WM8731SED_13 Datasheet, PDF (12/65 Pages) Wolfson Microelectronics plc – Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates

WM8731 / WM8731L
Production Data
Test Conditions
AVDD, HPVDD, DBVDD = 1.8V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, T_A = +25^oC, 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)
V_INMIC
1.0
AVDD/3.3
Vrms
Signal to Noise Ratio
SNR
A-weighted, 0dB gain
80
dB
(Note 1,3)
Dynamic Range (Note 3)
DR
A-weighted, -60dB full
70
dB
scale input
Total Harmonic Distortion
THD
0dB input, 0dB gain
-55
dB
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
50
dB
20Hz to 20kHz
45
dB
100mVpp
Programmable Gain Boost
MICBOOST bit
1kHz input
34
dB
set
Rsource < 50Ω
Mic Path gain (MICBOOST gain
MICBOOST = 0
14
dB
is additional to this nominal gain)
Rsource < 50Ω
Mute attenuation
0dB, 1kHz input
80
dB
Input Resistance
Input Capacitance
Microphone Bias
R_INMIC
C_INMIC
10k
Ω
10
pF
Bias Voltage
V_MICBIAS
0.75*AVDD – 0.75*AVDD 0.75*AVDD +
V
100mV
100mV
Bias Current Source
Output Noise Voltage
I_MICBIAS
Vn
1K to 20kHz
3
mA
25
nV/Hz
Line Output for DAC Playback Only (Load = 10k Ω. 50pF)
0dBfs Full scale output voltage
At LINE outputs
1.0 x
Vrms
AVDD/3.3
Signal to Noise Ratio
SNR
A-weighted,
85
95
dB
(Note 1,3)
@ fs = 48kHz
A-weighted
93
@ fs = 96kHz
Dynamic Range (Note 3)
DR
A-weighted, -60dB
85
90
dB
full scale input
Total Harmonic Distortion
THD
1kHz, 0dBfs
-80
-75
dB
1kHz, -3dBfs
-90
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
50
dB
20Hz to 20kHz
45
100mVpp
DAC channel separation
1kHz, 0dB
100
dB
Analogue Line Input to Line Output (Load = 10k Ω. 50pF, No Gain on Input ) Bypass Mode
0dB Full scale output voltage
1.0 x
Vrms
AVDD/3.3
Signal to Noise Ratio
SNR
85
90
dB
(Note 1,3)
Total Harmonic Distortion
THD
1kHz, 0dB
-83
-76
dB
1kHz, -3dB
-92
Power Supply Rejection Ratio
PSSR
1kHz 100mVpp
50
dB
20Hz to 20kHz
45
100mVpp
Mute attenuation
1kHz, 0dB
80
dB
w
PD, Rev 4.9, October 2012
12