Benchmark DAC2 Series - Page 53

DAC2 Series Instruction Manual Rev C Page 53
A
udio Precision DAC2 - INTERFACE JITTER TOLERANCE - Distortion vs Jitter
3.456 kHz Test Tone at 0 dBFS, THD+N 22 to 22 kHz BW
DAC2 - JITTER TOLERANCE.at27
ColorSweep Trace Line Style Thick Data Axis Comment
1 1 Green Solid 4 Anlr.THD+N Ratio Left
1 2 Red Solid 4 Dio.Interface Jitter Right
DAC2 THD+N (22-22kHz) (Green Trace) vs. Interface Jitter (Red Trace)
Digital Input = 3.456 kHz Tone at 0 dBFS, Fs = 48 kHz
10m
20
20m
50m
100m
200m
500m
1
2
5
10
U
I
-110
+0
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
100 90k200 500 1k 2k 5k 10k 20k 50k
Hz
Graph Plot 14 - JITTER TOLERANCE
The Audio Engineering Society (AES) has created a jitter tolerance template for testing digital audio
devices. The red curve shows the AES jitter tolerance template. Induced jitter approaches 5 UI at
200 Hz, and is reduced to 0.125 UI above 8 kHz. The green trace shows the THD+N of the DAC2
while being driven with the jitter shown on the red curve. Over the entire range of the AES jitter
tolerance test, the THD+N performance of the DAC2 is unchanged. The DAC2 easily passes the
AES jitter tolerance test without any THD+N performance degradation.