WM8974 Просмотр технического описания (PDF) - Wolfson Microelectronics plc
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WM8974 Datasheet PDF : 63 Pages
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WM8974
Test Conditions
DCVDD = 1.62V, AVDD = DBVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital to Analogue Converter (DAC) to MONO output (all data measured with 10kΩ / 50pF load)
Signal to Noise Ratio (Note 5)
SNR
A-weighted
TBD
98
dB
Total Harmonic Distortion
THD
RL = 10 kΩ
-84
dB
(Note 7)
full-scale signal
0dB Full Scale output voltage
(Note 9)
MONOBOOST=0
MONOBOOST=1
AVDD/3.3
1.5x
(AVDD/3.3)
VRMS
Speaker Output PGA
Programmable Gain
-57
6
dB
Programmable Gain Step Size
Guaranteed monotonic
1
dB
BTL Speaker Output (SPKROUTP, SPKROUTN with 8Ω bridge tied load)
Output Power
Total Harmonic Distortion
PO
THD
Output power is very closely correlated with THD; see below
PO =180mW, RL = 8Ω,
0.3
%
SPKRVDD=3.3V
-50
dB
PO =400mW, RL = 8Ω,
1.0
%
SPKRVDD=3.3V
-40
dB
PO =360mW, RL = 8Ω,
0.3
%
SPKRVDD=5V
-50
dB
PO =800mW, RL = 8Ω,
1
%
SPKRVDD=5V
-40
dB
Signal to Noise Ratio
SNR
SPKRVDD=3.3V,
90
dB
RL = 8Ω
SPKRVDD=5V,
90
dB
Power Supply Rejection Ratio
RL = 8Ω
50
dB
‘Headphone’ output (SPKROUTP, SPKROUTN with resistive load to ground)
Signal to Noise Ratio
SNR
93
dB
Total Harmonic Distortion
THD
Po=20mW, RL = 16Ω,
0.008
%
SPKRVDD=3.3V
-81
dB
Po=20mW, RL = 32Ω,
0.007
%
SPKRVDD=3.3V
- 83
dB
Microphone Bias
Bias Voltage (MBVSEL=0)
Bias Voltage (MBVSEL=1)
Bias Current Source
Output Noise Voltage
VMICBIAS
VMICBIAS
IMICBIAS
Vn
1K to 20kHz
0.9*AVDD
0.75*AVDD
3
15
V
V
mA
nV/√Hz
Digital Input / Output
Input HIGH Level
Input LOW Level
Output HIGH Level
VIH
0.7×DVDD
VIL
VOH
IOL=1mA
0.9×DVDD
V
0.3×DVDD
V
V
Output LOW Level
VOL
IOH-1mA
0.1xDVDD
V
w
PP Rev 1.1 September 2004
7
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