AD648 Analog Devices, AD648 Datasheet

AD648

Manufacturer Part Number

AD648

Description

Dual Precision/ Low Power BiFET Op Amp

Manufacturer

Analog Devices

Datasheet

1.AD648.pdf (12 pages)

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PRODUCT DESCRIPTION

The AD648 is a matched pair of low power, precision mono-

lithic operational amplifiers. It offers both low bias current

(10 pA max, warmed up) and low quiescent current (400 A

max) and is fabricated with ion-implanted FET and laser wafer

trimming technologies. Input bias current is guaranteed over the

AD648’s entire common-mode voltage range.

The economical J grade has a maximum guaranteed offset volt-

age of less than 2 mV and an offset voltage drift of less than

20 V/ C. The C grade reduces offset voltage to less than

0.30 mV and offset voltage drift to less than 3 V/ C. This level

of dc precision is achieved utilizing Analog’s laser wafer drift

trimming process. The combination of low quiescent current

and low offset voltage drift minimizes changes in input offset

voltage due to self-heating effects. Five additional grades are

offered over the commercial, industrial and military temperature

ranges.

The AD648 is recommended for any dual supply op amp appli-

cation requiring low power and excellent dc and ac perfor-

mance. In applications such as battery-powered, precision

instrument front ends and CMOS DAC buffers, the AD648’s

excellent combination of low input offset voltage and drift, low

bias current and low 1/f noise reduces output errors. High

common-mode rejection (86 dB, min on the “C” grade) and

high open-loop gain ensures better than 12-bit linearity in high

impedance, buffer applications.

The AD648 is pinned out in a standard dual op amp configura-

tion and is available in seven performance grades. The AD648J

and AD648K are rated over the commercial temperature range

of 0 C to +70 C. The AD648A, AD648B and AD648C are

rated over the industrial temperature range of –40 C to +85 C.

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

DC Performance

AC Performance

Available in Plastic Mini-DIP, Cerdip, Plastic SOIC

MIL-STD-883B Parts Available

Surface Mount (SOIC) Package Available in Tape and

Single Version: AD548

400 A max Quiescent Current

10 pA max Bias Current, Warmed Up (AD648C)

300 V max Offset Voltage (AD648C)

3 V/ C max Drift (AD648C)

2 V p-p Noise, 0.1 Hz to 10 Hz

1.8 V/ s Slew Rate

1 MHz Unity Gain Bandwidth

and Hermetic Metal Can Packages

Reel in Accordance with EIA-481A Standard

The AD648S and AD648T are rated over the military tempera-

ture range of –55 C to +125 C and are available processed to

PRODUCT HIGHLIGHTS

1. A combination of low supply current, excellent dc and ac

2. The AD648 is pin compatible with industry standard dual op

3. Guaranteed low input offset voltage (2 mV max) and drift

4. Analog Devices specifies each device in the warmed-up con-

5. Matching characteristics are excellent for all grades. The

6. Crosstalk between amplifiers is less than –120 dB at 1 kHz.

7. The AD648 is available in chip form.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

MIL-STD-883B, Rev. C.

The AD648 is available in an 8-pin plastic mini-DIP, cerdip,

SOIC, TO-99 metal can, or in chip form.

performance and low drift makes the AD648 the ideal op

amp for high performance, low power applications.

amps such as the LF442, TL062, and AD642, enabling

designers to improve performance while achieving a reduc-

tion in power dissipation of up to 85%.

(20 V/ C max) for the AD648J are achieved utilizing Analog

Devices’ laser drift trimming technology.

dition, insuring that the device will meet its published specifi-

cations in actual use.

input offset voltage matching between amplifiers in the

AD648J is within 2 mV, for the C grade matching is within

0.4 mV.

Low Power BiFET Op Amp

CONNECTION DIAGRAMS

Dual Precision,

AD648

Fax: 617/326-8703

Related parts for AD648

AD648 Summary of contents

Page 1

... The AD648 is pinned out in a standard dual op amp configura- tion and is available in seven performance grades. The AD648J and AD648K are rated over the commercial temperature range +70 C. The AD648A, AD648B and AD648C are rated over the industrial temperature range of – ...

Page 2

... Operating, Rated Performance Commercial ( +70 C) Industrial (– +85 C) Military (– +125 C) PACKAGE OPTIONS SOIC (R-8) Plastic (N-8) Cerdip (Q-8) AD648AQ, AD648SQ, AD648SQ/883B Metal Can (H-08A) Tape and Reel AD648JR-REEL, AD648JR-REEL7 Chips Available AD648JChips, AD648SChips (@ + 25 C and dc, unless otherwise noted) ...

Page 3

... Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite Differential Input Voltage . . . . . . . . . . . . . . . . . . +V Storage Temperature Range ( – +150 C Storage Temperature Range ( – +125 C Operating Temperature Range AD648J +70 C AD648A/B – +85 C AD648S – +125 C Lead Temperature Range (Soldering 60 sec +300 C NOTES 1 Stresses above those listed under “ ...

Page 4

... AD648—Typical Characteristics –4– REV. C ...

Page 5

... REV. C –5– AD648 ...

Page 6

... Common-mode range extends from 3 V more positive than the negative supply more negative than the positive supply. Designed to cleanly drive and 100 pF loads, the AD648 will drive load with re- duced open-loop gain. Figure 21 shows the recommended crosstalk test circuit. A typi- cal value for crosstalk is – ...

Page 7

... D/A CONVERTER BIPOLAR OUTPUT BUFFER The circuit in Figure 24 provides 4 quadrant multiplication with a resolution of 12 bits. The AD648 is used to convert the AD7545 Figure 24. 12-Bit Plus Sign Magnitude D/A Converter SIGN BIT 0 ...

Page 8

... Figure 28. Photodiode Pre-Amp Errors Over Temperature DUAL PHOTODIODE PREAMP The performance of the dual photodiode preamp shown in Fig- ure 27 is enhanced by the AD648’s low input current, input voltage offset, and offset voltage drift. Each photodiode sources a current proportional to the incident light power on its surface. ...

Page 9

... INSTRUMENTATION AMPLIFIER The AD648J’s maximum input current per amplifier makes it an excellent building block for the high input imped- ance instrumentation amplifier shown in Figure 29. Total cur- rent drain for this circuit is under 600 A. This configuration is optimal for conditioning differential voltages from high imped- ance sources ...

Page 10

... This circuit ensures a 1% log conformance error over an input is the reverse satura- current range of 300 mA, with low level accuracy limited by the AD648’s input current. The low level input voltage accu- racy of this circuit is limited by the input offset voltage and drift of the AD648. ...

Page 11

... REV. C OUTLINE DIMENSIONS Dimensions shown in inches and (mm). –11– AD648 ...

Page 12

–12– ...

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