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AD844JR Fiches technique(PDF) 9 Page - Analog Devices

No de pièce AD844JR
Description  60 MHz, 2000 V/us Monolithic Op Amp
Download  12 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD844JR Fiches technique(HTML) 9 Page - Analog Devices

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Response as a Noninverting Amplifier
Since current feedback amplifiers are asymmetrical with regard
to their two inputs, performance will differ markedly in nonin-
verting and inverting modes. In noninverting modes, the large
signal high speed behavior of the AD844 deteriorates at low
gains because the biasing circuitry for the input system (not
shown in Figure 28) is not designed to provide high input volt-
age slew rates.
However, good results can be obtained with some care. The
noninverting input will not tolerate a large transient input; it
must be kept below
±1 V for best results. Consequently this mode
is better suited to high gain applications (greater than
×10).
Figure 20 shows a noninverting amplifier with a gain of 10 and a
bandwidth of 30 MHz. The transient response is shown in Fig-
ures 23 and 24. To increase the bandwidth at higher gains, a ca-
pacitor can be added across R2 whose value is approximately the
ratio of R1 and R2 times Ct.
Figure 29. Noninverting Amplifier Gain = 100, Optional
Offset Trim Is Shown
Noninverting Gain of 100
The AD844 provides very clean pulse response at high nonin-
verting gains. Figure 29 shows a typical configuration providing
a gain of 100 with high input resistance. The feedback resistor is
kept as low as practicable to maximize bandwidth, and a peaking
capacitor (CPK) can optionally be added to further extend the
bandwidth. Figure 30 shows the small signal response with
CPK = 3 nF, RL = 500
Ω and supply voltages of either ±5 V or
±15 V. Gain bandwidth products of up to 900 MHz can be achieved
in this way.
The offset voltage of the AD844 is laser trimmed to the 50
µV
level and exhibits very low drift. In practice, there is an addi-
tional offset term due to the bias current at the inverting input
(IBN) which flows in the feedback resistor (R1). This can option-
ally be nulled by the trimming potentiometer shown in Figure 29.
Figure 30. AC Response for Gain = 100, Configuration
Shown in Figure 29
USING THE AD844
Board Layout
As with all high frequency circuits considerable care must be
used in the layout of the components surrounding the AD844.
A ground plane, to which the power supply decoupling capaci-
tors are connected by the shortest possible leads, is essential
to achieving clean pulse response. Even a continuous ground
plane will exhibit finite voltage drops between points on the
plane, and this must be kept in mind in selecting the grounding
points. Generally speaking, decoupling capacitors should be
taken to a point close to the load (or output connector) since
the load currents flow in these capacitors at high frequencies.
The +In and –In circuits (for example, a termination resistor
and Pin 3) must be taken to a common point on the ground
plane close to the amplifier package.
Use low impedance capacitors (AVX SR305C224KAA or
equivalent) of 0.22
µF wherever ac coupling is required. Include
either ferrite beads and/or a small series resistance (approxi-
mately 4.7
Ω) in each supply line.
Input Impedance
At low frequencies, negative feedback keeps the resistance at the
inverting input close to zero. As the frequency increases, the im-
pedance looking into this input will increase from near zero to
the open loop input resistance, due to bandwidth limitations,
making the input seem inductive. If it is desired to keep the in-
put impedance flatter, a series RC network can be inserted
across the input. The resistor is chosen so that the parallel sum
of it and R2 equals the desired termination resistance. The ca-
pacitance is set so that the pole determined by this RC network
is about half the bandwidth of the op amp. This network is not
important if the input resistor is much larger than the termina-
tion used, or if frequencies are relatively low. In some cases, the
small peaking that occurs without the network can be of use in
extending the –3 dB bandwidth.
Applying the AD844
REV. C
–9–


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