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WM8904ECS/R 数据表(PDF) 15 Page - Wolfson Microelectronics plc

部件名 WM8904ECS/R
功能描述  Ultra Low Power CODEC for Portable Audio Applications
PDF  188 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8904ECS/R 数据表(HTML) 15 Page - Wolfson Microelectronics plc

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Pre-Production
WM8904
w
PP, Rev 3.3, September 2012
15
Differential Stereo Record from Analogue Microphones - IN1L+IN2L / IN1R+IN2R pins to ADC output
Test conditions:
L_MODE = R_MODE = 10b (Differential mic)
LIN_VOL = RIN_VOL = 00111b (+30dB)
Total signal path gain = +30dB
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Differential Mic Input Full Scale
Signal Level
IN1L-IN2L / IN1R-IN2R (for ADC
0dBFS output)
0.032
-30
0.089
Vrms
dBV
Vpk-pk
Input Resistance
Rin
100
120
k
Input Capacitance
Cin
10
pF
Signal to Noise Ratio
SNR
A-weighted
ADC_OSR128 = 0
ADC_128_OSR_TST
_MODE = 1
ADC_BIASx1P5 = 1
68
dB
A-weighted
Best performance
mode::
ADC_OSR128 = 1
ADC_128_OSR_TST
_MODE = 0
ADC_BIASx1P5 = 0
67
77
Total Harmonic Distortion + Noise
THD+N
-31dBV input
-75
-65
dB
Common Mode Rejection Ratio
CMRR
1kHz, 100mVpk-pk
60
dB
Channel Separation
1kHz signal, -31dBV
85
dB
10kHz signal, -31dBV
80
Channel Level Matching
1kHz signal, -31dBV
+/-1
dB
PSRR (Referred to Input)
PSRR
217Hz, 100mVpk-pk
50
dB
1kHz, 100mV pk-pk
50
PGA and Microphone Boost
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Minimum PGA gain setting
L_MODE/R_MODE= 00b or 01b
-1.55
dB
L_MODE/R_MODE= 10b
+12
Maximum PGA gain setting
L_MODE/R_MODE= 00b or 01b
+28.28
dB
L_MODE/R_MODE= 10b
+30
Single-ended to differential
conversion gain
L_MODE/R_MODE= 00b
+6
dB
PGA gain accuracy
L_MODE/R_MODE= 00b
Gain -1.5 to +6.7dB
-1
+1
dB
L_MODE/R_MODE= 00b
Gain +7.5 to +28.3dB
-1.5
+1.5
L_MODE/R_MODE= 1X
Gain +12 to +24dB
-1
+1
L_MODE/R_MODE= 1X
Gain +27 to +30dB
-1.5
+1.5
Mute attenuation
all modes of operation
100
dB
Equivalent input noise
L_MODE/R_MODE= 00b or 01b
30
214
µVrms
nV/√Hz



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