Benchmark DAC3 HGC - Page 62

Instruction Manual for DAC3 HGC and DAC3 L with 2.X Firmware Page 62
Graph 16 - Jitter Tolerance FFT
This figure shows a series of FFTs that were acquired while running the AES jitter tolerance test.
This is the ultimate jitter-immunity test.
Note that none of the 31 FFTs show any signs of jitter-induced sidebands. Note that the plots are
identical to the plots shown in Graph 3.
The DAC3 shows no change in performance when the AES jitter tolerance test is applied to the
digital inputs. No jitter-induced sidebands are visible anywhere in this measurement.
Please note that the 10 kHz fundamental needed to be notched out in order to make this very high-
resolution measurement. If the fundamental was not notched out, the spurious tones, produced by
the A/D converter in the AP2722 test set, would have obscured the virtually-perfect results.
Audio Precision
DAC3 - INTERFACE JITTER TOLERANCE FFT
10 kHz Test Tone at 0 dBFS, AES Jitter Tolerance Sweep
DAC3 - JITTER TOLERANCE FFT.at27
Color
Sweep Trace
Line Style
Thick Data Axis Comment Source 2
1 2 Blue Solid 1
Fft.Ch.1 Ampl
Left : 100.000 Hz=Dio.Jitter Freq
2
2 Cyan
Solid 1 Fft.Ch.1 Ampl Left : 125.893 Hz=Dio.Jitter Freq
3
2 Green Solid 1 Fft.Ch.1 Ampl Left
: 158.489 Hz=Dio.Jitter Freq
4 2 Yellow Solid 1 Fft.Ch.1 Ampl
Left : 199.526 Hz=Dio.Jitter Freq
5 2 Red
Solid 1 Fft.Ch.1 Ampl Left : 251.189 Hz=Dio.Jitter Freq
6 2
Magenta Solid 1
Fft.Ch.1 Ampl Left : 316.228 Hz=Dio.Jitter Freq
7 2 Blue Solid 1 Fft.Ch.1 Ampl Left : 398.107 Hz=Dio.Jitter Freq
8 2 Cyan Solid
1 Fft.Ch.1 Ampl Left : 501.187 Hz=Dio.Jitter Freq
9 2 Green Solid 1 Fft.Ch.1 Ampl Left : 630.957 Hz=Dio.Jitter Freq
10 2 Yellow Solid 1
Fft.Ch.1 Ampl Left : 794.328 Hz=Dio.Jitter Freq
11 2 Red Solid
1 Fft.Ch.1 Ampl Left : 1.00000 kHz=Dio.Jitter Freq
12 2 Magenta Solid 1 Fft.Ch.1 Ampl
Left : 1.25893 kHz=Dio.Jitter Freq
13 2 Blue Solid
1 Fft.Ch.1 Ampl Left : 1.58489 kHz=Dio.Jitter Freq
14 2 Cyan Solid
1 Fft.Ch.1 Ampl Left
: 1.99526 kHz=Dio.Jitter Freq
15 2 Green Solid 1 Fft.Ch.1 Ampl Left : 2.51189 kHz=Dio.Jitter Freq
16 2 Yellow Solid 1 Fft.Ch.1 Ampl
Left : 3.16228 kHz=Dio.Jitter Freq
17 2 Red Solid 1 Fft.Ch.1 Ampl Left : 3.98107 kHz=Dio.Jitter Freq
18 2 Magenta Solid 1 Fft.Ch.1 Ampl
Left : 5.01187 kHz=Dio.Jitter Freq
19 2 Blue Solid 1
Fft.Ch.1 Ampl Left : 6.30957 kHz=Dio.Jitter Freq
20 2 Cyan Solid 1 Fft.Ch.1 Ampl Left : 7.94328 kHz=Dio.Jitter Freq
21 2 Green Solid 1
Fft.Ch.1 Ampl Left : 10.0000 kHz=Dio.Jitter Freq
22 2 Yellow Solid 1 Fft.Ch.1 Ampl Left : 12.5893 kHz=Dio.Jitter Freq
23 2 Red Solid 1 Fft.Ch.1 Ampl Left : 15.8489 kHz=Dio.Jitter Freq
24 2 Magenta Solid 1 Fft.Ch.1 Ampl Left : 19.9526 kHz=Dio.Jitter Freq
25
2 Blue Solid 1 Fft.Ch.1 Ampl Left : 25.1189 kHz=Dio.Jitter Freq
26 2 Cyan Solid 1 Fft.Ch.1 Ampl
Left : 31.6228 kHz=Dio.Jitter Freq
27 2 Green Solid
1 Fft.Ch.1 Ampl Left : 39.8107 kHz=Dio.Jitter Freq
28 2 Yellow Solid 1 Fft.Ch.1 Ampl Left : 50.1187 kHz=Dio.Jitter Freq
29 2 Red Solid 1 Fft.Ch.1 Ampl Left : 63.0957 kHz=Dio.Jitter Freq
30
2 Magenta Solid 1 Fft.Ch.1 Ampl Left
: 79.4328 kHz=Dio.Jitter Freq
31 2 Blue Solid 1 Fft.Ch.1 Ampl Left : 100.000 kHz=Dio.Jitter Freq
-160
+0
-140
-120
-100
-80
-60
-40
-20
d
B
r
A
0 32k
2k 4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
24k
26k
28k
30k
Hz