AD844JR Analog Devices, AD844JR Datasheet

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AD844JR

Manufacturer Part Number
AD844JR
Description
60 MHz, 2000 V/us Monolithic Op Amp
Manufacturer
Analog Devices
Datasheet

Specifications of AD844JR

Case
SOP
Dc
96+

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a
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/ s 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
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.
FEATURES
Wide Bandwidth: 60 MHz at Gain of –1
Wide Bandwidth:
Very High Output Slew Rate: Up to 2000 V/ s
20 MHz Full Power Bandwidth, 20 V pk-pk, R
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:
Low Offset Voltage: 150 V max (B Grade)
Low Quiescent Current: 6.5 mA
Available in Tape and Reel in Accordance with
APPLICATIONS
Flash ADC Input Amplifiers
High Speed Current DAC Interfaces
Video Buffers and Cable Drivers
Pulse Amplifiers
EIA-481A Standard
33 MHz at Gain of –10
loads to 2.5 V with low distortion and
50 mA into 50
Load
L
= 500
PRODUCT HIGHLIGHTS
1. The AD844 is a versatile, low cost component providing an
2. It is essentially free from slew rate limitations. Rise and fall
3. The AD844 can be operated from 4.5 V to 18 V power
4. The offset voltage and input bias currents of the AD844 are
5. The AD844 exhibits excellent differential gain and differen-
6. The AD844 combines low distortion, low noise and low drift
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
and Cerdip (Q) Packages
excellent combination of ac and dc performance. It may be
used as an alternative to the EL2020 and CLC400/1.
times are essentially independent of output level.
supplies and is capable of driving loads down to 50 , as
well as driving very large capacitive loads using an external
network.
laser trimmed to minimize dc errors; V
1 V/ C and bias current drift is typically 9 nA/ C.
tial phase characteristics, making it suitable for a variety of
video applications with bandwidths up to 60 MHz.
with wide bandwidth, making it outstanding as an input am-
plifier for flash A/D converters.
8-Pin Plastic (N),
CONNECTION DIAGRAMS
Monolithic Op Amp
60 MHz, 2000 V/ s
16-Pin SOIC
(R) Package
OS
drift is typically
AD844
Fax: 617/326-8703

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AD844JR Summary of contents

Page 1

... 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 ...

Page 2

AD844–SPECIFICATIONS Model Conditions 1 INPUT OFFSET VOLTAGE T –T MIN MAX vs. Temperature vs. Supply 5 V–18 V Initial T –T MIN MAX vs. Common Mode V Initial T –T MIN MAX INPUT BIAS CURRENT 1 –Input Bias Current T ...

Page 3

... Storage Temperature Range ( – +150 C Storage Temperature Range ( – +125 C Lead Temperature Range (Soldering 60 sec +300 C ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 V ORDERING GUIDE Temperature Model Range AD844JR +70 C AD844JR-REEL +70 C AD844AN – +85 C AD844AQ – +85 C AD844BQ – +85 C AD844SQ – +125 C AD844SQ/883B – ...

Page 4

AD844–Typical Characteristics Figure 1. –3 dB Bandwidth vs. Supply Voltage 500 Figure 4. Noninverting Input Voltage Swing vs. Supply Voltage Figure 7. Inverting Input Bias Cur- rent (I ) and Noninverting Input BN Bias Current (I ...

Page 5

Inverting Gain Characteristics Figure 10. Inverting Amplifier, Gain of –1 (R1 = R2) Figure 13. Large Signal Pulse Response, Gain = – Inverting Gain Characteristics Figure 15. Gain ...

Page 6

AD844 Inverting Gain of 10 Pulse Response Figure 18. Large Signal Pulse Response, Gain = –10, R Noninverting Gain Characteristics Figure 20. Noninverting Gain of +10 Amplifier Figure 23. Noninverting Amplifier Large Signal Pulse Response, Gain = ...

Page 7

UNDERSTANDING THE AD844 The AD844 can be used in ways similar to a conventional op amp while providing performance advantages in wideband ap- plications. However, there are important differences in the inter- nal structure which need to be understood in ...

Page 8

AD844 Response as an I-V Converter The AD844 works well as the active element in an operational current to voltage converter, used in conjunction with an exter- nal scaling resistor, R1, in Figure 27. This analysis includes the stray capacitance, ...

Page 9

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 ...

Page 10

AD844 Driving Large Capacitive Loads Capacitive drive capability is 100 pF without an external net- work. With the addition of the network shown in Figure 31, the capacitive drive can be extended to over 10,000 pF, limited by internal power ...

Page 11

Video Cable Driver Using 5 Volt Supplies The AD844 can be used to drive low impedance cables. Using 5 V supplies, a 100 load can be driven to 2.5 V with low distortion. Figure 35a shows an illustrative application which ...

Page 12

AD844 20 MHz Variable Gain Amplifier The AD844 is an excellent choice as an output amplifier for the AD539 multiplier, in all of its connection modes. (See AD539 data sheet for full details.) Figure 38 shows a simple multiplier providing ...

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