WM8721 / WM8721L
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, MCLK =
256fs unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Logic Levels (CMOS Levels)
Input LOW level
VIL
VIH
0.3 x DBVDD
0.1 x DBVDD
V
V
V
V
Input HIGH level
0.7 x DBVDD
0.9 x DBVDD
Output LOW
VOL
VOH
IOL = 1mA
Output HIGH
IOH= -1mA
Power On Reset Threshold (DCVDD)
DCVDD Threshold On -> Off
Hysteresis
Vth
VIH
VOL
0.9
0.3
0.6
V
V
V
DCVDD Threshold Off -> On
Analogue Reference Levels
Reference voltage (VMID)
Potential divider resistance
VVMID
RVMID
AVDD/2
50k
V
Ω
Line Output for DAC Playback Only (Load = 10k Ω. 50pF)
0dBfs Full scale output voltage
At LINE outputs
1.0 x
AVDD/3.3
100
Vrms
dB
Signal to Noise Ratio
(Note 1,2)
SNR
A-weighted,
@ fs = 48kHz
A-weighted
95
85
100
98
dB
@ fs = 96kHz
A-weighted,
@ fs = 48kHz,
AVDD = 2.7V
dB
Dynamic Range (Note 2)
Total Harmonic Distortion
DR
A-weighted, -60dB
full scale input
100
dB
THD
1kHz, 0dBfs
1kHz, -3dBfs
1kHz 100mVpp
-86
-90
50
-80
dB
dB
dB
dB
Power Supply Rejection Ratio
PSRR
20Hz to 20kHz
100mVpp
45
DAC channel separation
1kHz, 0dB
100
dB
Stereo Headphone Output
0dB Full scale output voltage
1.0 x
AVDD/3.3
30
Vrms
mW
dB
Max Output Power
PO
RL = 32Ω
RL = 16Ω
A-weighted
55
Signal to Noise Ratio
(Note 1,2)
SNR
THD
90
98
Total Harmonic Distortion
1kHz, RL = 32 Ω @ PO
= 10mW rms (-5dB)
0.056
-65
0.1
-60
1.0
-40
%
dB
1kHz, RL = 32 Ω @ PO
= 20mW rms (-2dB)
0.56
-45
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
50
dB
dB
20Hz to 20kHz
100mVpp
45
Programmable Gain
1kHz
1kHz
-73
6
1
6
dB
dB
dB
Programmable Gain Step Size
Mute attenuation
1kHz, 0dB
80
PD Rev 4.0 November 2004
6
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
