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PDF 8964401PA Data sheet ( Hoja de datos )
| Número de pieza | 8964401PA | |
| Descripción | 2000 V/us Monolithic Op Amp | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
60 MHz, 2000 V/s
Monolithic Op Amp
AD844
FEATURES
Wide Bandwidth: 60 MHz at Gain of –1
Wide Bandwidth: 33 MHz at Gain of –10
Very High Output Slew Rate: Up to 2000 V/s
20 MHz Full Power Bandwidth, 20 V pk-pk, RL = 500 ⍀
Fast Settling: 100 ns to 0.1% (10 V Step)
Differential Gain Error: 0.03% at 4.4 MHz
Differential Phase Error: 0.15؇ at 4.4 MHz
High Output Drive: ؎50 mA into 50 Ω Load
Low Offset Voltage: 150 V max (B Grade)
Low Quiescent Current: 6.5 mA
Available in Tape and Reel in Accordance with
EIA-481A Standard
APPLICATIONS
Flash ADC Input Amplifiers
High Speed Current DAC Interfaces
Video Buffers and Cable Drivers
Pulse Amplifiers
PRODUCT DESCRIPTION
The AD844 is a high speed monolithic operational amplifier fab-
ricated using Analog Devices’ junction isolated complementary
bipolar (CB) process. It combines high bandwidth and very fast
large signal response with excellent dc performance. Although
optimized for use in current to voltage applications and as an
inverting mode amplifier, it is also suitable for use in many non-
inverting applications.
The AD844 can be used in place of traditional op amps, but its
current feedback architecture results in much better ac perfor-
mance, high linearity and an exceptionally clean pulse response.
This type of op amp provides a closed-loop bandwidth which is
determined primarily by the feedback resistor and is almost in-
dependent of the closed-loop gain. The AD844 is free from the
slew rate limitations inherent in traditional op amps and other
current-feedback op amps. Peak output rate of change can be
over 2000 V/µs for a full 20 V output step. Settling time is typi-
cally 100 ns to 0.1%, and essentially independent of gain. The
AD844 can drive 50 Ω loads to ± 2.5 V with low distortion and
is short circuit protected to 80 mA.
The AD844 is available in four performance grades and three
package options. In the 16-pin SOIC (R) package, the AD844J
is specified for the commercial temperature range of 0°C to
+70°C. The AD844A and AD844B are specified for the indus-
trial temperature range of –40°C to +85°C and are available in
the cerdip (Q) package. The AD844A is also available in an 8-pin
plastic mini-DIP (N). The AD844S is specified over the military
temperature range of –55°C to +125°C. It is available in the
8-pin cerdip (Q) package. “A” and “S” grade chips and devices
processed to MIL-STD-883B, REV. C are also available.
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
CONNECTION DIAGRAMS
8-Pin Plastic (N),
and Cerdip (Q) Packages
16-Pin SOIC
(R) Package
PRODUCT HIGHLIGHTS
1. The AD844 is a versatile, low cost component providing an
excellent combination of ac and dc performance. It may be
used as an alternative to the EL2020 and CLC400/1.
2. It is essentially free from slew rate limitations. Rise and fall
times are essentially independent of output level.
3. The AD844 can be operated from ± 4.5 V to ± 18 V power
supplies and is capable of driving loads down to 50 Ω, as
well as driving very large capacitive loads using an external
network.
4. The offset voltage and input bias currents of the AD844 are
laser trimmed to minimize dc errors; VOS drift is typically
1 µV/°C and bias current drift is typically 9 nA/°C.
5. The AD844 exhibits excellent differential gain and differen-
tial phase characteristics, making it suitable for a variety of
video applications with bandwidths up to 60 MHz.
6. The AD844 combines low distortion, low noise and low drift
with wide bandwidth, making it outstanding as an input am-
plifier for flash A/D converters.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
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Inverting Gain of 1 AC Characteristics
AD844
Figure 10. Inverting Amplifier,
Gain of –1 (R1 = R2)
Figure 11. Gain vs. Frequency for
Gain = –1, RL = 500 Ω, CL = 0 pF
Figure 12. Phase vs. Frequency
Gain = –1, RL = 500 Ω, CL = 0 pF
Figure 13. Large Signal Pulse
Response, Gain = –1, R1 = R2 = 1 kΩ
Inverting Gain of 10 AC Characteristics
Figure 14. Small Signal Pulse
Response, Gain = –1, R1 = R2 = 1 kΩ
Figure 15. Gain of –10 Amplifier
Figure 16. Gain vs. Frequency,
Gain = –10
REV. C
–5–
Figure 17. Phase vs. Frequency,
Gain = –10
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Video Cable Driver Using ± 5 Volt Supplies
The AD844 can be used to drive low impedance cables. Using
± 5 V supplies, a 100 Ω load can be driven to ± 2.5 V with low
distortion. Figure 35a shows an illustrative application which
provides a noninverting gain of 2, allowing the cable to be
reverse-terminated while delivering an overall gain of +1 to the
Applications–AD844
load. The –3 dB bandwidth of this circuit is typically 30 MHz.
Figure 35b shows a differential gain and phase test setup. In
video applications, differential-phase and differential-gain
characteristics are often important. Figure 35c shows the varia-
tion in phase as the load voltage varies. Figure 35d shows the
gain variation.
Figure 35a. The AD844 as a Cable Driver
Figure 35b. Differential Gain/Phase Test Setup
Figure 35c. Differential Phase for the Circuit of Figure 35a Figure 35d. Differential Gain for the Circuit of Figure 35a
High Speed DAC Buffer
The AD844 performs very well in applications requiring
current-to-voltage conversion. Figure 36 shows connections for
use with the AD568 current output DAC. In this application
the bipolar offset is used so that the full-scale current is
± 5.12 mA, which generates an output of ± 5.12 V using the
1 kΩ application resistor on the AD568. Figure 37 shows the
full-scale transient response. Care is needed in power supply
decoupling and grounding techniques to achieve the full 12-bit
accuracy and realize the fast settling capabilities of the system.
The unmarked capacitors in this figure are 0.1 µF ceramic (for
example, AVX Type SR305C104KAA), and the ferrite induc-
tors should be about 2.5 µH (for example, Fair-Rite Type
2743002122). The AD568 data sheet should be consulted for
more complete details about its use.
Figure 36. High Speed DAC Amplifier
REV. C
Figure 37. DAC Amplifier Full-Scale Transient Response
–11–
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