Datasheet LMC7221 (Texas Instruments) - 10

LMC7221
SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013
www.ti.com Figure 18. LAYOUT CONSIDERATIONS
The LMC7221 is not an especially fast comparator, so high speed design practices are not required. The LMC7221 is capable of operating with very high impedance inputs, so precautions should be taken to reduce noise pickup with high impedance (∼ 100 kΩ and greater) designs and in electrically noisy environments. Keeping high value resistors close to the LMC7221 and minimizing the size of the input nodes is a good practice. With multilayer designs, try to avoid long loops which could act as inductors (coils). Sensors which are not close to the comparator may need twisted pair or shielded connections to reduce noise.
PUSH-PULL OUTPUTS, DUAL VERSIONS
The LMC7211 is a comparator similar to the LMC7221, but with push-pull outputs which can source current. The performance of the LMC7221 is available in a dual device. Please see the LMC6772 datasheet. For a dual device with push-pull outputs, please see the LMC6762 datasheet.
Rail-to-Rail Input Low Power Comparators— Push-Pull Output
LMC7221 5-Pin SOT-23, 8-Pin SOIC Single LMC6762 8-Pin SOIC Dual
Open Drain Output
LMC7221 5-Pin SOT-23, 8-Pin SOIC Single LMC6772 8-Pin SOIC Dual
ADDITIONAL 5-Pin SOT-23 TINY DEVICES
TI has additional parts available in the space saving SOT-23 Tiny package, including amplifiers, voltage references, and voltage regulators, including the following: 1 MHz gain-bandwidth rail-to-rail input and output amplifier—high input impedance and high gain 700 μA typical
LMC7101
current 2.7V, 3V, 5V and 15V specifications. Low power 50 kHz gain-bandwidth rail-to-rail input and output amplifier with 25 μA typical current specified at 2.7V,
LMC7111
3.0V, 3.3V, 5V and 10V.
LM7131
Tiny Video amp with 70 MHz gain bandwidth 3V, 5V and ±5V specifications.
LP2980
Micropower SOT 50 mA Ultra Low-Dropout Regulator.
LM4040
Precision micropower shunt voltage reference. Fixed voltages of 2.500V, 4.096V, 5.000V, 8.192V and 10.000V.
LM4041
Precision micropower shut voltage reference 1.225V and adjustable.
LM385
Low current voltage reference. Fixed Voltages of 1.2V and 2.5V. 10 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LMC7221 Document Outline FEATURES Applications DESCRIPTION Connection Diagram Absolute Maximum Ratings Operating Ratings 2.7V Electrical Characteristics 5.0V and 15.0V Electrical Characteristics Leakage Characteristics AC Electrical Characteristics Typical Performance Characteristics Application Information BENEFITS OF THE LMC7221 TINY COMPARATOR Size Height Simplified Board Layout Low Supply Current Wide Voltage Range Digital Outputs Representing Signal Level Open Drain Output Driving LEDs (Light Emitting Diodes) Input range to Beyond Rail to Rail Zero Crossing Detector Low Input Currents and High Input Impedance Direct Sensor Interfacing LOW VOLTAGE OPERATION OPEN DRAIN OUTPUT Output Stage OUTPUT SHORT CIRCUIT CURRENT INPUT PROTECTION LAYOUT CONSIDERATIONS PUSH-PULL OUTPUTS, DUAL VERSIONS ADDITIONAL 5-Pin SOT-23 TINY DEVICES SPICE MACROMODEL Revision History