參數資料
| 型號： | LTC6906CS6#TRM |
| 廠商： | Linear Technology |
| 文件頁數： | 12/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC SILICON 1MHZ TSOT23-6 |
| 標準包裝： | 500 |
| 類型： | 振蕩器 - 硅 |
| 頻率： | 10kHz ~ 1MHz |
| 電源電壓： | 2.25 V ~ 3.6 V |
| 電流 - 電源： | 78µA |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | SOT-23-6 細型，TSOT-23-6 |
| 包裝： | 帶卷 (TR) |
| 供應商設備封裝： | TSOT-23-6 |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | LTC6906CS5 LTC6906CS5-ND LTC6906CS6 LTC6906CS6-ND |
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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