ADA4817-1ACPZ-R7 Analog Devices Inc, ADA4817-1ACPZ-R7 Datasheet - Page 20

• Manufacturer Part Number: ADA4817-1ACPZ-R7
• Description: Hi Speed FET Input Amp
• Manufacturer: Analog Devices Inc
• Series: FastFET™r

Specifications of ADA4817-1ACPZ-R7

• Amplifier Type: Voltage Feedback
• Number Of Circuits: 1
• Slew Rate: 870 V/µs
• Gain Bandwidth Product: 410MHz
• -3db Bandwidth: 1.05GHz
• Current - Input Bias: 2pA
• Voltage - Input Offset: 400µV
• Current - Supply: 19mA
• Current - Output / Channel: 40mA
• Voltage - Supply, Single/dual (±): 5 V ~ 10 V, ±2.5 V ~ 5 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADA4817-1ACPZ-R7TR

ADA4817-1/ADA4817-2
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
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
V
OUT
=
(
V
N
−
V
P
V
)
V
N
⎛
⎜
⎜
⎝
P
1
+
2
R
R
R
R
R
S1
S2
G
G
F
⎞
⎟
⎟
⎠
R
ADA4817-2
ADA4817-2
F
= 500Ω
U1
U2
R
V
V
V
V
F
CC
EE
EE
CC
= 500Ω
0.1µF
0.1µF
0.1µF
0.1µF
Figure 47. High Speed Instrumentation Amplifier
10µF
10µF
10µF
10µF
(16)
Rev. 0 | Page 20 of 24
350Ω
350Ω
R1
R3
350Ω
R4
approximated by:
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
The summing junction impedance for the preamps is equal
to R
bandwidth response like in the previous example.
ADA4817-1
F
In-amp
V
|| 0.5(R
V
CM
O
350Ω
V
V
R2
=
CC
EE
−3 dB
(
G
0.1µF
(
1
0.1µF
). Keep this value relatively low to improve the
δ
+
1
= (f
−
δ
1
δ
)
2
CR
δ
)
2
× R
10µF
10µF
G
)/(2 × R
F
)
V
O
(17)