参数资料
| 型号： | LTC6907IS6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC OSC SILICON 4MHZ TSOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 振荡器 - 硅 |
| 频率： | 40kHz ~ 4MHz |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 305µA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
| 安装类型： | 表面贴装 |
LTC6907
7
6907fa
THEORY OF OPERATIO
U
The LTC6907 is a precision, resistor programmable oscil-
lator (see Block Diagram). It generates a square wave at
the OUT pin with a period directly proportional to the value
of an external resistor, RSET. A feedback circuit measures
and controls the oscillator frequency to achieve the high-
est possible accuracy. In equilibrum, this circuit ensures
that the current in the SET pin, ISET, is balanced by IFB. IFB
is proportional to the master oscillator frequency, so we
have the relationship:
ISET = IFB = VSET OSC COSC
(1)
Where COSC is a precision internal capacitor:
COSC = 5pF for the LTC6907
Solving for the oscillator period:
t
V
I
C
OSC
SET
OSC
==
1
(2)
This is the fundamental equation for the LTC6907. It holds
regardless of how the SET pin is driven. When a resistor,
RSET, is connected from the SET pin to ground, we have
the relationship:
V
I
R
SET
=
(3)
so
tR
C
OSC
SET
OSC
==
1
(4)
The period and frequency are determined exclusively by
RSET and the precision internal capacitor. Importantly, the
value of VSET is immaterial, and the LTC6907 maintains its
accuracy even though VSET is not a precision reference
voltage.
The digital dividers shown in the Block Diagram further
divide the master oscillator frequency by 1, 3 or 10
producing:
OUT
OSC
N
=
(5)
and
tOUT = N tOSC
(6)
Table 1 gives specific frequency and period equations for
the LTC6907. The Applications Information section gives
further detail and discusses alternative ways of setting the
LTC6907 output frequency.
Table 1. Output Frequency Equations
PART NUMBER
FREQUENCY
PERIOD
DIVIDER RATIOS
LTC6907
OUT
SET
MHz
N
k
R
=
4
50
tN
ns
R
k
OUT
SET
=
250
50
N
Open
=
=
+
10
3
1
,
DIV Pin
V
DIV Pin
GND
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| LTC6908CDCB-1#TRMPBF | 功能描述:IC OSC SILICON 10MHZ 6-DFN 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:- 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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