LT1711 Datasheet, PDF (1/12 Pages) Linear Technology – Single/Dual 4.5ns, 3V/5V, Rail-to-Rail Comparators

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