WM8955BL Wolfson Microelectronics, WM8955BL Datasheet - Page 7

• Manufacturer Part Number: WM8955BL
• Description: Stereo DAC
• Manufacturer: Wolfson Microelectronics

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Production Data
TERMINOLOGY
1.
2.
3.
4.
Test Conditions
DCVDD = 1.5V, AVDD = HPVDD = 3.3V, T
PARAMETER
Analogue Reference Levels
Midrail Reference Voltage
Buffered Reference Voltage
Digital Input / Output
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
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).
Dynamic range (dB) - DR 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).
THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
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.
SYMBOL
VREF
VMID
V
V
V
V
OH
OL
IH
IL
A
= +25
TEST CONDITIONS
o
C, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
I
I
OH
OL
= -1mA
= 1mA
0.7×DBVDD
0.9×DBVDD
MIN
–3%
–3%
AVDD/2
AVDD/2
TYP
PD Rev 4.1 February 2007
0.3×DBVDD
0.1×DBVDD
MAX
+3%
+3%
WM8955BL
UNIT
V
V
V
V
V
V
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