substitute 619k if a –0." />
參數(shù)資料
型號： DC1562A-J
廠商： Linear Technology
文件頁數(shù)： 9/26頁
文件大?。?/td> 0K
描述： BOARD EVAL LTC6993-4
設(shè)計(jì)資源： DC1562A Design Files
DC1562A Schematic
特色產(chǎn)品： TimerBlox?
標(biāo)準(zhǔn)包裝： 1
系列： TimerBlox®
主要目的： 定時(shí)，單穩(wěn)多諧振蕩器
嵌入式： 否
已用 IC / 零件： LTC6993-4
主要屬性： 下降沿觸發(fā)器，可再觸發(fā)
次要屬性： 2.25 V ~ 5.5 V 電源
已供物品： 板
LTC6993-1/LTC6993-2
LTC6993-3/LTC6993-4
17
69931234fb
Since 625k is not available as a standard 1% resistor,
substitute 619k if a –0.97% shift in tOUT is acceptable.
Otherwise, select a parallel or series pair of resistors such
as 309k and 316k to attain a more precise resistance.
The completed design is shown in Figure 7.
APPLICATIONS INFORMATION
Figure 7. 100s Negative Pulse Generator
LTC6993-2
TRIG
GND
SET
OUT
V+
DIV
R1
102k
DIVCODE = 14
69931234 F07
2.25V TO 5.5V
R2
976k
0.1F
RSET
625k
Figure 8. Voltage-Controlled Pulse Width
LTC6993
TRIG
GND
SET
OUT
V+
DIV
R1
C1
0.1F
69931234 F08
V+
R2
RSET
RMOD
VCTRL
69931234 F09
LTC6993
TRIG
GND
SET
OUT
V+
DIV
C1
0.1F
R1
R2
V+
RMOD
RSET
–
+
V+
0.1F
1/2
LTC6078
LTC1659
V+
VCC
REF
GND
VOUT
P
DIN
CLK
CS/LD
NDIV RMOD
50k
tOUT =
DIN = 0 TO 4095
–
1+
RMOD
RSET
DIN
4096
1s
0.1F
Voltage-Controlled Pulse Width
With one additional resistor, the LTC6993 output pulse
widthcanbemanipulatedbyanexternalvoltage.Asshown
in Figure 8, voltage VCTRL sources/sinks a current through
RMOD to vary the ISET current, which in turn modulates
the pulse width as described in Equation (3).
tOUT =
NDIV RMOD
50k
1s
1
+
RMOD
RSET
–
VCTRL
VSET
(3)
Digital Pulse Width Control
The control voltage can be generated by a DAC (digital-to-
analog converter), resulting in a digitally-controlled pulse
width. Many DACs allow for the use of an external refer-
ence. If such a DAC is used to provide the VCTRL voltage,
the VSET dependency can be eliminated by buffering VSET
and using it as the DAC’s reference voltage, as shown in
Figure 9. The DAC’s output voltage now tracks any VSET
variation and eliminates it as an error source. The SET pin
cannot be tied directly to the reference input of the DAC
because the current drawn by the DAC’s REF input would
affect the pulse width.
Figure 9. Digitally Controlled Pulse Width
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DC1562A-K 功能描述:BOARD EVAL LTC6994-1 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:TimerBlox® 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081
DC1562A-L 功能描述:BOARD EVAL LTC6994-2 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:TimerBlox® 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081
DC1562B-B 制造商:Linear Technology 功能描述:LTC6991 DEMO BOARD 1Hz (1s) Fixed Frequenc
DC1562B-C 制造商:Linear Technology 功能描述:LTC6992-1 DEMO BOARD 10kHz, 0 100% Duty Cycle
DC1562B-E 制造商:Linear Technology 功能描述:BOARD EVAL LTC6992-3 制造商:Linear Technology 功能描述:DEMO BOARD LTC6992-3 VOLTAGE CONTROLLED 制造商:Linear Technology 功能描述:DEMO BOARD, LTC6992-3 VOLTAGE CONTROLLED 制造商:Linear Technology 功能描述:DEMO BOARD, LTC6992-3 VOLTAGE CONTROLLED OSC, Silicon Manufacturer:Linear Technology, Silicon Core Number:LTC6992-3, Kit Application Type:Clock & Timing, Application Sub Type:Voltage Controlled Oscillator
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