ADA4817-1ACPZ-RL 查看數據表（PDF） - Analog Devices
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ADA4817-1ACPZ-RL Datasheet PDF : 28 Pages
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Data Sheet
HIGH SPEED JFET INPUT INSTRUMENTATION
AMPLIFIER
Figure 53 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
VOUT
= (VN
− VP )1 +
2RF
RG
(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)
ADA4817-1/ADA4817-2
Common-mode rejection of the in-amp is primarily determined by
the match of resistor ratios, R1:R2 to R3:R4. It can be estimated by
VO = (δ1 − δ2)
VCM (1 + δ1) δ2
(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
RS1
VN
0.1µF
ADA4817-2
U1
0.1µF
10µF
10µF
R2
350Ω
VCC
VEE
0.1µF
10µF
R1
350Ω
RF = 500Ω
RG
RF = 500Ω
VCC
0.1µF
R3
350Ω
10µF
R4
350Ω
ADA4817-1
0.1µF
VEE
VO
10µF
RS2
VP
ADA4817-2
U2
0.1µF
10µF
VEE
Figure 53. High Speed Instrumentation Amplifier
Rev. B | Page 21 of 28
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