- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9467 > LTC6908IS6-2#TRPBF (Linear Technology)IC OSC SILICON 10MHZ TSOT23-6 PDF資料下載
參數(shù)資料
| 型號： | LTC6908IS6-2#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC SILICON 10MHZ TSOT23-6 |
| 標準包裝： | 2,500 |
| 類型： | 振蕩器 - 硅 |
| 頻率： | 50kHz ~ 10MHz |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 電流 - 電源： | 1.25mA |
| 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 |
LTC6908-1/LTC6908-2
7
690812fa
IRES (A)
V
RES
=
V
+ –
V
SET
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.1
10
100
1000
690812 F01
1
V+ = 5V
V+ = 3V
TA = 25°C
OPERATIO
U
As shown in the Block Diagram, the LTC6908’s master
oscillator is controlled by the ratio of the voltage between
the V+ and SET pins and the current entering the SET pin
(IMASTER). When the spread spectrum frequency modula-
tion (SSFM) is disabled, IMASTER is strictly determined by
the (V+ – VSET) voltage and the RSET resistor. When SSFM is
enabled, IMASTER is modulated by a ltered pseudorandom
noise (PRN) signal. Here the IMASTER current is a random
value uniformly distributed between (ISET – 10%) and (ISET
+ 10%). In this way the frequency of the master oscillator
is modulated to produce an approximately at frequency
spectrum that is centered at the frequency set by the ISET
current, with a bandwidth equal to approximately 20% of
the center frequency.
The voltage on the SET pin is forced to approximately 1.1V
below V+ by the PMOS transistor and its gate bias volt-
age. This voltage is accurate to ±5% at a particular input
current and supply voltage (see Figure 1). The LTC6908
is optimized for use with resistors between 20k and 400k,
corresponding to output frequencies between 250kHz and
5MHz. Accurate frequencies up to 10MHz (RSET = 10k)
are attainable if the supply voltage is greater than 4V. The
RSET resistor, connected between the V
+ and SET pins,
locks together the (V+ – VSET) voltage and the current ISET.
This allows the parts to attain excellent frequency accuracy
regardless of the precision of the SET pin voltage. The
master oscillation frequency is:
fMASTER = 20MHz 10k/RSET
The master oscillator signal is divided by 2 before driving
the output pins, resulting in the simple formula for the
Figure 3. Output Waveforms for LTC6908-1, LTC6908-2
Figure 2. RSET vs Desired Output Frequency
Figure 1. V+ – VSET Variation with IRES
OUT1
OUT2
OUT1
LTC6908-1 (COMPLEMENTARY)
LTC6908-2 (QUADRATURE)
OUT2
690812 F03
output frequency, fOUT, below (see Figure 2):
fOUT = 10MHz 10k/RSET
When the spread spectrum frequency modulation (SSFM)
is disabled, the frequency fOUT is the nal output fre-
quency. When SSFM is enabled, 0.9 fOUT is the minimum
output frequency and 1.1 fOUT is the maximum output
frequency.
Both outputs are nominally 50% duty cycle. There are 2
possible output congurations for the LTC6908, shown
in Figure 3.
Output Congurations
The only difference between the two versions of the
LTC6908 is the phase relationship between the two outputs.
The LTC6908-1 outputs are 180 degrees out of phase and
the LTC6908-2 outputs are 90 degrees out of phase. These
convenient output options are useful in synchronizing the
clocking of multiple phase switching regulator designs. In
very high current applications, a signicant improvement
DESIRED OUTPUT FREQUENCY (Hz)
10k
R
SET
(
)
100k
1M
10M
100k
1M
10M
690812 F02
相關PDF資料 |
PDF描述 |
|---|---|
| LTC6908IS6-1#TRPBF | IC OSC SILICON 10MHZ TSOT23-6 |
| LTC6904CMS8 | IC OSC SILICON 68MHZ 8-MSOP |
| LTC6905IS5#TRMPBF | IC OSC SILICON 170MHZ TSOT23-5 |
| LTC6905IS5#TRPBF | IC OSC SILICON 170MHZ TSOT23-5 |
| MS3450L20-18SZ | CONN RCPT 9POS WALL MNT W/SCKT |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6909 | 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 |
| LTC6909CMS#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 |
| LTC6909CMS#PBF | 制造商:Linear Technology 功能描述:IC MULTIPHASE OSC 6.67MHZ 5.5V MSOP16 制造商:Linear Technology 功能描述:IC, MULTIPHASE OSC, 6.67MHZ, 5.5V MSOP16 |
| LTC6909CMS#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(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 |
| LTC6909CMS-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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。