wm8595 Wolfson Microelectronics plc, wm8595 Datasheet - Page 10

• Manufacturer Part Number: wm8595
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

WM8595
TERMINOLOGY
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Signal-to-noise ratio (dBFS) – SNR is the difference in level between a reference full scale output signal and the
device output with no signal applied. This ratio is also called idle channel noise. (No Auto-zero or Automute function is
employed in achieving these results).
Dynamic range (dBFS) – DNR is a measure of the difference in level between the highest and lowest components of a
signal. Normally a THD measurement at -60dBFS. The measured signal is then corrected by adding 60dB to the
result, e.g. THD @ -60dBFS = -30dB, DNR = 90dB.
Total Harmonic Distortion (dBFS) – THD is the difference in level between a reference full scale output signal and the
first seven odd harmonics of the output signal. To calculate the ratio, the fundamental frequency of the output signal is
notched out and an RMS value of the next seven odd harmonics is calculated.
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.
All performance measurements carried out with 20kHz low pass filter, and where noted an A-weighted filter. Failure to
use such a filter will result in higher THD 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.
All minimum and maximum values are subject to change.
This resistance is selectable using VMID_SEL[1:0] – see Figure 47 for full details.
See p81 for details of extended input impedance configuration.
PD, Rev 4.1, April 2010
Production Data
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