MAX9144 [MAXIM]
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators; 为40ns ，低功耗， 3V / 5V ，轨到轨单电源比较器
| 型号： | MAX9144 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators |
| 文件： | 总12页 (文件大小：326K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2064; Rev 0; 6/01
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
General Description
Features
ꢀ Fast, 40ns Propagation Delay (10mV Overdrive)
The MAX9140/MAX9141 are single and the MAX9142/
MAX9144 are dual/quad high-speed comparators opti-
mized for systems powered from a 3V or 5V supply. The
MAX9141 features latch enable and device shutdown.
These devices combine high speed, low power, and
Rail-to-Rail® inputs. Propagation delay is 40ns, while
supply current is only 150µA per comparator.
ꢀ Low Power:
0.45mW Power Dissipation Per Comparator (3V)
150µA Supply Current
ꢀ Optimized for 3V and 5V Applications
(Operation Down to 2.7V)
The input common-mode range of the MAX9140/
MAX9141/MAX9142/MAX9144 extends beyond both
power-supply rails. The outputs pull to within 0.3V of
either supply rail without external pullup circuitry, mak-
ing these devices ideal for interface with both CMOS
and TTL logic. All input and output pins can tolerate a
continuous short-circuit fault condition to either rail.
Internal hysteresis ensures clean output switching, even
with slow-moving input signals.
ꢀ Rail-to-Rail Input Voltage Range
ꢀ Low, 500µV Offset Voltage
ꢀ Internal Hysteresis for Clean Switching
ꢀ Outputs Swing 300mV of Power Rails
ꢀ CMOS/TTL-Compatible Outputs
ꢀ Output Latch (MAX9141 only)
ꢀ Shutdown Function (MAX9141 only)
ꢀ Available in SC70 and SOT23 Packages
The MAX9140/MAX9141/MAX9142/MAX9144 are high-
er-speed, lower-power, and lower-cost upgrades to
industry-standard comparators MAX941/MAX942/
MAX944.
Ordering Information
The MAX9140 are offered in tiny 5-pin SC70 and SOT23
packages. The MAX9141 and MAX9142 are available in
8-pin SOT23 and SO packages, while the MAX9144 is
available in both 14-pin SO and TSSOP packages.
TEMP.
RANGE
PIN-
PACKAGE
TOP
MARK
PART
MAX9140EXK-T -40°C to +85°C
MAX9140EUK-T -40°C to +85°C
MAX9141EKA-T -40°C to +85°C
5 SC70-5
5 SOT23-5
8 SOT23-8
8 SO
ACC
ADQP
AAFD
—
Applications
Line Receivers
MAX9141ESA
-40°C to +85°C
Battery-Powered Systems
Threshold Detectors/Discriminators
3V/5V Systems
MAX9142EKA-T -40°C to +85°C
8 SOT23-8
8 SO
AAFE
—
MAX9142ESA
MAX9144EUD
MAX9144ESD
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
14 TSSOP
14 SO
—
—
Zero-Crossing Detectors
Sampling Circuits
Pin Configurations
TOP VIEW
OUTA
INA-
OUTD
IND-
1
2
3
4
5
6
7
14
13
12
11
10
9
MAX9140
OUT
GND
IN+
1
2
3
5
4
V
CC
MAX9141
V
1
2
3
4
1
2
3
4
MAX9142
8
7
6
5
N.C.
OUT
8
7
6
5
V
CC
OUTA
INA-
A
B
D
C
CC
+
+
INA
IND
+
IN
OUTB
INB-
A
GND
V
CC
MAX9144
IN-
SHDN
LE
+
INA
+
+
INB
INB-
OUTB
B
INC
GND
+
INB
GND
IN-
INC-
SOT23/SO
SOT23/SO
OUTC
8
SC70/SOT23
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.
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
ABSOLUTE MAXIMUM RATINGS
Power Supply Ranges
Continuous Power Dissipation (T = +70°C)
A
Supply Voltage (V
to GND)...........................................+6V
5-Pin SC70 (derate 3.1mW/°C above +70°C).............247mW
CC
Differential Input Voltage.......................-0.3V to (V
Common-Mode Input Voltage to GND ..-0.3V to (V
LE Input Voltage (MAX9141 only) .........-0.3V to (V
SHDN Input Voltage (MAX9141 only)....-0.3V to (V
Input/Output Short-Circuit Duration to
+ 0.3V)
+ 0.3V)
+ 0.3V)
+ 0.3V)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C)...........727mW
8-Pin SO (derate 5.9mW/°C above +70°C)..............470.6mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ........727mW
14-Pin SO (derate 8.33mW/°C above +70°C)..........666.7mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
CC
CC
CC
V
CC
or GND .....................................................Continuous
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, SHDN = LE = V
(MAX9141 only), C = 15pF, T = T
to T
, unless otherwise noted. Typical values are
MAX
CC
CC
MIN
CM
L
A
at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage
V
(Note 2)
(Note 3)
2.7
5.5
V
CC
V
+
CC
0.2
Input Voltage Range
Input Offset Voltage
V
-0.2
V
CMR
T
T
= +25°C
0.5
2
A
V
(Note 4)
mV
OS
= T
to T
4.5
A
MIN
MAX
Input Hysteresis
V
(Note 5)
(Note 6)
1.5
90
8
mV
nA
HYST
Input Bias Current
I
320
120
800
750
B
Input Offset Current
I
nA
OS
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
V
= 5.5V (Note 7)
80
80
µV/V
µV/V
CC
2.7V
V
5.5V
CC
V
-
V
0.3
-
CC
CC
Output High Voltage
V
I
I
= 4mA
V
OH
SOURCE
0.425
Output Low Voltage
V
= 4mA
SINK
0.3
0.04
165
0.425
1
V
OL
Output Leakage Current
I
SHDN = GND, MAX9141 only (Note 8)
µA
LEAK
MAX9141
275
V
V
= V
= V
= 3V
= 5V
MAX9140/MAX9142/
MAX9144
MAX9141
MAX9140/MAX9142/
MAX9144
CM
CM
CC
CC
150
200
165
250
320
300
Supply Current (Per Comparator)
Propagation Delay
I
µA
ns
CC
MAX9141 only, SHDN = GND;
V
12
40
30
= V
= 3V
CM
CC
t
,
PD+
t
V
= 3V, V
= 10mV
CC
OD
PD-
Differential Propagation Delay
Propagation Delay Skew
dt
V
V
= 10mV (Note 9)
= 10mV (Note 10)
2
2
ns
ns
PD
OD
OD
V
/2 +
0.4
CC
Logic Input Voltage High
V
(Note 11)
(Note 11)
V
/2
V
IH
CC
V
/2 -
0.4
CC
Logic Input Voltage Low
Logic Input Current
V
V
/2
CC
V
IL
I , I
IL IH
V
= 0 to V (Note 11)
CC
2
10
µA
LOGIC
2
_______________________________________________________________________________________
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
ELECTRICAL CHARACTERISTICS (continued)
(V
= 5V, V
= 0, SHDN = LE = V
(MAX9141 only), C = 15pF, T = T
to T
, unless otherwise noted. Typical values are
MAX
CC
CC
MIN
CM
L
A
at T = +25°C.) (Note 1)
A
PARAMETER
Data-to-Latch Setup Time
Latch-to-Data Hold Time
Latch Pulse Width
SYMBOL
CONDITIONS
MIN
TYP
16
16
45
60
1
MAX
UNITS
ns
t
(Note 12)
(Note 12)
(Note 12)
(Note 12)
(Note 13)
(Note 13)
S
t
ns
H
t
ns
LPW
Latch Propagation Delay
Shutdown Enable Time
Shutdown Disable Time
t
ns
LPD
µs
5
µs
Note 1: All devices are 100% production tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 2: Inferred from PSRR test.
Note 3: Inferred from CMRR test. Note also that either or both inputs can be driven to the absolute maximum limit (0.3V beyond either
supply rail) without damage or false output inversion.
Note 4:
V
OS
is defined as the center of the input-referred hysteresis zone. See Figure 1.
Note 5: The input-referred trip points are the extremities of the differential input voltage required to make the comparator output
change state. The difference between the upper and lower trip points is equal to the width of the input-referred hysteresis
zone. See Figure 1.
Note 6: The polarity of I reverses direction as V
approaches either supply rail.
B
CM
Note 7: Specified over the full common-mode voltage range (V
).
CMR
Note 8: Specification is for current flowing into or out of the output pin for V
is in shutdown.
driven to any voltage from V to GND while the part
CC
OUT
Note 9: Specified between any two channels in the MAX9142/MAX9144.
Note 10: Specified as the difference between t
and t
for any one comparator.
PD+
PD-
Note 11: Applies to the MAX9141 only for both SHDN and LE.
Note 12: Applies to the MAX9141 only. Comparator is active with LE driven high and is latched with LE driven low (V
= 10mV). See
OD
Figure 2.
Note 13: Applicable to the MAX9141 only. Comparator is active with the SHDN driven high and is shutdown with SHDN driven low.
Shutdown enable time is the delay when the SHDN is driven high to the time the output is valid. Shutdown disable time is the
delay when the SHDN is driven low to the time the comparator shuts down.
_______________________________________________________________________________________
3
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
Typical Operating Characteristics
(V
= 3.0V, V
= 0, C =15pF, V
= 10mV, T = +25°C, unless otherwise noted.)
CC
CM
L
OD A
MAX9140 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
OUTPUT LOW VOLTAGE
vs. TEMPERATURE
300
250
200
150
100
50
330
328
326
324
322
320
I
= 4mA
SINK
T = +85 C
A
T = +25 C
A
T = -40 C
A
0
3
4
5
6
-40 -20
0
20
40
60
80 100
V
CC
(V)
TEMPERATURE ( C)
OUTPUT SHORT-CIRCUIT (SINK) CURRENT
vs. TEMPERATURE
OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
50
45
40
35
5.20
5.15
I
V
= 4mA
SOURCE
= 5.5V
CC
5.10
5.05
5.00
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
TEMPERATURE ( C)
TEMPERATURE ( C)
OUTPUT SHORT-CIRCUIT (SOURCE)
CURRENT vs. TEMPERATURE
INPUT BIAS CURRENT
vs. TEMPERATURE
45
35
25
15
140
120
100
80
60
40
20
0
-40 -20
0
20
40
60
80 100
-50
-25
0
25
50
75
100
TEMPERATURE ( C)
TEMPERATURE ( C)
4
_______________________________________________________________________________________
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
Typical Operating Characteristics (continued)
(V
= 3.0V, V
= 0, C =15pF, V
= 10mV, T = +25°C, unless otherwise noted.)
CC
CM
L
OD A
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
TRIP POINT
vs. TEMPERATURE
500
400
300
200
100
0
1.0
0.8
V
TRIP+
0.6
0.4
0.2
0
-100
-200
-300
-400
-500
-0.2
-0.4
-0.6
-0.8
-1.0
V
TRIP-
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
TEMPERATURE ( C)
TEMPERATURE ( C)
INPUT VOLTAGE RANGE
vs. TEMPERATURE
PROPAGATION DELAY
vs. INPUT OVERDRIVE
7
6
45
40
35
30
25
20
V
CC
= 5.5V
V
+
CMR
5
t
PD+
4
3
t
PD-
2
1
0
V
-
CMR
-1
-40 -20
0
20
40
60
80 100
0
20
40
60
80
100
TEMPERATURE ( C)
INPUT OVERDRIVE (mV)
PROPAGATION DELAY
vs. TEMPERATURE
PROPAGATION DELAY
vs. CAPACITIVE LOAD
50
45
40
35
30
25
55
50
45
40
35
30
25
20
t
PD+
t
PD+
t
PD-
t
PD-
-50
-25
0
25
50
75
100
15
30
45
60
75
90
105
TEMPERATURE ( C)
CAPACITIVE LOAD (pF)
_________________________________________________________________________________________________
5
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
Typical Operating Characteristics (continued)
(V
= 3.0V, V
= 0, C =15pF, V
= 10mV, T = +25°C, unless otherwise noted.)
CC
CM
L
OD
A
SINUSOID RESPONSE AT 4MHz
PROPAGATION DELAY (t -)
PROPAGATION DELAY (t +)
PD
PD
V
OD
= 10mV
V
CC
= 5.5V
V
CC
= 5.5V
V
OD
= 10mV
V
CC
= 5.5V
INPUT
50mV/div
INPUT
50mV/div
INPUT
50mV/div
OUTPUT
2V/div
OUTPUT
2V/div
OUTPUT
2V/div
50ns/div
10ns/div
10ns/div
Pin Description
PIN
NAME
FUNCTION
MAX9140 MAX9141 MAX9142 MAX9144
—
—
—
—
1
2
1
2
OUTA
INA-
Comparator A Output
Comparator A Inverting Input
Comparator A Noninverting Input
Positive Supply
3
3
INA+
—
5
—
1
8
4
V
CC
—
—
—
—
—
—
2
—
—
—
—
—
—
4
5
5
INB+
INB-
Comparator B Noninverting Input
Comparator B Inverting Input
Comparator B Output
6
6
7
7
OUTB
OUTC
INC-
INC+
GND
IND+
IND-
OUTD
IN+
—
—
—
4
8
Comparator C Output
9
Comparator C Inverting Input
Comparator C Noninverting Input
Ground
10
11
12
13
14
—
—
—
—
—
3
—
—
—
2
—
—
—
—
—
Comparator D Noninverting Input
Comparator D Inverting Input
Comparator D Output
Noninverting Input
4
3
IN-
Inverting Input
———–
———–
Shutdown: MAX9141 is active when SHDN is driven high;
———–
—
—
6
5
—
—
—
—
SHDN
MAX9141 is in shutdown when SHDN is driven low.
The output is latched when LE is low. The latch is transparent when
LE is high.
LE
1
7
8
—
—
—
—
OUT
N.C.
Comparator Output
—
No Connection. Not internally connected.
6
_______________________________________________________________________________________
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
Detailed Description
The MAX9140/MAX9141/MAX9142/MAX9144 single-
supply comparators feature internal hysteresis, high
speed, and low power. Their outputs are pulled to with-
in 300mV of either supply rail without external pullup or
pulldown circuitry. Rail-to-rail input voltage range and
low-voltage single-supply operation make these
devices ideal for portable equipment. The
MAX9140/MAX9141/MAX9142/MAX9144 interface
directly to CMOS and TTL logic.
V
TRIP+
V
IN+
V
V
HYST
V
+ V
2
TRIP+
TRIP-
=
OS
IN-
V
= 0
V
TRIP-
Most high-speed comparators oscillate in the linear
region because of noise or undesired parasitic feed-
back. This tends to occur when the voltage on one
input is at or equal to the voltage on the other input. To
counter the parasitic effects and noise, the MAX9140/
MAX9141/MAX9142/MAX9144 have an internal hystere-
sis of 1.5mV.
V
V
OH
COMPARATOR
OUTPUT
OL
The hysteresis in a comparator creates two trip points:
one for the rising input voltage and one for the falling
input voltage (Figure 1). The difference between the trip
points is the hysteresis. The average of the trip points is
the offset voltage. When the comparator’s input volt-
ages are equal, the hysteresis effectively causes one
comparator input voltage to move quickly past the
other, thus taking the input out of the region where
oscillation occurs. Standard comparators require hys-
teresis to be added with external resistors. The
MAX9140/MAX9141/MAX9142/MAX9144’s fixed internal
hysteresis eliminates these resistors. To increase hys-
teresis and noise margin even more, add positive feed-
back with two resistors as a voltage divider from the
output to the noninverting input.
Figure 1. Input and Output Waveform, Noninverting Input
Varied
Input Stage Circuitry
The MAX9140/MAX9141/MAX9142/MAX9144 include
internal protection circuitry that prevents damage to the
precision input stage from large differential input volt-
ages. This protection circuitry consists of two back-to-
back diodes between IN+ and IN- as well as two series
4.1k resistors (Figure 3). The diodes limit the differen-
tial voltage applied to the internal circuitry of the com-
Figure 1 illustrates the case where IN- is fixed and IN+
is varied. If the inputs were reversed, the figure would
look the same, except the output would be inverted.
parators to be no more than 2V , where V is the for-
F
F
ward voltage drop of the diode (about 0.7V at +25°C).
For a large differential input voltage (exceeding 2V ),
F
this protection circuitry increases the input bias current
at IN+ (source) and IN- (sink).
The MAX9141 includes an internal latch that allows
—
storage of comparison results. The LE pin has a high
—
input impedance. If LE is high, the latch is transparent
(IN+ - IN-) - 2V
F
(i.e., the comparator operates as though the latch is not
Input Current =
2 x 4.1k
present). The comparator's output state is latched
—
when LEis pulled low (Figure 2).
Input current with large differential input voltages
should not be confused with input bias current (I ). As
B
Shutdown Mode (MAX9141 Only)
–———–
long as the differential input voltage is less than 2V ,
F
The MAX9141 shuts down when the SHDN pin is low.
this input current is equal to I . The output is in the cor-
B
When shut down, the supply current drops to less than
rect logic state if one or both inputs are within the com-
mon-mode range.
12µA, and the three-state output becomes high imped-
–———–
ance. The SHDN pin has a high-input impedance.
———–
—
Connect SHDN to V
for normal operation. Exit shut-
CC
down with LE high (transparent state); otherwise, the
output will be indeterminate.
_______________________________________________________________________________________
7
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
t
S
t
H
V
OD
V
OS
DIFFERENTIAL
INPUT
VOLTAGE
t
LPW
V
CC
V
CC
2
LE
0
t
t
LPD
PD
V
OH
V
CC
2
OUT
V
OL
Figure 2. MAX9141 Timing Diagram with Latch Operator
Output Stage Circuitry
The MAX9140/MAX9141/MAX9142/MAX9144 contain a
current-driven output stage as shown in Figure 4.
MAX9140
MAX9141
MAX9142
MAX9144
During an output transition, I
or I
is pushed
SOURCE
SINK
or pulled to the output pin. The output source or sink
current is high during the transition, creating a rapid
4.1k
IN+
TO INTERNAL
CIRCUITRY
slew rate. Once the output voltage reaches V
or
OH
V
, the source or sink current decreases to a small
OL
value, capable of maintaining the V
condition. This significant decrease in current con-
or V
static
OL
OH
serves power after an output transition has occurred.
TO INTERNAL
CIRCUITRY
One consequence of a current-driven output stage is a
linear dependence between the slew rate and the load
capacitance. A heavy capacitive load will slow down a
voltage output transition. This can be useful in noise-
sensitive applications where fast edges may cause
interference.
IN–
4.1k
Applications Information
Circuit Layout and Bypassing
The high-gain bandwidth of the MAX9140/MAX9141/
MAX9142/MAX9144 requires design precautions to
realize the full high-speed capabilities of these com-
parators. The recommended precautions are:
Figure 3. Input Stage Circuitry
3) Pay close attention to the decoupling capacitor’s
bandwidth, keeping leads short.
4) On the inputs and outputs, keep lead lengths
short to avoid unwanted parasitic feedback
around the comparators.
1) Use a printed circuit board with a good, unbro-
ken, low-inductance ground plane.
2) Place a decoupling capacitor (a 0.1µF ceramic
5) Solder the device directly to the printed circuit
board instead of using a socket.
capacitor is a good choice) as close to V
possible.
as
CC
8
_______________________________________________________________________________________
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
V
= 3.3V
DD
VREFC
V
DD
V
CC
MAX9140
MAX9141
MAX9142
MAX9144
SERIAL
DIGITAL
INPUT
SDI
I
SOURCE
8-BIT DAC
MAX512
OUTPUT
DACOUTC
V
GND
SS
MAX9140
I
SINK
GND
ANALOG IN
Figure 4. Output Stage Circuitry
Figure 5. 3.3V Digitally Controlled Threshold Detector
Chip Information
MAX9140 TRANSISTOR COUNT: 158
MAX9141 TRANSISTOR COUNT: 192
MAX9142 TRANSISTOR COUNT: 314
MAX9144 TRANSISTOR COUNT: 620
PROCESS: Bipolar
V
= 3V
CC
10k
3V
0
COAX LINE
20k
MAX9140
CLEAN
DIGITAL
SIGNAL
20k
Figure 6. Line Receiver Application
_______________________________________________________________________________________
9
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
________________________________________________________Package Information
10 ______________________________________________________________________________________
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
___________________________________________Package Information (continued)
______________________________________________________________________________________ 11
40ns, Low-Power, 3V/5V, Rail-to-Rail
Single-Supply Comparators
___________________________________________Package Information (continued)
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.
12 __________________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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