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參數(shù)資料
| 型號： | LTC6907IS6#TRMPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC SILICON 4MHZ TSOT23-6 |
| 標準包裝： | 500 |
| 類型： | 振蕩器 - 硅 |
| 頻率： | 40kHz ~ 4MHz |
| 電源電壓： | 3 V ~ 3.6 V |
| 電流 - 電源： | 305µA |
| 工作溫度： | -40°C ~ 85°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 |
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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