AD706
–80
1000
CLOSED-LOOP OUTPUT IMPEDANCE –
100
–100
CROSSTALK – dB
10
AV = –1000
–120
1
AV = + 1
0.1
–140
0.01
I
OUT
= +1mA
–160
10
0.001
100
1k
FREQUENCY – Hz
10k
100k
1
10
100
1k
FREQUENCY – Hz
10k
100k
Figure 20a. Crosstalk vs. Frequency
+V
S
0.1 F
Figure 21. Magnitude of Closed-Loop Output Impedance
vs. Frequency
R
F
+V
S
2
1/2
AD706
3
4
V
OUT
#1
1
20V p-p
0.1 F
R
L
2k
8
0.1 F
V
OUT
SINE WAVE
GENERATOR
–V
S
1/2
AD706
V
IN
4
R
L
2k
C
L
20k
+V
S
1 F
2.21k
6
8
0.1 F
V
OUT
#2
7
0.1 F
SQUARE
WAVE
INPUT
–V
S
1/2
AD706
5
Figure 22a. Unity Gain Follower (For Large Signal
Applications, Resistor R
F
Limits the Current
Through the Input Protection Diodes)
V
#2
CROSSTALK = 20 LOG
10 OUT
–20dB
V
OUT
#1
Figure 20b. Crosstalk Test Circuit
Figure 22b. Unity Gain Follower
Large Signal Pulse Response, R
F
=
10 k
Ω
, C
L
= 1,000 pF
Figure 22c. Unity Gain Follower
Small Signal Pulse Response, R
F
=
0
Ω
, C
L
= 100 pF
Figure 22d. Unity Gain Follower
Small Signal Pulse Response, R
F
=
0
Ω
, C
L
= 1000 pF
–6–
REV. C
AD [ ANALOG DEVICES ]
