ad644j Analog Devices, Inc., ad644j Datasheet

ad644j

Manufacturer Part Number

ad644j

Description

Dual High Speed, Implanted Bifet Op Amp

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD644J.pdf (6 pages)

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PRODUCT DESCRIPTION

The AD644 is a pair of matched high speed monolithic FET in-

put operational amplifiers fabricated with the most advanced bi-

polar, JFET and laser-trimming technologies. The AD644 offers

matched bias currents that are significantly lower than currently

available monolithic dual BiFET operational amplifiers: 35 pA

max, matched to 25 pA for the AD644K and L, 75 pA max

matched to 35 pA for the AD644J and S. In addition, the offset

voltage is laser trimmed to less than 0.5 mV, and matched to

0.25 mV for the AD644L, 1.0 mV and matched to 0.5 mV for

the AD644K, utilizing Analog Devices’ laser-wafer trimming

(LWT) process.

The tight matching and temperature tracking between the op-

erational amplifiers is achieved by ion-implanted JFETs and

laser-wafer trimming. Ion-implantation permits the fabrication

of precision, matched JFETs on a monolithic bipolar chip. This

process optimizes the ability to produce matched amplifiers

which have lower initial bias currents than other popular BiFET

op amps. Laser-wafer trimming each amplifier’s input offset

voltage assures tight initial match and superior IC processing

guarantees offset voltage tracking over the temperature range.

The AD644 is recommended for applications in which both

excellent ac and dc performance is required. The matched am-

plifiers provide a low cost solution to true wideband instrumen-

tation amplifiers, low dc drift active filters and output amplifiers

for four quadrant multiplying D/A converters such as the

AD7541, 12-bit CMOS DAC.

The AD644 is available in four versions: the “J”, “K” and “L”

are specified over the 0 C to +70 C temperature range and the

“S” over the –55 C to +125 C operating temperature range.

REV. A

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

Matched Offset Voltage

Matched Offset Voltage Over Temperature

Matched Bias Currents

Crosstalk –124 dB at 1 kHz

Low Bias Current: 35 pA max Warmed Up

Low Offset Voltage: 500 V max

Low Input Voltage Noise: 2 V p-p

High Slew Rate: 13 V/ s

Low Quiescent Current: 4.5 mA max

Fast Settling to

Low Total Harmonic Distortion: 0.0015% at 1 kHz

Standard Dual Amplifier Pinout

Available in Hermetic Metal Can Package

MIL-STD-883B Processing Available

Single Version Available: AD544

and Chip Form

0.01%: 3 s

All devices are packaged in the hermetically sealed, TO-99

metal can or available in chip form.

PRODUCT HIGHLIGHTS

1. The AD644 has tight side to side matching specifications to

2. Analog Devices, unlike some manufacturers, specifies each

3. Laser-wafer-trimming reduces offset voltage to as low as

4. Improved bipolar and JFET processing on the AD644 result

5. Low voltage noise (2 V p-p) and high open loop gain

6. The high slew rate (13.0 V/ s) and fast settling time to

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

Tel: 617/329-4700

7. Low harmonic distortion (0.0015%) and low crosstalk

8. The standard dual amplifier pin out allows the AD644 to

9. The AD644 is available in chip form.

ensure high performance without matching individual devices.

device for the maximum bias current at either input in the

warmed-up condition, thus assuring the user that the AD644

will meet its published specifications in actual use.

0.5 mV max matched side to side to 0.25 mV (AD644L),

thus eliminating the need for external nulling.

in the lowest matched bias current available in a high speed

monolithic FET op amp.

enhance the AD644’s performance as a precision op amp.

0.01% (3.0 s) make the AD644 ideal for D/A, A/D, sample-

hold circuits and dual high speed integrators.

(–124 dB) make the AD644 an ideal choice for stereo audio

applications.

replace lower performance duals without redesign.

NONINVERTING

INVERTING

AMPLIFIER NO. 1

Implanted BiFET Op Amp

OUTPUT

INPUT

PIN CONFIGURATION

INPUT

NOTE:

PIN 4 CONNECTED TO CASE

VIEW

Dual High Speed,

TOP

–V

AMPLIFIER NO. 2

OUTPUT

NONINVERTING

INPUT

INVERTING

INPUT

AD644

Fax: 617/326-8703

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ad644j Summary of contents

Page 1

... BiFET operational amplifiers max, matched for the AD644K and max matched for the AD644J and S. In addition, the offset voltage is laser trimmed to less than 0.5 mV, and matched to 0.25 mV for the AD644L, 1.0 mV and matched to 0.5 mV for the AD644K, utilizing Analog Devices’ ...

Page 2

... Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units. Specifications subject to change without notice. (@ +25 C and dc) S AD644J AD644K Typ Max Min Typ Max ...

Page 3

REV. A Typical Characteristics–AD644 –3– ...

Page 4

AD644 –4– REV. A ...

Page 5

The fast settling time (3 0.01% for 20 V p-p step) and low offset voltage make the AD644 an excellent choice as an output amplifier for current output D/A converters such as the AD7541. The upper trace of ...

Page 6

AD644 Figure 27a illustrates the 10-bit digital-to-analog converter, AD7533, connected for bipolar operation. Since the digital in- put can accept bipolar numbers and V REF analog input, the circuit can perform a 4-quadrant multiplying function. The photos exhibit the response ...

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