ADVANCED
LINEAR
DEVICES, INC.
ALD2321A/ALD2321B/ALD2321
ULTRA LOW VOS EPAD® DUAL CMOS ANALOG VOLTAGE COMPARATOR
FEATURES
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 1mV can be resolved and detected reliably without requiring amplification. 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 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
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 Nchannel 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
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
•
•
•
•
•
•
•
•
•
•
•
•
•
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
1
16
V+
OUT1H
2
15
OUT2
-IN1
3
14
OUT2H
+IN1
4
13
-IN2
GND
5
12
+IN2
VE11
6
11
VE21
VE12
7
10
VE22
N/C*
8
9
N/C*
SCL, PCL, DC PACKAGES
*N/C pins are connected internally.
Do not connect externally.
* Contact factory for leaded (non-RoHS) or high temperature versions.
Rev 2.0 ©2010 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286
www.aldinc.com
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 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 etrim 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 necessary, 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
(16) V+
INVERTING INPUT
-IN 1 (3)
-
NONINVERTING INPUT
+IN 1 (4)
+
(2) OUT1H
(1) OUT1
(7) VE12
(6) VE11
(5) GND
INVERTING INPUT
-IN 2 (13)
-
NONINVERTING INPUT
+IN 2 (12)
+
(14) OUT2H
(15) OUT2
(10) VE22
(11) VE21
(8)
N/C
(9)
N/C
ALD2321 PIN IDENTIFICATION
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SYMBOL
OUT1
OUT1H
-IN1
+IN1
GND
VE11
VE12
N/C
N/C
VE22
VE21
+IN2
-IN2
OUT2H
OUT2
V+
FUNCTION
SIGNAL PROPAGATION
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
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
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
2 of 11
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+
Differential input voltage range
Power dissipation
Operating temperature range PCL, SCL packages
DC package
Storage temperature range
Lead temperature, 10 seconds
+10.6V
-0.3V to V+ +0.3V
600 mW
0°C to +70°C
-55°C to +125°C
-65°C to +150°C
+260°C
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25°C V+ = +5V unless otherwise specified
2321A
Parameter
Symbol
Min
Supply
Voltage
VS
V+
±2
4
Supply Current
Current
IS
Typ
110
Min
±5
10
±2
4
180
110
Min
±5
10
±2
4
180
110
VOS
0.05
0.2
0.2
0.5
0.5
Input Offset Current1
IOS
0.01
20
0.01
20
Input Bias Current1
IB
0.01
20
0.01
20
VOL
Low Level Sink
Output Current
IOL
V+ -1.5
-0.3
0.15
150
Typ
Input Offset Voltage
Low Level Sink
Output Voltage
50
2321
Max
AVD
VICR
150
Typ
Voltage Gain
Common Mode Input
2
Voltage Range
50
2321B
Max
V+ -1.5
-0.3
0.4
50
0.15
Unit
Test Conditions
±5
10
V
V
Dual Supply
Single Supply
180
µA
No Load
Two Comparators
150
V/mV
RLOAD ≥ 15K
1.0
mV
RLOAD ≥ 1.5KΩ
0.01
20
pA
0.01
20
pA
V+ -1.5
V
0.4
V
-0.3
0.4
Max
0.15
ISINK = 12mA
VINPUT = 1V Differential
24
50
24
50
24
50
mA
VOL = 1.0 V
SINK OUTPUT ON
3.5
4.5
3.5
4.5
3.5
4.5
V
ISOURCE = -2mA
SOURCE OUTPUT ON
High Level Source
Output Voltage
VOH
Source Output
Leakage Current
IHL
0.01
1
0.01
1
0.01
1
nA
VOH = 0.0V
SOURCE OUTPUT OFF
Sink Output
Leakage Current
IL
0.01
20
0.01
20
0.01
20
nA
VOUT = 5.0 V
SINK OUTPUT OFF
tRP
1.1
1.1
1.1
µs
RL = 5.1KΩ, CL = 15pF
5mV Input Step/
0mV Overdrive
tRP
2.4
2.4
2.4
µs
RL = 5.1KΩ ,CL =15pF
1mVInput Step/
0mV Overdrive
2
Response Time
Common Mode
Rejection Ratio
CMRR
80
80
80
dB
VINPUT = 0V to 2.5V
Power Supply
Rejection Ratio
PSRR
75
75
75
dB
V+ = 4V to 5V
Change of Vos / VExx
∆VOS
∆VE
5
5
5
mV/V
Notes:
1
2
VE pins No Load
Consists of junction leakage currents
Sample test parameter
ALD2321A/ALD2321B/ALD2321
Advanced Linear Devices
3 of 11
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT vs.TEMPERATURE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
200
V+ = +5V
No Load
Two Comparators
160
180
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
200
180
140
120
100
80
No Load
Two Comparators
160
TA = -550C
140
120
TA = 250C
100
80
60
TA = 1250C
40
20
60
0
-55
-25
25
0
50
75
100
125
0
2
4
INPUT BIAS CURRENT vs. TEMPERATURE
V+ = +5V
100
10
1
-25
0
25
50
75
100
125
V+ = +3.5V
0.3
+
0.2
V = +5V
0.1
V+ = +10V
0.0
-55
TA = 1250C
TA = 850C
TA = 250C
1.5
TA = -250C
1.0
0.5
TA = -550C
0.0
0
15
30
45
60
OUTPUT SINK CURRENT (mA)
ALD2321A/ALD2321B/ALD2321
75
50
100
125
75
HIGH LEVEL OUTPUT VOLTAGE vs. HIGH
LEVEL OUTPUT LEAKAGE CURRENT
HIGH LEVEL OUTPUT CURRENT (nA)
OUTPUT SATURATION VOLTAGE (V)
3.0
2.0
25
0
-25
AMBIENT TEMPERATURE (°C)
SATURATION VOLTAGE vs. SINK CURRENT
+
12
ISINK = 12mA
VINPUT = 1V
Differential
0.4
AMBIENT TEMPERATURE ( C)
V = +5V
10
0.5
0
2.5
8
LOW LEVEL OUTPUT VOLTAGE
vs. TEMPERATURE
LOW LEVEL OUTPUT VOLTAGE (V)
INPUT BIAS CURRENT (pA)
1000
0
-55
6
SUPPLY VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
100.0
VOH = V+
TA = 1250C
10.0
TA = 850C
1.0
0.1
TA = 250C
0.0
3
4
5
6
7
8
9
10
11
HIGH LEVEL OUTPUT VOLTAGE (V)
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4 of 11
TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
HIGH LEVEL OUTPUT VOLTAGE vs.
TEMPERATURE
INPUT OFFSET VOLTAGE vs. TEMPERATURE
8.0
INPUT OFFSET VOLTAGE (mV)
HIGH LEVEL OUTPUT VOTAGE (V)
10.0
IOH = -2mA
V+ = +10V
6.0
V+ = +5V
4.0
2.0
V+ = +4V
0.0
2.0
1.6
RL = 5.1KΩ
0.8
0.4
0.0
+
V = +5V
-0.4
-0.8
-1.2
-1.6
-2.0
-55
-25
0
25
50
75
100
125
-55
-25
25
50
75
100
125
RESPONSE TIME FOR VARIOUS INPUT
OVERDRIVES
90.0
6.0
+
OUTPUT VOLTAGE (V)
V = +5V
RL = 5.1KΩ
80.0
75.0
70.0
5.0
RL = 5.1KΩ
CL = 15pF
Input Step
50mV
4.0
20mV
3.0
10mV
2.0
5mV 2mV
1mV
1.0
65.0
0.0
0
V+ = +5V TA = 25 C
-1.0
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
60.0
-55
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
TIME (µS)
RESPONSE TIME FOR VARIOUS INPUT
OVERDRIVES
POWER SUPPLY REJECTION RATIO
vs.TEMPERATURE
6.0
5.0
1mV
4.0
RL = 5.1KΩ
CL = 15pF
Input Step
3.0
2.0
20mV
5mV
10mV
1.0
2mV
50mV
0.0
+
V = +5V TA = 250C
-1.0
0.0 0.3 0.6 0.9
1.2 1.5 1.8
2.1 2.4 2.7
3.0
POWER SUPPLY REJECTION RATIO
(dB)
COMMON MODE REJECTION MODE
(dB)
COMMON MODE REJECTION RATIO
vs. TEMPERATURE
85.0
0
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
+
V = +2.5V
1.2
90.0
V+ = +5V
RL = 5.1KΩ
85.0
80.0
75.0
70.0
65.0
60.0
-55
TIME (µS)
ALD2321A/ALD2321B/ALD2321
Advanced Linear Devices
-25
0
25
50
75
100
AMBIENT TEMPERATURE (0C)
125
5 of 11
TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
COMMON - MODE VOLTAGE REFERRED
TO SUPPLY VOLTAGE
COMMON - MODE VOLTAGE LIMITS (V)
TRANSFER FUNCTION
+6.0
OUTPUT VOLTAGE (V)
TA = 25°C
VS = ±6V
0.0
-6.0
-2.5
+2.5
0.0
0.5
V+
VS = ± 2.5 V
-0.5
-1.0
≈
≈
0.5
V-0.5
-55
-25
0
25
50
75
100
125
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE
vs. SUPPLY VOLTAGE
OUTPUT HIGH VOLTAGE
vs. SUPPLY VOLTAGE
V+ -0.6
0.6
OUTPUT LOW VOLTAGE (V)
OUTPUT HIGH VOLTAGE FROM V+ (V)
DIFFERENTIAL INPUT VOLTAGE (mV)
TA = 25°C
IOH = -2mA
V+ -0.5
V+ -0.4
V+ -0.3
V+ -0.2
V+ -0.1
TA = 25°C
IOL= 12mA
0.5
0.4
0.3
0.2
0.1
0.0
V+
2
4
6
8
SUPPLY VOLTAGE (V)
12
10
2
4
6
8
SUPPLY VOLTAGE (V)
10
12
TYPICAL APPLICATIONS
VOLTAGE COMPARATOR
PRECISION SINGLE SUPPLY VOLTAGE
COMPARATOR WITH DIRECT RELAY DRIVER
WITH +/-5V SUPPLY AND +5V RELAY DRIVE
+5
+5
+5
5VRELAY
VR
-
VIN-
-
VIN
+
VIN+
+
5VRELAY
1K
-5
ALD2321A/ALD2321B/ALD2321
Advanced Linear Devices
6 of 11
TYPICAL APPLICATIONS (cont'd)
VOLTAGE COMPARATOR WITH
VOLTAGE COMPARATOR WITH OUTPUT
COMPLEMENTARY OUTPUT DRIVERS
FEEDBACK TO PROVIDE HYSTERSIS
+5V
+5V
+5V
VIN-
VA= 1V to +30V
RLoad
+5V
RLoad1
=200Ω
RLoad2=1K
-
OUT
VR
VOUT
OUTH
VIN+
+
OUTH
2N2222
VE22
VIN
15K
2.2M
-5V
VOLTAGE COMPARATOR WITH +/-5V
VOLTAGE COMPARATOR WITH OUTPUT LEVEL
SUPPLY AND OUTPUT LEVEL SHIFT
SHIFT AND HIGH CURRENT LOAD DRIVER
+5V
+5V
+5V
+5V
100K
15K
VOUT
-
0.1µF
+5V
+
15K
R1= 15K
VOUT
-
VOUT
0.066V
VOUT
100K
VINVIN+
0
200Ω
R2=50
+
RLoad
0.1µF
-4V
-5V
-5V
VOLTAGE COMPARATOR WITH SINGLE
VOLTAGE COMPARATOR WITH
SUPPLY AND OUTPUT LEVEL SHIFT
COMPLEMENTARY OUTPUTS
VA= 0V to +10V
V+
+5V
VIN-
-
VOUT
VOUT
+10V
VIN+
+
Q
-
1/2 ALD2321
VREF
+
0
VIN
+
-
ALD2321A/ALD2321B/ALD2321
Advanced Linear Devices
Q
1/2 ALD2321
7 of 11
TYPICAL APPLICATIONS (cont'd)
DUAL LIMIT WINDOW COMPARTOR
DUAL LIMIT PHOTO DETECTOR MONTOR
VExternal
V+
V+
1/2 ALD2321
VREF(HIGH)
BUZZER
RLOAD
+
1/2 ALD2321
LED
-
VLIMIT2
+
VOUT
-
+
VIN
VREF(LOW)
VLIMIT 1
LIGHT
-
+
PHOTODETECTOR
1/2 ALD2321
-
RLOAD = 1.5KΩ
OUTPUT HIGH FOR VIN VREF(LOW)
1/2 ALD2321
LED turns on as photo-detector
voltage reaches VLIMIT1.
Both LED and horn turns on as photodetector voltage reachesVLIMIT2.
VEXTERNAL= +12V, V+ = +5V
RESPONSE TIME MEASUREMENT CIRCUIT
PINS OUT1, OUT1H, OUT2, OUT2H,
INTERNAL CIRCUIT CONFIGURATIONS
Response time is defined as the internal between the
application of an input step function and the instant
when the output reaches 50% of its maximum value
as measured by the following test circuit:
V+
+5V
OUT1
OUT2
5.1KΩ
10X INPUT STEP
9KΩ
V+
OUT1H
OUT2H
OUT1
OUT2
OUT
+
VIN
1KΩ
E-TRIM CIRCUIT
-IN
-
+IN
+
VE1x*
Level
Shift/
Scaling
Input
Offset
Trim
Circuit
VE2x*
Level
Shift/
Scaling
Input
Offset
Trim
Circuit
OUTH
OUT
* These pins should be isolated by surrounding them with ground trace in user's applications.
ALD2321A/ALD2321B/ALD2321
Advanced Linear Devices
8 of 11
SOIC-16 PACKAGE DRAWING
16 Pin Plastic SOIC Package
E
Millimeters
S (45°)
D
Dim
Min
A
1.35
Max
1.75
0.053
Max
0.069
A1
0.10
0.25
0.004
0.010
b
0.35
0.45
0.014
0.018
C
0.18
0.25
0.007
0.010
D-16
9.80
10.00
0.385
0.394
E
3.50
4.05
0.140
0.160
A1
e
Min
1.27 BSC
e
A
Inches
0.050 BSC
H
5.70
6.30
0.224
0.248
L
0.60
0.937
0.024
0.037
ø
0°
8°
0°
8°
S
0.25
0.50
0.010
0.020
b
S (45°)
H
L
ALD2321A/ALD2321B/ALD2321
C
ø
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9 of 11
PDIP-16 PACKAGE DRAWING
16 Pin Plastic DIP Package
E
E1
Millimeters
Dim
D
S
A2
A1
e
b
A
L
Inches
A
Min
3.81
Max
5.08
Min
0.105
Max
0.200
A1
0.38
1.27
0.015
0.050
A2
1.27
2.03
0.050
0.080
b
0.89
1.65
0.035
0.065
b1
0.38
0.51
0.015
0.020
c
0.20
0.30
0.008
0.012
D-16
18.93
21.33
0.745
0.840
E
5.59
7.11
0.220
0.280
E1
7.62
8.26
0.300
0.325
e
2.29
2.79
0.090
0.110
e1
L
7.37
7.87
0.290
0.310
2.79
3.81
0.110
0.150
S-16
0.38
1.52
0.015
0.060
ø
0°
15°
0°
15°
b1
c
e1
ø
ALD2321A/ALD2321B/ALD2321
Advanced Linear Devices
10 of 11
CERDIP-16 PACKAGE DRAWING
16 Pin CERDIP Package
Millimeters
E E1
D
A1
s
A
L
L2
b
L1
Inches
Dim
A
Min
3.55
Max
5.08
Min
0.140
Max
0.200
A1
1.27
2.16
0.050
0.085
b
0.97
1.65
0.038
0.065
b1
0.36
0.58
0.014
0.023
C
0.20
0.38
0.008
0.015
D-16
--
21.34
--
0.840
E
5.59
7.87
0.220
0.310
E1
7.73
8.26
0.290
0.325
e
2.54 BSC
0.100 BSC
e1
7.62 BSC
0.300 BSC
L
3.81
5.08
0.150
0.200
L1
3.18
--
0.125
--
L2
0.38
1.78
0.015
0.070
S
--
2.49
--
0.098
Ø
0°
15°
0°
15°
b1
e
C
e1
ALD2321A/ALD2321B/ALD2321
ø
Advanced Linear Devices
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