GENERAL DESCRIPTION

The ALD1101 is a monolithic dual N-channel matched transistor pair

intended for a broad range of analog applications. These enhancement-

mode transistors are manufactured with Advanced Linear Devices' en-

hanced ACMOS silicon gate CMOS process.

The ALD1101 offers high input impedance and negative current tempera-

ture coefficient. The transistor pair is matched for minimum offset voltage

and differential thermal response, and it is designed for switching and

amplifying applications in +2V to +12V systems where low input bias

current, low input capacitance and fast switching speed are desired. Since

these are MOSFET devices, they feature very large (almost infinite)

current gain in a low frequency, or near DC, operating environment. When

used with an ALD1102, a dual CMOS analog switch can be constructed.

In addition, the ALD1101 is intended as a building block for differential

amplifier input stages, transmission gates, and multiplexer applications.

The ALD1101 is suitable for use in precision applications which require

very high current gain, beta, such as current mirrors and current sources.

The high input impedance and the high DC current gain of the Field Effect

Transistors result in extremely low current loss through the control gate.

The DC current gain is limited by the gate input leakage current, which is

specified at 50pA at room temperature. For example, DC beta of the device

at a drain current of 5mA at 25

°C is = 5mA/50pA = 100,000,000.

DUAL N-CHANNEL MATCHED MOSFET PAIR

ALD1101A/ALD1101B

ALD1101

APPLICATIONS

• Precision current mirrors

• Precision current sources

• Analog switches

• Choppers

• Differential amplifier

input stage

• Voltage comparator

• Data converters

• Sample and Hold

• Analog inverter

FEATURES

• Low threshold voltage of 0.7V

• Low input capacitance

• Low Vos grades -- 2mV, 5mV, 10mV

Ω typical

coefficient

• Enhancement-mode (normally off)

Operating Temperature Range*

-55

°C to +125°C0°C to +70°C0°C to +70°C

8-Pin

8-Pin

8-Pin

CERDIP

Plastic Dip

SOIC

Package

Package

Package

ALD1101A PA

ALD1101B PA

ALD1101 DA

ALD1101 PA

ALD1101 SA

* Contact factory for industrial temperature range.

ORDERING INFORMATION

BLOCK DIAGRAM

SOURCE 1 (1)

SUBSTRATE (8)

SOURCE 2 (7)

GATE 2 (6)

DRAIN 1 (3)

GATE 1 (2)

DRAIN 2 (5)

PIN CONFIGURATION

1

2

3

4

8

7

6

5

NC

SUBSTRATE

TOP VIEW

DA, PA, SA PACKAGE

© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com

© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com

© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com

© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com