x OSR
Dynamic Range (note 2)
A-weighted, -60dB
full scale input
102
dB
Total Harmonic Distortion (THD)
1kHz, 0dBFs
1kHz, -1dBFs
1kHz Input
-92
-95
90
dB
dB
dB
-85
ADC Channel Separation
PD Rev 4.0 April 2005
6
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
