FEATURES
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LT1394
7ns, Low Power,
Single Supply, Ground-Sensing
Comparator
DESCRIPTIO
The LT
廬
1394 is an UltraFast (7ns) 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 LT1016, LT1116 and LT1671,
this comparator has complementary outputs designed to
interface directly to TTL or CMOS logic. The LT1394 may
operate from either a single 5V supply or dual
鹵5V
supplies.
Low offset voltage specifications and high gain allow the
LT1394 to be used in precision applications.
The LT1394 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-conduc-
tion current. Unlike other fast comparators, the LT1394
remains stable even for slow transitions through the active
region, which eliminates the need to specify a minimum input
slew rate.
The LT1394 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.
UltraFast
TM
: 7ns
Low Power: 6mA
Low Offset Voltage: 0.8mV
Operates Off Single 5V or Dual
鹵5V
Supplies
Input Common Mode Extends to Negative Supply
No Minimum Input Slew Rate Requirement
Complementary TTL Outputs
Inputs Can Exceed Supplies without Phase Reversal
Pin Compatible with LT1016, LT1116 and LT1671
Output Latch Capability
Available in 8-Lead MSOP and SO Packages
APPLICATIO S
s
s
s
s
s
s
s
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High Speed A/D Converters
Zero-Crossing Detectors
Current Sense for Switching Regulators
Extended Range V/F Coverters
Fast Pulse Height/Width Discriminators
High Speed Triggers
Line Receivers
High Speed Sampling Circuits
, LTC and LT are registered trademarks of Linear Technology Corporation.
UltraFast is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
45MHz Single Supply Adaptive Trigger
2k
3
Q1
5V
2
0.005碌F
5V
12
6
1
5
4
Q2
3M
TIME (ns)
+
A1
LT1227
500pF
5V
鈥?/div>
13
2k
5V
36鈩?/div>
750鈩?/div>
510鈩?/div>
Q3
15
0.1碌F
2k
14 12
11
10
Q4
0.005碌F
3M
A2
LT1006
Q1, Q2, Q3, Q4 = CA3096 ARRAY:
TIE SUBSTRATE (PIN 16) TO GROUND
= 1N4148
470鈩?/div>
10碌F
0.1碌F
100碌F
INPUT
鈥?/div>
470鈩?/div>
0.1碌F
+
+
+
LT1394
U
+
鈥?/div>
U
U
Propagation Delay vs
Input Overdrive
T
A
= 25擄C
V
STEP
= 100mV
V
S
=
鹵5V
10
8
t
PDLH
6
4
2
0
t
PDHL
0
10
TRIGGER
OUT
1394 F18
20
30
OVERDRIVE (mV)
40
50
1394 TA02
1
LT1394IS8 產(chǎn)品屬性
LT1394
100
集成電路 (IC)
線性 - 比較器
UltraFast™
帶鎖銷
1
CMOS，補(bǔ)充型，TTL
-
2.5mV @ ±5V
4.5µA @ ±5V
20mA
8.5mA
100dB CMRR，100dB PSRR
9ns
-
-40°C ~ 85°C
8-SOIC（0.154"，3.90mm 寬）
表面貼裝
管件
LT1394IS8相關(guān)型號PDF文件下載
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