AD9680 Datasheet, PDF (26/97 Pages) Analog Devices – Dual, 14-Bit, 1.25 GSPS, 1.2 V/2.5 V, Analog-to-Digital Converter

AD9680
Product
Overview
Online
Documentation
80
75
70
65
60
55
50
985.3
SFDR (6.5×)
SNR (6.5×)
1022.3 1110.3 1205.3 1315.3 1420.3
ANALOG INPUT FREQUENCY (MHz)
1510.3
Figure 67. SNR/SFDR vs. fIN; 1 GHz < fIN < 1.5 GHz;
Buffer Control 1 (0x018) = 6.5×
75
70
65
60
55
50
1510.3
SFDR (8.5×)
SNR (8.5×)
1600.3
1720.3
1810.3
1920.3
ANALOG INPUT FREQUENCY (MHz)
1950.3
Figure 68. SNR/SFDR vs. fIN; 1.5 GHz < fIN < 2 GHz;
Buffer Control 1 (0x018) = 8.5×
0
AIN1 AND AIN2 = –7dBFS
SFDR = 90dBFS
–20
IMD2 = 90dBFS
IMD3 = 91dBFS
BUFFER CURRENT = 3.0×
–40
–60
–80
–100
–120
0
82
164
246
328
410
FREQUENCY (MHz)
Figure 69. Two-Tone FFT; fIN1 = 184 MHz, fIN2 = 187 MHz
Design
Resources
Discussion
Sample
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Data Sheet
0
AIN1 AND AIN2 = –7dBFS
–20
SFDR = 87dBFS
IMD2 = 92dBFS
IMD3 = 87dBFS
–40
BUFFER CURRENT = 3.0×
–60
–80
–100
–120
0
82
164
246
328
410
FREQUENCY (MHz)
Figure 70. Two-Tone FFT; fIN1 = 338 MHz, fIN2 = 341 MHz
0
IMD3 (dBc)
–20
IMD3 (dBFS)
SFDR (dBc)
SFDR (dBFS)
–40
–60
–80
–100
–120
–87 –81 –75 –69 –63 –57 –51 –45 –39 –33 –27 –21 –15 –9
INPUT AMPLITUDE (dBFS)
Figure 71. Two-Tone SFDR/IMD3 vs. Input Amplitude (AIN) with
fIN1 = 184 MHz and fIN2 = 187 MHz
0
IMD3 (dBc)
–20
IMD3 (dBFS)
SFDR (dBc)
SFDR (dBFS)
–40
–60
–80
–100
–120
–87 –81 –75 –69 –63 –57 –51 –45 –39 –33 –27 –21 –15 –9
INPUT AMPLITUDE (dBFS)
Figure 72. Two-Tone IMD3/SFDR vs. Input Amplitude (AIN) with
fIN1 = 338 MHz and fIN2 = 341 MHz
Rev. C | Page 26 of 97