ALD ALD2321BPC Ultra low vos epad dual cmos analog voltage comparator Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD2321A/ALD2321B
ALD2321
ULTRA LOW VOS EPAD® DUAL CMOS ANALOG VOLTAGE COMPARATOR
GENERAL DESCRIPTION
PRODUCT FEATURES
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 onchip 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.
* 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
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.
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
1
16
V+
OUT1H
2
15
OUT2
-IN1
3
14
OUT2H
+IN1
4
13
-IN2
GND
5
12
+IN2
VE11
6
11
VE21
ORDERING INFORMATION
Operating Temperature Range*
0°C to +70°C
0°C to +70°C
-55°C to +125°C
VE12
7
10
VE22
16-pin
Small Outline Package
(SOIC)
16-Pin
Plastic DIP Package
(PDIP)
16-Pin
Ceramic DIP Package
(CDIP)
N/C*
8
9
N/C*
ALD2321ASC
ALD2321BSC
ALD2321SC
ALD2321APC
ALD2321BPC
ALD2321PC
ALD2321ADC
ALD2321BDC
ALD2321DC
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
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. 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.
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 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
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
(16) V+
INVERTING INPUT
-IN 1 (3)
-
NONINVERTING INPUT
+IN 1 (4)
+
PIN #
SYMBOL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OUT1
OUT1H
-IN1
+IN1
GND
VE11
VE12
N/C
N/C
VE22
VE21
+IN2
-IN2
OUT2H
OUT2
V+
ALD2321A/ALD2321B
ALD2321
(1) OUT1
(7) VE12
(6) VE11
(5) GND
INVERTING INPUT
-IN 2 (13)
-
NONINVERTING INPUT
+IN 2 (12)
+
FUNCTION
(14) OUT2H
(15) OUT2
(10) VE22
(11) VE21
(8)
N/C
ALD2321 PIN IDENTIFICATION
(2) OUT1H
(9)
N/C
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
Advanced Linear Devices
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
2
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+
Differential input voltage range
Power dissipation
Operating temperature range PC, SC package
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
V+
3
Supply Current
IS
Typ
110
50
2321B
Max
Min
10
3
180
Typ
110
150
50
2321
Max
Min
10
3
180
110
V
180
µA
No Load
Two Comparators
mV
RLOAD ≥ 1.5KΩ
0.01
20
pA
0.01
20
pA
V+ -1.5
V
0.4
V
VOS
0.05
0.2
0.2
0.5
0.5
Input Offset Current 1
IOS
0.01
20
0.01
20
Input Bias Current1
IB
0.01
20
0.01
20
V+ -1.5
10
Test Conditions
1.0
Input Offset Voltage
150
Common Mode Input
2
Voltage Range
VICR
Low Level Sink
Output Voltage
VOL
Low Level Sink
Output Current
IOL
24
50
24
50
24
50
mA
High Level Source
Output Voltage
VOH
3.5
4.5
3.5
4.5
3.5
4.5
V
ISOURCE = -2mA
SOURCE OUTPUT ON
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
Response Time2
tRP
1.1
1.1
1.1
µs
RL = 5.1KΩ, C L = 15pF
5mV Input Step/
0mV Overdrive
tRP
2.4
2.4
2.4
µs
RL = 5.1KΩ ,C L =15pF
1mVInput Step/
0mV Overdrive
0.15
-0.3
Unit
RLOAD ≥ 15K
AVD
V+ -1.5
50
Max
V/mV
Voltage Gain
-0.3
150
Typ
0.4
0.15
-0.3
0.4
0.15
ISINK = 12mA
VINPUT = 1V Differential
VOL = 1.0 V
SINK OUTPUT ON
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
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs.TEMPERATURE
200
180
+
180
V = +5V
No Load
Two Comparators
160
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
200
140
120
100
80
No Load
Two Comparators
160
TA = -550C
140
120
TA = 250C
100
80
60
TA = 1250C
40
20
0
60
-55
-25
25
0
50
75
100
0
125
2
AMBIENT TEMPERATURE (°C)
INPUT BIAS CURRENT vs. TEMPERATURE
V+ = +5V
100
10
1
-25
0
25
50
75
100
125
V+ = +3.5V
0.3
V+ = +5V
0.2
0.1
V+ = +10V
0.0
TA = 250C
TA = -250C
1.0
0.5
TA = -550C
0.0
0
15
30
45
60
75
100.0
VOH = V+
25
50
75
100
125
TA = 1250C
10.0
TA = 850C
1.0
0.1
TA = 250C
0.0
3
OUTPUT SINK CURRENT (mA)
ALD2321A/ALD2321B
ALD2321
0
-25
HIGH LEVEL OUTPUT VOLTAGE vs. HIGH
LEVEL OUTPUT LEAKAGE CURRENT
HIGH LEVEL OUTPUT CURRENT (nA)
OUTPUT SATURATION VOLTAGE (V)
TA = 1250C
TA = 850C
1.5
12
AMBIENT TEMPERATURE (°C)
3.0
2.0
10
ISINK = 12mA
VINPUT = 1V
Differential
0.4
-55
SATURATION VOLTAGE vs. SINK CURRENT
V+ = +5V
8
0.5
AMBIENT TEMPERATURE (0C)
2.5
6
LOW LEVEL OUTPUT VOLTAGE
vs. TEMPERATURE
LOW LEVEL OUTPUT VOLTAGE (V)
INPUT BIAS CURRENT (pA)
1000
0
-55
4
SUPPLY VOLTAGE (V)
Advanced Linear Devices
4
5
6
7
8
9
10
HIGH LEVEL OUTPUT VOLTAGE (V)
11
4
TYPICAL PERFORMANCE CHARACTERISTICS
INPUT OFFSET VOLTAGE vs. TEMPERATURE
10.0
8.0
INPUT OFFSET VOLTAGE (mV)
HIGH LEVEL OUTPUT VOTAGE (V)
HIGH LEVEL OUTPUT VOLTAGE vs.
TEMPERATURE
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
AMBIENT TEMPERATURE (°C)
6.0
RL = 5.1KΩ
+
V = +5V
RL = 5.1KΩ
OUTPUT VOLTAGE (V)
COMMON MODE REJECTION MODE
(dB)
25
50
75
100
125
RESPONSE TIME FOR VARIOUS INPUT
OVERDRIVES
90.0
85.0
0
AMBIENT TEMPERATURE (°C)
COMMON MODE REJECTION RATIO
vs. TEMPERATURE
80.0
75.0
70.0
5.0
CL = 15pF
Input Step
50mV
4.0
20mV
3.0
10mV
2.0
5mV 2mV
1mV
1.0
65.0
0.0
60.0
-55
-25
0
25
50
75
100
+
V = +5V
TIME (µS)
POWER SUPPLY REJECTION RATIO
(dB)
RESPONSE TIME FOR VARIOUS INPUT
OVERDRIVES
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
vs.TEMPERATURE
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
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
125
AMBIENT TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
+
V = +2.5V
1.2
Advanced Linear Devices
-25
0
25
50
75
100
AMBIENT TEMPERATURE (0C)
125
5
TYPICAL PERFORMANCE CHARACTERISTICS
COMMON - MODE VOLTAGE REFERRED
TO SUPPLY VOLTAGE
COMMON - MODE VOLTAGE LIMITS (V)
TRANSFER FUNCTION
OUTPUT VOLTAGE (V)
+6.0
TA = 25°C
VS = ±6V
0.0
-6.0
-2.5
0.5
-0.5
-1.0
≈
≈
0.5
V-0.5
-55
+2.5
0.0
VS = ± 2.5 V
V+
-25
0
DIFFERENTIAL INPUT VOLTAGE (mV)
50
75
100
125
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)
25
TEMPERATURE (°C)
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
PRECISION SINGLE SUPPLY VOLTAGE
COMPARATOR WITH DIRECT RELAY DRIVER
VOLTAGE COMPARATOR
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
TYPICAL APPLICATIONS
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-
-
VIN+
+
VOUT
VOUT
+10V
+
Q
-
1/2 ALD2321
VREF
0
VIN
+
-
ALD2321A/ALD2321B
ALD2321
Advanced Linear Devices
Q
1/2 ALD2321
7
TYPICAL APPLICATIONS
DUAL LIMIT WINDOW COMPARATOR
DUAL LIMIT PHOTO DETECTOR MONITOR
VExternal
V+
V+
1/2 ALD2321
+
VREF(HIGH)
BUZZER
RLOAD
1/2 ALD2321
LED
-
VLIMIT2
+
VOUT
-
+
VIN
VREF(LOW)
VLIMIT 1
LIGHT
1/2 ALD2321
-
RLOAD = 1.5KΩ
OUTPUT HIGH FOR VIN <VREF(HIGH)
AND 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
PINS OUT1, OUT1H, OUT2, OUT2H,
INTERNAL CIRCUIT CONFIGURATIONS
RESPONSE TIME MEASUREMENT CIRCUIT
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:
+5V
V+
OUT2
9KΩ
V+
OUT1
5.1KΩ
10X INPUT STEP
+
PHOTODETECTOR
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
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