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EPAD

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GENERAL DESCRIPTION

ALD210800A/ALD210800 precision N-Channel EPAD

sion matched at the factory using ALD’s proven EPAD

quad monolithic devices are enhanced additions to the ALD110800A/ALD110800

EPAD

conductance, particularly at very low supply voltages.

Intended for low voltage, low power small signal applications, the ALD210800A/

ALD210800 features Zero-Threshold™ voltage, which enables circuit designs

with input/output signals referenced to GND at enhanced operating voltage

ranges. With these devices, a circuit with multiple cascading stages can be

built to operate at extremely low supply/bias voltage levels. For example, a

nanopower input amplifier stage operating at <0.2V supply voltage has been

successfully built with these devices.

ALD210800A/ALD210800 EPAD MOSFETs feature exceptional matched pair

only +/- 0.001V (1mV). Built on a single monolithic chip, they also exhibit excel-

lent temperature tracking characteristics. These precision devices are versatile

as design components for a broad range of analog small signal applications

such as basic building blocks for current mirrors, matching circuits, current

sources, differential amplifier input stages, transmission gates, and multiplex-

ers. They also excel in limited operating voltage applications, such as very low

level voltage-clamps and nano-power normally-on circuits.

In addition to precision matched-pair electrical characteristics, each individual

EPAD MOSFET also exhibits well controlled manufacturing characteristics, en-

abling the user to depend on tight design limits from different production batches.

These devices are built for minimum offset voltage and differential thermal re-

sponse, and they can be used for switching and amplifying applications in +0.1V

to +10V (+/- 0.05V to +/-5V) powered systems where low input bias current, low

device operates in the subthreshold voltage region and exhibits conventional

depletion mode characteristics, with well controlled turn-off and sub-threshold

levels that operate the same as standard enhancement mode MOSFETs.

output current of 30mA and input current of 300pA at 25°C is 30mA/300pA =

100,000,000, which translates into a dynamic operating current range of about

eight orders of magnitude. A series of four graphs titled “Forward Transfer Char-

acteristic”, with sub-titles of second “expanded (subthreshold)”, third “further

expanded (subthreshold)” and fourth “Low Voltage” illustrates the unique wide

dynamic operating range of these devices.

Generally it is recommended that the V+ pin be connected to the most positive

voltage and the V- and IC (internally-connected) pins to the most negative volt-

age in the system. All other pins must have voltages within these voltage limits

at all times. Standard ESD protection facilities and handling procedures for static

sensitive devices are highly recommended when using these devices.

QUAD HIGH DRIVE ZERO THRESHOLD™ MATCHED PAIR

FEATURES & BENEFITS

• Sub-threshold voltage (nano-power) operation

• < 100 mV Min. operating voltage

• < 1 nA Min. operating current

• < 1 nW Min. operating power

• > 100,000,000:1 operating current ranges

• High transconductance and output conductance

• Output current > 50 mA

• Matched and tracked tempco

• Tight lot-to-lot parametric control

• Low input capacitance and leakage currents

APPLICATIONS

• Low overhead current mirrors and current sources

• Zero Power Normally-On circuits

• Energy harvesting detectors

• Very low voltage analog and digital circuits

• Zero power fail-safe circuits

• Backup battery circuits & power failure detector

• Extremely low level voltage-clamps

• Extremely low level zero-crossing detectors

• Matched source followers and buffers

• Precision current mirrors and current sources

• Matched capacitive probes and sensor interfaces

• Charge detectors and charge integrators

• High gain differential amplifier input stage

• Matched peak-detectors and level-shifters

• Multiple Channel Sample-and-Hold switches

• Precision Current multipliers

• Discrete matched analog switches / multiplexers

• Nanopower discrete voltage comparators

ALD210800/ALD210800A

*IC pins are internally connected, connect to V-

SCL, PCL PACKAGES

PIN CONFIGURATION

VGS(th)= +0.00V

ALD210800

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

Operating Temperature Range*

0°C to +70°C

16-Pin SOIC

16-Pin Plastic Dip

Package

Package

ALD210800ASCL

ALD210800APCL

ALD210800SCL

ALD210800PCL

IC*

1

2

3

14

15

16

4

13

5

12

6

7

8

10

11

IC*

9

M 4

M 1

M 2

M 3