参数资料
| 型号： | LTC6991IDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | IC OSC SILICON 977HZ 6-DFN |
| 产品培训模块： | TimerBlox Family Timing Devices |
| 特色产品： | TimerBlox? |
| 标准包装： | 2,500 |
| 系列： | TimerBlox® |
| 类型： | 振荡器 - 硅 |
| 频率： | 29.1µHz ~ 977Hz |
| 电源电压： | 2.25 V ~ 5.5 V |
| 电流 - 电源： | 135µA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x3） |
| 安装类型： | 表面贴装 |
| 配用： | DC1562A-B-ND - BOARD EVAL LTC6991 |
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
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| LTC6991IS6#PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:OSCILLATOR 977HZ 5.5V TSOT-23-6 制造商:Linear Technology 功能描述:OSCILLATOR, 977HZ, 5.5V, TSOT-23-6 制造商:Linear Technology 功能描述:SC-Timing, Cut Tape Low Frequency Clock 制造商:Linear Technology 功能描述:OSCILLATOR, 977HZ, 5.5V, TSOT-23-6, Operating Mode:-, Frequency:977Hz, Supply Voltage Min:2.25V, Supply Voltage Max:5.5V, Digital IC Case Style:TSOT-23, No. of Pins:6, Operating Temperature Min:-40C, Operating Temperature Max:85C , RoHS Compliant: Yes |
| LTC6991IS6#TRMPBF | 功能描述:IC OSC SILICON 977HZ TSOT23-6 RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 可编程计时器和振荡器 系列:TimerBlox® 标准包装:3,000 系列:- 类型:振荡器 - 晶体 计数:- 频率:- 电源电压:2.3 V ~ 5.5 V 电流 - 电源:1.07mA 工作温度:-30°C ~ 80°C 封装/外壳:SOT-665 包装:带卷 (TR) 供应商设备封装:SS迷你型-5D 安装类型:表面贴装 其它名称:AN8955SSMTXLTR |
| LTC6991IS6#TRPBF | 功能描述:IC OSC SILICON 977HZ TSOT23-6 RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 可编程计时器和振荡器 系列:TimerBlox® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:45 系列:- 类型:温度 - 补偿晶体振荡器（TCXO） 计数:- 频率:25MHz 电源电压:3.135 V ~ 3.465 V 电流 - 电源:1.5mA 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 包装:管件 供应商设备封装:16-SOIC W 安装类型:表面贴装 |
| LTC6991IS6PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:TimerBlox: Resettable, Low Frequency Oscillator |
| LTC6991MPS6#TRMPBF | 功能描述:IC OSCILLATOR RESET LF TSOT23-6 RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 可编程计时器和振荡器 系列:TimerBlox® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:45 系列:- 类型:温度 - 补偿晶体振荡器（TCXO） 计数:- 频率:25MHz 电源电压:3.135 V ~ 3.465 V 电流 - 电源:1.5mA 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 包装:管件 供应商设备封装:16-SOIC W 安装类型:表面贴装 |
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