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DUAL N-CHANNEL MATCHED MOSFET PAIR

ALD1101A/ALD1101B

ALD1101

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'

enhanced 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 +10V 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.

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

• Enhancement-mode (normally off)

• RoHS compliant

BLOCK DIAGRAM

SOURCE 1 (1)

SUBSTRATE (8)

SOURCE 2 (7)

GATE 2 (6)

DRAIN 1 (3)

GATE 1 (2)

DRAIN 2 (5)

PIN CONFIGURATION

TOP VIEW

SAL, PAL PACKAGES

* IC pin is internally connected. Do not connect externally.

1

2

3

4

8

7

6

5

IC

SUBSTRATE

* Contact factory for high temperature versions.

ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))

Operating Temperature Range*

0°C to +70°C0°C to +70°C

8-Pin

8-Pin

SOIC

Plastic Dip

Package

Package

ALD1101ASAL

ALD1101APAL

ALD1101BSAL

ALD1101BPAL

ALD1101SAL

ALD1101PAL