WM8776
Product Preview
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
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
Headphone Buffer
Maximum Output voltage
Max Output Power (Note 4)
0.9
25
50
92
1
Vrms
mW
mW
dB
Po
RL = 32 Ω
RL = 16 Ω
A-weighted
SNR (Note 1,2)
85
Headphone analogue Volume
Gain Step Size
0.5
1.5
+6
dB
Headphone analogue Volume
Gain Range
1kHz Input
-73
dB
dB
Headphone analogue Volume
Mute Attenuation
1kHz Input, 0dB gain
100
Total Harmonic Distortion
+Noise
THD+N
PSRR
1kHz, RL = 32Ω @ Po =
-80
0.01
-77
-60
0.1
-40
1.0
dB
%
10mW rms
1kHz, RL = 32Ω @ Po =
dB
%
20mW rms
0.014
-40
Power Supply Rejection Ratio
20Hz to 20kHz, without
supply decoupling
dB
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
A-weighted, 0dB gain
@ fs = 96kHz
100
dB
64 x OSR
Dynamic Range (note 2)
A-weighted, -60dB
full scale input
102
-90
dB
Total Harmonic Distortion (THD)
1kHz, 0dBFs
-80
DB
PP Rev 1.91 June 2004
6
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
