- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9515 > LTC6991CS6#TRMPBF (Linear Technology)IC OSC SILICON 977HZ TSOT23-6 PDF資料下載
參數(shù)資料
| 型號： | LTC6991CS6#TRMPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC SILICON 977HZ TSOT23-6 |
| 產(chǎn)品培訓模塊： | TimerBlox Family Timing Devices |
| 產(chǎn)品目錄繪圖： | LTC699_TSOT-23 |
| 特色產(chǎn)品： | LTC?6991 Silicon Oscillator TimerBlox? |
| 標準包裝： | 1 |
| 系列： | TimerBlox® |
| 類型： | 振蕩器 - 硅 |
| 頻率： | 29.1µHz ~ 977Hz |
| 電源電壓： | 2.25 V ~ 5.5 V |
| 電流 - 電源： | 135µA |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | SOT-23-6 細型，TSOT-23-6 |
| 包裝： | 標準包裝 |
| 供應商設備封裝： | TSOT-23-6 |
| 安裝類型： | 表面貼裝 |
| 配用： | DC1562A-B-ND - BOARD EVAL LTC6991 |
| 其它名稱： | LTC6991CS6#TRMPBFDKR |
LTC6991
14
6991fb
APPLICATIONS INFORMATION
Basic Operation
The simplest and most accurate method to program the
LTC6991 is to use a single resistor, RSET, between the SET
and GND pins. The design procedure is a 3-step process.
First select the POL bit setting and NDIVvalue,thencalculate
the value for the RSET resistor.
Alternatively, Linear Technology offers the easy to use
TimerBlox Designer tool to quickly design any LTC6991
based circuit. Download the free TimerBlox Designer
software at www.linear.com/timerblox.
Step 1: Select the POL Bit Setting
The LTC6991 can operate in normal (active-high) or inverted
(active-low) modes, depending on the setting of the POL
bit. The best choice depends on the the application.
Step 2: Select the NDIV Frequency Divider Value
As explained earlier, the voltage on the DIV pin sets the
DIVCODE which determines both the POL bit and the NDIV
value. For a given output clock period, NDIV should be
selected to be within the following range.
tOUT
16.384ms
≤ NDIV ≤
tOUT
1.024ms
(1)
To minimize supply current, choose the lowest NDIV value
(generally recommended). Alternatively, use Table 1
as a guide to select the best NDIV value for the given
application.
With POL already chosen, this completes the selection of
DIVCODE. Use Table 1 to select the proper resistor divider
or VDIV/V+ ratio to apply to the DIV pin.
Step 3: Calculate and Select RSET
The final step is to calculate the correct value for RSET
using the following equation.
RSET =
50k
1.024ms
tOUT
NDIV
(2)
Select the standard resistor value closest to the calculated
value.
Example: Design a 1Hz oscillator with minimum power
consumption and active-high reset input.
Step 1: Select the POL Bit Setting
For noninverted (active-high) functionality, choose
POL = 0.
Step 2: Select the NDIV Frequency Divider Value
Choose an NDIV value that meets the requirements of
Equation (1), using tOUT = 1000ms:
61.04 ≤ NDIV ≤ 976.6
Potential settings for NDIV include 64 and 512. NDIV = 64
is the best choice, as it minimizes supply current by us-
ing a large RSET resistor. POL = 0 and NDIV = 64 requires
DIVCODE = 2. Using Table 1, choose R1 = 976k and
R2 = 182k values to program DIVCODE = 2.
Step 3: Select RSET
Calculate the correct value for RSET using Equation (2).
RSET =
50k
1.024ms
1000ms
64
= 763k
Since 763k is not available as a standard 1% resistor,
substitute 768k if a –0.7% frequency shift is acceptable.
Otherwise, select a parallel or series pair of resistors such
as 576k + 187k to attain a more precise resistance.
The completed design is shown in Figure 11.
DIVCODE = 2
6991 F11
LTC6991
RST
GND
SET
RST
OUT
V+
DIV
R1
976k
R2
182k
RSET
763k
2.25V TO 5.5V
Figure 11. 1Hz Oscillator
相關PDF資料 |
PDF描述 |
|---|---|
| V28A48M200BG | CONVERTER MOD DC/DC 48V 200W |
| MS27497E18A32SA | CONN RCPT 32POS WALL MNT W/SCKT |
| MS27484T16F55PA | CONN PLUG 55POS STRAIGHT W/PINS |
| MS27508E18F35SB | CONN RCPT 66POS BOX MNT W/SCKT |
| V28A48M200BF3 | CONVERTER MOD DC/DC 48V 200W |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6991HDCB#TRMPBF | 功能描述:IC OSC SILICON 977HZ 6-DFN RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:TimerBlox® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應商設備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LTC6991HDCB#TRPBF | 功能描述:IC OSC SILICON 977HZ 6-DFN RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:TimerBlox® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應商設備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LTC6991HDCBPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:TimerBlox: Resettable, Low Frequency Oscillator |
| LTC6991HS6#PBF | 制造商:Linear Technology 功能描述:TIMER BLOX RESETTABLE, LOW FREQUENCY OSCILLATOR |
| LTC6991HS6#TRMPBF | 功能描述:IC OSC SILICON 977HZ TSOT23-6 RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:TimerBlox® 標準包裝:3,000 系列:- 類型:振蕩器 - 晶體 計數(shù):- 頻率:- 電源電壓:2.3 V ~ 5.5 V 電流 - 電源:1.07mA 工作溫度:-30°C ~ 80°C 封裝/外殼:SOT-665 包裝:帶卷 (TR) 供應商設備封裝:SS迷你型-5D 安裝類型:表面貼裝 其它名稱:AN8955SSMTXLTR |
發(fā)布緊急采購，3分鐘左右您將得到回復。