DUAL N-CHANNEL AND DUAL P-CHANNEL MATCHED PAIR MOSFET

GENERAL DESCRIPTION

The ALD1105 is a monolithic dual N-channel and dual P-channel

complementary matched transistor pair intended for a broad range of

analog applications.

These enhancement-mode transistors are

manufactured with Advanced Linear Devices' enhanced ACMOS silicon

gate CMOS process. It consists of an ALD1116 N-channel MOSFET pair

and an ALD1117 P-channel MOSFET pair in one package. The ALD1105

is a low drain current, low leakage current version of the ALD1103.

The ALD1105 offers high input impedance and negative current temperature

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

differential thermal response, and it is designed for precision signal

switching and amplifying applications in +1V 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 in complementary pairs, a dual CMOS analog switch can be

constructed. In addition, the ALD1105 is intended as a building block for

differential amplifier input stages, transmission gates, and multiplexer

applications.

The ALD1105 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 30pA at room temperature. For example, DC beta of the device

at a drain current of 3mA at 25

°C is = 3mA/30pA = 100,000,000.

FEATURES

• Thermal tracking between N-channel and P-channel pairs

• Low threshold voltage of 0.7V for both N-channel &

P-channel MOSFETs

• Low input capacitance

• Low Vos -- 10mV

Ω typical

• Low input and output leakage currents

• Enhancement mode (normally off)

• Matched N-channel pair and matched P-channel pair in one package

ALD1105

PIN CONFIGURATION

APPLICATIONS

• Precision current mirrors

• Complementary push-pull linear drives

• Discrete Analog switches

• Analog signal Choppers

• Differential amplifier input stage

• Voltage comparator

• Data converters

• Sample and Hold

• Analog current inverter

• Precision matched current sources

DN2

GN2

SN2

GP2

SP2

GN1

SN1

DP1

GP1

1

2

3

4

DB, PB, SB PACKAGE

5

6

7

8

9

10

11

12

13

14

DN1

DP2

SP1

BLOCK DIAGRAM

N SOURCE 1 (3)

SUBSTRATE (4)

N SOURCE 2 (12)

N GATE 2 (13)

N DRAIN 1 (1)

N GATE 1 (2)

N DRAIN 2 (14)

P SOURCE 1 (7)

SUBSTRATE (11)

P SOURCE 2 (8)

P GATE 2 (9)

P DRAIN 1 (5)

P GATE 1 (6)

P DRAIN 2 (10)

Operating Temperature Range*

-55

°C to +125°C0°C to +70°C0°C to +70°C

14-Pin

14-Pin

14-Pin

CERDIP

Plastic Dip

SOIC

Package

Package

Package

ALD1105 DB

ALD1105 PB

ALD1105 SB

* Contact factory for industrial temperature range.

ORDERING INFORMATION

© 2005 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com