WM8731 Wolfson Microelectronics Ltd., WM8731 Datasheet - Page 10

• Manufacturer Part Number: WM8731
• Description: WM8731 : Low Power Audio Codec With Integrated Headphone Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8731
Test Conditions
AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, T
256fs unless otherwise stated.
PARAMETER
Microphone Input to ADC @ 0dB Gain, fs = 8kHz (40k ohm Source Impedance. See Figure 11)
Input Signal Level (0dB)
SNR (Note 1,3)
Dynamic Range (Note 3)
THD
Power Supply Rejection Ratio
Programmable Gain Boost
Mic Path gain (MICBOOST gain
is additional to this nominal
gain)
Mute attenuation
Input Resistance
Input Capacitance
Microphone Bias
Bias Voltage
Bias Current Source
Output Noise Voltage
Line Output for DAC Playback Only (Load = 10k ohms. 50pF)
0dBfs Full scale output voltage
SNR (Note 1,2,3)
SNR (Note 1,2,3)
SNR (Note 1,2,3)
Dynamic Range (Note 3)
THD
Power Supply Rejection Ratio
DAC channel separation
Analogue Line Input to Line Output (Load = 10k ohms. 50pF, No Gain on Input ) Bypass Mode
0dB Full scale output voltage
SNR (Note 1, 3)
THD
Power Supply Rejection Ratio
Mute attenuation
MICBOOST bit
SYMBOL
V
I
PSSR
PSSR
PSSR
R
C
V
MICBIAS
MICBIAS
DR
set
DR
INMIC
INMIC
Vn
INMIC
@ fs = 48kHz, AVDD
A-weighted, -60dB full
A-weighted, 0dB gain
Rsource < 50 Ohms
Rsource < 50 Ohms
0dB input, 0dB gain
A-weighted, -60dB
At LINE outputs
MICBOOST = 0
0dB, 1kHz input
full scale input
1kHz 100mVpp
@ fs = 48kHz
1kHz 100mVpp
1kHz 100mVpp
20Hz to 20kHz
@ fs = 96kHz
20Hz to 20kHz
20Hz to 20kHz
1kHz, -3dBfs
CONDITIONS
1kHz, 0dBfs
A-weighted,
A-weighted,
A-weighted
1K to 20kHz
1kHz, 0dB
1kHz, -3dB
scale input
1kHz input
1kHz, 0dB
100mVpp
100mVpp
100mVpp
= 2.7V
TEST
0.75*AVDD –
100mV
A
90
85
MIN
= +25
90
o
C, Slave Mode, fs = 48kHz, XTI/MCLK =
AVDD/3.3
AVDD/3.3
0.75*AVDD 0.75*AVDD +
AVDD/3.3
1.0 x
1.0 x
100
100
-88
-92
TYP
98
93
95
80
10k
1.0
-60
-86
-92
85
85
50
45
34
14
80
10
25
50
45
95
50
45
100mV
AI Rev 2.3 August 2001
MAX
-80
-55
-80
Advanced Information
3
nV/ Hz
Vrms
Ohms
Vrms
Vrms
UNIT
dB
dB
dB
dB
dB
dB
dB
dB
mA
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
pF
V
10