AD844_07 AD [Analog Devices], AD844_07 Datasheet

AD844_07

Manufacturer Part Number

AD844_07

Description

60 MHz, 2000 V/us Monolithic Op Amp

Manufacturer

AD [Analog Devices]

Datasheet

1.AD844_07.pdf (16 pages)

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PRODUCT DESCRIPTION

The AD844 is a high-speed monolithic operational amplifier

fabricated using Analog Devices’ junction isolated complemen-

tary 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

noninverting 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 inde-

pendent 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 typically

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-lead 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 industrial tem-

perature range of –40°C to +85°C and are available in the cerdip (Q)

package. The AD844A is also available in an 8-lead plastic

mini-DIP (N). The AD844S is specified over the military tempera-

ture range of –55°C to +125°C. It is available in the 8-lead

cerdip (Q) package. “A” and “S” grade chips and devices processed

to MIL-STD-883B, REV. C are also available.

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

NULL

and Cerdip (Q) Packages

–V

–IN

+IN

excellent combination of ac and dc performance.

times are essentially independent of output level.

supplies and is capable of driving loads down to 50 Ω, as well

as driving very large capacitive loads using an external network.

laser trimmed to minimize dc errors; V

1 µV/°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

amplifier for flash A/D converters.

8-Lead Plastic (N),

(Not to Scale)

TOP VIEW

AD844

CONNECTION DIAGRAMS

NULL

OUTPUT

60 MHz, 2000 V/ s

Monolithic Op Amp

OFFSETNULL

–IN

+IN

V–

16-Lead SOIC

(R) Package

NC = NO CONNECT

(Not to Scale)

TOP VIEW

AD844

drift is typically

OFFSETNULL

V+

OUTPUT

Related parts for AD844_07

AD844_07 Summary of contents

Page 1

PRODUCT DESCRIPTION The AD844 is a high-speed monolithic operational amplifier fabricated using Analog Devices’ junction isolated complemen- tary bipolar (CB) process. It combines high bandwidth and very fast large signal response with excellent dc performance. Although optimized for use ...

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

Model Conditions OUTPUT SLEW RATE Overdriven Input FULL POWER BANDWIDTH p-p V OUT p-p V OUT THD = 3% OUTPUT CHARACTERISTICS Voltage R Short Circuit Current T –T MIN MAX ...

Page 4

AD844–Typical Characteristics SUPPLY VOLTAGE – V Ω SUPPLY VOLTAGE – ...

Page 5

Inverting Gain-of-1 AC Characteristics +V S 4.7 0. – IN AD844 V OUT + 0.22 F 4.7 –V S Inverting Gain-of-10 AC Characteristics +V S 4.7 0.22 F 500 50 V – ...

Page 6

AD844 Inverting Gain-of-10 Pulse Response Noninverting Gain-of-10 AC Characteristics +V S 0.22 F 4.7 450 – V OUT 50 AD844 0. 4.7 –V S Ω Ω 500 ...

Page 7

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

Page 8

AD844 Table I. Gain (MHz) GBW (MHz) –1 1 kΩ 1 kΩ 35 500 Ω 500 Ω –1 60 –2 2 kΩ 1 kΩ 15 500 Ω –2 1 kΩ 30 –5 5 kΩ 1 kΩ 5.2 ...

Page 9

It is important to understand that the low input impedance at the inverting input is locally generated, and does not depend on feedback. This is very different from the “virtual ground” conventional operational amplifier used in the current ...

Page 10

AD844 Input Impedance At low frequencies, negative feedback keeps the resistance at the inverting input close to zero. As the frequency increases, the impedance looking into this input will increase from near zero to the open loop input resistance, due ...

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AD844_07 AD [Analog Devices], AD844_07 Datasheet

AD844_07

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AD844_07 Summary of contents

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