Analog Devices AD9865 Manual page 15

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