ADA4950-1 Datasheet, PDF (11/28 Pages) Analog Devices – Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3

0.5
V_{OUT, dm} = 100mV p-p
0.4
0.3
0.2
0.1
0
–0.1
–0.2
ADA4950-1, R_L = 1kΩ
ADA4950-1, R_L = 200Ω
–0.3
ADA4950-2, AMP 1, R_L = 1kΩ
ADA4950-2, AMP 1, R_L = 200Ω
–0.4
ADA4950-2, AMP 2, R_L = 1kΩ
ADA4950-2, AMP 2, R_L = 200Ω
–0.5
1
10
100
FREQUENCY (MHz)
1000
Figure 19. 0.1 dB Flatness, Small-Signal Frequency Response for Various
Loads
2
1 V_OCM (AC) = 100mV p-p
0
–1
V_OCM = –2.5VDC
–2
V_OCM = 0V
V_OCM = +2.5VDC
–3
–4
–5
–6
–7
–8
1
10
100
FREQUENCY (MHz)
1000
Figure 20. VOCM Small-Signal Frequency Response at Various DC Levels
–40
V_{OUT, dm} = 2V p-p
–50
–60
HD2, R_{L, dm} = 1kΩ
–70
HD3, R_{L, dm} = 1kΩ
HD2, R_{L, dm} = 200Ω
–80
HD3, R_{L, dm} = 200Ω
–90
–100
–110
–120
–130
–140
0.1
1
10
100
FREQUENCY (MHz)
Figure 21. Harmonic Distortion vs. Frequency at Various Loads
ADA4950-1/ADA4950-2
0.5
V_{OUT, dm} = 2V p-p
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
ADA4950-1, R_L = 1kΩ
ADA4950-1, R_L = 200Ω
ADA4950-2, AMP 1, R_L = 1kΩ
ADA4950-2, AMP 1, R_L = 200Ω
ADA4950-2, AMP 2, R_L = 1kΩ
ADA4950-2, AMP 2, R_L = 200Ω
–0.5
1
10
100
FREQUENCY (MHz)
1000
Figure 22. 0.1 dB Flatness, Large-Signal Frequency Response for Various Loads
2
V_OCM (AC) = 2V p-p
1
0
–1
V_OCM = –2.5VDC
–2
V_OCM = 0V
V_OCM = +2.5VDC
–3
–4
–5
–6
–7
–8
1
10
100
1000
FREQUENCY (MHz)
Figure 23. VOCM Large-Signal Frequency Response at Various DC Levels
–40
V_{OUT, dm} = 2V p-p
–50
–60
HD2, G = 1
HD3, G = 1
–70
HD2, G = 2
–80
HD3, G = 2
HD2, G = 3
–90
HD3, G = 3
–100
–110
–120
–130
–140
0.1
1
10
100
FREQUENCY (MHz)
Figure 24. Harmonic Distortion vs. Frequency at Various Gains
Rev. 0 | Page 11 of 28