LT1711/LT1712 Single/Dual 4.5ns, 3V/5V/±5V, Rail-to-Rail Comparators UFEATURESDESCRIPTIO ■ Ultrafast: 4.5ns at 20mV Overdrive The LT®1711/LT1712 are UltraFastTM 4.5ns comparators 5.5ns at 5mV Overdrive featuring rail-to-rail inputs, rail-to-rail complementary out- ■ Rail-to-Rail Inputs puts and an output latch. Optimized for 3V and 5V power ■ Rail-to-Rail Complementary Outputs (TTL/CMOS supplies, they operate over a single supply voltage range Compatible) from 2.4V to 12V or from ±2.4V to ±6V dual supplies. ■ Specified at 2.7V, 5V and ± 5V Supplies The LT1711/LT1712 are designed for ease of use in a ■ Output Latch variety of systems. In addition to wide supply voltage ■ Inputs Can Exceed Supplies Without Phase Reversal flexibility, rail-to-rail input common mode range extends ■ LT1711: 8-Lead MSOP Package 100mV beyond both supply rails, and the outputs are ■ LT1712: 16-Lead Narrow SSOP Package protected against phase reversal for inputs extending U further beyond the rails. Also, the rail-to-rail inputs may be APPLICATIO S taken to opposite rails with no significant increase in input ■ current. The rail-to-rail matched complementary outputs High Speed Automatic Test Equipment ■ interface directly to TTL or CMOS logic and can sink 10mA Current Sense for Switching Regulators ■ to within 0.5V of GND or source 10mA to within 0.7V of V +. Crystal Oscillator Circuits ■ High Speed Sampling Circuits The LT1711/LT1712 have internal TTL/CMOS compatible ■ High Speed A/D Converters latches for retaining data at the outputs. Each latch holds ■ Pulse Width Modulators data as long as the latch pin is held high. Latch pin ■ Window Comparators hysteresis provides protection against slow moving or ■ Extended Range V/F Converters noisy latch signals. The LT1711 is available in the 8-pin ■ Fast Pulse Height/Width Discriminators MSOP package. The LT1712 is available in the 16-pin ■ Line Receivers narrow SSOP package. ■ High Speed Triggers , LTC and LT are registered trademarks of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. UTYPICAL APPLICATIOA 4 × NTSC Subcarrier Voltage-Tunable Crystal Oscillator 5V LT1711/LT1712 Propagation Delay 47k* vs Input Overdrive 1N4148 LT1004-2.5 3.9k* VIN 0V TO 5V 6.0 1M 1M* 1k* TA = 25°C V+ = 5V 5.5 V – = 0V 5V MV-209 V 1M VARACTOR STEP = 100mV 0.047µF DIODE 1M C SELECT 5.0 2k + 100pF (CHOOSE FOR CORRECT tPD PLL LOOP RESPONSE) 4.5 390Ω Y1** 15pF 100pF t – + PD 4.0 LT1711 PROPAGATION DELAY (ns) 3.5 – FREQUENCY OUTPUT 171112 TA01 2k 3.0 0 10 20 30 40 50 60 200pF INPUT OVERDRIVE (mV) * 1% FILM RESISTOR ** NORTHERN ENGINEERING LABS C-2350N-14.31818MHz 171112 TA02 1
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