Pre-Production
WM8777
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDDDAC = 5V, AVDDADC=5V, DVDD = 3.3V, AGNDDAC = 0V, AGNDADC = 0, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK
= 256fs, ADC/DAC in Slave Mode unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Logic Levels ( CMOS Levels)
Input LOW level
VIL
VIH
0.3 X DVDD
V
V
Input HIGH level
0.7 X DVDD
Input Leakage Current
Input Capacitance
0.2
5
µA
pF
V
Output LOW
VOL
VOH
I
OL=1mA
OH-1mA
0.1 x DVDD
Output HIGH
I
0.9 x DVDD
V
Analogue Reference Levels
Reference voltage
VVMID (DAC)
VVMID (ADC)
RVMID (DAC)
VREFP/2
AVDDADC/2
50k
V
V
Ω
Potential divider resistance
VREFP to VMID and
VMID to VREFN
RVMID (ADC)
AVDDADC to VMID
and VMID to
50k
Ω
AGNDADC
DAC Performance (Load = 10k Ω, 50pF) to pins L/RSUMOP, CNTSOP, LFESOP, L/RSUROP, L/RAUXSOP
0dBFs Full scale output voltage
1.0 x
VREFP/5
108
Vrms
dB
SNR (Note 1,2)
A-weighted,
@ fs = 48kHz
A-weighted
100
100
SNR (Note 1,2)
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
-96
110
88
-90
dB
dB
dB
dB
dB
DAC Mute attenuation
1kHz Input, 0dB gain
1kHz 100mVpp
Power Supply Rejection Ratio
PSRR
50
20Hz to 20kHz
100mVpp
45
DAC Digital Volume
DAC Digital volume control
range
-127.5
0
dB
dB
DAC Digital volume step size
ADC Performance
0.5
Input Signal Level (0dB)
1.0 x
AVDDADC/5
102
Vrms
dB
SNR (Note 1,2)
SNR (Note 1,2)
A-weighted, 0dB gain
@ fs = 48kHz
96
96
A-weighted, 0dB gain
@ fs = 96kHz
100
102
dB
Dynamic Range (note 2)
A-weighted, -60dB
full scale input
dB
Total Harmonic Distortion (THD)
1kHz, 0dBFs
1kHz, -1dBFs
1kHz Input
-89
-94
85
dB
dB
dB
dB
dB
-87
ADC Channel Separation
Programmable Gain Step Size
0.5
Programmable Gain Range
(Analogue)
1kHz Input
1kHz Input
-21
+24
Programmable Gain Range
(Digital)
-103
-21.5
dB
dB
Mute Attenuation
1kHz Input, 0dB gain
82
PP Rev 3.0 January 2005
7
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
