ad642k Analog Devices, Inc., ad642k Datasheet

ad642k

Manufacturer Part Number

ad642k

Description

Precision, Low Cost Dual Bifet Op Amp

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD642K.pdf (6 pages)

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PRODUCT DESCRIPTION

The AD642 is a pair of matched high speed monolithic BiFET

operational amplifier fabricated with the most advanced bipolar,

JFET and laser trimming technologies. The AD642 offers

matched bias currents that are significantly lower than currently

available monolithic dual FET input operational amplifiers:

35 pA max matched to 25 pA for the AD642K and L; 75 pA

max, matched to 35 pA for the AD642J and S. In addition, the

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

to 0.25 mV for the AD642L, 1.0 mV and matched to 0.5 mV for

the AD642K, utilizing Analog’s laser-wafer trimming (LWT)

process.

The tight matching and temperature tracking between the

operational 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. The

optimizes the process to product matched bias currents 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 combined with superior IC

processing guarantees offset voltage tracking over the tempera-

ture range.

The AD642 is recommended for applications in which excellent

ac and dc performance is required. The matched amplifiers

provide a low-cost solution for true instrumentation amplifiers,

log ratio amplifiers, and output amplifiers for four quadrant

multiplying D/A converters such as the AD7541.

REV. 0

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 Current

Crosstalk: –124 dB @ 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 Open Loop Gain

Low Quiescent Current: 2.8 mA max

Low Total Harmonic Distortion

Standard Dual Amplifier Pin Out

Available in Hermetic Metal Can Package and Chip Form

MIL-STD-883B Processing Available

Single Version Available: AD542

The AD642 is available in four versions: the ‘‘J’’, ‘‘K’’ and ‘‘L,’’

all specified over the 0 C to +70 C temperature range and one

PRODUCT HIGHLIGHTS

1. The AD642 has tight matching specifications to ensure high

2. Analog Devices, unlike some manufacturers, specifies each

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

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

5. The standard dual amplifier pin out allows the AD642 to

6. The AD642 is available in chip form.

version, ‘‘S,’’ over the –55 C to +125 C extended operating

temperature range. All devices are packaged in the hermetically-

sealed, TO-99 metal can or available in chip form.

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

Tel: 617/329-4700

performance, eliminating the need to match individual

devices.

device for the maximum bias current at either input in the

warmed-up condition, thus assuring the user that the AD642

will meet its published specifications in actual use.

(AD642L), thus eliminating the need for external nulling.

enhance the AD642’s performance as a precision op amp.

replace lower performance duals without redesign.

0.5 mV max and matched side to side to 0.25 mV

PIN CONFIGURATION

Precision, Low Cost

Dual BiFET Op Amp

AD642

Fax: 617/326-8703

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ad642k Summary of contents

Page 1

... FET input operational amplifiers max matched for the AD642K and max, matched for the AD642J and S. In addition, the offset voltage is laser trimmed to less than 0.5 mV and matched to 0.25 mV for the AD642L, 1.0 mV and matched to 0.5 mV for the AD642K, utilizing Analog’ ...

Page 2

... AD642JH AD642KH = + 0.100 (2.54) 0.160 (4.06) BSC 0.110 (2.79 0.045 (1.14) 0.027 (0.69 0.034 (0.86) 0.027 (0.69) 45 BSC –2– AD642L AD642S Min Typ Max Min Typ Max 250,000 250,000 ...

Page 3

Figure 1. Input Voltage Range vs. Supply Voltage Figure 4. Quiescent Current vs. Supply Voltage Figure 7. Input Bias Current vs. CMV Figure 10. Open Loop Frequency Response REV. 0 REV. 0 Typical Characteristics–AD642 Figure 2. Output Voltage Swing vs. ...

Page 4

AD642 Figure 13. Common-Mode Rejection Ratio vs. Frequency Figure 16. Total Harmonic Distortion vs. Frequency a. Unity Gain Follower Figure 19 Test Circuits Figure 21a. Unity Gain Follower Pulse Response (Large Signal) Figure 22a. ...

Page 5

... This effect will cause a nonlinearity whose magnitude is dependent on the offset voltage of the amplifier. The AD642K with trimmed offset will minimize the effect. The Schottky protection diodes recommended for use with many older CMOS DACs are not required when using the AD642 ...

Page 6

AD642 AD642 linearization of transducers having exponential outputs, and analog computing, ranging from simple translation of natural relationships in log form (e.g., computing absorbance as the log- ratio of input currents), to the use of logarithms in facilitating analog computation ...

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