WM8940CGEFL(2011) Ver la hoja de datos (PDF) - Wolfson Microelectronics plc
Número de pieza
componentes Descripción
Fabricante
WM8940CGEFL Datasheet PDF : 91 Pages
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WM8940
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD = 1.8V, AVDD = DBVDD = 3.3V, SPKVDD =3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise
stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Microphone Input PGA Inputs (MICN, MICP)
INPPGAVOL and PGABOOST = 0dB
Full-scale Input Signal Level – Single-
ended input via LIN/RIN 1
AVDD/3.3
Vrms
Full-scale Input Signal Level –
Pseudo-differential input 1,2
AVDD*0.7/
Vrms
3.3
Input PGA equivalent input noise
MICN input resistance
MICN input resistance
MICN input resistance
MICP input resistance
Input Capacitance
Maximum Input PGA Programmable
Gain
Minimum Input PGA Programmable
Gain
Programmable Gain Step Size
Input PGA Mute Attenuation
Input Gain Boost
Input Gain Boost
INPPGAVOL = +35.25dB
No input signal
0 to 20kHz
INPPGAVOL = +35.25dB
INPPGAVOL = 0dB
INPPGAVOL = -12dB
All gain settings
All analogue input pins
Gain adjusted by
INPPGAVOL
Gain adjusted by
INPPGAVOL
Guaranteed monotonic
INPPGAMUTE
PGABOOST= 0
PGABOOST = 1
+33.25
-14
76.5
2
58.5
97.5
124.5
10
+35.25
-12
0.75
92
0
+20
+37.25
-10
Auxiliary Analogue Inputs (AUX)
Full-scale Input Signal Level 2
AVDD/3.3
Input Resistance
Input Capacitance
Maximum Gain from AUX input PGA
mixers
Minimum Gain from AUX input PGA
mixers
AUX2BOOSTVOL step size
Input boost and mixer
20
enabled, at 0dB gain
All analogue Inputs
10
Gain adjusted by
+4.0
+6
+7.5
AUX2BOOSTVOL
Gain adjusted by
-14
-12
-9
AUX2BOOSTVOL
Guaranteed monotonic
3
Analogue to Digital Converter (ADC) - Input from MICN and MICP in differential configuration to input PGA
INPPGAVO, PGABOOST and ADCVOL = 0dB
Signal to Noise Ratio 3
SNR
A-weighted
88
91
AVDD=3.3V
Total Harmonic Distortion 4
THD
-1dBV Input
-80
-75
AVDD=3.3V
Total Harmonic Distortion + Noise 5
THD+N
-1dBV Input
-75
-68
AVDD=3.3V
Channel Separation 6
1kHz full scale input signal
100
dB
k
k
k
k
pF
dB
dB
dB
dB
dB
dB
Vrms
k
pF
dB
dB
dB
dB
dB
dB
dBFS
w
PD, Rev 4.3, November 2011
8
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