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MAX901B 中文资料
元器件交易网 www.cecb2b.com
19-2887; Rev. 4; 7/01
High-Speed, Low-Power Voltage Comparators
The MAX900–MAX903 high-speed, low-power, single/o8ns (typ) Propagation Delay
dual/quad voltage comparators feature differential ana-log inputs and TTL-logic
outputs with active internal pull-o18mW/Comparator Power Consumption ( 5V, typ)ups.
Fast propagation delay (8ns typ at 5mV overdrive)makes the MAX900–MAX903 ideal for
fast A/D convert-oSeparate Analog and Digital Suppliesers and sampling circuits, line
receivers, V/F converters,oFlexible Analog Supply:
5V to
10V or ±5Vand many other
data-discrimination applications.
oInput Range Includes Negative Supply RailAll comparators can be powered from
separate
analogand
digital
power
supplies
or
from
a
single
combined
sup-oTTL-Compatible Outputs
ply voltage. The analog input common-mode rangeoTTL-Compatible Latch Inputs (Except
MAX901)
includes
the
negative
rail,
allowing
ground
whenpohttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlwered
sensing
from
a
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single supply. The MAX900–MAX903consume 18mW per comparator when powered from
5V.The MAX900–MAX903 are equipped with independentTTL-compatible latch inputs. The
comparator outputstates are held when the latch inputs are driven low. TheMAX901
provides the same performance as theMAX900/MAX902/MAX903 with the exception of
thelatches.
For newer, pin-for-pin compatible parts with the samespeed and only half the power
dissipation, see theMAX9201/MAX9202/MAX9203 data sheet.
Applications
High-Speed A/DInput Trigger CircuitryConverters
High-Speed DataHigh-Speed V/FSamplingConvertersPWM Circuits
Line Receivers
Threshold Detectors
Ordering Information continued at end of data sheet.
Pin Configurations
________________________________________________________________Maxim Integrated
Products
1
For
pricing,
delivery,
orderinghttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.html
and
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information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s
website at www.maxim-ic.com.
MAX900–MAX903
High-Speed, Low-Power Voltage ComparatorsMAX900–MAX903
ABSOLUTE MAXIMUM RATINGS
Analog Supply Voltage (VCCto VEE)................................... 12VDigital
Supply Voltage (VDDto GND).................................... 7VDifferential
Input Voltage..................(VEE - 0.2V) to (VCC
Voltage..........(VEE- 0.2V) to (VCC
0.2V)Common-Mode Input
0.2V)Latch-Input Voltage (MAX900/MAX902/
MAX903 only) .........................................-0.2V to (VDD
0.2V)Output
Short-Circuit Duration
To
GND.......................................................................Indefi
niteTo
VDD.............................................................................
..1min
Internal
Power
Dissipation................................................50http://www.wenkuxia
zai.com/doc/ac5226e1b8f67c1cfad6b8c7.html0mWDerate
above
100°C................................................10mW/°COperating
Temperature Ranges:
MAX900–MAX903_C_
_.......................................0°C
to
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70°CMAX900–MAX903_E_
85°CJunction
_....................................-40°C
Temperature........................................-65°C
160°CStorage Temperature Range.............................-65°C to
to
to
150°CLead
Temperature (soldering, 10s)................................. 300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only, and functionaloperation of the
device at these or any other conditions beyond those indicated in the operational
sections of the specifications is not implied. Exposure toabsolute maximum rating
conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC=
5V,
VEE=
VDhttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlD=
logic high, TA=
-5V,
5V, LE1–LE4 =
25°C, unless otherwise noted.)
2_______________________________________________________________________________
________
High-Speed, Low-Power Voltage Comparators
________________________________________________________________________________
_______3
MAX900–MAX903
High-Speed, Low-Power Voltage ComparatorsMAX900–MAX903
4_______________________________________________________________________________
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________
High-Speed, Low-Power Voltage Comparators
ELECTRICAL CHARACTERISTICS (continued)
TIMING CHARACTERISTICS
(VCC=
5V, VEE= -5V, VDD=
5V, LE1–LE4 = logic high, TA= full operating temperature,
unless otherwise noted.)
VEE. The upper-end of the common-mode voltage range is typically VCC- 2V, but either
or both inputs can go to a maximumof VCC
Note
0.2V without damage.
2:Tested
for
4.75V ://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlpar
range is
4.75V
Note 3:Specification does not apply to MAX901.
Note 4:Guaranteed by design. Times are for 100mV step inputs (see Propagation Delay
Characteristics in Figures 2 and 3).Note 5:Maximum difference in propagation delay
between any of the four comparators in the MAX900–MAX903.
Note 6:See Timing Diagram (Figure 2). Owing to the difficult and critical nature of
switching measurements involving the latch,
these parameters cannot be tested in a production environment. Typical specifications
listed are taken from measurementsusing a high-speed test-jig.
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Note 7:ICCtested for
for
4.75V
4.75V
________________________________________________________________________________
_______5
MAX900–MAX903
High-Speed, Low-Power Voltage ComparatorsMAX900–MAX903
(TA =
25°C, unless otherwise noted.)
INPUT
OFFSET
VOLTAGEvs.
TEMPEhttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlRATURE
MAX900-03 toc01
INPUT BIAS CURRENTvs. TEMPERATURE
MAX900-03 toc0OUTPUT LOW VOLTAGE(VOL) vs. LOAD CURRENT
INPUT OFFSET VOLTAGE (mV)
210-1-2
4.0INPUT BIAS VOLTAGE (?V)
3.53.02.52.0
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0.5OUTPUT LOW VOLTAGE (V)
0.40.30.20.1
2
4
6
8
10
-40-20020406080100120-40-20020406080100120
TEMPERATURE (°C)TEMPERATURE (°C)
LOAD CURRENT (mA)
ICC SUPPLY CURRENT (PER COMPARATOR)
vs. VCC SUPPLY VOLTAGE
IINPUT OVERDRIVE vs.tpd
INPUT VOLTAGE
RESPONSE TIME
OUTPUT VOLTAGE
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2
4
6
8
10
12
14
INPUT OVERDRIVE vs.tpd- RESPONSE TIME
2
4
6
8
10
12
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14
INPUT VOLTAGE O
UTPUT VOLTAGE://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlr
3.0ICC SUPPLY CURRENT (mA)
2.82.62.42.22.01.81.6
4
5678910
VCC SUPPLY VOLTAGE (V)tpd
RESPONSE TIME (ns)tpd- RESPONSE TIME (ns)
RESPONSE TIME vs.
TEMPERATURE (5mV OVERDRIVE)
RESPONSE TIME vs. LOAD CAPACITANCE
(5mV OVERDRIVE)
141312
1312RESPONSE TIME (ns)
111098
765
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-40-20
20406080100120
1110987
TEMPERATURE (°C)614
High-Speed, Low-Power Voltage Comparators
MAX900
MAX902
MAX903
________________________________________________________________________________
_______7
MAX900–MAX903
High-Speed, Low-Power Voltage ComparatorsMAX900–MAX903
Circuit Layout
Because of the large gain-bandwidth transfer function ofthe MAX900–MAX903, special
precautions
must
betaken
to
realize
their
full
high-speed
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capahttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlbility.
A
printedcircuit board with a good, low-inductance ground planeis mandatory. All
decoupling capacitors (the small100nF ceramic type is a good choice) should be
mount-ed as close as possible to the power-supply pins.Separate decoupling capacitors
for analog VCCand fordigital VDDare also recommended. Close attentionshould be paid
to the bandwidth of the decoupling andterminating components. Short lead lengths on
theinputs and outputs are essential to avoid unwanted par-asitic feedback around the
comparators. Solder thedevice directly to the printed circuit board instead ofusing
a socket.
pushes the output through the transition region cleanly,but applies a hysteresis in
threshold seen at the inputterminals.
TTL Output and Latch Inputs
The comparator TTL-output stages are optimized for dri-ving low-power Schottky TTL
with a fan-out of four.
When
the
latch
is
connected
to
a
logic
high
lehttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlvel or leftfloating,
the comparator is transparent and immediatelyresponds to changes at the input
terminals. When thelatch is connected to a TTL low level, the comparatoroutput latches
in the same state as at the instant that thelatch command is applied, and will not
respond to sub-sequent changes at the input. No latch is provided onthe MAX901.
Power Supplies
The MAX900–MAX903 can be powered from separateanalog and digital supplies or from
a single
5V supply.The analog supply can range from
5V to
10V withVEEgrounded for
single-supply operation (Figures 1Aand 1B) or from a split ±5V supply (Figure 1C).
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The VDDdigital supply always requires
5V.
In high-speed, mixed-signal applications where a com-mon ground is shared, a noisy
digital environment canadversely affect the analog input signal. When set upwith
separate supplies (Figure 1C), theMAX900–MAX903 isolate analog and digital signals
byprovidihttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlng
a
separate AGND (VEE) and DGND.
Input Slew-Rate Requirements
As with all high-speed comparators, the high gain-band-width product of the
MAX900–MAX903 can create oscil-lation problems when the input traverses the
linearregion. For clean output switching without oscillation orsteps in the output
waveform, the input must meet mini-mum slew-rate requirements. Oscillation is largely
afunction of board layout and of coupled source imped-ance and stray input capacitance.
Both poor layout andlarge-source impedance will cause the part to oscillateand
increase the minimum slew-rate requirement. Insome applications, it may be helpful
to apply some posi-tive feedback between the output and
input. This
Figure 1A. Separate Analog Supply,Common GroundFigure 1B. Single
5V Supply,
CommonGroundFigure 1C. Split ±5V Supply, Separate Ground
8________________________________________________________________http://www.wenk
uxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.html_______________________
High-Speed, Low-Power Voltage Comparators
VOS
Input Offset Voltage:between the two input terminals to obtain Voltage appliedtpd
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(D)
Latch Disable-to-Output High Delay:The propagation delay measured fromTTL-logic
threshold ( 1.4V) at thethe latch-signal crossing the TTL
output.
threshold in a low-to-high transition tothe point of the output crossing TTLthreshold
in a low-to-high transition.VIN
Input Voltage Pulse Amplitude: set to 100mV for comparatorUsuallytpd- (D)
Latch
Disable-to-Output
Low
Delay:The
propagation
delay
measured
fromspecifications.
the latch-signal crossing the TTL
threshold in a low-to-high transition tothe point of the output crossing TTLthreshold
in a high-to-low transition.VOD
Input Voltage Overdrive: 5mV and in opposite polarity to VUsually set tots
Minimum
Setup
Time:
fohttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlrtime
IN
before
the
negative transition of theThe minimumcomparator specifications.
latch signal that an input signal changemust be present in order to be acquiredand
held at the outputs.
tpd
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Input-to-Output High Delay:propagation delay measured from the Theth
Minimum Hold Time:time the input signal crosses the inputafter the negative
transition of the latch The minimum timeoffset voltage to the TTL-logic
thresholdsignal that an input signal must remainunchanged in order to be acquired
andof an output low-to-high transitionheld at the output.
tpd-Input-to-Output Low Delay:propagation delay measured from the The
tpw (D)
Minimum Latch-Disable Pulse Width:The minimum time that the latch signaltime the
input signal crosses the inputmust remain high in order to acquire andoffset voltage
to the TTL-logic thresholdhold an input-signal change.
of
an
output
high-to-lhttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlow
transition.
________________________________________________________________________________
_______9
MAX900–MAX903
High-Speed, Low-Power Voltage ComparatorsMAX900–MAX903
Figure 3. tpd Response Time to 5mV Overdrive
Figure 2. MAX900/MAX902/MAX903 Timing Diagram
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Figure 4. tpd-Response Time to 5mV Overdrive
Figure 5. Response-Time Setup
10______________________________________________________________________________
________
High-Speed, Low-Power Voltage Comparators
Figure 6. Response to 50MHz Sine Wave
Figure 7. Response to 100MHz Sine Wave Photo
Programmed, Variable-Alarm Limits
By combining two quad analog comparators with anoctal 8-bit D/A converter (the MX7228),
several alarmand limit-defect functions can be performed simultane-ously without
external adjustments
The
MX7228’s
internal
latches
allow
thttp://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlhe
systemprocessor
to set the limit points for each comparatorindependently and update them at any time.
Set theupper and lower thresholds for a single transducer bypairing the D/A converter
and comparator sections.
Figure 8. Alarm Circuit Level Monitors Eight Separate Inputs
________________________________________________________________________________
______
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11
MAX900–MAX903
High-Speed, Low-Power Voltage ComparatorsMAX900–MAX903
Ordering Information (continued)
Maxim cannot assume responsibility for use of any circuitry other than circuitry
entirely embodied in a Maxim product. No circuit patent licenses areimplied. 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
http://www.wenkuxiazai.com/doc/ac5226e1b8f67c1cfad6b8c7.htmlPrinted USA
is a registered trademark of Maxim Integrated Products.
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