AD8066AR Analog Devices Inc, AD8066AR Datasheet - Page 24
![IC OPAMP VF R-R DUAL LN LP 8SOIC](/photos/5/66/56684/505-8-soic_sml.jpg)
AD8066AR
Manufacturer Part Number
AD8066AR
Description
IC OPAMP VF R-R DUAL LN LP 8SOIC
Manufacturer
Analog Devices Inc
Series
FastFET™r
Datasheet
1.AD8065ARTZ-REEL7.pdf
(28 pages)
Specifications of AD8066AR
Slew Rate
180 V/µs
Mounting Type
Surface Mount
Rohs Status
RoHS non-compliant
Design Resources
Precision, Bipolar Configuration for the AD5426/32/43 8-Bit to12-Bit DACs (CN0036) Precision, Bipolar, Configuration for AD5450/1/2/3 8-14bit Multiplying DACs (CN0053)
Amplifier Type
Voltage Feedback
Number Of Circuits
2
Output Type
Rail-to-Rail
-3db Bandwidth
145MHz
Current - Input Bias
3pA
Voltage - Input Offset
400µV
Current - Supply
6.6mA
Current - Output / Channel
30mA
Voltage - Supply, Single/dual (±)
5 V ~ 24 V, ±2.5 V ~ 12 V
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Op Amp Type
Voltage Feedback
No. Of Amplifiers
2
Bandwidth
115MHz
No. Of Pins
8
Single Supply Voltage Min (+v)
5V
Settling Time
55ns
Gain Bandwidth Product
-
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Part Number
Manufacturer
Quantity
Price
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AD8065/AD8066
INPUT-TO-OUTPUT COUPLING
To minimize capacitive coupling between the inputs and output,
the output signal traces should not be parallel with the inputs.
WIDEBAND PHOTODIODE PREAMP
Figure 58 shows an I/V converter with an electrical model of a
photodiode. The basic transfer function is
where I
parallel combination of R
The stable bandwidth attainable with this preamp is a function
of R
capacitance at the amplifier’s summing junction, including C
and the amplifier input capacitance. R
produce a pole in the amplifier’s loop transmission that can
result in peaking and instability. Adding C
loop transmission that compensates for the pole’s effect and
reduces the signal bandwidth. It can be shown that the signal
bandwidth resulting in a 45° phase margin (f
where f
resistor, and C
junction (amplifier + photodiode + board parasitics).
The value of C
F
, the gain bandwidth product of the amplifier, and the total
V
C
f
( )
OUT
F
45
CR
PHOTO
=
is the amplifier crossover frequency, R
=
=
2
is the output current of the photodiode, and the
I
π
1
2
PHOTO
S
F
π
+
×
is the total capacitance at the amplifier summing
that produces f
×
sC
R
C
R
f
F
S
CR
F
×
F
×
R
R
×
F
f
CR
F
C
I
PHOTO
F
S
and C
(45)
V
B
F
sets the signal bandwidth.
can be shown to be
F
and the total capacitance
C
F
S
creates a 0 in the
(45)
) is defined by
F
is the feedback
R
Figure 58. Wideband Photodiode Preamp
SH
= 10
11
C
Ω
F
+ C
Rev. J | Page 24 of 28
S
S
The frequency response in this case shows about 2 dB of
peaking and 15% overshoot. Doubling C
bandwidth in half results in a flat frequency response with
about 5% transient overshoot.
The preamp’s output noise over frequency is shown in Figure 59.
The pole in the loop transmission translates to a 0 in the
amplifier’s noise gain, leading to an amplification of the input
voltage noise over frequency. The loop transmission 0
introduced by C
bandwidth extends past the preamp signal bandwidth and is
eventually rolled off by the decreasing loop gain of the
amplifier. Keeping the input terminal impedances matched is
recommended to eliminate common-mode noise peaking
effects, which adds to the output noise.
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 5
summarizes approximations for the amplifier and feedback and
source resistances. Noise components for an example preamp
with R
1.6 MHz) are also listed.
R
F
VEN
F
f
1
= 50 kΩ, C
R
F
Figure 59. Photodiode Voltage Noise Contributions
C
NOISE
D
C
C
NOISE DUE TO AMPLIFIER
F
M
M
limits the amplification. The noise gain
f
f
f
f
2
1
2
3
S
C
R
=
=
=
F
= 15 pF, and C
F
2πR
(C
2π R
1
S
F
C
+ C
F
F
(C
FREQUENCY (Hz)
M
F
+ 2C
VEN (C
+ C
f
CR
1
S
D
+ C
+ C
F
M
+ C
F
F
+ 2C
) /C
= 2 pF (bandwidth of about
V
S
O
F
+ C
D
)
M
F
+ 2C
and cutting the
D
)/C
F
f
3