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參數(shù)資料
| 型號： | LTC6909HMS#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 7/22頁 |
| 文件大小： | 0K |
| 描述： | IC OSC SILICON 6.67MHZ 16-MSOP |
| 標準包裝： | 37 |
| 類型： | 振蕩器 - 硅 |
| 頻率： | 12.5kHz ~ 6.67MHz |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 電流 - 電源： | 2.4mA |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 16-TFSOP（0.118"，3.00mm 寬） |
| 包裝： | 管件 |
| 供應商設備封裝： | 16-MSOP |
| 安裝類型： | 表面貼裝 |
LTC6909
15
6909fa
Figure 7. Start-Up Time
Figure 6. Supply Bypassing and PCB Layout
9. The connections for PH0, PH1 and PH2 are not shown
in Figure 6. These pins are connected to either GND or
V+D depending on the output phasing required for the
application. Connection to ground is done underneath
thepart.ConnectingPH2toV+Disalsostraightforward.
Connecting PH0 or PH1 to V+D may require one or
both traces to go down a layer. If you are dynamically
changing one or all of the PH pins, place a 10k resis-
tor in series with the signal line. Locate the resistor
fairly close to the PH pin. This signal typically comes
from a microcontroller or the power good signal from
a switching regulator and is usually quite noisy. The
series resistor provides some isolation between the
noisy signal and the LTC6909.
START-UP ISSUES AND CONSIDERATIONS
The start-up time and settling time to within 1% of the
final value is estimated by the following equation:
tSTART ≈RSET
25s
1k
+10s
For instance, with RSET = 100k, the LTC6909 will settle to
within 1% of its 1MHz final value in approximately 260s.
Figure7showsthestart-uptimeforvariousRSETresistors.
To assist in an orderly start-up sequence, the LTC6909’s
outputs are in a high impedance state for the first 128
master clock cycles after power-up. This ensures that
the first clock cycle is very close to the desired operating
frequency.
Powering up and down complex multiphase switching
regulator circuits is always chaotic and can have serious
system consequences if it is not done carefully. In addition
totheLTC6909’smutingoftheoutputstoensurefirstcycle
accuracy, the PH0-PH1-PH2 codes 000 (all outputs are
ApplicAtions inForMAtion
6909 F06
C1
0.1F
C2
0.1F
DIRECT, LOW IMPEDANCE
CONNECTION TO THE V+
SUPPLY
V+A
LTC6909
GND
GROUND
PLANE
GROUND
PLANE
PH0
PH1
OUT1
SET
PH2
MOD
V+D
OUT8
RSET
V+A
GND
C1
RSET
C2
PH0
PH1
OUT1
OUT2
OUT3
OUT4
SET
PH2
MOD
V+D
OUT8
OUT7
OUT6
OUT5
RSET (Ω)
100
ST
AR
T-UP
DELA
Y(s)
1000
1k
100k
1M
10M
6909 F07
10
10k
10000
TA = 25°C
V+ = 3V
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6909HMS-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| LTC6909IMS#PBF | 功能描述:IC OSC SILICON 6.67MHZ 16-MSOP 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:- 標準包裝:3,000 系列:- 類型:振蕩器 - 晶體 計數(shù):- 頻率:- 電源電壓:2.3 V ~ 5.5 V 電流 - 電源:1.07mA 工作溫度:-30°C ~ 80°C 封裝/外殼:SOT-665 包裝:帶卷 (TR) 供應商設備封裝:SS迷你型-5D 安裝類型:表面貼裝 其它名稱:AN8955SSMTXLTR |
| LTC6909IMS#TRPBF | 功能描述:IC OSC SILICON 6.67MHZ 16-MSOP 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:- 產品培訓模塊: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 |
| LTC6909IMS-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| LTC6909IMS-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
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