WM8756EFT Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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производитель

WM8756EFT

192kHz, Six Channel SACD™ Compatible Audio DAC

Wolfson Microelectronics plc 

WM8756

DIGITAL FILTER CHARACTERISTICS

PARAMETER

Passband

Stopband

Passband Ripple

Stopband Attenuation

SYMBOL

TEST CONDITIONS

±0.05 dB

-3dB

f > 0.555fs

Table 4 Digital Filter Characteristics – PCM operation

MIN

0.444fs

TYP

0.487fs

Advance Information

MAX

±0.05

-60

UNIT

dB

dB

dB

SACD FILTER CHARACTERISTICS

With 64fs DSD data where fs = 44.1ks/s.

RESPONSE

Pass band peak ripple

Attenuation at 20kHz

Attenuation at 50kHz

Attenuation at 100kHz

FILTER RESPONSE WITHOUT POST-

FILTER

0.017dB

-0.012dB

-2.3dB

-15.5dB

Table 5 Overall frequency response in SACD mode.

FILTER RESPONSE WITH 3RD ORDER

BUTTERWORTH POST-FILTER (-3dB AT 55KHZ)

0.017dB

-0.021dB

-3.9dB

-31dB

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.

AI Rev 1.3 October 2001

7

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