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Advanced Linear Devices

ALD2321 Datasheet Preview

ALD2321 Datasheet

ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR

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DataSheet.in
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
Voltage 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 1 mV can be resolved and
detected reliably without requiring amplification. Sensor or detector
signals with signal power as low as 0.004 pW(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
outputs 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 50 mA. 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.
ORDERING INFORMATION
Operating Temperature Range*
0°C to +70°C
0°C to +70°C
-55°C to +125°C
16-pin
Small Outline Package
(SOIC)
16-Pin
Plastic DIP Package
(PDIP)
16-Pin
Ceramic DIP Package
(CDIP)
ALD2321ASC
ALD2321BSC
ALD2321SC
ALD2321APC
ALD2321BPC
ALD2321PC
ALD2321ADC
ALD2321BDC
ALD2321DC
PRODUCT FEATURES
* Ultra low signal power of 4 fW detectable
* Ultra low offset voltage of max. 0.2 mV
* Ultra low input bias currents of typ. 0.01pA
* Low supply current of 110 µA typical
* Virtually eliminates source impedance effects
* Low operating supply voltage of 3V 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
* Low level signal detector
* 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*
1
2
3
4
5
6
7
8
16 V+
15 OUT2
14 OUT2H
13 -IN2
12 +IN2
11 VE21
10 VE22
9 N/C*
DC, PC, SC PACKAGE
*
*N/C pins are connected internally. Do not connect externally.
* Contact factory for industrial temperature range
© 2004 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com




Advanced Linear Devices

ALD2321 Datasheet Preview

ALD2321 Datasheet

ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR

No Preview Available !

DataSheet.in
GENERAL DESCRIPTION (cont'd)
The Source Output can source up to 2 mA 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 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. Con-
versely, 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
outputs, 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
ALD2321 PIN IDENTIFICATION
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 TYPI-
CAL APPLICATIONS section titled "Voltage Comparator
With Output Feedback to Provide Hysteresis."
In 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 necessary,
small valued capacitors of approximately 1000 pF 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
PIN # SYMBOL
FUNCTION
1
OUT1
COMPARATOR 1 SINK OUTPUT
2 OUT1H COMPARATOR 1 SOURCE OUTPUT
3 -IN1
COMPARATOR 1 INVERTING INPUT
4 +IN1 COMPARATOR 1 NON-INVERTING INPUT
5 GND GROUND / V- SUPPLY
6
VE11
- VOS E-Trim COMPARATOR 1
7
VE12
+ VOS E-Trim COMPARATOR 1
8 N/C
No Connect/Do Not connect externally
9 N/C
No Connect/Do Not connect externally
10 VE22
11 VE21
12 +IN2
13 -IN2
+VOS E-Trim COMPARATOR 2
- VOS E-Trim COMPARATOR 2
COMPARATOR 2 NON-INVERTING INPUT
COMPARATOR 2 INVERTING INPUT
14 OUT2H COMPARATOR 2 SOURCE OUTPUT
15 OUT2 COMPARATOR 2 SINK OUTPUT
16 V+
V+ SUPPLY
ALD2321A/ALD2321B
ALD2321
Advanced Linear Devices
SIGNAL PROPAGATION
OUTPUT
OUTPUT
INPUT
INPUT
-
INPUT
INPUT
-
-
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
-
2


Part Number ALD2321
Description ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR
Maker Advanced Linear Devices
Total Page 8 Pages
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