ADA4817-1ACPZ-R2 Analog Devices Inc, ADA4817-1ACPZ-R2 Datasheet - Page 20
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ADA4817-1ACPZ-R2
Manufacturer Part Number
ADA4817-1ACPZ-R2
Description
IC OPAMP VF 410MHZ LN 8LFCSP
Manufacturer
Analog Devices Inc
Series
FastFET™r
Specifications of ADA4817-1ACPZ-R2
Slew Rate
870 V/µs
Amplifier Type
Voltage Feedback
Number Of Circuits
1
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
Op Amp Type
Low Noise
No. Of Amplifiers
1
Bandwidth
1.05GHz
Supply Voltage Range
5V To 10V
Amplifier Case Style
LFCSP
No. Of Pins
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
ADA4817-1/ADA4817-2
The pole in the loop transmission translates to a zero in the
noise gain of the amplifier, leading to an amplification of the
input voltage noise over frequency.
Table 9. RMS Noise Contributions of Photodiode Preamp
Contributor
R
VEN Amp
IEN Amp
F
45
40
35
30
25
20
15
10
–5
5
0
0.1
Figure 52. Photodiode Preamp Frequency Response
G = 63V/V
R
V
V
L
S
OUT
= 100Ω
= 10V
= 6V p-p
Expression
VEN
IEN
1
4
kT
×
×
R
FREQUENCY (MHz)
×
C
F
R
S
×
F
+
×
C
f
10
2
f
M
2
×
C
×
+
. 1
F
. 1
C
57
57
D
+
C
100
F
×
f
3
×
. 1
1000
57
Rev. A | Page 20 of 28
The loop transmission zero introduced by C
amplification. The noise gain bandwidth extends past the pre-
amp signal bandwidth and is eventually rolled off by the decreasing
loop gain of the amplifier. The current equivalent noise from the
inverting terminal is typically negligible for most applications.
The innovative architecture used in the ADA4817-1/ADA4817-2
makes balancing both inputs unnecessary, as opposed to traditional
FET input amplifiers. Therefore, minimizing the impedance
seen from the noninverting terminal to ground at all frequencies
is critical for optimal noise performance.
Integrating the square of the output voltage noise spectral density
over frequency and then taking the square root allows users
to obtain the total rms output noise of the preamp. Table 9
summarizes approximations for the amplifier and feedback
and source resistances. Noise components for an example
preamp with R
(bandwidth of about 6.4 MHz) are also listed.
RMS Noise with R
94 μV
777.5 μV
0.4 μV
783 μV (total)
F
= 50 kΩ, C
F
= 50 kΩ, C
S
= 30 pF, and C
S
= 30 pF, C
F
F
= 0.5 pF
limits the
F
= 0.5 pF