LT1671_15 Datasheet, PDF (1/12 Pages) Linear Technology – 60ns, Low Power, Single Supply, Ground-Sensing Comparator

LT1671
60ns, Low Power,
Single Supply, Ground-Sensing
Comparator
FEATURES
DESCRIPTIO
s _{Low Power: 450µA}
s _{Fast: 60ns at 20mV Overdrive}
85ns at 5mV Overdrive
s _{Low Offset Voltage: 0.8mV}
s _{Operates Off Single 5V or Dual ±5V Supplies}
s _{Input Common Mode Extends to Negative Supply}
s _{No Minimum Input Slew Rate Requirement}
s _{Complementary TTL Outputs}
s _{Inputs Can Exceed Supplies without Phase Reversal}
s _{Pin Compatible with LT1394, LT1016 and LT1116}
s _{Output Latch Capability}
s _{Available in 8-Lead MSOP and SO Packages}
U
APPLICATIO S
s _{High Speed A/D Converters}
s _{Zero-Crossing Detectors}
s _{Current Sense for Switching Regulators}
s _{Extended Range V/F Coverters}
s _{Fast Pulse Height/Width Discriminators}
s _{High Speed Triggers}
s _{Line Receivers}
s _{High Speed Sampling Circuits}
The LT^®1671 is a low power 60ns comparator with comple-
mentary outputs and latch. The input common mode
range extends from 1.5V below the positive supply down
to the negative supply rail. Like the LT1394, LT1016 and
LT1116, this comparator has complementary outputs
designed to interface directly to TTL or CMOS logic. The
LT1671 may operate from either a single 5V supply or dual
±5V supplies. Low offset voltage specifications and high
gain allow the LT1671 to be used in precision applications.
The LT1671 is designed for improved speed and stability
for a wide range of operating conditions. The output stage
provides active drive in both directions for maximum
speed into TTL, CMOS or passive loads with minimal
cross-conduction current. Unlike other fast comparators,
the LT1671 remains stable even for slow transitions
through the active region, which eliminates the need to
specify a minimum input slew rate.
The LT1671 has an internal, TTL/CMOS compatible latch
for retaining data at the outputs. The latch holds data as
long as the LATCH pin is held high. Device parameters
such as gain, offset and negative power supply current are
not significantly affected by variations in negative supply
voltage.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
1MHz Crystal Oscillator
5V
2k
1MHz CRYSTAL
(AT-CUT)
+
LT1671
2k
–
2k
0.068µF
OUTPUT
1¹6⁶7⁷1¹T^TA^A0⁰1¹
Propagation Delay vs Overdrive
140
V_S = ±5V
120
V_STEP = 100mV
T_A = 25°C
R_L = 1M
100
80
FALLING EDGE (t_PDHL)
60
40
20
0
RISING EDGE (t_PDLH)
10
20
30
40
50
OVERDRIVE (mV)
1671 TA02
1