WM8731 / WM8731L
Production Data
Test Conditions
AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, XTI/MCLK =
256fs unless otherwise stated.
Microphone Input to ADC @ 0dB Gain, fs = 48kHz (40kΩ Source Impedance. See Figure 12)
Input Signal Level (0dB)
VINMIC
SNR
DR
1.0
AVDD/3.3
85
Vrms
dB
Signal to Noise Ratio
(Note 1,3)
A-weighted, 0dB gain
Dynamic Range (Note 3)
A-weighted, -60dB full
scale input
85
dB
Total Harmonic Distortion
THD
0dB input, 0dB gain
1kHz 100mVpp
-60
50
-55
dB
dB
dB
Power Supply Rejection Ratio
PSRR
20Hz to 20kHz
100mVpp
45
Programmable Gain Boost
MICBOOST bit
set
1kHz input
34
14
dB
dB
Rsource < 50Ω
MICBOOST = 0
Rsource < 50Ω
Mic Path gain (MICBOOST gain
is additional to this nominal
gain)
Mute attenuation
Input Resistance
Input Capacitance
Microphone Bias
Bias Voltage
0dB, 1kHz input
80
10k
10
dB
Ω
RINMIC
CINMIC
pF
VMICBIAS
0.75*AVDD – 0.75*AVDD 0.75*AVDD +
V
100mV
100mV
Bias Current Source
Output Noise Voltage
IMICBIAS
Vn
3
mA
1K to 20kHz
25
nV/√Hz
Line Output for DAC Playback Only (Load = 10kΩ. 50pF)
0dBfs Full scale output voltage
At LINE outputs
1.0 x
AVDD/3.3
100
Vrms
dB
Signal to Noise Ratio
(Note 1,3)
SNR
A-weighted,
@ fs = 48kHz
A-weighted
95
98
98
@ fs = 96kHz
A-weighted,
fs = 48kHz,
AVDD = 2.7V
Dynamic Range (Note 3)
Total Harmonic Distortion
DR
A-weighted, -60dB
full scale input
85
95
dB
dB
THD
1kHz, 0dBfs
1kHz, -3dBfs
1kHz 100mVpp
-88
-92
50
-80
Power Supply Rejection Ratio
PSRR
dB
20Hz to 20kHz
100mVpp
45
DAC channel separation
1kHz, 0dB
100
dB
Vrms
dB
Analogue Line Input to Line Output (Load = 10kΩ. 50pF, No Gain on Input ) Bypass Mode
0dB Full scale output voltage
1.0 x
AVDD/3.3
95
Signal to Noise Ratio
(Note 1,3)
SNR
THD
90
Total Harmonic Distortion
1kHz, 0dB
1kHz, -3dB
-86
-92
50
-80
dB
Power Supply Rejection Ratio
PSSR
1kHz 100mVpp
dB
20Hz to 20kHz
100mVpp
45
Mute attenuation
1kHz, 0dB
80
dB
PD, Rev 4.8, April 2009
w
8
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
