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AD9865 Datasheet(PDF) 16 Page - Analog Devices

Part # AD9865
Description  Broadband Modem Mixed-Signal Front End
PDF  49 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9865 Datasheet(HTML) 16 Page - Analog Devices

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Data Sheet
AD9865
Rev. B | Page 15 of 48
Rx PATH TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = CLKVDD = DVDD = DRVDD = 3.3 V, fOSCIN = fADC = 50 MSPS, low-pass filter disabled, RxPGA = 0 dB, AIN = −1 dBFS,
RIN = 50 Ω, half- or full-duplex interface, default power bias settings.
TIME (ns)
0
80
160
240
320
400
480
560
640
720
512
64
128
192
256
320
384
448
Figure 21. RxPGA Settling Time −12 dB to +48 dB Transition for DC Input
(fADC = 50 MSPS, LPF Disabled)
INPUT FREQUENCY (MHz)
0
5
10
15
20
25
30
35
40
45
50
0
–18
–15
–12
–9
–6
–3
3.3V
3.0V
3.6V
Figure 22. Rx Low-Pass Filter Amplitude Response vs. Supply
(fADC = 50 MSPS, f−3 dB = 33 MHz, RxPGA = 0 dB)
FREQUENCY (MHz)
0
5
10
15
20
25
30
35
140
60
70
80
90
100
110
120
130
TxDAC ISOLATION @ 0dB
IAMP ISOLATION @ 0dB
Figure 23. Rx to Tx Full-Duplex Isolation @ 0 RxPGA Setting
(Note: ATTEN @ RxPGA = x dB = ATTEN @ RxPGA = 0 dB − RxPGA Gain)
TIME (ns)
0
80
160
240
320
400
480
560
640
720
352
320
288
256
224
192
160
128
96
64
Figure 24. RxPGA Settling Time for 0 dB to +5 dB Transition for DC Input
(fADC = 50 MSPS, LPF Disabled)
INPUT FREQUENCY (MHz)
0
5
10
15
20
25
30
35
40
50
45
0
–20
–16
–18
–14
–12
–10
–8
–6
–2
–4
–6dB GAIN
0dB GAIN
+6dB GAIN
+18dB GAIN
+30dB GAIN
+42dB GAIN
Figure 25. Rx Low-Pass Filter Amplitude Response vs. RxPGA Gain
(LPF's f−3 dB = 33 MHz)
FREQUENCY (MHz)
5
105
95
85
75
65
55
45
35
25
15
420
320
10
0
1
2
3
4
5
6
7
8
9
330
340
350
360
370
380
390
400
410
RIN
CIN
Figure 26. Rx Input Impedance vs. Frequency



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