WM8716_06 Datasheet, PDF (6/27 Pages) Wolfson Microelectronics plc – High Performance 24-bit, 192kHz Stereo DAC

WM8716
Production Data
Notes:
1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’
weighted over a 20Hz to 20kHz bandwidth.
2. All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher THD+N
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.
3. Except for Pin 12 (MODE8X) and Pin 17 (DIFFHW), where VIH = 2.6V min.
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.
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. (eg THD+N @ -60dB= -32dB, DR= 92dB).
3. THD+N (dB) is a ratio of the r.m.s. 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) 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.
LRCIN
BCKIN
DIN
t_BCH
t_BCL
t_LB
t_BCY
t_BL
t_DS
t_DH
Figure 1 Audio Data Input Timing
TEST CONDITIONS
AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25^oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL
Audio Data Input Timing Information
BCKIN pulse cycle time
tBCY
BCKIN pulse width high
tBCH
BCKIN pulse width low
tBCL
BCKIN rising edge
tBL
to LRCIN edge
LRCIN rising edge
tLB
to BCKIN rising edge
DIN setup time
tDS
DIN hold time
tDH
TEST CONDITIONS
MIN
TYP
100
50
50
30
30
30
30
MAX
UNIT
ns
ns
ns
ns
ns
ns
ns
w
PD Rev 4.1 September 2006
6