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| 型號： | DC1562A-B |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL LTC6991 |
| 設(shè)計資源： | DC1562A Design Files DC1562A Schematic |
| 特色產(chǎn)品： | TimerBlox? |
| 標準包裝： | 1 |
| 系列： | TimerBlox® |
| 主要目的： | 計時，時鐘振蕩器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LTC6991 |
| 主要屬性： | 1Hz 固定頻率 |
| 次要屬性： | 2.25 V ~ 5.5 V 電源 |
| 已供物品： | 板 |
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LTC6991
16
6991fb
Self-Resetting Circuits
The RST pin has hysteresis to accommodate slow-changing
input voltages. Furthermore, the trip points are proportional
to the supply voltage (see Note 6 and the RST Threshold
Voltage vs Supply Voltage curve in Typical Performance
Characteristics). This allows an RC time constant at the
RST input to generate a delay that is nearly independent
of the supply voltage.
A simple application of this technique allows the LTC6991
output to reset itself, producing a well-controlled pulse
once each cycle. Figures 13a and 13b show circuits that
produce approximately 1μs pulses once a minute. The
only difference is in the POL bit setting, which controls
whether the pulse is positive or negative.
Voltage Controlled Frequency
With one additional resistor, the LTC6991 output frequency
can be manipulated by an external voltage. As shown in
Figure 14, voltage VCTRL sources/sinks a current through
RVCO to vary the ISET current, which in turn modulates the
output frequency as described in Equation (3).
f
MHz
k
NR
R
V
OUT
DIV
VCO
SET
CTRL
S
=+
150
1024
1
Ω
E
ET
(3)
Digital Frequency Control
The control voltage can be generated by a DAC (digital-
to-analog converter), resulting in a digitally-controlled
frequency. Many DACs allow for the use of an external
reference. If such a DAC is used to provide the VCTRL
voltage, the VSET dependency can be eliminated by buffer-
ing VSET and using it as the DAC’s reference voltage, as
shown in Figure 15. 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 frequency.
ISET Extremes (Master Oscillator Frequency Extremes)
When operating with ISET outside of the recommended
1.25μA to 20μA range, the master oscillator operates
outside of the 62.5kHz to 1MHz range in which it is most
accurate.
APPLICATIONS INFORMATION
LTC6991
2.25V TO 5.5V
0.1μF
OUT
R1
1M
R2
392k
RSET
715k
RST
GND
SET
OUT
V+
DIV
CPW
470pF
RPW
2.26k
6991 F13a
60 SECONDS
1μs PULSE WIDTH
VRST(RISING)
V+
tPULSE = –RPW CPW In
tPULSE ≈ –2.26kΩ 470pF In(1 – 0.61)
tPULSE ≈ 1μs
1–
LTC6991
2.25V TO 5.5V
0.1μF
6991 F13b
OUT
R1
392k
R2
1M
60 SECONDS
0.9μs PULSE WIDTH
VRST(FALLING)
V+
tPULSE = –RPW CPW In
tPULSE ≈ –2.26kΩ 470pF In(0.43)
tPULSE ≈ 0.9μs
RSET
715k
RST
GND
SET
OUT
V+
DIV
CPW
470pF
RPW
2.26k
6991 F14
LTC6991
RST
GND
SET
OUT
V+
DIV
R1
C1
0.1μF
R2
RSET
RVCO
VCTRL
V+
Figure 13a. Self-Resetting Circuit (DIVCODE = 4)
Figure 13b. Self-Resetting Circuit (DIVCODE = 11)
Figure 14. Voltage-Controlled Oscillator
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參數(shù)描述 |
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| DC1562A-C | 功能描述:BOARD EVAL LTC6992-1 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:TimerBlox® 標準包裝:1 系列:- 主要目的:數(shù)字電位器 嵌入式:- 已用 IC / 零件:AD5258 主要屬性:- 次要屬性:- 已供物品:板 相關(guān)產(chǎn)品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| DC1562A-D | 功能描述:BOARD EVAL LTC6992-2 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:TimerBlox® 標準包裝:1 系列:- 主要目的:數(shù)字電位器 嵌入式:- 已用 IC / 零件:AD5258 主要屬性:- 次要屬性:- 已供物品:板 相關(guān)產(chǎn)品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| DC1562A-E | 功能描述:BOARD EVAL LTC6992-3 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:TimerBlox® 標準包裝:1 系列:- 主要目的:數(shù)字電位器 嵌入式:- 已用 IC / 零件:AD5258 主要屬性:- 次要屬性:- 已供物品:板 相關(guān)產(chǎn)品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| DC1562A-F | 功能描述:BOARD EVAL LTC6992-4 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:TimerBlox® 標準包裝: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-G | 功能描述:BOARD EVAL LTC6993-1 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:TimerBlox® 標準包裝:1 系列:- 主要目的:數(shù)字電位器 嵌入式:- 已用 IC / 零件:AD5258 主要屬性:- 次要屬性:- 已供物品:板 相關(guān)產(chǎn)品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
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