AD6649 Analog Devices, AD6649 Datasheet - Page 13

• Manufacturer Part Number: AD6649
• Description: IF Diversity Receiver
• Manufacturer: Analog Devices

Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = 1.8 V, DRVDD = 1.8 V, sample rate = 250 MSPS, DCS enabled, 1.75 V p-p differential input, VIN = −1.0 dBFS, 32k sample,
T
and third harmonics is noted when they fall in the pass band of the filter. A −1.0 dBFS input level at the analog inputs corresponds to an
output level of −2.5 dBFS when using the fixed-frequency NCO and 95 MHz FIR filter. When using the tunable-frequency NCO and
100 MHz FIR filter, the output level is −1.3 dBFS. These respective output level reductions are due to FIR filter losses. See the FIR Filters
section for more details.
A
= 25°C, fixed-frequency NCO, 95 MHz BW FIR filter, unless otherwise noted. In the FFT plots that follow, the location of the second
–100
–120
–140
–100
–120
–140
–100
–120
–140
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
Figure 7. AD6649 Single-Tone FFT with f
Figure 5. AD6649 Single-Tone FFT with f
Figure 6. AD6649 Single-Tone FFT with f
0
0
0
f
f
SNR = 71.1dB (73.6dBFS)
SFDR = 85dBc (IN-BAND)
S
IN
f
f
SNR = 71.6dB (74.1dBFS)
SFDR = 87.5dBc (IN-BAND)
10
10
10
= 250MSPS
S
IN
= 140.1MHz @ –1.0dBFS
THIRD HARMONIC
= 250MSPS
= 90.1MHz @ –1.0dBFS
SECOND HARMONIC
20
20
20
30
30
30
SECOND HARMONIC
40
40
40
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
SECOND HARMONIC
50
50
50
THIRD HARMONIC
60
60
60
70
70
70
f
f
SNR = 72dB (74.5dBFS)
SFDR = 92dBc (IN-BAND)
S
IN
= 250MSPS
= 30.1MHz @ –1.0dBFS
80
80
80
THIRD HARMONIC
IN
IN
IN
90 100 110
90 100 110
90 100 110
= 140.1 MHz
= 30.1 MHz
= 90.1 MHz
120
120
120
Rev. A | Page 13 of 40
–100
–120
–140
–100
–120
–140
–100
–120
–140
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
Figure 10. AD6649 Single-Tone FFT with f
0
0
0
Figure 8. AD6649 Single-Tone FFT with f
Figure 9. AD6649 Single-Tone FFT with f
0
0
0
f
f
SNR = 70.5dB (73.0dBFS)
SFDR = 84.5dBc (IN-BAND)
S
IN
10
10
10
= 250MSPS
= 185.1MHz @ –1.0dBFS
THIRD HARMONIC
20
20
20
30
30
30
40
40
40
SECOND HARMONIC
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
50
50
50
60
60
60
f
f
SNR = 68.5dB (71.0dBFS)
SFDR = 83.5dBc (IN-BAND)
THIRD HARMONIC
S
IN
70
70
70
= 250MSPS
f
f
SNR = 69.8dB (72.3dBFS)
SFDR = 84dBc (IN-BAND)
THIRD HARMONIC
= 305.1MHz @ –1.0dBFS
S
IN
= 250MSPS
= 220.1MHz @ –1.0dBFS
80
80
80
SECOND HARMONIC
IN
IN
IN
90 100 110
90 100 110
90 100 110
= 185.1 MHz
= 220.1 MHz
= 305.1 MHz
AD6649
120
120
120