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