MAX9022 [MAXIM]
Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators; 微功耗，超小型，单/双/四路，单电源比较器
| 型号： | MAX9022 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Micropower, Ultra-Small, Single/Dual/Quad, Single-Supply Comparators |
| 文件： | 总8页 (文件大小：354K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1842; Rev 1; 7/01
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
General Description
Features
The MAX9021/MAX9022/MAX9024 single/dual/quad
comparators are optimized for low-power consumption
while still providing a fast output response. They are
designed for single-supply applications from 2.5V to
5.5V, but can also operate from dual supplies. These
comparators have a 3µs propagation delay and con-
sume 2.8µA of supply current per comparator over the
-40°C to +125°C operating temperature range. The
combination of low-power, single-supply operation
down to 2.5V, and ultra-small footprint makes these
devices ideal for portable applications.
ꢀ Low-Cost Solution Available in Space-Saving
SC70 Packages (Half the Size of SOT23)
ꢀ Low 2.8µA Supply Current
ꢀ 3µs Propagation Delay
ꢀ Internal 4mV Comparator Hysteresis
ꢀ Comparator Output Swings Rail-to-Rail®
ꢀ 2.5 to 5.5V Single-Supply Voltage Range
ꢀ No Phase Reversal for Overdriven Inputs
The MAX9021/MAX9022/MAX9024 have 4mV of built-in
hysteresis to provide noise immunity and prevent oscil-
lations even with a slow-moving input signal. The input
common-mode range extends from the negative supply
to within 1.1V of the positive supply. The design of the
comparator-output stage substantially reduces switch-
ing current during output transitions, eliminating power-
supply glitches.
ꢀ Space-Saving Packages
5-Pin SC70 (MAX9021)
8-Pin SOT23 (MAX9022)
8-Pin µMAX (MAX9022)
14-Pin TSSOP (MAX9024)
Ordering Information
The MAX9021 single comparator is available in tiny 5-
pin SC70 and SOT23 packages. The MAX9022 dual
comparator is available in 8-pin SOT23, µMAX, and SO
packages, and the MAX9024 quad comparator is avail-
able in 14-pin TSSOP and SO packages.
PART
TEMP RANGE
PIN-PACKAGE
5 SC70-5
5 SOT23-5
8 SOT23-8
8 µMAX
MAX9021AXK-T -40°C to +125°C
MAX9021AUK-T -40°C to +125°C
MAX9022AKA-T -40°C to +125°C
Applications
MAX9022AUA
MAX9022ASA
MAX9024AUD
MAX9024ASD
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Battery-Powered
Portable Systems
Digital Line Receivers
Keyless Entry Systems
8 SO
14 TSSOP
14 SO
Mobile Communications
Sensor-Signal Detection
Photodiode Preamps
Threshold Detectors/
Discriminators
Typical Application Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
OUTA
INA-
1
2
3
4
5
6
7
14 OUTD
13 IND-
12 IND+
OUTA
INA-
1
2
3
4
8
7
6
5
V
DD
IN+
1
2
3
5
4
V
DD
OUTB
INB-
MAX9021
MAX9022
INA+
V
SS
INA+
V
11
V
SS
MAX9024
DD
V
INB+
SS
INB+
INB-
10 INC+
IN-
OUT
9
8
INC-
S0T23/µMAX/SO
SC70/SOT23
OUTB
OUTC
TSSOP/SO
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
to V ) ....................................-0.3V to +6V
8-Pin µMAX (derate 4.5mW/°C above +70°C)..............362mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........727mW
14-Pin SO (derate 8.3mW/°C above +70.......................667mW
Operating Temperature Range
DD
SS
Voltage Inputs (IN+, IN- to V ). ................-0.3V to (V
+ 0.3V)
SS
DD
Differential Input Voltage (IN+ to IN-)....................................6.6V
Output Short-Circuit Duration ..................2s to Either V or V
Current into Any Pin ............................................................20mA
DD
SS
Continuous Power Dissipation (T = +70°C)
Automotive Application...................................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
A
5-Pin SC70 (derate 3.1mW/°C above +70°C)...............247mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C).............727mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= 5V, V = 0, V
= 0, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
DD
SS
CM
A
A
PARAMETER
SYMBOL
CONDITIONS
Guaranteed by PSRR test
MIN
TYP
MAX
5.5
5
UNITS
V
2.5
Operating Voltage Range
Supply Current Per Comparator
Input Offset Voltage
V
DD
DD
I
2.8
1
µA
V
(Note 2)
8
mV
OS
Input Offset Voltage
Temperature Coefficient
TCV
1
µV/°C
OS
Hysteresis
(Note 3)
4
3
2
mV
nA
nA
V
Input Bias Current
Input Offset Current
I
80
60
BIAS
I
OS
Common-Mode Voltage Range
Common-Mode Rejection Ratio
V
Guaranteed by CMRR test
V
V
- 1.1
CM
SS
DD
CMRR
PSRR
V
SS
≤ V ≤ (V - 1.1V), V = 5.5V
70
60
100
80
dB
CM
DD
DD
Power-Supply Rejection Ratio
V
= 2.5V to 5.5V
dB
DD
I
I
I
I
= 10µA
= 4mA
2
160
2
SOURCE
SOURCE
V
(V
= V
- V
DD OUT,
OH
- V ) ≥ 20mV
IN-
400
400
IN+
Output-Voltage Swing
V
, V
mV
OL OH
= 10µA
SINK
SINK
V
= V
- V
OL
OUT SS,
(V - V ) ≥ 20mV
IN-
IN+
= 4mA
180
50
8
Output Short-Circuit Current
Propagation Delay
I
mA
µs
SC
V
V
= 10mV
R = 10kΩ,
C = 15pF (Note 4)
OD
OD
L
t
, t
-
pd+ pd
L
= 100mV
3
Rise and Fall Time
Power-On Time
t , t
R = 10kΩ, C = 15pF (Note 5)
20
150
150
ns
ns
pF
R
F
L
L
R = 10kΩ, C = 15pF
L
L
Maximum Capacitive Load
C
No sustained oscillations
L
Note 1: All devices are production tested at 25°C. All temperature limits are guaranteed by design.
Note 2: Comparator Input Offset is defined as the center of the hysteresis zone.
Note 3: Hysteresis is defined as the difference of the trip points required to change comparator output states.
Note 4: V is the overdrive voltage beyond the offset and hysteresis-determined trip points.
OD
Note 5: Rise and fall times are measured between 10% and 90% at OUT.
2
_______________________________________________________________________________________
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Typical Operating Characteristics
(V
= 5V, V = 0, V
= 0, R = 10kΩ, C = 15pF, V
= 100mV, T = +25°C, unless otherwise noted.)
DD
SS
CM
L
L
OD A
SUPPLY CURRENT
vs. OUTPUT TRANSITION FREQUENCY
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
1000
3.0
2.9
2.8
2.7
2.6
3.0
2.9
2.8
2.7
2.6
2.5
100
10
1
10
100
0.01
0.1
1
1000
2
3
4
5
6
-50 -25
0
25
50
75 100 125
OUTPUT TRANSITION FREQUENCY (kHz)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
500
400
300
200
100
0
500
400
300
200
100
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-50 -25
0
25
50
75 100 125
0
2
4
6
8
10
0
2
4
6
8
10
TEMPERATURE (°C)
SOURCE CURRENT (mA)
SINK CURRENT (mA)
PROPAGATION DELAY vs. CAPACITIVE LOAD
PROPAGATION DELAY vs. CAPACITIVE LOAD
OUTPUT SHORT-CIRCUIT CURRENT
vs. TEMPERATURE
(V = 5V)
DD
(V = 2.7V)
DD
5
4
5
4
3
65
60
55
50
45
40
t
-
PD
3
2
1
0
t
-
PD
SOURCE CURRENT
2
1
0
t
+
t +
PD
PD
SINK CURRENT
1500
CAPACITIVE LOAD (pF)
2000
0
500
1000
1500
CAPACITIVE LOAD (pF)
2000
0
500
1000
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Typical Operating Characteristics (continued)
(V
= 5V, V = 0, V
= 0, R = 10kΩ, C = 15pF, V
= 100mV, T = +25°C, unless otherwise noted.)
DD
SS
CM
L
L
OD
A
PROPAGATION DELAY
vs. INPUT OVERDRIVE VOLTAGE
PROPAGATION DELAY
vs. TEMPERATURE
PROPAGATION DELAY (t
)
PD+
9
8
7
6
5
4
3
2
1
0
5
4
3
2
1
0
IN+
t
-
PD
100mV/div
t
-
PD
V
t
PD
+
OUT
2.5V/div
t
+
PD
0
20
40
60
80 100 120 140
1µs/div
-50 -25
0
25
50
75 100 125
INPUT OVERDRIVE VOLTAGE (mV)
TEMPERATURE (°C)
OUTPUT SWITCHING CURRENT, RISING
OUTPUT SWITCHING CURRENT, FALLING
PROPAGATION DELAY (t
)
PD-
IN+ - IN -
200mV/div
IN+ - IN-
200mV/div
IN+
100mV/div
V
V
OUT
5V/div
OUT
5V/div
V
OUT
2.5V/div
SWITCHING
CURRENT
400µA/div
SWITCHING
CURRENT
400µA/div
20µs/div
20µs/div
1µs/div
10kHz RESPONSE
(V = 100mV)
OD
10kHz RESPONSE
(V = 10mV)
OD
POWER-UP TIME
V
IN+ - IN-
100mV/div
IN+ - IN -
10mV/div
DD
2.5V/div
V
OUT
2.5V/div
OUT
2.5V/div
OUT
2.5V/div
2µs/div
10µs/div
10µs/div
4
_______________________________________________________________________________________
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Pin Description
PIN
NAME
FUNCTION
MAX9021
MAX9022
MAX9024
1
—
4
—
11
—
—
4
IN+
Comparator Noninverting Input
Negative Supply Voltage
Comparator Inverting Input
Comparator Output
2
V
SS
3
—
—
8
IN-
4
OUT
5
V
Positive Supply Voltage. Bypass with a 0.1µF capacitor to GND.
Comparator A Output
DD
—
—
—
—
—
—
—
—
—
—
—
—
1
1
OUTA
INA-
2
2
Comparator A Inverting Input
Comparator A Noninverting Input
Comparator B Noninverting Input
Comparator B Inverting Input
Comparator B Output
3
3
INA+
INB+
INB-
5
5
6
6
7
7
OUTB
OUTC
INC-
—
—
—
—
—
—
8
Comparator C Output
9
Comparator C Inverting Input
Comparator C Noninverting Input
Comparator D Noninverting Input
Comparator D Inverting Input
Comparator D Output
10
12
13
14
INC+
IND+
IND-
OUTD
tor’s output sets the trip voltage. Therefore, the trip volt-
Detailed Description
age is related to the output voltage.
The MAX9021/MAX9022/MAX9024 are single/dual/
quad, low-cost, low-power comparators that consume
These comparators have 4mV internal hysteresis.
Additional hysteresis can be generated with two resis-
tors, using positive feedback (Figure 1). Use the follow-
ing procedure to calculate resistor values:
only 2.8µA and provide a propagation delay, t , typi-
PD
cally 3µs. They have an operating-supply voltage from
2.5V to 5.5V when operating from a single supply and
from 1.25V to 2.75V when operating from dual power
supplies. Their common-mode input voltage range
extends from the negative supply to within 1.1V of the
positive supply. Internal hysteresis ensures clean out-
put switching, even with slow-moving input signals.
1) Find the trip points of the comparator using these for-
mulas:
V
TH
= V
+ ((V
REF
- V
)R2) / (R1 + R2)
REF
REF
= V
DD
V
(1 - (R2 / (R1 + R2))
TL
where V is the threshold voltage at which the com-
TH
Applications Information
parator switches its output from high to low as V
IN
rises above the trip point. V is the threshold volt-
Adding Hysteresis
Hysteresis extends the comparator’s noise margin by
increasing the upper threshold and decreasing the
lower threshold. A voltage-divider from the compara-
TL
age at which the comparator switches its output from
low to high as V drops below the trip point.
IN
_______________________________________________________________________________________
5
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
V
DD
R1
V
DD
V
DD
V
DD
R2
IN+
IN-
V
IN
IN+
IN-
V
REF
OUT
OUT
10kΩ
V
IN
MAX9021
0.1µF
MAX9021
V
SS
V
SS
Figure 1. Additional Hysteresis
Figure 2. Time Averaging of the Input Signal for Data Recovery
2) The hysteresis band will be:
Board Layout and Bypassing
Use 100nF bypass as a starting point. Minimize signal
trace lengths to reduce stray capacitance. Minimize the
capacitive coupling between IN- and OUT. For slow-
moving input signals (rise time > 1ms), use a 1nF
capacitor between IN+ and IN-.
V
= V - V = V (R2 / (R1 + R2))
TH TL DD
HYS
3) In this example, let V
= 5V and V
= 2.5V.
REF
DD
V
= 2.5V + 2.5V(R2 / (R1 + R2))
TH
and
Biasing for Data Recovery
Digital data is often embedded into a bandwidth and
amplitude-limited analog path. Recovering the data can
be difficult. Figure 2 compares the input signal to a
time-averaged version of itself. This self-biases the
threshold to the average input voltage for optimal noise
margin. Even severe phase distortion is eliminated from
the digital output signal. Be sure to choose R1 and C1
so that:
V
= 2.5V[(1 - (R2 / (R1 + R2))]
TL
4) Select R2. In this example, we will choose 1kΩ.
5) Select V . In this example, we will choose 50mV.
HYS
6) Solve for R1.
V
= V (R2 / (R1 + R2))
DD
HYS
0.050V = 5(1000Ω/(R1 + 1000Ω)) V
where R1 ≈ 100kΩ, V = 2.525V, and V = 2.475V.
TH
TL
ƒ
CAR
>> 1 / (2πR1C1)
The above-described design procedure assumes rail-
to-rail output swing. If the output is significantly loaded,
the results should be corrected.
where ƒ
is the fundamental carrier frequency of the
CAR
digital data stream.
6
_______________________________________________________________________________________
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Typical Application Circuit
Chip Information
MAX9021 TRANSISTOR COUNT: 106
V
DD
MAX9022 TRANSISTOR COUNT: 212
MAX9024 TRANSISTOR COUNT: 424
V
IN
0.1µF
R1
V
DD
IN+
IN-
V
REF
OUT
RL
MAX9021
R2
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
_______________________________________________________________________________________
7
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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