WM8940GEFL/V Ver la hoja de datos (PDF) - Wolfson Microelectronics plc
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componentes Descripción
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WM8940GEFL/V Datasheet PDF : 85 Pages
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WM8940
Pre-Production
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
Input PGA Programmable Gain
Programmable Gain Step Size
Input PGA Mute Attenuation
Input Gain Boost
Input Gain Boost
Auxiliary Analogue Inputs (AUX)
Full-scale Input Signal Level 2
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
-12
INPPGAVOL
Guaranteed monotonic
INPPGAMUTE
PGABOOST= 0
PGABOOST = 1
76.5
1.6
47
71
94
10
0.75
108
0
+20
+35.25
AVDD/3.3
Input Resistance
Input boost and mixer
20
enabled, at 0dB gain
Input Capacitance
All analogue Inputs
10
Gain range from AUX input PGA
mixers
Gain adjusted by
-12
+6
AUX2BOOSTVOL
AUXLBOOSTVOL and
3
AUXRBOOSTVOL step size
Analogue to Digital Converter (ADC) - Input from MICN and MICN in differential configuration to input PGA
INPPGAVO, PGABOOST and ADCVOL = 0dB
Signal to Noise Ratio 3
SNR
A-weighted
91
AVDD=3.3V
Total Harmonic Distortion 4
THD
-1dBV Input
-83
AVDD=3.3V
Total Harmonic Distortion + Noise 5
THD+N
-1dBV Input
-77
Channel Separation 6
AVDD=3.3V
1kHz full scale input signal
100
dB
kΩ
kΩ
kΩ
kΩ
pF
dB
dB
dB
dB
dB
Vrms
kΩ
pF
dB
dB
dB
dB
dB
dBFS
w
Pre-Production, Rev 3.0, February 2007
8
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