wm8594seft-v Wolfson Microelectronics plc, wm8594seft-v Datasheet - Page 10

• Manufacturer Part Number: wm8594seft-v
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

WM8594
TERMINOLOGY
1.
2.
3.
4.
5.
w
Test Conditions
AVDD2=9V, AVDD1=DVDD=3.3V, AGND1=AGND2=0V, DGND=0V, TA=+25˚C, 1kHz signal, fs=48kHz, MCLK=256fs unless otherwise stated
PARAMETER
Digital Volume Control
ADC minimum digital volume
ADC maximum digital volume
ADC volume step size
DAC minimum digital volume
DAC maximum digital volume
DAC volume step size
Analogue Volume Control
Minimum gain
Maximum gain
Step size
Mute attenuation
Crosstalk
DAC to ADC
ADC to DAC
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.
SYMBOL
TEST CONDITIONS
DAC fs=44.1kHz
DAC fs=44.1kHz
DAC fs=44.1kHz
DAC fs=44.1kHz
ADC fs=48kHz,
ADC fs=48kHz,
ADC fs=48kHz,
ADC fs=48kHz,
20kHz signal,
20kHz signal,
1kHz signal,
1kHz signal,
MIN
-73.5
-100
TYP
+30
+12
120
100
100
100
100
-97
0.5
0.5
0.5
+6
PD Rev 4.1 July 2008
MAX
Production Data
UNIT
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
10