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參數(shù)資料
| 型號： | DS1086LU-21D+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ECONOSCILLATOR SS 8-USOP |
| 其它有關(guān)文件： | Automotive Product Guide |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 系列： | EconOscillator™ |
| 類型： | 擴展頻譜時鐘發(fā)生器 |
| PLL： | 無 |
| 輸入： | 時鐘 |
| 輸出： | 時鐘 |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:1 |
| 差分 - 輸入:輸出： | 無/無 |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
3.3V Spread-Spectrum EconOscillator
Maxim Integrated
9
DS1086L
Detailed Description
A block diagram of the DS1086L is shown in Figure 3.
The internal master oscillator generates a square wave
with a 33.3MHz to 66.6MHz frequency range. The fre-
quency of the master oscillator can be programmed
with the DAC register over a two-to-one range in 5kHz
steps. The master oscillator range is larger than the
range possible with the DAC step size, so the OFFSET
register is used to select a smaller range of frequencies
over which the DAC spans. The prescaler can then be
set to divide the master oscillator frequency by 2x
(where x equals 0 to 8) before routing the signal to the
output (OUT) pin.
A programmable triangle-wave generator injects an off-
set element into the master oscillator to dither its output
0.5%, 1%, 2%, 4%, or 8%. The dither magnitude is con-
trolled by the JS2, JS1, and JS0 bits in the PRESCALER
word and enabled with the SPRD pin. Futhermore, the
dither rate is controlled by the JS4 and JS3 bits in the
PRESCALER word and determines the frequency of the
dither. The maximum spectral attenuation occurs when
the prescaler is set to 1 and is reduced by 2.7dB for
every factor of 2 that is used in the prescaler. This
happens because the prescaler’s divider function tends
to average the dither in creating the lower frequency.
However, the most stringent spectral emission limits are
imposed on the higher frequencies where the prescaler
is set to a low divider ratio.
The external control input, OE, gates the clock output
buffer. The PDN pin disables the master oscillator and
turns off the clock output for power-sensitive applica-
tions*. On power-up, the clock output is disabled until
power is stable and the master oscillator has generated
512 clock cycles. Both controls feature a synchronous
enable that ensures there are no output glitches when
the output is enabled.
The control registers are programmed through a 2-wire
interface and are used to determine the output frequen-
cy and settings. Once programmed into EEPROM,
since the register settings are NV, the settings only
need to be reprogrammed if it is desired to reconfigure
the device.
SDA
VCC
SCL
2-WIRE
INTERFACE
VCC
DAC
OFFSET
EEPROM CONTROL
REGISTERS
PRESCALER
ADDR
RANGE
SPRD
PDN
OUT
OE
DAC
TRIANGLE WAVE
GENERATOR
VOLTAGE-CONTROLLED
OSCILLATOR
PRESCALER
BY 1, 2, 4...256
GND
MASTER
OSCILLATOR
OUTPUT
DITHER SIGNAL
DITHER
CONTROL
FREQUENCY
CONTROL VOLTAGE
DS1086L
Figure 3. Block Diagram
*
The power-down command must persist for at least two out-
put frequency cycles plus 10μs for deglitching purposes.
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| DS1086LU-222+ | 功能描述:可編程振蕩器 SS OSC 22.1184Mhz RoHS:否 制造商:IDT 封裝 / 箱體:5 mm x 7 mm x 1.5 mm 頻率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 頻率穩(wěn)定性:+/- 50 PPM 電源電壓:3.63 V 負(fù)載電容:10 pF 端接類型:SMD/SMT 輸出格式:LVPECL 最小工作溫度:- 40 C 最大工作溫度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封裝: |
| DS1086LU-222+T | 功能描述:可編程振蕩器 SS OSC 22.1184Mhz RoHS:否 制造商:IDT 封裝 / 箱體:5 mm x 7 mm x 1.5 mm 頻率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 頻率穩(wěn)定性:+/- 50 PPM 電源電壓:3.63 V 負(fù)載電容:10 pF 端接類型:SMD/SMT 輸出格式:LVPECL 最小工作溫度:- 40 C 最大工作溫度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封裝: |
| DS1086LU-40S+ | 功能描述:可編程振蕩器 RoHS:否 制造商:IDT 封裝 / 箱體:5 mm x 7 mm x 1.5 mm 頻率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 頻率穩(wěn)定性:+/- 50 PPM 電源電壓:3.63 V 負(fù)載電容:10 pF 端接類型:SMD/SMT 輸出格式:LVPECL 最小工作溫度:- 40 C 最大工作溫度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封裝: |
| DS1086LU-40S+T | 功能描述:可編程振蕩器 RoHS:否 制造商:IDT 封裝 / 箱體:5 mm x 7 mm x 1.5 mm 頻率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 頻率穩(wěn)定性:+/- 50 PPM 電源電壓:3.63 V 負(fù)載電容:10 pF 端接類型:SMD/SMT 輸出格式:LVPECL 最小工作溫度:- 40 C 最大工作溫度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封裝: |
| DS1086LU-440/V+ | 功能描述:可編程振蕩器 3.3V Spread-Spectrum EconOscillator RoHS:否 制造商:IDT 封裝 / 箱體:5 mm x 7 mm x 1.5 mm 頻率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 頻率穩(wěn)定性:+/- 50 PPM 電源電壓:3.63 V 負(fù)載電容:10 pF 端接類型:SMD/SMT 輸出格式:LVPECL 最小工作溫度:- 40 C 最大工作溫度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封裝: |
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