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参数资料
| 型号： | DS1089LU-23C+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC ECONOSCILLATOR SS 8-USOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 系列： | EconOscillator™ |
| 类型： | 时钟发生器 |
| PLL： | 无 |
| 输入： | 时钟 |
| 输出： | 时钟 |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:1 |
| 差分 - 输入:输出： | 无/无 |
| 频率 - 最大： | 33.3MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 2.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
DS1089L
3.3V Center Spread-Spectrum EconOscillator
8
_____________________________________________________________________
Output Control
Two user control signals control the output. The output
enable pin (OE) gates the output buffer and the power-
down pin (PDN) disables the master oscillator and
turns off the output for power-sensitive applications.
(Note: the power-down command must persist for at
least two output frequency cycles plus 10s for
deglitching purposes.) On power-up, the output is dis-
abled until power is stable and the master oscillator has
generated 512 clock cycles.
Additionally, the OE input is OR’ed with the OE bit in the
ADDR register, allowing for either hardware or software
gating of the output waveform (see the Block Diagram).
Both controls feature a synchronous enable, which
ensures that there are no output glitches when the out-
put is enabled. The synchronous enable also ensures a
constant time interval (for a given frequency setting)
from an enable signal to the first output transition.
Dither Generator
The DS1089L has the ability to reduce radiated emis-
sion peaks. The output frequency can be dithered by
±1%, ±2%, ±4%, or ±8% symmetrically around the pro-
grammed center frequency. Although the output fre-
quency changes when the dither is enabled, the duty
cycle does not change.
The dither rate (fMOD) is controlled by the J0 and J1
bits in the PRESCALER register and is enabled with the
SPRD pin. The maximum spectral attenuation occurs
when the prescaler is set to 1. The spectral attenuation
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 spec-
tral emission limits are imposed on the higher frequen-
cies where the prescaler is set to a low divider ratio.
A triangle-wave generator injects an offset element into
the master oscillator to dither its output. The dither rate
can be calculated based on the master oscillator fre-
quency (see Equation 2).
Equation 2
where fMOD = dither frequency, fMOSC = master oscilla-
tor frequency, and n = divider setting (see Table 2).
Dither Percentage Settings
The dither amplitude (measured in percentage of the
master oscillator center frequency) is set using the J2
and J3 bits in the ADDR register. This circuit uses a
sense current from the master oscillator bias circuit to
adjust the amplitude of the triangle-wave signal to a
voltage level that modulates the master oscillator to a
percentage of its factory-programmed center frequen-
cy. This percentage is set in the application to be
±1%,
±2%, ±4%, or ±8% (see Table 3).
The location of bits P3, P2, P1, P0, J1, and J0 in the
PRESCALER register and bits J3 and J2 in the ADDR
register are shown in the Register Summary section.
f
MOD
MOSC
=
n
Table 2. Dither Frequency Settings
BITS J1, J0
DITHER FREQUENCY
00
No dither
01
fMOSC / 2048
10
fMOSC / 4096
11
fMOSC / 8192
Table 3. Dither Percentage Settings
BITS J3, J2
DITHER AMOUNT
00
±1%
01
±2%
10
±4%
11
±8%
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相关代理商/技术参数 |
参数描述 |
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| DS1089LU-23C+ | 功能描述:可编程振荡器 3.3V Center Spread Spctrm EconOscillatr RoHS:否 制造商:IDT 封装 / 箱体:5 mm x 7 mm x 1.5 mm 频率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 频率稳定性:+/- 50 PPM 电源电压:3.63 V 负载电容:10 pF 端接类型:SMD/SMT 输出格式:LVPECL 最小工作温度:- 40 C 最大工作温度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封装: |
| DS1089LU-266 | 功能描述:可编程振荡器 3.3V Center Spread Spctrm EconOscillatr RoHS:否 制造商:IDT 封装 / 箱体:5 mm x 7 mm x 1.5 mm 频率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 频率稳定性:+/- 50 PPM 电源电压:3.63 V 负载电容:10 pF 端接类型:SMD/SMT 输出格式:LVPECL 最小工作温度:- 40 C 最大工作温度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封装: |
| DS1089LU-266+ | 功能描述:可编程振荡器 3.3V Center Spread Spctrm EconOscillatr RoHS:否 制造商:IDT 封装 / 箱体:5 mm x 7 mm x 1.5 mm 频率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 频率稳定性:+/- 50 PPM 电源电压:3.63 V 负载电容:10 pF 端接类型:SMD/SMT 输出格式:LVPECL 最小工作温度:- 40 C 最大工作温度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封装: |
| DS1089LU-450 | 功能描述:可编程振荡器 RoHS:否 制造商:IDT 封装 / 箱体:5 mm x 7 mm x 1.5 mm 频率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 频率稳定性:+/- 50 PPM 电源电压:3.63 V 负载电容:10 pF 端接类型:SMD/SMT 输出格式:LVPECL 最小工作温度:- 40 C 最大工作温度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封装: |
| DS1089LU-450+ | 功能描述:可编程振荡器 3.3V Center Spread Spctrm EconOscillatr RoHS:否 制造商:IDT 封装 / 箱体:5 mm x 7 mm x 1.5 mm 频率:15.476 MHz to 866.67, 975 MHz to 1300 MHz 频率稳定性:+/- 50 PPM 电源电压:3.63 V 负载电容:10 pF 端接类型:SMD/SMT 输出格式:LVPECL 最小工作温度:- 40 C 最大工作温度:+ 85 C 尺寸:7 mm W x 5 mm L x 1.5 mm H 封装: |
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