ltc6993-1

Manufacturer Part Numberltc6993-1
DescriptionElectrical Specifications Subject To Change
ManufacturerLinear Technology Corporation
ltc6993-1 datasheet
 
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FeaTures
Pulse Width Range: 1µs to 33.6 Seconds
n
Configured with 1 to 3 Resistors
n
Pulse Width Max Error:
n
– <2.3% for Pulse Width > 512µs
– <3.4% for Pulse Width of 8µs to 512µs
– <4.9% for Pulse Width of 1µs to 8µs
Four LTC6993 Options Available:
n
– Rising-Edge or Falling-Edge Trigger
– Retriggerable or Non-Retriggerable
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
–40°C to 125°C Operating Temperature Range
n
Available in Low Profile (1mm) SOT-23 (ThinSOT™)
n
and 2mm × 3mm DFN
applicaTions
Watchdog Timer
n
Frequency Discriminators
n
Missing Pulse Detection
n
Envelope Detection
n
High Vibration, High Acceleration Environments
n
Portable and Battery-Powered Equipment
n
Typical applicaTion
Envelope Detector
MODULATED
TRIG
OUT
CARRIER
LTC6993-2
3.3V
GND
V+
SET
DIV
R
SET
800k
69931234 TA01a
Electrical Specifications Subject to Change
LTC6993-1/LTC6993-2
LTC6993-3/LTC6993-4
TimerBlox: Monostable
Pulse Generator (One Shot)
DescripTion
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, R
master oscillator frequency. The output pulse width is deter-
mined by this master oscillator and an internal clock divider,
N
, programmable to eight settings from 1 to 2
DIV
N
DIV
=
t
OUT
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
The LTC6993 also offers the ability to dynamically adjust the
width of the output pulse via a separate control voltage.
The LTC6993 is available in the 6-lead SOT-23 (ThinSOT)
and 6-lead 2mm × 3mm DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
TimerBlox and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
SIGNAL
TRIG
ENVELOPE
2V/DIV
0.1µF
OUT
2V/DIV
, programs the LTC6993’s internal
SET
21
R
21
SET
1
µs
,
N
= 1, 8, 64,...,2
DIV
50
k
INPUT POLARITY
RETRIGGER
Rising-Edge
No
Rising-Edge
Yes
Falling-Edge
No
Falling-Edge
Yes
80kHz CARRIER
16µs
50µs/DIV
69931234 TA01b
.
69931234p


ltc6993-1 Summary of contents

  • Page 1

    ... 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 The LTC6993 also offers the ability to dynamically adjust the width of the output pulse via a separate control voltage. ...

  • Page 2

    ... LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 absoluTe MaxiMuM raTings Supply Voltage (V+) to GND ........................................6V Maximum Voltage on Any Pin ................ (GND – 0.3V) ≤ V Operating Temperature Range (Note 2) LTC6993C ............................................–40°C to 85°C LTC6993I .............................................–40°C to 85°C LTC6993H .......................................... –40°C to 125°C pin conFiguraTion TOP VIEW ...

  • Page 3

    ... Test conditions are 5k 5pF unless otherwise noted. LOAD CONDITIONS N ≥ 512 DIV 8 ≤ N ≤ 64 DIV (LTC6993-1 or LTC6993-2) DIV (LTC6993-3 or LTC6993-4) DIV N ≥ 512 DIV N ≤ 64 DIV + N ≥ 512 V = 4.5V to 5.5V ...

  • Page 4

    ... LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 elecTrical characTerisTics temperature range, otherwise specifications are 50k to 800k, R DIV SET LOAD SYMBOL PARAMETER Power Supply + V Operating Supply Voltage Range Power-On Reset Voltage I Supply Current (Idle) S(IDLE) Analog Inputs V Voltage at SET Pin SET ∆ ...

  • Page 5

    ... DIV SET LOAD SYMBOL PARAMETER t Trigger Propagation Delay PD t Minimum Recognized TRIG Pulse Width WIDTH t Recovery Time (LTC6993-1/LTC6993-3) ARM t Time Between Trigger Signals RETRIG (LTC6993-2/LTC6993-4) t Output Rise Time (Note Output Fall Time (Note 8) f Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device ...

  • Page 6

    ... LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 Typical perForMance characTerisTics + V = 3.3V 200k and T = 25°C unless otherwise noted. SET A t Error vs Temperature OUT ( DIV t Error vs Temperature OUT (8 ≤ N ≤ 64) DIV t Error vs Temperature OUT (N ≥ 512) DIV  t Error vs Temperature OUT ( DIV t Error vs Temperature OUT (8 ≤ ...

  • Page 7

    ... SET A t Error vs DIVCODE OUT t Error OUT SET DIV t Drift vs Supply Voltage OUT ( DIV LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 t Error vs DIVCODE OUT t Error ≤ N ≤ 64) OUT SET DIV t Drift vs Supply Voltage OUT (8 ≤ N ≤ 64) DIV t ...

  • Page 8

    ... LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 Typical perForMance characTerisTics + V = 3.3V 200k and T = 25°C unless otherwise noted. SET A V Drift vs I SET SET 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 REFERENCED 10µA SET –1 (µA) SET 69931234 G19 Typical V Distribution SET 250 2 LOTS ...

  • Page 9

    ... Rise and Fall Time vs Supply Voltage 3.0 C LOAD 2.5 2.0 t RISE 1.5 t FALL 1.0 0 SUPPLY VOLTAGE (V) LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 Typical I Current Limit vs V SET 1000 SET PIN SHORTED TO GND OUT 800 600 400 200 0 100 SUPPLY VOLTAGE (V) 69931234 G29 Output Resistance vs Supply Voltage ...

  • Page 10

    ... The LTC6993-2 and LTC6993-4 are retriggerable, allowing current SET the pulse width to be extended by additional trigger signals that occur while the output is active. The LTC6993-1/ LTC6993-3 will ignore additional trigger inputs until the output pulse has terminated. GND (Pin 5/Pin 2): Ground. Tie to a low inductance ground plane for best performance ...

  • Page 11

    ... SET I SET 1µs V SET PROGRAMMABLE DIVIDER = • MCLK 50k I SET ÷1, 8, 64, 512, 4096 POR I SET + – – SET SET GND SET LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 POL S OUTPUT OUT Q 6 POLARITY R 69931234 BD t OUT 69931234p  ...

  • Page 12

    ... LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 operaTion The LTC6993 is built around a master oscillator with a 1µs minimum period. The oscillator is controlled by the SET pin current (I ) and voltage (V SET SET conversion factor that is accurate to ±1.7% under typical conditions µs SET t = • MASTER 50 Ω ...

  • Page 13

    ... POL BIT = 0.5• V INCREASING V DIV Figure 2. Pulse Width Range and POL Bit vs DIVCODE LTC6993-1/LTC6993-2 LTC6993-3/LTC6993 DIV Short ≤ 0.03125 ±0.015 976 102 0.09375 ±0.015 976 182 0.15625 ±0.015 280 0.21875 ± ...

  • Page 14

    ... Successive trigger signals can extend the pulse width in- definitely. Consequtive trigger signals must be separated recognized. RETRIG TRIG t PD OUT t OUT Figure 3. Non-Retriggering Timing Diagram (LTC6993-1, POL = 0) t WIDTH TRIG t PD OUT t OUT Figure 4. Retriggering Timing Diagram (LTC6993-2, POL = 0)  ...

  • Page 15

    ... POL = 0) OUT simply remains low. At this point, the LTC6993 is ready to respond to rising/falling edges on the TRIG input 69931234 F05a TRIG OUT 4µs 69931234 F05b LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 . The OUT pin START ): DIV = 500 • t MASTER + . Less than 100pF will not ...

  • Page 16

    ... LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 applicaTions inForMaTion Basic Operation The simplest and most accurate method to program the LTC6993 is to use a single resistor, R SET and GND pins. The design procedure is a four step process. Step 1: Select the POL Bit Setting. The LTC6993 can generate positive or negative output pulses, depending on the setting of the POL bit. The POL bit is the DIVCODE MSB, so any DIVCODE ≥ ...

  • Page 17

    ... SET 1/2 LTC6078 – OUT V REF MOD V LTC1659 OUT R SET GND Figure 9. Digitally Controlled Pulse Width LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 TRIG OUT LTC6993 + V + GND 0.1µF R MOD SET DIV R R2 SET 69931234 F08 Figure 8. Voltage-Controlled Pulse Width CTRL OUT ...

  • Page 18

    ... MASTER An example is shown in Figure 10, using the circuit in Figure 8. V CTRL 2V/DIV TRIG 5V/DIV OUT 5V/DIV PULSE WIDTH 2µs/DIV LTC6993-1 20µs/DIV + V = 3.3V DIVCODE = 200k SET R = 464k MOD t = 3µs AND 6µs OUT Figure 10 ...

  • Page 19

    ... DIV R2 SET R SET DCB PACKAGE LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 C1 connection to the ground plane are recommended to minimize the inductance. Capacitor C1 should be a 0.1µF ceramic capacitor. 2. Place all passive components on the top side of the board. This minimizes trace inductance. 3. Place R SET make a direct, short connection. The SET pin is a cur- rent summing node and currents injected into this pin directly modulate the output pulse width ...

  • Page 20

    ... INPUT 64µs 69931234 TA02b 50µs/DIV = 64µs. OUT 1.5ms REFERENCE PULSE TRIG OUT 1.5ms PULSE LTC6993 GND 0.01µF 1M SET DIV R8 R2 143k 280k 69931234 TA03 1.5ms CAL TRIM 10µs GENERATOR OUT OUT LTC6993 0.1µF 976k DIV R2 102k 69931234p ...

  • Page 21

    ... STAIRCASE RESET STAIRCASE RESET PULSE GENERATOR TRIG OUT STAIRCASE OUT LTC6993-2 5V PULSES IN + GND 0.1µF 280k SET DIV R3 R2 147k 1M LTC6993-1/LTC6993-2 LTC6993-3/LTC6993-4 RETRIGGER LOCKOUT TIME STAIRCASE OUT V OUT RESET RESET MEASURE RESETS AFTER 1.5ms IF NO PULSES APPLIED 69931234 TA06 69931234p  ...

  • Page 22

    ... Q2 – 2N2907 U4 LT1638 RAMP + C1 Q3 2200pF 2N2219A R7 10k RAMP VOLTAGE PROPORTIONAL TO INPUT PULSE WIDTH TRIG OUT 500µs RAMP RESET TIMER LTC6993 GND 0.1µF 182k SET DIV R3 R5 392k 976k 69931234 TA07 24V TIMED (5s) TURN-OFF AFTER LOSS OF INPUT PULSES ...

  • Page 23

    ... TOP MARK OUTLINE (SEE NOTE 6) 0.25 0.05 0.200 REF 0.75 0.05 S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 1.22 REF 1.50 – 1.75 2.80 BSC 1.4 MIN (NOTE 4) 0.95 BSC 0.80 – 0.90 1.00 MAX 0.09 – 0.20 (NOTE 3) LTC6993-1/LTC6993-2 LTC6993-3/LTC6993 0.115 0.40 0.10 TYP TYP 3.00 0.10 1.65 0.10 (2 SIDES) (2 SIDES) PIN 1 NOTCH R0.20 OR 0.25 45 CHAMFER 3 (DCB6) DFN 0405 1 ...

  • Page 24

    ... TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM) LTC6994 TimerBlox: Delay Block/Debouncer  Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Consecutive Test Sequencer TEST 1 TRIG OUT TRIG OUT LTC6993-1 LTC6993-3 0.1µ GND V GND R2 0.1µF SET DIV SET ...