WM8770 Просмотр технического описания (PDF) - Wolfson Microelectronics plc
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WM8770 Datasheet PDF : 52 Pages
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Production Data
WM8770
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs, ADC/DAC in Slave Mode unless
otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Logic Levels (TTL Levels)
Input LOW level
VIL
0.8
V
Input HIGH level
VIH
Output LOW
VOL
Output HIGH
VOH
Analogue Reference Levels
IOL=1mA
IOH-1mA
2.0
0.9 x DVDD
V
0.1 x DVDD
V
V
Reference voltage
VVMID
AVDD/2
V
Potential divider resistance
RVMID
AVDD to VMID and
50k
Ω
VMID to AGND
DAC Performance (Load = 10kΩ, 50pF)
0dBFs Full scale output voltage
1.0 x
Vrms
AVDD/5
SNR (Note 1,2)
A-weighted,
100
106
dB
@ fs = 48kHz
SNR (Note 1,2)
A-weighted
106
dB
@ fs = 96kHz
Dynamic Range (Note 2)
DNR
A-weighted, -60dB
100
106
dB
full scale input
Total Harmonic Distortion (THD)
1kHz, 0dBFs
-94
-88
dB
DAC channel separation
110
dB
DAC analogue Volume Gain
Step Size
1
dB
DAC analogue Volume Gain
Range
1kHz Input
0 to -100
dB
Output Noise
A-weighted output
-116
dB
muted
DAC analogue Volume Mute
1kHz Input, 0dB gain
100
dB
Attenuation
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
50
dB
20Hz to 20kHz
45
dB
100mVpp
ADC Performance
Input Signal Level (0dB)
1.0 x
Vrms
AVDD/5
SNR (Note 1,2)
A-weighted, 0dB gain
102
dB
@ fs = 48kHz
SNR (Note 1,2)
A-weighted, 0dB gain
96
dB
@ fs = 96kHz
Dynamic Range (note 2)
A-weighted, -60dB
102
dB
full scale input
Total Harmonic Distortion (THD)
kHz, 0dBFs
-89
dB
1kHz, -1dBFs
-94
-90
dB
ADC Channel Separation
1kHz Input
85
dB
Programmable Gain Step Size
1.0
dB
Programmable Gain Range
1kHz Input
-12 to +19
dB
Mute Attenuation
1kHz Input, 0dB gain
82
dB
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
50
dB
20Hz to 20kHz
45
dB
100mVpp
w
PD Rev 4.1 June 2005
7
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