Production Data
WM8716
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS
AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DAC Circuit Specifications
SNR (See Notes 1 and 2)
THD (full-scale)
105
112
-92
-97
112
dB
dB
dB
dB
0dB FS
-1dB FS
(See Note 2)
Dynamic range
(See Note 2)
THD @ -60dB FS
105
Filter Characteristics (Sharp Roll-off)
Passband
±0.0012 dB
0.4535fs
dB
Stopband
-3dB
0.491fs
30/fs
Passband ripple
±0.0012
±0.001
dB
dB
s
Stopband Attenuation
Delay time
f > 0.5465fs
-82
Filter Characteristics (Slow Roll-off)
Passband
±0.001dB
0.274fs
0.459fs
Stopband
-3dB
Passband ripple
dB
dB
s
Stopband Attenuation
Delay time
f > 0.732fs
-82
9/fs
Internal Analogue Filter
Bandwidth
-3dB
195
kHz
dB
Passband edge response
Digital Logic Levels
20kHz
-0.043
Input LOW level
Input HIGH level
(See Note 3)
VIL
VIH
0.8
2.0
V
V
Output LOW level
Output HIGH level
VOL
VOH
IOL = 2mA
IOH = 2mA
AVSS + 0.3V
AVDD - 0.3V
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.
WOLFSON MICROELECTRONICS LTD
PD Rev 3.1 April 2001
3
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
