参数资料
| 型号： | LTC6991IDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/24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： | 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
17
6991fb
The oscillator can still function with reduced accuracy for
ISET<1.25μA.Atapproximately500nA,theoscillatoroutput
will be frozen in its current state. The output could halt in
a high or low state. This avoids introducing short pulses
when frequency modulating a very low frequency output.
At the other extreme, it is not recommended to operate
the master oscillator beyond 2MHz because the accuracy
of the DIV pin ADC will suffer.
Frequency Modulation and Settling Time
The LTC6991 will respond to changes in ISET up to a –3dB
bandwidth of 0.4 fOUT.
Following a 2× or 0.5× step change in ISET, the output
frequency takes less than one cycle to settle to within 1%
of the final value.
Power Supply Current
The power supply current varies with frequency, supply
voltage and output loading. It can be estimated under
any condition using the following equation. This equation
APPLICATIONS INFORMATION
–
+
6991 F15
LTC6991
RST
GND
SET
OUT
V+
DIV
C1
0.1μF
R1
R2
RSET
V+
RVCO
V+
0.1μF
1/2
LTC6078
LTC1659
V+
VCC
REF
GND
VOUT
μP
DIN
CLK
CS/LD
1MHz 50kΩ
1024 NDIV RVCO
fOUT =
DIN = 0 TO 4095
1 +
–
RVCO
RSET
DIN
4096
0.1μF
Figure 15. Digitally-Controlled Oscillator
ignores CLOAD (valid for CLOAD < 1nF) and assumes the
output has 50% duty cycle.
IS(TYP) ≈ V+ fMASTER 7.8pF +
V+
420k
Ω
+
V+
2 RLOAD
+ 1.8 ISET +50μA
Supply Bypassing and PCB Layout Guidelines
The LTC6991 is a 2.2% accurate silicon oscillator when
used in the appropriate manner. The part is simple to use
and by following a few rules, the expected performance
is easily achieved. Adequate supply bypassing and proper
PCB layout are important to ensure this.
Figure 18 shows example PCB layouts for both the TSOT-23
and DFN packages using 0603 sized passive components.
The layouts assume a two layer board with a ground plane
layer beneath and around the LTC6991. These layouts are
a guide and need not be followed exactly.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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