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PDF LTC6993-4 Data sheet ( Hoja de datos )
| Número de pieza | LTC6993-4 | |
| Descripción | Monostable Pulse Generator | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC6993-1/LTC6993-2
LTC6993-3/LTC6993-4
TimerBlox: Monostable
Pulse Generator (One Shot)
FEATURES
DESCRIPTION
n Pulse Width Range: 1µs to 33.6 Seconds
n Configured with 1 to 3 Resistors
n Pulse Width Max Error:
– <2.3% for Pulse Width > 512µs
– <3.4% for Pulse Width of 8µs to 512µs
– <4.9% for Pulse Width of 1µs to 8µs
n Four LTC6993 Options Available:
– Rising-Edge or Falling-Edge Trigger
– Retriggerable or Non-Retriggerable
n Configurable for Positive or Negative Output Pulse
n Fast Recovery Time
n 2.25V to 5.5V Single Supply Operation
n 70µA Supply Current at 10µs Pulse Width
n 500µs Start-Up Time
n CMOS Output Driver Sources/Sinks 20mA
n –55°C to 125°C Operating Temperature Range
n Available in Low Profile (1mm) SOT-23 (ThinSOT™)
and 2mm × 3mm DFN
APPLICATIONS
n Watchdog Timer
n Frequency Discriminators
n Missing Pulse Detection
n Envelope Detection
n High Vibration, High Acceleration Environments
n Portable and Battery-Powered Equipment
L, LT, LTC, LTM, Linear Technology, TimerBlox and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
The LTC®6993 is a monostable multivibrator (also known
as a “one-shot” pulse generator) with a programmable
pulse width of 1µs to 33.6 seconds. The LTC6993 is part
of the TimerBlox® family of versatile silicon timing devices.
A single resistor, RSET, programs an internal master os-
cillator frequency, setting the LTC6993’s time base. The
output pulse width is determined by this master oscillator
and an internal clock divider,
settings from 1 to 221.
NDIV ,
programmable
to
eight
tOUT
=
NDIV •RSET
50kΩ
•1µs, NDIV
= 1, 8, 64,...,221
The output pulse is initiated by a transition on the trigger
input (TRIG). Each part can be configured to generate posi-
tive or negative output pulses. The LTC6993 is available
in four versions to provide different trigger signal polarity
and retrigger capability.
DEVICE
LTC6993-1
LTC6993-2
LTC6993-3
LTC6993-4
INPUT POLARITY
Rising-Edge
Rising-Edge
Falling-Edge
Falling-Edge
RETRIGGER
No
Yes
No
Yes
The LTC6993 also offers the ability to dynamically adjust
the width of the output pulse via a separate control voltage.
For easy configuration of the LTC6993, download the
TimerBlox Designer tool at www.linear.com/timerblox.
TYPICAL APPLICATION
Envelope Detector
MODULATED
CARRIER
TRIG OUT
LTC6993-2
GND V+
SIGNAL
ENVELOPE
3.3V
0.1µF
RSET
800k
SET
DIV
69931234 TA01a
TRIG
2V/DIV
OUT
2V/DIV
80kHz CARRIER
16µs
50µs/DIV
69931234 TA01b
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1
1 page  
LTC6993-1/LTC6993-2
LTC6993-3/LTC6993-4
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are
(NDIV = 1 to 221), RSET = 50k to 800k, RLOAD = ∞,
CatLOTAAD==255p°FC.uTnelestsscoonthdeitriwonisseanreotVe+d.=
2.25V
to
5.5V,
TRIG
=
0V,
DIVCODE
=
0
to
15
SYMBOL
tPD
PARAMETER
Trigger Propagation Delay
tWIDTH
tARM
tRETRIG
tr
Minimum Recognized TRIG Pulse Width
Recovery Time (LTC6993-1/LTC6993-3)
Time Between Trigger Signals
(LTC6993-2/LTC6993-4)
Output Rise Time (Note 8)
tf Output Fall Time (Note 8)
CONDITIONS
V+ = 5.5V
V+ = 3.3V
V+ = 2.25V
V+ = 3.3V
NDIV = 1
NDIV > 1
V+ = 5.5V
V+ = 3.3V
V+ = 2.25V
V+ = 5.5V
V+ = 3.3V
V+ = 2.25V
V+ = 3.3V
V+ = 3.3V
MIN TYP MAX
11
17
28
5
–4
10
50
1.1
1.7
2.7
1.0
1.6
2.4
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC6993C is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 3: The LTC6993C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6993C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but it is not tested or
QA sampled at these temperatures. The LTC6993I is guaranteed to meet
specified performance from –40°C to 85°C. The LTC6993H is guaranteed
to meet specified performance from –40°C to 125°C. The LTC6993MP is
guaranteed to meet specified performance from –55°C to 125°C.
Note 4: Pulse width accuracy is defined as the deviation from the tOUT
equation, assuming RSET is used to program the pulse width.
Note 5: See Operation section, Table 1 and Figure 2 for a full explanation
of how the DIV pin voltage selects the value of DIVCODE.
Note 6: The TRIG pin has hysteresis to accommodate slow rising or falling
signals. The threshold voltages are proportional to V+. Typical values can
be estimated at any supply voltage using:
VTRIG(RISING) ≈ 0.55 • V+ + 185mV and
VTRIG(FALLING) ≈ 0.48 • V+ – 155mV
Note 7: To conform to the Logic IC Standard, current out of a pin is
arbitrarily given a negative value.
Note 8: Output rise and fall times are measured between the 10% and the
90% power supply levels with 5pF output load. These specifications are
based on characterization.
Note 9: Settling time is the amount of time required for the output to settle
within ±1% of the final pulse width after a 0.5× or 2× change in ISET .
Note 10: Jitter is the ratio of the deviation of the output pulse width to the
mean of the pulse width. This specification is based on characterization
and is not 100% tested.
69931234fb
5
5 Page 
BLOCK DIAGRAM (S6 package pin numbers shown)
LTC6993-1/LTC6993-2
LTC6993-3/LTC6993-4
5
V+
R1
4 DIV
4-BIT A/D
CONVERTER
R2
DIGITAL
FILTER
1 TRIG
TRIGGER/
RETRIGGER
LOGIC
MASTER OSCILLATOR
tMASTER =
1µs
50kΩ
•
VSET
ISET
MCLK
PROGRAMMABLE DIVIDER
÷1, 8, 64, 512, 4096,
215, 218, 221
POL
S
Q
R
OUTPUT
POLARITY
OUT 6
tOUT
HALT OSCILLATOR
IF ISET < 500nA
ISET
VSET = 1V
SET
3
ISET RSET
+
–
POR
1V –+
GND
2
69931234 BD
69931234fb
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LTC6993-4.PDF ] | |
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