参数资料
| 型号： | LTC6990HDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/30页 |
| 文件大小： | 0K |
| 描述： | IC OSC SILICON 1MHZ 6DFN |
| 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： | 488Hz ~ 1MHz |
| 电源电压： | 2.25 V ~ 5.5 V |
| 电流 - 电源： | 235µA |
| 工作温度： | -40°C ~ 125°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-A-ND - BOARD EVAL LTC6990 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页当前第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
LTC6990
18
6990fc
For more information www.linear.com/LTC6990
APPLICATIONS INFORMATION
Step 2: Calculate KVCO and f(0V)
Next,calculatetheintermediatevaluesKVCOandf(0V)using
Equations (3b) and (3c).
KVCO =
100kHz
10kHz
4V
1V
= 30kHz/V
f(0V) =100kHz + 30kHz/V 1V =130kHz
Step 3: Calculate and Select RVCO
The next step is to use Equation (3d) to calculate the cor-
rect value for RVCO.
RVCO =
1MHz 50k
8 1V 30kHz/V
= 208.333k
Select RVCO = 210k.
Step 4: Calculate and Select RSET
The final step is to calculate the correct value for RSET
using Equation (3e).
RSET =
1MHz 50k
8 130kHz
1V 30kHz/V
(
)
= 62.5k
Select RSET = 61.9k
In this design example, with its wide 10:1 frequency
range, the potential output frequency error due to VSET
error alone ranges from less than ±1% when VCTRL is at
its minimum up to ±36% when VCTRL is at its maximum.
This error must be accounted for in the system design.
Depending on the application’s requirements, the non-
inverting VCO circuit in Figure 13 may be preferred for
this wide of a frequency variation as its maximum inac-
curacy due to VSET error is only ±9% and can be reduced
to only ±3% with a small change to the voltage tuning
range specification.
Reducing VSET Error Effects in VCO Applications
Figure 13 shows a VCO that reduces the effect of VSET
by adding an op-amp to make VCTRL dependent on VSET.
This circuit also has a positive transfer function (the out-
put frequency increases as VIN increases). Furthermore,
for positive VIN voltages, this circuit places the greatest
absolute frequency error at the highest output frequency.
Compared to the simple VCO circuit of Figure 11, the
absolute frequency error is unchanged. However, with
the maximum absolute frequency error (in Hertz) now
occurring at the highest output frequency, the relative
frequency error (in percent) is greatly improved.
Figure 13. VCO with Reduced VSET Sensitivity
6990 F13
LTC6990
OE
GND
SET
OUT
V+
DIV
C1
0.1F
R1
1M
R2
280k
DIVCODE = 3
(NDIV = 8, Hi-Z = 0)
RSET
249k
3V
RVCO
75k
–
+
3V
10kHz TO 100kHz
fOUT
VCTRL
VSET
1/2
LTC6078
R4
30.1k
C4
33pF
R3
100k
0.4V TO 4V
VIN
fOUT =
1MHz 50k
NDIV RVCO
RVCO
RSET
+
VIN
VSET
1
R4
R3
IF
R4
R3
=
RVCO
RSET
, THE EQUATION REDUCES TO:
fOUT =
1MHz 50k
NDIV RSET
VIN
VSET
= VIN 25kHz/V
相关PDF资料 |
PDF描述 |
|---|---|
| V375B15M300BF | CONVERTER MOD DC/DC 15V 300W |
| LTC6992HDCB-4#TRMPBF | IC OSC SILICON 1MHZ 6-DFN |
| LTC6992HDCB-3#TRMPBF | IC OSC SILICON 1MHZ 6-DFN |
| V375B15M300B3 | CONVERTER MOD DC/DC 15V 300W |
| LTC6992HDCB-2#TRMPBF | IC OSC SILICON 1MHZ 6-DFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6990HS6#TRMPBF | 功能描述:IC OSC SILICON 1MHZ 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 |
| LTC6990HS6#TRPBF | 功能描述:IC OSC SILICON 1MHZ 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 |
| LTC6990HS6PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:TimerBlox: Voltage Controlled Silicon Oscillator |
| LTC6990HS6-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:TimerBlox: Voltage Controlled Silicon Oscillator |
| LTC6990HS6TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:TimerBlox: Voltage Controlled Silicon Oscillator |
发布紧急采购，3分钟左右您将得到回复。