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參數(shù)資料
| 型號(hào)： | LTC6903IMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | XO, clock |
| 英文描述： | 1kHz - 68MHz Serial Port Programmable Oscillator |
| 中文描述： | CRYSTAL OSCILLATOR, CLOCK, 0.001039 MHz - 68 MHz, CMOS OUTPUT |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 195K |
| 代理商： | LTC6903IMS8 |
LTC6903/LTC6904
6
69034fa
APPLICATIU
Frequency Setting Information
The frequency output of the LTC6903/LTC6904 is deter-
mined by the following equation:
W
U
U
f
Hz
(
DAC
1024
OCT
2
=
2078
2
)
–
where DAC is the integer value from 0-1023 represented
by the serial port register bits DAC[9:0] and OCT is the
integer value from 0-15 represented by the serial port
register bits OCT [3:0].
The LTC6903/LTC6904 contain an internal feedback loop
which controls a high frequency square wave VCO operat-
ing between 34MHz and 68MHz. The internal feedback
loop frequency is set over an octave by a 10-bit resistor
DAC. The VCO tracks the internal feedback loop frequency
and the output frequency of the VCO is divided by one of
sixteen possible powers of two.
Higher VCO frequencies and lower output divider settings
can result in higher output jitter. Random jitter at the lower
Use the following two steps to choose binary numbers
“OCT” and “DAC” in order to set frequency “f”:
1) Use Table 1 to Choose “OCT” or use the following
formula, rounding down to the integer value less than or
equal to the result.
OCT
f
=
3 322
.
1039
log
2) Choose “DAC” by the following formula, rounding DAC
to the nearest integer:
DAC
Hz
(
f
OCT
=
+
2048
2078
2
10
–
)
(
)
frequency ranges is very low because of the high output
divisor.
The higher frequency settings will display some determin-
istic jitter from coupling between the control loop and the
output. This shows up in the frequency spectrum as spurs
separated from the fundamental frequency by 1MHz to
2MHz.
THEORY OF OPERATIOU
2
1
3
4
6
7
5
8
–
+
MASTER
OSCILLATOR
f
MO
= 68MHz k
I
SET
V
+
– V
SET
PROGRAMMABLE
DIVIDER
+
I
SET
V
SET
A1
SERIAL PORT
V
+
OE
GND
DAC
OCT
SDI
SCK
SEN (LTC6903)
ADR (LTC6904)
CLK
CLK
6903 BD
BLOCK DIAGRA
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| LTC6903IMS8#PBF | 功能描述:IC OSC SILICON 68MHZ 8-MSOP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)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(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LTC6903IMS8#TR | 功能描述:IC OSC SILICON 68MHZ 8MSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)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(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LTC6903IMS8#TRPBF | 功能描述:IC OSC SILICON 68MHZ 8-MSOP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)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(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LTC6904 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1kHz to 68MHz Serial Port Programmable Oscillator |
| LTC6904CMS8 | 功能描述:IC OSC SILICON 68MHZ 8-MSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)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(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
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