For more information www.linear.com/LTC6990 OPERATION The LTC6990 is built around a m" />
參數(shù)資料
型號： LTC6990CS6#TRMPBF
廠商： Linear Technology
文件頁數(shù)： 2/30頁
文件大?。?/td> 0K
描述： IC OSC SILICON 1MHZ TSOT23-6
產(chǎn)品培訓模塊： TimerBlox Family Timing Devices
特色產(chǎn)品： TimerBlox?
標準包裝： 1
系列： TimerBlox®
類型： 振蕩器 - 硅
頻率： 488Hz ~ 1MHz
電源電壓： 2.25 V ~ 5.5 V
電流 - 電源： 235µA
工作溫度： 0°C ~ 70°C
封裝/外殼： SOT-23-6 細型，TSOT-23-6
包裝： 標準包裝
供應商設備封裝： TSOT-23-6
安裝類型： 表面貼裝
配用： DC1562A-A-ND - BOARD EVAL LTC6990
其它名稱： LTC6990CS6#TRMPBFDKR
LTC6990
10
6990fc
For more information www.linear.com/LTC6990
OPERATION
The LTC6990 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
the output frequency when using a single program resis-
tor (RSET). Error sources are limited to RSET tolerance and
the inherent frequency accuracy fOUT of the LTC6990.
RSET values between 50k and 800k (equivalent to ISET
between 1.25A and 20A) produce the best results,
although RSET may be reduced to 25k (ISET = 40A) with
reduced accuracy.
The LTC6990 includes a programmable frequency divider
which can further divide the frequency by 1, 2, 4, 8, 16,
32, 64 or 128 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
The DIV pin connects to an internal, V+ referenced 4-bit
A/D converter that monitors the DIV pin voltage (VDIV) to
determine the DIVCODE value. DIVCODE programs two
settings on the LTC6990:
1. DIVCODE determines the output frequency divider
setting, NDIV.
2. DIVCODE determines the state of the output when
disabled, via the Hi-Z 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
6990 F01
LTC6990
V+
DIV
GND
R1
R2
2.25V TO 5.5V
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相關代理商/技術參數(shù)
參數(shù)描述
LTC6990CS6TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:TimerBlox: Voltage Controlled Silicon Oscillator
LTC6990CS6-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:TimerBlox: Voltage Controlled Silicon Oscillator
LTC6990HDCB#PBF 制造商:Linear Technology 功能描述:SC-Timing, Cut Tape VCO with Confirgurable Gain and Voltage Range
LTC6990HDCB#TRMPBF 功能描述:IC OSC SILICON 1MHZ 6DFN RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:TimerBlox® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應商設備封裝:16-SOIC W 安裝類型:表面貼裝
LTC6990HDCB#TRPBF 功能描述:IC OSC SILICON 1MHZ 6DFN RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:TimerBlox® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應商設備封裝:16-SOIC W 安裝類型:表面貼裝
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