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ADA4817-2ACPZ-R2 数据表(PDF) 20 Page - Analog Devices

部件名 ADA4817-2ACPZ-R2
功能描述  Low Noise, 1 GHz FastFET Op Amps
PDF  24 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADA4817-2ACPZ-R2 数据表(HTML) 20 Page - Analog Devices

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ADA4817-1/ADA4817-2
Rev. 0 | Page 20 of 24
HIGH SPEED JFET INPUT INSTRUMENTATION
AMPLIFIER
Figure 47 shows an example of a high speed instrumentation
amplifier with a high input impedance using the ADA4817-1/
ADA4817-2. The dc transfer function is
()
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
−
=
G
F
P
N
OUT
R
R
V
V
V
2
1
(16)
For G = 1, it is recommended that the feedback resistors for the
two preamps be set to 0 Ω and the gain resistor be open. The
system bandwidth for G = 1 is 400 MHz. For gains higher than
2, the bandwidth is set by the preamp, and it can be
approximated by:
In-amp−3 dB = (fCR × RG)/(2 × RF)
Common-mode rejection of the in-amp is primarily deter-
mined by the match of resistor ratios, R1:R2 to R3:R4. It can
be estimated by
(
)
() 2
1
1
2
1
δ
δ
+
δ
−
δ
=
CM
O
V
V
(17)
The summing junction impedance for the preamps is equal
to RF || 0.5(RG). Keep this value relatively low to improve the
bandwidth response like in the previous example.
VCC
VEE
10µF
0.1µF
10µF
0.1µF
RS1
VN
R2
350Ω
VP
ADA4817-1
VO
RG
VCC
VEE
VCC
VEE
R4
350Ω
RS2
10µF
0.1µF
10µF
0.1µF
R1
350Ω
R3
350Ω
RF = 500Ω
RF = 500Ω
10µF
0.1µF
10µF
0.1µF
ADA4817-2
U1
ADA4817-2
U2
Figure 47. High Speed Instrumentation Amplifier



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