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WM8770SIFT Datasheet(PDF) 8 Page - Wolfson Microelectronics plc

Part # WM8770SIFT
Description  24-bit, 192kHz 8-Channel Codec with Volume Control
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8770SIFT Datasheet(HTML) 8 Page - Wolfson Microelectronics plc

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WM8770
Production Data
w
PD Rev 4.1 June 2005
8
Test Conditions
AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, TA = +25
oC, fs = 48kHz, MCLK = 256fs, ADC/DAC in Slave Mode unless
otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Analogue input (AIN) to Analogue output (VOUT) (Load=10kΩ, 50pF, gain = 0dB) Bypass Mode
0dB Full scale output voltage
1.0 x
AVDD/5
Vrms
SNR (Note 1)
104
dB
1kHz, 0dB
-90
dB
THD
1kHz, -3dB
-95
dB
1kHz 100mVpp
50
dB
Power Supply Rejection Ratio
PSRR
20Hz to 20kHz
100mVpp
45
dB
Mute Attenuation
1kHz, 0dB
100
dB
Supply Current
Analogue supply current
AVDD = 5V
120
mA
Digital supply current
DVDD = 3.3V
16
mA
Notes:
1.
Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’
weighted.
2.
All performance measurements done with 20kHz low pass filter, and where noted an A-weight filter. Failure to use
such a filter will result in higher THD+N and lower SNR and Dynamic Range readings than are found in the Electrical
Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic
specification values.
3.
VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
TERMINOLOGY
1.
Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output
with no signal applied. (No Auto-zero or Automute function is employed in achieving these results).
2.
Dynamic range (dB) - DNR is a measure of the difference between the highest and lowest portions of a signal.
Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB
to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB).
3.
THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
4.
Stop band attenuation (dB) - Is the degree to which the frequency spectrum is attenuated (outside audio band).
5.
Channel Separation (dB) - Also known as Cross-Talk. This is a measure of the amount one channel is isolated from
the other. Normally measured by sending a full scale signal down one channel and measuring the other.
6.
Pass-Band Ripple - Any variation of the frequency response in the pass-band region.


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