AD9621 Datasheet, PDF (5/6 Pages) Analog Devices – Wideband Voltage Feedback Amplifier

– ^{Typical Performance (R}L ^{= 100 Ω; A}V ^{= +1, unless otherwise noted) AD9621}
80
+90
+75
60
GAIN
+60
+45
40
+30
+15
20
PHASE
0
–15
0
–30
–45
–20
10k
100k
1M
10M
100M
FREQUENCY – Hz
–60
600M
Figure 4. Open-Loop Gain and
Phase
+2
+180
0
–2
A_V = –1
–4
–6
+135
+90
+45
0
–45
–90
–135
–180
A_V = –2
–8
50 100 150 200 250 300 350 400 450 500
FREQUENCY – MHz
Figure 5. Inverting Frequency
Response
+2
+180
+135
0
+90
+45
–2
0
A_V = 1
–45
–4
–90
–135
–6
A_V = 2
–180
A_V = 4
–8
50 100 150 200 250 300 350 400 450 500
FREQUENCY – MHz
Figure 6. Noninverting Frequency
Response
–50
22nnddHHAARRMMOONNICIC
–60 _{RRLL==110000ΩΩ}
–70
V_OUT = 2V _p-p
–80
2nd HARMONIC
–90 ^{RL = 500Ω}
–100
3rd HARMONIC
R_L = 100Ω
–110
3rd HARMONIC
R_L = 500Ω
–120
1
2
4 6 10
20
40 60
FREQUENCY – MHz
Figure 7. Harmonic Distortion
vs. Frequency
+2
0
–2
R_LOAD = 500Ω
–4
AV = 1
–6
R_F = 51Ω
R_LOAD = 50Ω
+180
+135
+90
+45
0
–45
–90
–135
–180
–8
50 100 150 200 250 300 350 400 450 500
FREQUENCY – MHz
Figure 10. Frequency Response
vs. R_LOAD
10
10
8
8
6
VOLTAGE
6
4
4
CURRENT
2
2
1
10²
10³
10⁴
10⁵
FREQUENCY – Hz
1
10⁶
Figure 13. Input Spectral Noise
Density
REV. 0
40
50
OUT
50
30
20
10
0
1
10
100
FREQUENCY – MHz
Figure 8. Third Order Intercept
+0.1
+0.08
+0.06
+0.04
+0.02
TEST CIRCUIT
100Ω
6pF
0
–0.02
–0.04
–0.06
V_OUT = 2V STEP
–0.08
–0.1
0
10
20
30
40
50
TIME – ns
Figure 11. Short-Term Settling
Time
27
4
VOLTAGE
23
3
CURRENT
19
2
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE – ±Volts
Figure 14. Output Level and
Supply Current vs. Supply Voltage
–5–
+20
+25
+30
+35
+40
+45
+50
CMRR
+55
+60
+65
PSRR
+70
1
10 100
1k 10k 100k 1M 10M 100M 1G
FREQUENCY – Hz
Figure 9. CMRR and PSRR vs.
Frequency
+0.1
+0.08
+0.06
V_OUT = 2V STEP
+0.04
+0.02
0
–0.02
–0.04
–0.06
–0.08
MEASURING
POINT
TEST CIRCUIT _+2V
0
100Ω
6pF
–0.1
1
10
100
1K
10K
100K
TIME – ns
Figure 12. Long-Term Settling Time
50
30
40
26
R_S
R_S
30
1k
C_L
22
51
20
18
t_SETTLING
10
14
0
10
1
10
100
C_LOAD – pF
Figure 15. Settling Time vs.
Capacitive Load