AD9224 Analog Devices, AD9224 Datasheet - Page 20

• Manufacturer Part Number: AD9224
• Description: 12-Bit 40 MSPS Monolithic A/D Converter
• Manufacturer: Analog Devices

Specifications of AD9224

• Resolution (bits): 12bit
• # Chan: 1
• Sample Rate: 40MSPS
• Interface: Par
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref) p-p,2 V p-p,4 V p-p,Uni (Vref) x 2,Uni 2.0V,Uni 4.0V
• Adc Architecture: Pipelined
• Pkg Type: SOP

AD9224
The distortion and noise performance of an ADC at the given
IF frequency is of particular concern when evaluating an ADC
for a narrowband IF sampling application. Both single tone and
dual tone SFDR vs. amplitude are very useful in assessing an
ADC’s dynamic and static nonlinearities. SNR vs. amplitude
performance at the given IF is useful in assessing the ADC’s
noise performance and noise contribution due to aperture jitter.
In any application, one is advised to test several units of the
same device under the same conditions to evaluate the given
applications sensitivity to that particular device.
Figures 36–39 combine the dual tone SFDR as well as single
tone SFDR and SNR performances at IF frequencies of 35 MHz,
45 MHz, 71 MHz, and 85 MHz. Note, the SFDR vs. amplitude
data is referenced to dBFS while the single tone SNR data is
referenced to dBc. The performance characteristics in these
figures are representative of the AD9224 without any preceding
gain stage. The AD9224 was operated in the differential mode
(via transformer) with a 2 V span and a sample rate between
28 MSPS and 36 MSPS. The analog supply (AVDD) and the
digital supply (DRVDD) were set to +5 V and +3.3 V respectively.
Figure 36. IF Undersampling at 35 MHz (F
F
2
= 35.43 MHz, f
100
90
80
70
60
50
40
30
20
10
0
–0.5
–5
CLOCK
SNR-SINGLE
TONE (dBc)
= 28 MSPS)
–10
TONE (dBFS)
A
SFDR-DUAL
IN
–15
– dBFS
–20
SFDR-SINGLE
TONE (dBFS)
1
= 34.64 MHz,
–25
–30
–20–
Figure 37. IF Undersampling at 45 MHz (F
F
Figure 38. IF Undersampling at 70 MHz (F
F
Figure 39. IF Undersampling at 85 MHz (F
F
2
2
2
= 45.55 MHz, f
= 71.36 MHz, f
= 85.36 MHz, f
100
100
100
90
90
90
80
70
60
50
40
30
20
10
80
70
60
50
40
30
20
10
80
70
60
50
40
30
20
10
–0.5
0
–0.5
0
0
–0.5
SFDR-SINGLE
TONE (dBFS)
SNR-SINGLE
TONE (dBc)
SNR-SINGLE
TONE (dBc)
SNR-SINGLE
–5
–5
–5
TONE (dBc)
CLOCK
CLOCK
CLOCK
= 36 MSPS)
= 31.5 MSPS)
= 31 MSPS)
–10
–10
–10
TONE (dBFS)
SFDR-DUAL
TONE (dBFS)
A
A
A
SFDR-DUAL
IN
IN
IN
–15
–15
–15
– dBFS
– dBFS
– dBFS
TONE (dBFS)
SFDR-DUAL
–20
–20
–20
SFDR-SINGLE
TONE (dBFS)
SFDR-SINGLE
TONE (dBFS)
1
1
1
= 44.53 MHz,
–25
= 70.46 MHz,
–25
= 84.46 MHz,
–25
–30
–30
30
REV. A