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 2a. Crosstalk vs. Frequency
+V
S
0.1 F
Figure 3. Magnitude of Closed-Loop Output
Impedance vs. Frequency
2
1/2
AD706
3
4
V
OUT1
1
20V p-p
0.1 F
R
L
2k
8
+V
S
R
F
0.1 F
V
OUT
SINE WAVE
GENERATOR
–V
S
1/2
AD706
V
IN
4
R
L
2k
20k
+V
S
1 F
2.21k
6
8
0.1 F
V
OUT2
7
SQUARE
WAVE
INPUT
–V
S
0.1 F
C
L
1/2
AD706
5
Figure 4a. Unity Gain Follower (For large signal
applications, resistor R
F
limits the current
through the input protection diodes.)
CROSSTALK = 20 LOG
10
V
OUT2
V
OUT1
–20dB
Figure 2b. Crosstalk Test Circuit
Figure 4b. Unity Gain Follower Large
Signal Pulse Response, R
F
= 10 k
Ω
,
C
L
= 1,000 pF
Figure 4c. Unity Gain Follower
Small Signal Pulse Response,
R
F
= 0
Ω
, C
L
= 100 pF
Figure 4d. Unity Gain Follower
Small Signal Pulse Response,
R
F
= 0
Ω
, C
L
= 1000 pF
–6–
REV. E
AD [ ANALOG DEVICES ]
