Advanced Linear Devices

ALD2321A Datasheet Preview

ALD2321A Datasheet

ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR

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ADVANCED

LINEAR

DEVICES, INC.

ALD2321A/ALD2321B/ALD2321

ULTRA LOW VOS EPAD® DUAL CMOS ANALOG VOLTAGE COMPARATOR

GENERAL DESCRIPTION

The ALD2321A/ALD2321B/ALD2321 is a monolithic Precision Dual Volt-

age Comparator, each having integrated dual complementary output

drivers. It is constructed using advanced silicon gate CMOS technology.

Key features of the ALD2321A/ALD2321B/ALD2321 include very high

input impedance, very low offset voltage utilizing on-chip e-trim (EPAD®

electronic-trimming) technology, flexible multiple output configurations and

fast response time with small overdrive voltage. It is designed for ultra low

level signal detection from high impedance sources. For many applications

the ALD2321A/ALD2321B/ALD2321 can eliminate an input amplification

stage, a precision input bias stage, a signal level shift stage and an output

buffer stage, and do the entire job from low level input signal detection to high

output driver -- all on a single chip.

The input voltage includes ground, making this voltage comparator ideal for

single supply (+5V) or dual supply (± 5V) powered systems. For dual supply

applications, GND pin is connected to the most negative supply instead of

Ground (0.0V). The negative supply voltage can be at any value between

0.0V and -5V. Each voltage comparator is individually trimmed at the factory

for minimum offset voltage at ground voltage potential, making the ALD2321A/

ALD2321B/ALD2321 at its best offset voltage and ready to compare very

low signal level voltages at or near ground potential. Typically a signal less

than 1mV can be resolved and detected reliably without requiring amplifica-

tion. Sensor or detector signals with signal power as low as 0.004pW (4 x

10-15 Watt) can be readily detected.

Each voltage comparator has two complementary output pins, one for

Source Output (OUTH) and the other for Sink Output (OUT). This dual

complementary output allows maximum circuit design flexibility. The out-

puts can be used as Single-Ended Driver, Multiple WIRED-OR Outputs,

Push-Pull Outputs or Complementary Outputs. The Sink Output can be

used as an open drain output, which has current sink capability of up to

50mA. It can also be connected to an external voltage higher or lower than

V+, which provide level shift of the output swing levels from other than V+

to GND. The Source Output can source up to 2mA and can be used to drive

the base terminal of an external NPN bipolar device or the gate of a N-

channel MOSFET device. Alternatively, the two outputs, Source Output and

ORDERING INFORMATION (“L” suffix for lead free version)

Operating Temperature Range *

0°C to +70°C

-55°C to +125°C

16-Pin

Small Outline

Package (SOIC)

16-Pin

Plastic Dip

Package

16-Pin

CERDIP

Package

ALD2321ASCL

ALD2321BSCL

ALD2321SCL

ALD2321APCL

ALD2321BPCL

ALD2321PCL

ALD2321ADC

ALD2321BDC

ALD2321DC

* Contact factory for leaded (non-RoHS) or high temperature versions.

FEATURES

• Ultra low signal power of 4fW detectable

• Ultra low offset voltage of max. 0.2mV

• Ultra low input bias currents of typ. 0.01pA

• Low supply current of 110µA typical

• Virtually eliminates source impedance effects

• Low operating supply voltage of 4V to 10V

• Single (+5V) and dual supply (±5V) operation

• High speed for both small and large level

signals 300ns typical for TTL inputs

• CMOS, NMOS and TTL compatible

• Each comparator has separate push and

pull outputs

• High output sink current - typically 50mA

• Low supply current spikes

• Fanout of 30 TTL loads

APPLICATIONS

• Dual limit window comparator

• Power supply voltage monitor

• Photo-detector sensor circuit

• Relay or LED driver

• Oscillators

• Battery operated instruments

• Remote signal detection

PIN CONFIGURATION

OUT1

OUT1H

-IN1

+IN1

GND

VE11

VE12

N/C*

16 V+

15 OUT2

14 OUT2H

13 -IN2

12 +IN2

11 VE21

10 VE22

9 N/C*

SCL, PCL, DC PACKAGES

*N/C pins are connected internally.

Do not connect externally.

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Advanced Linear Devices

ALD2321A Datasheet Preview

ALD2321A Datasheet

ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR

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GENERAL DESCRIPTION (cont'd)

Sink Output, can be connected together to form a push-pull output

which has the combined output capabilities of both channels.

In the dual complementary output mode, each comparator can be

used to drive separate loads. Due to the complementary nature of

the two outputs, only one output is active at any a given time, except

for a limited crossover time. When OUT (sink output) is active ON,

the OUT pin is sinking current and the OUTH pin is OFF and in high

impedance mode. Conversely, if OUTH pin is ON and sourcing

current, OUT pin is OFF. To configure push-pull output, simply

connect OUT (sink output) pin to OUTH pin.

Since each voltage comparator has its own complementary out-

puts, each comparator can be configured to have a different output

type. For example, one comparator output can be connected as

Open Drain output while the other comparator can be wired as

push-pull output. If used to drive capacitive loads, the output DC

current levels are at a very low level, at essentially leakage current

levels, which can be a power saving feature.

The ALD2321A/ALD2321B/ALD2321 can detect and resolve very

low voltage levels at high speed, with little or no overdrive voltage.

Compared with other voltage comparator devices that require 100

mV overdrive voltages, or multiple stage circuits that include input

preamp, etc., the ALD2321A/ALD2321B/ALD2321 can perform all

input to output functions in one device with minimal delay time and

with as low as a 1mV signal.

The ALD2321A/ALD2321B/ALD2321 is supplied with 4 external e-

trim pins, VE11, VE12, VE21, and VE22. These pins are used for

trimming of the voltage comparator offset voltages at the factory,

and normally should be left open unconnected. However, in some

cases these pins can be used as positive/negative feedback pins,

since these pins have a positive/negative factor on the offset

voltage. For example, see TYPICAL APPLICATIONS section

titled "Voltage Comparator With Output Feedback to Provide

Hysteresis."

In a printed circuit board layout, it is suggested that

these pins, along with no connect (N/C) pins 8 and 9,

be surrounded with ground traces to prevent any

possible crosstalk and noise coupling from other signal

sources.

Although not required for most applications, if neces-

sary, small valued capacitors of approximately 1000pF

can be mounted at these pins to ground to further

reduce noise. For information on customized trimming

under different biasing and power supply conditions,

please contact factory.

BLOCK DIAGRAM

INVERTING INPUT

-IN 1 (3)

NONINVERTING INPUT

+IN 1 (4)

(16) V+

- (2) OUT1H

(1) OUT1

(7) VE12

(6) VE11

(5) GND

INVERTING INPUT

-IN 2 (13)

NONINVERTING INPUT

+IN 2 (12)

(8) (9)

N/C N/C

- (14) OUT2H

(15) OUT2

(10) VE22

(11) VE21

ALD2321 PIN IDENTIFICATION

PIN #

SYMBOL

OUT1

OUT1H

-IN1

+IN1

GND

VE11

VE12

N/C

VE22

VE21

+IN2

-IN2

OUT2H

OUT2

V+

FUNCTION

COMPARATOR 1 SINK OUTPUT

COMPARATOR 1 SOURCE OUTPUT

COMPARATOR 1 INVERTING INPUT

COMPARATOR 1 NON-INVERTING INPUT

GROUND / V- SUPPLY

- VOS E-Trim COMPARATOR 1

+ VOS E-Trim COMPARATOR 1

No Connect/Do Not connect externally

+VOS E-Trim COMPARATOR 2

- VOS E-Trim COMPARATOR 2

COMPARATOR 2 NON-INVERTING INPUT

COMPARATOR 2 INVERTING INPUT

COMPARATOR 2 SOURCE OUTPUT

COMPARATOR 2 SINK OUTPUT

V+ SUPPLY

ALD2321A/ALD2321B/ALD2321

Advanced Linear Devices

SIGNAL PROPAGATION

OUTPUT

INPUT

OUTPUT

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ALD2321A Datasheet

ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR

ALD2321A Datasheet

ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR

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