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LTC6905HS5#PBF PDF预览

LTC6905HS5#PBF

更新时间: 2024-01-23 04:31:01
品牌 Logo 应用领域
凌特 - Linear 振荡器
页数 文件大小 规格书
8页 120K
描述
LTC6905 - 17MHz to 170MHz Resistor Set SOT-23 Oscillator; Package: SOT; Pins: 5; Temperature Range: -40°C to 125°C

LTC6905HS5#PBF 技术参数

是否Rohs认证: 符合生命周期:Transferred
零件包装代码:SOT包装说明:VSSOP, TSOP5/6,.11,37
针数:5Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.4模拟集成电路 - 其他类型:PLL FREQUENCY SYNTHESIZER
JESD-30 代码:R-PDSO-G5JESD-609代码:e3
长度:2.9 mm湿度敏感等级:1
功能数量:1端子数量:5
最高工作温度:125 °C最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY封装代码:VSSOP
封装等效代码:TSOP5/6,.11,37封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH峰值回流温度(摄氏度):260
电源:3/5 V认证状态:Not Qualified
座面最大高度:1 mm子类别:Other Analog ICs
最大供电电流 (Isup):20 mA最大供电电压 (Vsup):5.5 V
最小供电电压 (Vsup):2.7 V标称供电电压 (Vsup):3 V
表面贴装:YES技术:CMOS
温度等级:AUTOMOTIVE端子面层:Matte Tin (Sn)
端子形式:GULL WING端子节距:0.95 mm
端子位置:DUAL处于峰值回流温度下的最长时间:30
宽度:1.625 mmBase Number Matches:1

LTC6905HS5#PBF 数据手册

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LTC6905  
W
BLOCK DIAGRA  
f
V
= 1V ±5%  
MO  
N
RES  
f
=
+
+
OSC  
PROGRAMMABLE  
DIVIDER  
(÷1, 2 OR 4)  
(V – V  
SET  
)
V
OUT  
1
5
+
R
SET  
GAIN = 1  
MASTER OSCILLATOR  
I
RES  
+
SET  
DIVIDER  
SELECT  
V
3
2
15µA  
+
DIV  
THREE-STATE  
INPUT DETECT  
4
+
V
BIAS  
I
RES  
15µA  
GND  
GND  
6905 BD  
U
THEORY OF OPERATIO  
As shown in the Block Diagram, the LTC6905’s master  
oscillator is controlled by the ratio of the voltage between  
the V+ and SET pins and the current entering the SET pin  
(IRES). The voltage on the SET pin is forced to approxi-  
mately 1V below V+ by the PMOS transistor and its gate  
bias voltage.  
master output frequency passed directly to OUT. The DIV  
pin may be floated or driven to midsupply to select ÷2, the  
intermediatefrequencyrange.Thelowestfrequencyrange,  
÷4, is selected by tying DIV to GND or driving it below  
0.5V. Figure 1 shows the relationship between RSET  
,
divider setting and output frequency, including the over-  
lapping frequencies.  
A resistor RSET, connected between the V+ and SET pins,  
“locks together” the voltage (V+ – VSET) and current, IRES  
,
30  
variation.ThisprovidestheLTC6905’shighprecision.The  
master oscillation frequency reduces to:  
25  
÷4 ÷2  
÷1  
168.5MHz •10kΩ  
20  
15  
10  
5
fMO  
=
+ 1.5MHz  
RSET  
To extend the output frequency range, the master oscilla-  
tor signal is divided by 1, 2 or 4 before driving OUT (Pin  
5). The LTC6905 is optimized for use with resistors  
between 10k and 25k, corresponding to oscillator fre-  
quencies between 17.225MHz and 170MHz. The divide-  
by value is determined by the state of the DIV input  
(Pin 4). Tie DIV to V+ or drive it to within 0.4V of V+ to  
select ÷1. This is the highest frequency range, with the  
110  
160  
10  
60  
OUTPUT FREQUENCY (MHz)  
6905 F01  
Figure 1. RSET vs Output Frequency  
6905fa  
5

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