参数资料
| 型号： | LTC6906IS6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC OSC SILICON 1MHZ TSOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 振荡器 - 硅 |
| 频率： | 10kHz ~ 1MHz |
| 电源电压： | 2.25 V ~ 3.6 V |
| 电流 - 电源： | 78µA |
| 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 |
LTC6906
7
6906fc
The LTC6906 is a precision, resistor programmable oscilla-
tor (see the 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 equilibrium, 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 = 10pF for the LTC6906
Solving for the oscillator period:
tOSC =
1
OSC
=
VSET
ISET
COSC
(2)
This is the fundamental equation for the LTC6906. 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:
VSET
ISET
= R
SET
(3)
so
tOSC =
1
OSC
= R
SET COSC
(4)
THEORY OF OPERATION
The period and frequency are determined exclusively by
RSET and the precision internal capacitor. Importantly, the
value of VSET is immaterial, and the LTC6906 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 pro-
ducing:
OUT =
OSC
N
(5)
and
tOUT = N tOSC
(6)
Table 1 gives specific frequency and period equations for
the LTC6906. The Applications Information section gives
further detail and discusses alternative ways of setting the
LTC6906 output frequency.
Table 1. Output Frequency Equations
PART NUMBER
FREQUENCY
PERIOD
DIVIDER RATIOS
LTC6906
OUT =
1MHz
N
100k
RSET
tOUT = N 1μs
RSET
100k
N
=
10,
3,
1,
DIV Pin
= V +
DIV Pin
= Open
DIV Pin
= GND
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