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PDF LT1720 Data sheet ( Hoja de datos )
| Número de pieza | LT1720 | |
| Descripción | 4ns/ 150MHz Dual Comparator with Independent Input/Output Supplies | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT1720 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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FEATURES
s UltraFast: 4.5ns at 20mV Overdrive
7ns at 5mV Overdrive
s Low Power: 4mA per Comparator
s Optimized for 3V and 5V Operation
s Pinout Optimized for High Speed Ease of Use
s Input Voltage Range Extends 100mV
Below Negative Rail
s TTL/CMOS Compatible Rail-to-Rail Outputs
s Internal Hysteresis with Specified Limits
s Low Dynamic Current Drain; 15µA/(V-MHz),
Dominated by Load In Most Circuits
U
APPLICATIO S
s High Speed Differential Line Receiver
s Crystal Oscillator Circuits
s Window Comparators
s Threshold Detectors/Discriminators
s Pulse Stretchers
s Zero-Crossing Detectors
s High Speed Sampling Circuits
TYPICAL APPLICATIO
2.7V to 6V Crystal Oscillator with TTL/CMOS Output
2.7V TO 6V
2k
1MHz TO 10MHz
CRYSTAL (AT-CUT)
220Ω
620Ω
GROUND
+ CASE
C1
1/2 LT1720
–
2k
0.01µF
1.8k
OUTPUT
1720/21 TA01
LT1720/LT1721
Dual/Quad,
4.5ns, Single Supply
3V/5V Comparators
with Rail-to-Rail Outputs
DESCRIPTIO
The LT®1720/LT1721 are UltraFastTM dual/quad compara-
tors optimized for single supply operation, with a supply
voltage range of 2.7V to 6V. The input voltage range extends
from 100mV below ground to 1.2V below the supply voltage.
Internal hysteresis makes the LT1720/LT1721 easy to use
even with slow moving input signals. The rail-to-rail outputs
directly interface to TTL and CMOS. Alternatively, the sym-
metric output drive can be harnessed for analog applications
or for easy translation to other single supply logic levels.
The LT1720 is available in the 8-pin MSOP and SO packages;
three pins per comparator plus power and ground. The
LT1721 is available in the 16-pin SSOP and S packages.
The pinouts of the LT1720/LT1721 minimize parasitic effects
by placing the most sensitive inputs (inverting) away from the
outputs, shielded by the power rails. The LT1720/LT1721 are
ideal for systems where small size and low power are
paramount.
, LTC and LT are registered trademarks of Linear Technology Corporation.
UltraFast is a trademark of Linear Technology Corporation.
Propagation Delay vs Overdrive
8
7
6
RISING EDGE
(tPDLH)
5
25°C
VSTEP = 100mV
VCC = 5V
CLOAD = 10pF
4
FALLING EDGE
3 (tPDHL)
2
1
0
0 10 20 30 40 50
OVERDRIVE (mV)
1720/21 TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Output Low Voltage
vs Load Current
0.5
VCC = 5V
VCM = 1V
VIN = – 15mV
0.4 125°C
VCC = 2.7V
125°C
0.3
– 55°C
25°C
0.2
0.1
0
4 8 12 16
OUTPUT SINK CURRENT (mA)
20
1720/21 G10
Output High Voltage
vs Load Current
0.0
125°C
– 0.2
VCC = 5V
VCM = 1V
VIN = 15mV
– 55°C
– 0.4 25°C
– 0.6
– 0.8
– 1.0
0
25°C
VCC = 2.7V
4 8 12 16
OUTPUT SOURCE CURRENT (mA)
20
1720/21 G11
LT1720/LT1721
Supply Current vs Frequency
10
25°C
9 VCC = 5V
8
CLOAD = 20pF
7
6
NO LOAD
5
4
3
0 10
20 30 40
FREQUENCY (MHz)
1720/21 G12
PIN FUNCTIONS
LT1720
+IN A (Pin 1): Noninverting Input of Comparator A.
–IN A (Pin 2): Inverting Input of Comparator A.
–IN B (Pin 3): Inverting Input of Comparator B.
+IN B (Pin 4): Noninverting Input of Comparator B.
GND (Pin 5): Ground.
OUT B (Pin 6): Output of Comparator B.
OUT A (Pin 7): Output of Comparator A.
VCC (Pin 8): Positive Supply Voltage.
LT1721
–IN A (Pin 1): Inverting Input of Comparator A.
+IN A (Pin 2): Noninverting Input of Comparator A.
GND (Pins 3, 6): Ground.
OUT A (Pin 4): Output of Comparator A.
OUT B (Pin 5): Output of Comparator B.
+IN B (Pin 7): Noninverting Input of Comparator B.
–IN B (Pin 8): Inverting Input of Comparator B.
–IN C (Pin 9): Inverting Input of Comparator C.
+IN C (Pin 10): Noninverting Input of Comparator C.
VCC (Pins 11, 14): Positive Supply Voltage.
OUT C (Pin 12): Output of Comparator C.
OUT D (Pin 13): Output of Comparator D.
+IN D (Pin 15): Noninverting Input of Comparator D.
–IN D (Pin 16): Inverting Input of Comparator D.
5
5 Page 
APPLICATIONS INFORMATION
5V
180Ω
LSTTL 270Ω
5V
DO NOT USE FOR LT1720/LT1721
LEVEL TRANSLATION. SEE TEXT
10KH/E
820Ω
(a) STANDARD TTL TO PECL TRANSLATOR
VCC
1/2 LT1720
R2
R1
R3
VCC R1 R2 R3
10KH/E 5V OR 5.2V 510Ω 180Ω 750Ω
100K/E 4.5V 620Ω 180Ω 510Ω
LT1720/LT1721
(b) LT1720/LT1721 OUTPUT TO PECL TRANSLATOR
VCC
3V
1/2 LT1720
R2
R1
R4 R3
VCC R1 R2 R3 R4
10KH/E 5V OR 5.2V 300Ω 180Ω OMIT 560Ω
100K/E 4.5V 330Ω 180Ω 1500Ω 1000Ω
(c) 3V LT1720/LT1721 OUTPUT TO PECL TRANSLATOR
VCC
1/2 LT1720
R4
R1
R2 R3
VEE
(d) LT1720/LT1721 OUTPUT TO STANDARD ECL TRANSLATOR
ECL FAMILY VEE
10KH/E – 5.2V
100K/E – 4.5V
VCC R1 R2 R3 R4
5V 560Ω 270Ω 330Ω 1200Ω
3V 270Ω 510Ω 300Ω 330Ω
5V 680Ω 270Ω 300Ω 1500Ω
3V 330Ω 390Ω 270Ω 430Ω
1720/21 F05
Figure 5
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LT1720.PDF ] | |
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