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