WM8940GEFL/RV データシートの表示（PDF） - Wolfson Microelectronics plc
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WM8940GEFL/RV Datasheet PDF : 85 Pages
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Pre-Production
WM8940
Digital to Analogue Converter (DAC) to MONO Output with 10kΩ / 50pF load and DACVOL 0dB
Full-scale output 1
DACVOL = 0dB
AVDD1/3.3
Signal to Noise Ratio 3
SNR
A-weighted
98
AVDD1=AVDD2=3.3V
Total Harmonic Distortion 4
THD
0dBFS input
-80
AVDD1=AVDD2=3.3V
Total Harmonic Distortion + Noise 5
THD+N
0dBFS input
-78
AVDD1=AVDD2=3.3V
Channel Separation 6
1kHz signal
100
MICP and MICN input PGA to input boost stage into 10kΩ / 50pF load on SPKOUTP and SPKOUTP
INPPGAVOL, PGABOOST = 0dB
Full-scale output voltage, 0dB gain
Signal to Noise Ratio 3
SNR
A-weighted
AVDD2/3.3
98
AVDD1=AVDD2=3.3V
Total Harmonic Distortion 4
THD
full-scale signal
-80
AVDD1=AVDD2=3.3V
Total Harmonic Distortion + Noise 5
THD+N
full-scale signal
-78
AVDD1=AVDD2=3.3V
Channel Separation 6
100
Speaker Output (SPKOUTP, SPKOUTN with 8Ω bridge tied load)
Vrms
dB
dBFS
dBFS
dB
Vrms
dB
dBFS
dBFS
dB
Output Power
Total Harmonic Distortion 4
Po
THD
Output power is closely correlated with THD see below
Po=150mW, RL = 8Ω
0.03
%
SPKVDD=3.3V
-68
dB
Po=350mW, RL = 8Ω
2.944
%
Signal to Noise Ratio 3
SNR
SPKVDD=3.3V
A-weighted
SPKVDD=3.3V
-30.6
dB
98
dB
Power Supply Rejection Ratio
PSRR
RL = 8Ω BTL
50
dB
(50Hz-22kHz)
Headphone Output (SPKOUTP, SPKOUTN with resistive load to GND)
Signal to Noise Ratio 3
SNR
A-weighted
98
dB
SPKVDD=3.3V
Total Harmonic Distortion 4
THD
Po=20mW, RL = 16Ω
0.02
%
SPKVDD=3.3V
-72
dB
Microphone Bias
Bias Voltage
MBVSEL=0
0.9*AVDD1
V
MBVSEL=1
0.65*AVDD1
V
Bias Current Source
Output Noise Voltage
for VMICBIAS within +/-3%
1kHz to 20kHz
3
Ma
15
nV/√Hz
Digital Input / Output
Input HIGH Level
VIH
0.7×
V
DBVDD
Input LOW Level
Output HIGH Level
VIL
0.3×DBVDD
V
VOH
IOL=1mA
0.9×
V
DBVDD
Output LOW Level
Input Capacitance
VOL
IOH-1mA
All digital pins
0.1xDBVDD
V
10
pF
w
Pre-Production, Rev 3.0, February 2007
9
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