WM8904
Pre-Production
Single-ended Stereo Record from Analogue Microphones - IN2L / IN2R pins to ADC output
Test conditions:
L_MODE = R_MODE = 00b (Single ended)
LIN_VOL = RIN_VOL = 11111b (+28.3dB)
Total signal path gain = +34.3dB, incorporating 6dB single-ended to differential conversion gain
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
0.019
-34.3
0.055
12
MAX
UNIT
Vrms
dBV
Vpk-pk
k
Single-ended mic input full-scale
Signal Level (for ADC 0dBFS
output)
Input Resistance
Rin
Cin
9
Input Capacitance
Signal to Noise Ratio
10
pF
SNR
A-weighted
65
dB
ADC_OSR128 = 0
ADC_128_OSR_TST_
MODE = 1
ADC_BIASx1P5 = 1
A-weighted
73
Best performance
mode::
ADC_OSR128 = 1
ADC_128_OSR_TST_
MODE = 0
ADC_BIASx1P5 = 0
-35.3dBV input
Total Harmonic Distortion + Noise
Channel Level Matching
THD+N
PSRR
-69
+/-3
45
dB
dB
1kHz signal, -35.3dBV
217Hz, 100mVpk-pk
1kHz, 100mV pk-pk
Power Supply Rejection Ratio
dB
55
PP, Rev 3.3, September 2012
14
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
