
Data Sheet
AD8646/AD8647/AD8648
Rev. E | Page 13 of 20
4.0
0
–40
120
TEMPERATURE (°C)
S
UP
P
L
Y
CURRE
NT
P
E
R
AM
P
L
IF
IE
R
(m
A)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
–20
0
20406080
100
VOUT = VSY/2
VSY = 2.7V
VSY = 5V
06
52
7-
04
0
Figure 40. Supply Current per Amplifier vs. Temperature
06
52
7-
04
5
TIME (200ns/DIV)
V
O
LT
A
G
E
(
1V/
D
IV)
SHUTDOWN PIN
AMPLIFIER OUTPUT
VSY = 2.7V
RL = 1k
AV = 1
TA = 25°C
Figure 41. Turn-On Time
06
52
7
-04
6
TIME (200ns/DIV)
VO
LT
A
G
E
(
1V
/D
IV)
SHUTDOWN PIN
AMPLIFIER OUTPUT
VSY = 2.7V
RL = 1k
AV = 1
TA = 25°C
Figure 42. Turn-Off Time
0
–20
–40
–60
–80
–100
–120
1k
10k
100k
CHANN
E
L
S
E
P
A
RAT
IO
N
(
d
B)
FREQUENCY (Hz)
06
52
7-
0
42
VIN = 2V p-p
VIN = 0.5V p-p
VSY = 5V
RL = 2k
AV = –100
TA = 25°C
V–
V+
V–
V+
U2
R2
200
R1
20
6
7
5
V+
V–
V+
V–
0
+
–
VIN
R3
2k
U1
2
3
CS (dB) = 20 log (VOUT/100 = VIN)
Figure 43. Channel Separation
06
52
7-
0
43
TIME (200ns/DIV)
VOL
TA
G
E
(
1V/
D
IV)
SHUTDOWN PIN
AMPLIFIER OUTPUT
VSY = 5V
RL = 1k
AV = 1
TA = 25°C
Figure 44. Turn-On Time
06
52
7-
04
4
TIME (200ns/DIV)
VO
LT
A
G
E
(1
V/
D
IV
)
SHUTDOWN PIN
AMPLIFIER OUTPUT
VSY = 5V
RL = 1k
AV = 1
TA = 25°C
Figure 45. Turn-Off Time