ALD114935SAL 参数 Datasheet PDF下载

A

DVANCED

L

INEAR

D

EVICES,

I

NC.

ALD114835/ALD114935

QUAD/DUAL N-CHANNEL DEPLETION MODE EPAD®

VGS(th)= -3.50V

PRECISION MATCHED PAIR MOSFET ARRAY

APPLICATIONS

• Functional replacement of Form B (NC) relay

• Zero power fail safe circuits

• Backup battery circuits

• Power failure detector

• Fail safe signal detector

• Source followers and buffers

• Precision current mirrors

• Precision current sources

• Capacitives probes

• Sensor interfaces

• Charge detectors

• Charge integrators

• Differential amplifier input stage

• High side switches

• Peak detectors

• Sample and Hold

• Alarm systems

• Current multipliers

• Analog switches

• Analog multiplexers

• Voltage comparators

• Level shifters

PIN CONFIGURATIONS

ALD114835

IC*

G

N1

D

N1

S

12

V

-

D

N4

G

N4

IC*

1

2

3

4

5

6

7

8

V

-

V

-

V

-

M4

M3

M1

M2

e

TM

EPAD

E

N

®

AB

LE

D

GENERAL DESCRIPTION

ALD114835/ALD114935 are high precision monolithic quad/dual depletion mode

N-Channel MOSFETs matched at the factory using ALD’s proven EPAD CMOS

technology. These devices are intended for low voltage, small signal applica-

tions. They are excellent functional replacements for normally-closed relay ap-

plications, as they are normally on (conducting) without any power applied, but

could be turned off or modulated when system power supply is turned on. These

MOSFETs have the unique characteristics of, when the gate is grounded, oper-

ating in the resistance mode for low drain voltage levels and in the current

source mode for higher voltage levels and providing a constant drain current.

ALD114835/ALD114935 MOSFETs are designed for exceptional device elec-

trical characteristics matching. As these devices are on the same monolithic

chip, they also exhibit excellent temperature tracking characteristics. They are

versatile as design components for a broad range of analog applications such

as basic building blocks for current sources, differential amplifier input stages,

transmission gates, and multiplexer applications. Besides matched pair electri-

cal characteristics, each individual MOSFET also exhibits well controlled pa-

rameters, enabling the user to depend on tight design limits. Even units from

different batches and different date of manufacture have correspondingly well

matched characteristics.

These depletion mode devices are built for minimum offset voltage and differ-

ential thermal response, and they are designed for switching and amplifying

applications in single 5V to +/-5V systems where low input bias current, low

input capacitance and fast switching speed are desired. These devices exhibit

well controlled turn-off and sub-threshold charactersitics and therefore can be

used in designs that depend on sub-threshold characteristics.

The ALD114835/ALD114935 are suitable for use in precision applications which

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

A sample calculation of the DC current gain at a drain current of 3mA and gate

input leakage current of 30pA = 100,000,000. It is recommended that the user,

for most applications, connect the V+ pin to the most positive voltage and the

V- and IC pins to the most negative voltage in the system. All other pins must

have voltages within these voltage limits at all times.

FEATURES

• Depletion mode (normally ON)

• Precision Gate Threshold Voltages: -3.50V +/- 0.05V

• Nominal R

DS(ON)

@V

GS

=0.0V of 540Ω

• Matched MOSFET to MOSFET characteristics

• Tight lot to lot parametric control

• Low input capacitance

• V

GS(th)

match (V

OS

) — 20mV

• High input impedance — 10

12

Ω

typical

• Positive, zero, and negative V

GS(th)

temperature coefficient

• DC current gain >10

8

• Low input and output leakage currents

ORDERING INFORMATION

(“L” suffix

denotes lead-free (RoHS))

Operating Temperature Range*

0°C to +70°C

0°C to +70°C

16-Pin

SOIC

Package

16-Pin

Plastic Dip

Package

8-Pin

SOIC

Package

8-Pin

Plastic Dip

Package

V

-

V

-

16

15

14

IC*

G

N2

D

N2

V

+

S

34

D

N3

G

N3

IC*

V

+

13

12

11

10

9

SCL, PCL PACKAGES

ALD114935

IC*

G

N1

D

N1

S

12

1

2

3

4

M1

M2

V-

V-

8

7

6

IC*

G

N2

D

N2

V-

V-

SAL, PAL PACKAGES

5

ALD114835SCL ALD114835PCL ALD114935SAL ALD114935PAL

* Contact factory for industrial temp. range or user-specified threshold voltage values

*IC pins are internally connected,

connect to V-

Rev 2.1 ©2012 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286

www.aldinc.com