WM8594_07 Wolfson Microelectronics Ltd., WM8594_07 Datasheet - Page 9

• Manufacturer Part Number: WM8594_07
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics Ltd.

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TERMINOLOGY
1.
2.
3.
4.
w
Test Conditions
AVDD2=9V, AVDD1=DVDD=3.3V, AGND1=AGND2=0V, DGND=0V, T
PARAMETER
Channel Separation
Channel Level Matching
Channel Phase Deviation
Headphone Amplifier
Output signal level (0dB)
Signal to Noise Ratio
Total Harmonic Distortion
Channel Separation
Power Supply Rejection Ratio
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.
4,5
4,5
1,5
SYMBOL
PSRR
SNR
THD
P
P
TEST CONDITIONS
O
O
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,
=20mW, R
=20mW, R
20kHz signal,
20kHz signal,
1kHz signal,
1kHz signal,
A-weighted
A
=+25˚C, 1kHz signal, fs=48kHz, MCLK=256fs unless otherwise stated
L
L
=16Ω
=32Ω
MIN
-73.5
0.05
TBD
-100
TBD
TYP
100
+30
+12
100
100
100
100
0.1
0.8
-97
0.5
0.5
0.5
+6
PP Rev 1.0 January 2007
MAX
WM8594
Degree
Vrms
UNIT
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
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