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AD8065ART-R2 数据表(PDF) 24 Page - Analog Devices

部件名 AD8065ART-R2
功能描述  High Performance, 145 MHz FastFET??Op Amps
PDF  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8065ART-R2 数据表(HTML) 24 Page - Analog Devices

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AD8065/AD8066
Rev. E | Page 24 of 28
VCC
VEE
1/2
AD8066
4.7
µF
0.1
µF
RS1
4.7
µF
0.1
µF
VN
2.2pF
500
Ω
R2
VP
1/2
AD8066
4.7
µF
0.1
µ F
4.7
µF
0.1
µ F
AD8065
4.7
µF
0.1
µF
4.7
µ F
0.1
µ F
VO
RG
VCC
VEE
VCC
VEE
500
Ω
R4
RS2
500
Ω
R1
500
Ω
R3
RF = 500Ω
2.2pF
RF = 500Ω
Figure 60. High Speed Instrumentation Amplifier
HIGH SPEED JFET INPUT INSTRUMENTATION
AMPLIFIER
Figure 60 shows an example of a high speed instrumentation
amplifier with high input impedance using the
AD8065/AD8066. The dc transfer function is
()
⎟
⎠
⎞
⎜
⎝
⎛ +
−
=
G
P
N
OUT
R
V
V
V
1000
1
For G = +1, it is recommended that the feedback resistors for
the two preamps be set to a low value (for instance 50 Ω for 50
Ω source impedance). The bandwidth for G = +1 will be 50
MHz. For higher gains, the bandwidth will be set by the preamp,
equaling
(
) (
)
F
G
CR
3dB
R
R
f
Inamp
×
×
=
−
2
/
Common-mode rejection of the inamp will be primarily
determined by the match of the resistor ratios R1:R2 to R3:R4. It
can be estimated
()
() 2
1
1
2
1
δ
δ
+
δ
−
δ
=
CM
O
V
V
The summing junction impedance for the preamps is equal to
RF || 0.5(RG). This is the value to be used for matching purposes.
VIDEO BUFFER
The output current capability and speed of the AD8065 make it
useful as a video buffer, shown in Figure 61.
The G = +2 configuration compensates for the voltage division
of the signal due to the signal termination. This buffer
maintains 0.1 dB flatness for signals up to 7 MHz, from low
amplitudes up to 2 V p-p (Figure 7). Differential gain and phase
have been measured to be 0.02% and 0.028° at ±5 V supplies.
+VS
–VS
4.7
µ F
0.1
µ F
2.2pF
499
Ω
249
Ω
75
Ω
499
Ω
VI
AD8065
4.7
µ F
0.1
µ F
75
Ω
VO
+
–
+
–
Figure 61. Video Buffer



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