參數(shù)資料
型號: DC1562A-D
廠商: Linear Technology
文件頁數(shù): 6/34頁
文件大?。?/td> 0K
描述: BOARD EVAL LTC6992-2
設計資源: DC1562A Design Files
DC1562A Schematic
特色產品: TimerBlox?
標準包裝: 1
系列: TimerBlox®
主要目的: 計時,時鐘振蕩器
嵌入式:
已用 IC / 零件: LTC6992-2
主要屬性: 10KHz PWM,5 - 95% 占空比
次要屬性: 2.25 V ~ 5.5 V 電源
已供物品:
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更多...
LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
14
69921234fc
operaTion
The LTC6992 is built around a master oscillator with a
1MHz maximum frequency. The oscillator is controlled
by the SET pin current (ISET) and voltage (VSET), with a
1MHz 50k conversion factor that is accurate to ±0.8%
under typical conditions.
fMASTER =
1
tMASTER
= 1MHz 50k
ISET
VSET
A feedback loop maintains VSET at 1V ±30mV, leaving ISET
as the primary means of controlling the output frequency.
The simplest way to generate ISET is to connect a resistor
(RSET) between SET and GND, such that ISET = VSET/RSET.
The master oscillator equation reduces to:
fMASTER =
1
tMASTER
=
1MHz 50k
RSET
From this equation, it is clear that VSET drift will not affect
theoutputfrequencywhenusingasingleprogramresistor
(RSET). Error sources are limited to RSET tolerance and
the inherent frequency accuracy
fOUT of the LTC6992.
RSET may range from 50k to 800k (equivalent to ISET
between 1.25μA and 20μA).
The LTC6992 includes a programmable frequency divider
which can further divide the frequency by 1, 4, 16, 64,
256, 1024, 4096 or 16384 before driving the OUT pin.
The divider ratio NDIV is set by a resistor divider attached
to the DIV pin.
fOUT =
1
tOUT
=
1MHz 50k
NDIV
ISET
VSET
With RSET in place of VSET/ISET the equation reduces to:
fOUT =
1
tOUT
=
1MHz 50k
NDIV RSET
DIVCODE
TheDIVpinconnectstoaninternal,V+referenced4-bitA/D
converter that determines the DIVCODE value. DIVCODE
programs two settings on the LTC6992:
1. DIVCODE determines the output frequency divider set-
ting, NDIV.
2. DIVCODE determines the output polarity, via the POL
bit.
VDIV may be generated by a resistor divider between V+
and GND as shown in Figure 1.
Figure 1. Simple Technique for Setting DIVCODE
6992 F01
LTC6992
V+
DIV
GND
R1
R2
2.25V TO 5.5V
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