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PDF LT1714 Data sheet ( Hoja de datos )
| Número de pieza | LT1714 | |
| Descripción | Rail-to-Rail Comparators | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT1714 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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LT1713/LT1714
FEATURES
Single/Dual, 7ns, Low Power,
3V/5V/±5V Rail-to-Rail Comparators
DESCRIPTIO
s Ultrafast: 7ns at 20mV Overdrive
8.5ns 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 Low Power (Per Comparator): 5mA
s Output Latch
s Inputs Can Exceed Supplies Without Phase Reversal
s LT1713: 8-Lead MSOP Package
s LT1714: 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
The LT®1713/LT1714 are UltraFastTM 7ns, single/dual
comparators featuring rail-to-rail inputs, rail-to-rail
complementary outputs 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 LT1713/LT1714 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 LT1713/LT1714 have internal TTL/CMOS compatible
latches for retaining data at the outputs. Each latch holds
data as long as its latch pin is held high. Latch pin
hysteresis provides protection against slow moving or
noisy latch signals. The LT1713 is available in the 8-lead
MSOP package. The LT1714 is available in the 16-lead
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
1M
2k
100pF
MV-209
VARACTOR
DIODE
1M
0.047µF
C SELECT
(CHOOSE FOR CORRECT
PLL LOOP RESPONSE)
390Ω
+ Y1** 15pF 100pF
LT1713
–
2k
FREQUENCY
OUTPUT
171314 TA01
200pF
* 1% FILM RESISTOR
** NORTHERN ENGINEERING LABS C-2350N-14.31818MHz
LT1713/LT1714 Propagation Delay
vs Input Overdrive
9.0
8.5
8.0 tPD+
7.5 tPD–
7.0
6.5
VTA+
=
=
25°C
5V
V– = 0V
VSTEP = 100mV
6.0
5.5
5.0
0
10 20 30 40 50
INPUT OVERDRIVE (mV)
60
171314 TA02
1
1 page  
LT1713/LT1714
ELECTRICAL CHARACTERISTICS
Note 8: Output voltage swings are characterized and tested at V+ = 5V and
V– = 0V. They are designed and expected to meet these same
specifications at V– = – 5V.
Note 9: The input voltage range is tested under the more demanding
conditions of V+ = 5V and V– = –5V. The LT1713/LT1714 are designed
and expected to meet these specifications at V– = 0V.
Note 10: The LT1713/LT1714 voltage gain is tested at V+ = 5V and
V– = – 5V only. Voltage gain at single supply V+ = 5V and V+ = 2.7V is
guaranteed by design and correlation.
Note 11: Input offset voltage over temperature at V+ = 2.7V is guaranteed
by design and characterization.
TYPICAL PERFOR A CE CHARACTERISTICS
Input Offset Voltage
vs Temperature
2.5
V+ = 5V
2.0 V – = 0V
1.5 VCM = 2.5V
1.0
0.5
0
– 0.5
– 1.0
– 1.5
– 2.0
– 2.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
171314 G01
Propagation Delay
vs Input Common Mode Voltage
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
– 0.5
tPD+
tPD–
VTA+
=
=
25°C
5V
V – = 0V
VOD = 20mV
VSTEP = 100mV
CLOAD = 10pF
0.5 1.5 2.5 3.5 4.5 5.5
INPUT COMMON MODE (V)
171314 G04
Propagation Delay
vs Load Capacitance
14
12 tPD+
10
tPD–
8
6
4
VTA+
=
=
25°C
5V
V – = 0V
2
VCM = 2.5V
VOD = 20mV
VSTEP = 100mV
0
0 20 40 60 80 100
LOAD CAPACITANCE (pF)
120
171314 G02
Propagation Delay
vs Positive Supply Voltage
10.0
9.5
VTA–
=
=
25°C
0V
VCM = 2.5V
9.0 VOD = 20mV
VSTEP = 100mV
8.5 CLOAD = 10pF
tPD+
8.0
tPD–
7.5
7.0
6.5
6.0
0
2 4 6 8 10 12 14
POSITIVE SUPPLY VOLTAGE (V)
171314 G05
Propagation Delay
vs Temperature
16 V+ = 5V
14 V – = 0V
VCM = 2.5V
12
VOD = 20mV
VSTEP = 100mV
10 CLOAD = 10pF
8
6
4
tPD+
tPD–
2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
171314 G03
Positive Supply Current
vs Positive Supply Voltage
7.0
TA = 25°C
∆VIN = 100mV
6.5 IOUT = 0
V– = –5V
6.0
V– = 0V
5.5
5.0
4.5
4.0
2
4 6 8 10
POSITIVE SUPPLY VOLTAGE (V)
12
171314 G06
5
5 Page 
LT1713/LT1714
TYPICAL APPLICATIO S
Simultaneous Full Duplex 75Mbaud Interface
with Only Two Wires
The circuit of Figure 3 shows a simple, fully bidirectional,
differential 2-wire interface that gives good results to
75Mbaud, using the LT1714. Eye diagrams under condi-
tions of unidirectional and bidirectional communication
are shown in Figures 4 and 5. Although not as pristine as
the unidirectional performance of Figure␣ 4, the perfor-
mance under simultaneous bidirectional operation is still
excellent. Because the LT1714 input voltage range ex-
tends 100mV beyond both supply rails, the circuit works
with a full ±3V (one whole VS up or down) of ground
potential difference.
The circuit works well with the resistor values shown, but
other sets of values can be used. The starting point is the
characteristic impedance, ZO, of the twisted-pair cable.
The input impedance of the resistive network should
match the characteristic impedance and is given by:
RIN
=
2
•
RO
•
RO
R1||(R2 + R3)
+ 2 • [R1||(R2 +
R3)]
This comes out to 120Ω for the values shown. The
Thevenin equivalent source voltage is given by:
VTH
=
VS
•
(R2
(R2
+
+
R3
R3
–
+
R1)
R1)
•
RO
+
2
•
RO
[R1||
(R2
+
R3)]
750k
3V
4
14
+2
RxD
1/2
13
LE LT1714
16 –
1
3
15
750k
100k
3V
49.9Ω 7 +
5
11
TxD
49.9Ω
1/2
8
LT1714
– LE
10
12
6
9
100k
R2A
2.55k
R3A
124Ω
R3B
124Ω
R2B
2.55k
3V
R1A
499Ω
ROA
140Ω
R1B
499Ω
6-FEET
TWISTED PAIR
ZO ≈ 120Ω
DIODES: BAV99
×4
3V
R1C
499Ω
ROB
140Ω
R1D
499Ω
R2C
2.55k
R3C
124Ω
R3D
124Ω
R2D
2.55k
Figure 3. 75Mbaud Full Duplex Interface on Two Wires
750k
3V
2+
4
14
1/2
1
LT1714 LE
– 16
13
15
3
100k
750k
RxD
3V
5
11
+7
1/2
12
6
LT1714
LE –
8
10
9
49.9Ω
49.9Ω
TxD
100k
171314 F03
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1714.PDF ] | |
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