ALD2321 [ALD]
ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR; 超低VOS EPAD双CMOS模拟电压比较器
| 型号： | ALD2321 |
| 厂家： | 
ADVANCED LINEAR DEVICES |
| 描述： | ULTRA LOW VOS EPAD DUAL CMOS ANALOG VOLTAGE COMPARATOR |
| 文件： | 总8页 (文件大小：64K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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 on-
* 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
®
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
impedancesources.FormanyapplicationstheALD2321A/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.
* High output sink current - typically 50mA
* Low supply current spikes
Theinputvoltageincludesground,makingthisvoltagecomparatorideal
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,makingtheALD2321A/ALD2321B/ALD2321atitsbestoffset
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
* 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
detected reliably without requiring amplification. Sensor or detector
-15
signals with signal power as low as 0.004 pW(4 x 10
readily detected.
Watt) can be
PIN CONFIGURATION
Each voltage comparator has two complementary output pins, one for
Source Output (OUT )and the other for Sink Output (OUT). This dual
H
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
capabilityofupto50mA. Itcanalsobeconnectedtoanexternalvoltage
higher or lower than V+, which provide level shift of the output swing
levels from other than V+ to GND.
+
1
2
3
4
5
6
OUT
16
15
14
13
12
11
V
1
OUT
OUT
1H
2
OUT
-IN
2H
1
-IN
2
+IN
1
ORDERING INFORMATION
GND
+IN
VE
2
Operating Temperature Range*
VE
11
21
0°C to +70°C
0°C to +70°C
-55°C to +125°C
7
8
10
9
VE
VE
12
*
22
*
N/C
16-pin
16-Pin
16-Pin
N/C
Small Outline Package
(SOIC)
Plastic DIP Package
(PDIP)
Ceramic DIP Package
(CDIP)
DC, PC, SC PACKAGE
ALD2321ASC
ALD2321BSC
ALD2321SC
ALD2321APC
ALD2321BPC
ALD2321PC
ALD2321ADC
ALD2321BDC
ALD2321DC
*N/C pins are connected internally. Do not connect externally.
* Contact factory for industrial temperature range
© 2004 Advanced Linear Devices, Inc. 415Tasman Drive, Sunnyvale, California 94089 -1706Tel:(408) 747-1155 Fax:(408) 747-1286 http://www.aldinc.com
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."
GENERAL DESCRIPTION (cont'd)
The Source Output can source up to 2 mA and can be used to
drivethebaseterminalofanexternalNPNbipolardeviceorthe
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 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.
Inthedualcomplementaryoutputmode, eachcomparatorcan
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
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.
the OUT pin is OFF and in high impedance mode. Con-
H
versely, if OUT pin is ON and sourcing current, OUT pin is
H
OFF. To configure push-pull output, simply connect OUT (sink
output) pin to OUT pin.
H
Since each voltage comparator has its own complementary
outputs,eachcomparatorcanbeconfiguredtohaveadifferent
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
essentiallyleakagecurrentlevels,whichcanbeapowersaving
feature.
BLOCK DIAGRAM
+
(16) V
INVERTING INPUT
-
(2) OUT
1H
-IN (3)
1
(1) OUT
1
NONINVERTING INPUT
+
+IN (4)
1
(7)
VE
12
The ALD2321A/ ALD2321B/ ALD2321 can detect and resolve
very low voltage levels at high speed, with little or no overdrive
voltage. Comparedwithothervoltagecomparatordevicesthat
require 100 mV overdrive voltages, or multiple stage circuits
that include input preamp, etc., the ALD2321A/ ALD2321B/
ALD2321canperformallinputtooutputfunctionsinonedevice
with minimal delay time and with as low as a 1mV signal.
(6)
VE
11
(5)
GND
INVERTING INPUT
(14) OUT
-
2H
-IN (13)
2
(15) OUT
2
NONINVERTING INPUT
+
The ALD2321A/ ALD2321B/ ALD2321 is supplied with 4
external e-trim pins, VE11, VE12, VE21 and VE22. These pins
areusedfortrimmingofthevoltagecomparatoroffsetvoltages
+IN (12)
2
(10)
VE
22
(11)
VE
21
(8)
(9)
ALD2321 PIN IDENTIFICATION
N/C
N/C
PIN #
SYMBOL
FUNCTION
SIGNAL PROPAGATION
1
2
3
4
OUT
OUT
COMPARATOR 1 SINK OUTPUT
COMPARATOR 1 SOURCE OUTPUT
COMPARATOR 1 INVERTING INPUT
COMPARATOR 1 NON-INVERTING INPUT
GROUND / V- SUPPLY
OUTPUT
OUTPUT
INPUT
INPUT
-
1
1H
-IN
1
+IN
1
GND
5
6
7
8
9
10
11
12
13
14
15
16
VE
VE
N/C
N/C
VE
VE
+IN
-IN
OUT
OUT
V+
- 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
INPUT
INPUT
-
11
12
-
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
-
22
21
2
2
2H
2
ALD2321A/ALD2321B
ALD2321
Advanced Linear Devices
2
ABSOLUTE MAXIMUM RATINGS
+
Supply voltage, V
+10.6V
-0.3V to V +0.3V
+
Differential input voltage range
Power dissipation
600 mW
Operating temperature range PC, SC package
DC package
Storage temperature range
Lead temperature, 10 seconds
0°C to +70°C
-55°C to +125°C
-65°C to +150°C
+260°C
OPERATING ELECTRICAL CHARACTERISTICS
+
T
= 25°C V = +5V unless otherwise specified
A
2321A
2321B
Typ
2321
Typ
Parameter
Symbol Min
Typ
Max
Min
Max
Min
Max
10
Unit
Test Conditions
+
Supply Voltage
V
3
10
3
10
3
V
Supply Current
I
110
150
180
110
150
180
110
150
180
µA
No Load
Two Comparators
S
Voltage Gain
A
50
50
50
V/mV
R
≥ 15K
VD
LOAD
Input Offset Voltage
Input Offset Current1
Input Bias Current1
V
I
0.05
0.01
0.01
0.2
20
20
0.2
0.5
20
20
0.5
1.0
20
20
mV
pA
pA
R
LOAD
≥ 1.5KΩ
OS
OS
0.01
0.01
0.01
0.01
I
B
+
+
+
V -1.5
Common Mode Input
Voltage Range2
V
-0.3
V
-1.5 -0.3
V
-1.5 -0.3
V
V
ICR
Low Level Sink
Output Voltage
V
0.15
50
0.4
0.15
50
0.4
0.15
50
0.4
I
V
= 12mA
OL
SINK
= 1V Differential
INPUT
Low Level Sink
Output Current
I
24
24
24
mA
V
V
= 1.0 V
OL
OL
SINK OUTPUT ON
High Level Source
Output Voltage
V
I
= -2mA
OH
3.5
4.5
3.5
4.5
3.5
4.5
SOURCE
SOURCE OUTPUT ON
Source Output Leakage
Current
I
V
HL
0.01
0.01
1
0.01
0.01
1
0.01
0.01
1
nA
nA
OH = 0.0V
SOURCE OUTPUT OFF
Sink Output Leakage
Current
I
20
20
20
V
= 5.0 V
L
OUT
SINK OUTPUT OFF
Response Time2
t
1.1
2.4
1.1
2.4
1.1
2.4
µs
µs
R = 5.1KΩ, C = 15pF
L L
5mV Input Step/
0mV Overdrive
RP
RP
t
R
L
= 5.1KΩ ,C =15pF
L
1mVInput Step/
0mV Overdrive
Common Mode
Rejection Ratio
CMRR
80
75
80
75
80
75
dB
dB
V
= 0V to 2.5V
INPUT
Power Supply Rejection PSRR
Ratio
+
V = 4V to 5V
mV/V
Change of Vos / VExx
∆V
OS
∆V
E
5
5
5
V
E
pins No Load
1
Notes:
Consists of junction leakage currents
Sample test parameter
2
ALD2321A/ALD2321B
ALD2321
Advanced Linear Devices
3
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs.TEMPERATURE
200
180
160
140
120
100
200
180
+
No Load
Two Comparators
V
= +5V
No Load
Two Comparators
T
= -550C
= 250C
160
140
120
A
T
A
80
60
100
80
T
= 1250C
40
20
0
A
60
0
2
4
6
8
10
12
-55 -25
25
50
75
100
125
0
SUPPLY VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
INPUT BIAS CURRENT vs. TEMPERATURE
LOW LEVEL OUTPUT VOLTAGE
vs. TEMPERATURE
1000
100
10
1
0.5
0.4
+
I
SINK = 12mA
V
= +5V
V
1V
INPUT =
Differential
+
V
= +3.5V
0.3
0.2
0.1
0.0
+
V
= +5V
+
V
= +10V
75
0
-55
-25
0
25
50
75
100
125
-55
25
125
0
50
-25
100
AMBIENT TEMPERATURE (0C)
AMBIENT TEMPERATURE (°C)
HIGH LEVEL OUTPUT VOLTAGE vs. HIGH
LEVEL OUTPUT LEAKAGE CURRENT
SATURATION VOLTAGE vs. SINK CURRENT
3.0
2.5
2.0
1.5
100.0
10.0
1.0
+
V
= V
OH
+
T
= 1250C
A
V
= +5V
T
= 1250C
A
T
= 850C
A
T
= 850C
T
= 250C
A
A
T
= -250C
A
1.0
0.5
0.1
T
= 250C
10
T
= -550C
A
A
0.0
0.0
0
75
60
OUTPUT SINK CURRENT (mA)
15
30
45
3
4
5
6
7
8
9
11
HIGH LEVEL OUTPUT VOLTAGE (V)
ALD2321A/ALD2321B
ALD2321
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
HIGH LEVEL OUTPUT VOLTAGE vs.
INPUT OFFSET VOLTAGE vs. TEMPERATURE
TEMPERATURE
10.0
8.0
6.0
4.0
2.0
0.0
2.0
1.6
R
L
= 5.1KΩ
+
IOH = -2mA
V
= +2.5V
+
1.2
0.8
0.4
V
= +10V
+
V
= +5V
0.0
-0.4
-0.8
-1.2
-1.6
+
V
= +5V
+
V
= +4V
0
-2.0
-55
-25
25
50
75
100
125
-55
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
COMMON MODE REJECTION RATIO
vs. TEMPERATURE
RESPONSE TIME FOR VARIOUS INPUT
OVERDRIVES
90.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
-1.0
C
= 15pF Input Step
+
R
= 5.1KΩ
L
L
V
R
= +5V
= 5.1KΩ
85.0
80.0
L
50mV
20mV
10mV
75.0
70.0
65.0
60.0
5mV
2mV
1mV
T
= 250C
+
V
= +5V
A
-55
0
25
50
75
100
125
-25
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
AMBIENT TEMPERATURE (°C)
TIME (µS)
RESPONSE TIME FOR VARIOUS INPUT
OVERDRIVES
POWER SUPPLY REJECTION RATIO
vs.TEMPERATURE
6.0
5.0
4.0
90.0
+
V
= +5V
= 5.1KΩ
85.0
80.0
75.0
70.0
65.0
60.0
1mV
R
L
R
L
= 5.1KΩ
3.0
2.0
1.0
0.0
C
= 15pF
L
20mV
50mV
5mV
Input Step
10mV
2mV
+
T
= +5V
= 250C
V
A
-1.0
0.6 0.9
1.5 1.8 2.1
2.7
2.4
0.0 0.3
1.2
3.0
-55
-25
0
25
50
75
100
0
125
TIME (µS)
AMBIENT TEMPERATURE ( C)
ALD2321A/ALD2321B
ALD2321
Advanced Linear Devices
5
TYPICAL PERFORMANCE CHARACTERISTICS
COMMON - MODE VOLTAGE REFERRED
TO SUPPLY VOLTAGE
TRANSFER FUNCTION
0.5
V+
+6.0
0.0
V
= ± 2.5 V
T
V
= 25°C
= ±6V
S
A
S
-0.5
-1.0
≈
≈
0.5
V-
-6.0
-0.5
-55
-25
0
25
50
75
100 125
-2.5
+2.5
0.0
TEMPERATURE (°C)
DIFFERENTIAL INPUT VOLTAGE (mV)
OUTPUT LOW VOLTAGE
vs. SUPPLY VOLTAGE
OUTPUT HIGH VOLTAGE
vs. SUPPLY VOLTAGE
+
V
-0.6
-0.5
-0.4
0.6
0.5
T
= 25°C
T
= 25°C
A
A
+
V
I
OL
= 12mA
I
OH
= -2mA
+
0.4
0.3
0.2
V
+
V
-0.3
-0.2
+
V
+
0.1
0.0
V
-0.1
+
V
2
4
10
12
6
8
2
4
10
12
6
8
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TYPICAL APPLICATIONS
PRECISION SINGLE SUPPLY VOLTAGE
VOLTAGE COMPARATOR
COMPARATOR WITH DIRECT RELAY DRIVER
WITH +/-5V SUPPLY AND +5V RELAY DRIVE
+5
+5
+5
5V
RELAY
-
V
IN
-
5V
RELAY
V
R
-
+
V
IN
+
1K
V
IN
+
-5
ALD2321A/ALD2321B
ALD2321
Advanced Linear Devices
6
TYPICAL APPLICATIONS
VOLTAGE COMPARATOR WITH
COMPLEMENTARY OUTPUT DRIVERS
VOLTAGE COMPARATOR WITH OUTPUT
FEEDBACK TO PROVIDE HYSTERSIS
+5V
+5V
V = 1V to +30V
A
R
Load
+5V
OUT
OUT
+5V
R
Load1
=200Ω
R =1K
Load2
-
V
V
V
IN
R
-
V
OUT
H
V
+
2N2222
E22
V
IN
+
IN
OUT
H
15K
2.2M
-5V
VOLTAGE COMPARATOR WITH OUTPUT LEVEL
SHIFT AND HIGH CURRENT LOAD DRIVER
VOLTAGE COMPARATOR WITH +/-5V
SUPPLY AND OUTPUT LEVEL SHIFT
+5V
+5V
+5V
+5V
R = 15K
1
100K
0.1µF
15K
V
OUT
-
V
V
V
OUT
IN
-
OUT
+5V
-
0.066V
V
OUT
200Ω
+
R =50
2
V
+
IN
+
15K
0
100K
R
Load
-4V
0.1µF
-5V
-5V
VOLTAGE COMPARATOR WITH SINGLE
SUPPLY AND OUTPUT LEVEL SHIFT
VOLTAGE COMPARATOR WITH
COMPLEMENTARY OUTPUTS
V = 0V to +10V
A
+
V
+
-
Q
+5V
-
V
V
OUT
1/2 ALD2321
IN
-
V
OUT
+10V
V
REF
+
V
IN
+
+
-
0
V
IN
Q
1/2 ALD2321
ALD2321A/ALD2321B
ALD2321
Advanced Linear Devices
7
TYPICAL APPLICATIONS
DUAL LIMIT WINDOW COMPARATOR
DUAL LIMIT PHOTO DETECTOR MONITOR
V
External
V+
+
V
1/2 ALD2321
BUZZER
R
LOAD
V
+
-
REF(HIGH)
1/2 ALD2321
LED
V
LIMIT2
+
V
OUT
-
+
-
V
IN
V
LIMIT 1
LIGHT
+
V
REF(LOW)
PHOTO-
DETECTOR
1/2 ALD2321
-
R
= 1.5KΩ
LOAD
OUTPUT HIGH FOR V <V
1/2 ALD2321
IN
REF(LOW)
REF(HIGH)
LED turns on as photo-detector
voltage reaches V 1.
AND V > V
IN
LIMIT
Both LED and horn turns on as photo-
detector voltage reachesV 2.
LIMIT
= +12V, V+ = +5V
V
EXTERNAL
RESPONSE TIME MEASUREMENT CIRCUIT
PINS OUT OUT
1,
OUT OUT
2, 2H,
1H,
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
V
+5V
OUT
OUT
1
2
OUT
OUT
OUT
1H
2H
5.1KΩ
10X INPUT STEP
OUT
-
1
2
9KΩ
OUT
V
IN
+
1KΩ
E-TRIM CIRCUIT
-IN
-
OUT
H
OUT
+
+IN
Input
Level
Offset
Trim
Circuit
Shift/
Scaling
VE
VE
*
*
1x
Input
Level
Offset
Shift/
Scaling
2x
Trim
Circuit
* 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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