
AD6655
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = 1.8 V, DVDD = 1.8 V, DRVDD = 1.8 V, sample rate = 150 MSPS, DCS enabled, 1.0 V internal reference, 2 V p-p differential
input, VIN = 1.0 dBFS, 64k sample, T
A
= 25°C, NCO enabled, FIR filter enabled, unless otherwise noted. In the FFT plots that follow,
the location of the second and third harmonics is noted when they fall in the pass band of the filter.
Rev. 0 | Page 24 of 84
30
25
20
15
10
5
A
FREQUENCY (MHz)
0
–20
–40
–60
–80
–100
–120
–140
0
35
150MSPS
2.4MHz @ –1dBFS
SNR = 74.7dBc (75.7dBFS)
SFDR = 86.5dBc
f
NCO
= 18.75MHz
SECOND HARMONIC
THIRD HARMONIC
0
30
25
20
15
10
5
A
FREQUENCY (MHz)
Figure 19. AD6655-150 Single-Tone FFT with f
IN
= 2.4 MHz, f
NCO
= 18.75 MHz
0
–20
–40
–60
–80
–100
–120
–140
0
35
150MSPS
30.3MHz @ –1dBFS
SNR = 74.8dBc (75.8dBFS)
SFDR = 100dBc
f
NCO
= 24MHz
0
Figure 20. AD6655-150 Single-Tone FFT with f
IN
= 30.3 MHz, f
NCO
= 24 MHz
0
–20
–40
–60
–80
–100
–120
–140
0
35
0
0
–20
–40
–60
–80
–100
–120
–140
0
35
30
25
20
15
10
5
A
FREQUENCY (MHz)
150MSPS
140.1MHz @ –1dBFS
SNR = 73.7dBc (74.7dBFS)
SFDR = 82.8dBc
f
NCO
= 126MHz
SECOND HARMONIC
THIRD HARMONIC
0
0
–20
–40
–60
–80
–100
–120
–140
0
35
30
25
20
15
10
5
A
FREQUENCY (MHz)
30
25
20
15
10
5
A
FREQUENCY (MHz)
150MSPS
140.1MHz @ –1dBFS
SNR = 74.3dBc (75.3dBFS)
SFDR = 83.3dBc
f
NCO
= 56MHz
THIRD HARMONIC
Figure 21. AD6655-150 Single-Tone FFT with f
IN
= 70.1 MHz, f
NCO
= 56 MHz
Figure 22. AD6655-150 Single-Tone FFT with f
IN
= 140.1 MHz,
f
NCO
= 126 MHz
150MSPS
220.1MHz @ –1dBFS
SNR = 71.8dBc (72.8dBFS)
SFDR = 81.4dBc
f
NCO
= 205MHz
THIRD HARMONIC
0
0
–20
–40
–60
–80
–100
–120
–140
0
35
30
25
20
15
10
5
A
FREQUENCY (MHz)
Figure 23. AD6655-150 Single-Tone FFT with f
IN
= 220.1 MHz,
f
NCO
= 205 MHz
150MSPS
332.1MHz @ –1dBFS
SNR = 71.7dBc (72.7dBFS)
SFDR = 95.0dBc
f
NCO
= 321.5MHz
0
Figure 24. AD6655-150 Single-Tone FFT with f
IN
= 332.1 MHz,
f
NCO
= 321.5 MHz