LT685CH Linear Technology, LT685CH Datasheet

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LT685CH

Manufacturer Part Number
LT685CH
Description
HI SPEED COMPARATOR ECL OUTPUT
Manufacturer
Linear Technology
Type
with Latchr
Datasheet

Specifications of LT685CH

Number Of Elements
1
Output Type
Complementary, ECL
Mounting Type
Through Hole
Package / Case
TO-205-10, TO-5-10 Metal Can
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Ultrafast (5.5ns typ)
Complementary ECL Output
50Ω Line Driving Capability
Low Offset Voltage
Output Latch Capability
External Hysteresis Control
Pin Compatible with Am685
High Speed A-to-D Converters
High Speed Sampling Circuits
Oscillators
V
IN
ENABLE
LATCH
Comparator with Hysteresis
6V
U
+
V
LT685
–5.2V
+
V
GND1
HYSTERESIS
R
GND2
U
R
V
L
T
LT685 • TA01
R
L
Q
Q
DESCRIPTIO
The LT
inputs and complementary outputs fully compatible with
ECL logic levels. The output current capability is adequate
for driving transmission lines terminated in 50Ω. The low
input offset and high resolution make this comparator
ideally suited for analog-to-digital signal processing
applications.
A latch function is provided to allow the comparator to be
used in a sample-hold mode. When the latch enable input
is ECL high, the comparator functions normally. When the
latch enable is driven low, the comparator outputs are
locked in their existing logical states. If the latch function
is not used, the latch enable must be connected to ground
or ECL high.
The device is pin-compatible with the Am685. Hysteresis
has been added to improve switching time with slow input
signals as well as to minimize oscillation. A single resistor
between the hysteresis pin and V
voltage as more current is drawn. If hysteresis is not
required, the pin can be left unconnected.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
High Speed Comparator
685 is an ultrafast comparator with differential
100
10
1
100
200
U
500
RESISTANCE (Ω)
Hysteresis
1k
HYSTERESIS IS ZERO
IF PIN LEFT OPEN
2k
adds input hysteresis
5k
LT685 • TA02
10k
LT685
1
685fa

Related parts for LT685CH

LT685CH Summary of contents

Page 1

... A single resistor between the hysteresis pin and V voltage as more current is drawn. If hysteresis is not required, the pin can be left unconnected. , LTC and LT are registered trademarks of Linear Technology Corporation. 100 ...

Page 2

... Power Dissipation (Note 2) ................................ 500mW Operating Temperature LT685C ......................................... –30°C ≤ T – LT685M (OBSOLETE) ................. –55°C ≤ T – ORDER PART NUMBER GND # LT685CH NON-INVERTING INPUT LT685MH INVERTING INPUT NC LATCH ENABLE NC – V J16 PACKAGE (HERMETIC) OBSOLETE PACKAGE Consider the N16 Package as an Alternate Source A ...

Page 3

ELECTRICAL CHARACTERISTICS erature ranges, unless otherwise noted. SYMBOL PARAMETER CONDITIONS V Input Offset Voltage /dT Input Offset Voltage Drift (Note Input Offset Current Input Bias Current Input Resistance ...

Page 4

LT685 U SWITCHI G CHARACTERISTICS SYMBOL PARAMETER CONDITIONS t Propagation Delay T PD (Note Latch Enable to T PD(E) Output Delay T (Note Minimum Set-Up Time T S (Note Minimum ...

Page 5

W W SCHE ATIC DIAGRA R2 R1 300Ω 300Ω NONINVERTING Q1 INPUT Q5 INVERTING Q2 INPUT LATCH Q9 Q10 ENABLE Q12 Q11 R11 R12 430Ω 200Ω HYSTERESIS R23 1.7k Q14 R6 Q33 525Ω D4 ...

Page 6

LT685 W U TYPICAL PERFOR A CE CHARACTERISTICS Propagation Delays as a Function of Temperature 5mV 2.5mV 20mV OD 2 –50 – TEMPERATURE (°C) ...

Page 7

... NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights Package 16-Lead CERDIP (Narrow ...

Page 8

... MIN 0.125 0.100 (3.175) (2.54) MIN BSC www.linear.com 0.770* (19.558) MAX 0.045 – 0.065 (1.143 – 1.651) 0.065 (1.651) TYP 0.018 ± 0.003 (0.457 ± 0.076) N16 1098 LW/TP 0902 1K REV A • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 1988 685fa ...

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