MAX9021AXK-T ,Micropower / Ultra-Small / Single/Dual/Quad / Single-Supply Comparatorsapplications from 2.5V to5.5V, but can also operate from dual supplies. These 3µs Propagation Dela ..
MAX9022AKA+T ,Micropower, Ultra-Small, Single/Dual/Quad Single-Supply ComparatorsFeaturesThe MAX9021/MAX9022/MAX9024 single/dual/quad♦ Low-Cost Solution Available in Space-Saving c ..
MAX9024ASD ,Micropower / Ultra-Small / Single/Dual/Quad / Single-Supply ComparatorsApplicationsMAX9022AUA -40°C to +125°C 8 µMAXBattery-Powered Digital Line ReceiversMAX9022ASA -40°C ..
MAX9024AUD ,Micropower / Ultra-Small / Single/Dual/Quad / Single-Supply Comparatorsapplications. No Phase Reversal for Overdriven InputsThe MAX9021/MAX9022/MAX9024 have 4mV of buil ..
MAX9025EBT+T ,UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without ReferenceElectrical Characteristics-MAX9025/MAX9026 (with REF) (continued)(V = +5V, V = 0V, V = V , T = -40° ..
MAX9026EBT ,UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Referenceapplications.(MAX9025/MAX9027) The unique design of the output stage limits supply- ● Open-Drain Ou ..
MB88101A ,A/D Converter (With 4-channel Input at 12-bit Resolution)FEATURES• 4-channel analog input• One analog input channel selectable for conversion by external co ..
MB88101A ,A/D Converter (With 4-channel Input at 12-bit Resolution)FUJITSU SEMICONDUCTORDS04-13105-2EDATA SHEETLinear IC ConverterCMOSA/D Converter(With 4-channel I ..
MB88101APF ,A/D Converter (With 4-channel Input at 12-bit Resolution)FEATURES• 4-channel analog input• One analog input channel selectable for conversion by external co ..
MB88141 ,D/A Converter for Digital Tuning (With Built-in OP Amp and I/O Expander)FUJITSU SEMICONDUCTORDS04-13211-3EDATA SHEETGeneral Purpose Linear IC’s General Purpose ConvertersC ..
MB88141A ,D/A Converter for Digital Tuning (Compatible with I 2 C Bus)FUJITSU SEMICONDUCTORDS04-13213-1EDATA SHEETLinear IC ConverterCMOSD/A Converter for Digital Tuning ..
MB88141APF ,D/A Converter for Digital Tuning (Compatible with I2C Bus)FUJITSU SEMICONDUCTORDS04-13213-1EDATA SHEETLinear IC ConverterCMOSD/A Converter for Digital Tuning ..
MAX9021AXK-T-MAX9024ASD-MAX9024AUD
Micropower / Ultra-Small / Single/Dual/Quad / Single-Supply Comparators
General DescriptionThe 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.
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.
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.
Applications
FeaturesLow-Cost Solution Available in Space-Saving
SC70 Packages (Half the Size of SOT23)Low 2.8µA Supply Current3µs Propagation DelayInternal 4mV Comparator HysteresisComparator Output Swings Rail-to-Rail®2.5 to 5.5V Single-Supply Voltage RangeNo Phase Reversal for Overdriven InputsSpace-Saving Packages
5-Pin SC70 (MAX9021)
8-Pin SOT23 (MAX9022)
8-Pin µMAX (MAX9022)
14-Pin TSSOP (MAX9024)
MAX9021/MAX9022/MAX9024
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Pin Configurations19-1842; Rev 1; 7/01
Ordering InformationBattery-Powered
Portable Systems
Mobile Communications
Sensor-Signal Detection
Photodiode Preamps
Digital Line Receivers
Keyless Entry Systems
Threshold Detectors/
Discriminators
Typical Application Circuit appears at end of data sheet.Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
MAX9021/MAX9022/MAX9024
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
ABSOLUTE MAXIMUM RATINGSStresses 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.
Supply Voltage (VDDto VSS)....................................-0.3V to +6V
Voltage Inputs (IN+, IN- to VSS).................-0.3V to (VDD+ 0.3V)
Differential Input Voltage (IN+ to IN-)....................................6.6V
Output Short-Circuit Duration..................2s to Either VDDor VSS
Current into Any Pin............................................................20mA
Continuous Power Dissipation (TA= +70°C)
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
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
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
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:VODis the overdrive voltage beyond the offset and hysteresis-determined trip points.
Note 5:Rise and fall times are measured between 10% and 90% at OUT.
ELECTRICAL CHARACTERISTICS(VDD= 5V, VSS= 0, VCM= 0, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MAX9021/MAX9022/MAX9024
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Typical Operating Characteristics(VDD= 5V, VSS= 0, VCM= 0, RL= 10kΩ, CL= 15pF, VOD= 100mV, TA= +25°C, unless otherwise noted.)
MAX9021/MAX9022/MAX9024
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Typical Operating Characteristics (continued)(VDD= 5V, VSS= 0, VCM= 0, RL= 10kΩ, CL= 15pF, VOD= 100mV, TA= +25°C, unless otherwise noted.)
MAX9021/MAX9022/MAX9024
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Detailed DescriptionThe MAX9021/MAX9022/MAX9024 are single/dual/
quad, low-cost, low-power comparators that consume
only 2.8µA and provide a propagation delay, tPD, typi-
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.
Applications Information
Adding HysteresisHysteresis extends the comparator’s noise margin by
increasing the upper threshold and decreasing the
lower threshold. A voltage-divider from the compara-
tor’s output sets the trip voltage. Therefore, the trip volt-
age is related to the output voltage.
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:
1) Find the trip points of the comparator using these for-
mulas:
VTH= VREF+ ((VDD- VREF)R2) / (R1 + R2)
VTL= VREF(1 - (R2 / (R1 + R2))
where VTHis the threshold voltage at which the com-
parator switches its output from high to low as VIN
rises above the trip point. VTLis the threshold volt-
age at which the comparator switches its output from
low to high as VINdrops below the trip point.
Pin Description
MAX9021/MAX9022/MAX9024
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators2) The hysteresis band will be:
VHYS= VTH- VTL= VDD(R2 / (R1 + R2))
3) In this example, let VDD= 5V and VREF= 2.5V.
VTH= 2.5V + 2.5V(R2 / (R1 + R2))
and
VTL= 2.5V[(1 - (R2 / (R1 + R2))]
4) Select R2. In this example, we will choose 1kΩ.
5) Select VHYS. In this example, we will choose 50mV.
6) Solve for R1.
VHYS= VDD(R2 / (R1 + R2))
0.050V = 5(1000Ω/(R1 + 1000Ω)) V
where R1 ≈100kΩ, VTH= 2.525V, and VTL= 2.475V.
The above-described design procedure assumes rail-
to-rail output swing. If the output is significantly loaded,
the results should be corrected.
Board Layout and BypassingUse 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-.
Biasing for Data RecoveryDigital 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:
ƒCAR>> 1 / (2πR1C1)
where ƒCARis the fundamental carrier frequency of the
digital data stream.
