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| 型号： | DS1086Z+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC ECONOSILL 3.3V SS 8-SOIC |
| 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： | 2,500 |
| 系列： | EconOscillator™ |
| 类型： | 扩展频谱时钟发生器 |
| PLL： | 无 |
| 输入： | 时钟 |
| 输出： | 时钟 |
| 电路数： | 1 |
| 比率 - 输入:输出： | 2:1 |
| 差分 - 输入:输出： | 无/无 |
| 频率 - 最大： | 133MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS1086
Spread-Spectrum EconOscillator
8
_______________________________________________________________________________________
Detailed Description
A block diagram of the DS1086 is shown in Figure 3.
The internal master oscillator generates a square wave
with a 66MHz to 133MHz frequency range. The fre-
quency of the master oscillator can be programmed
with the DAC register over a two-to-one range in 10kHz
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
2% or 4%. The dither is controlled by the J0 bit in the
PRESCALER register and 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.
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, and a constant time interval (for a
given frequency setting) from an enable signal to the
first output transition.
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.
OFFSET
FREQUENCY RANGE (MHz)
OS - 6
61.44 to 71.67
OS - 5
66.56 to 76.79
OS - 4
71.68 to 81.91
OS - 3
76.80 to 87.03
OS - 2
81.92 to 92.15
OS - 1
87.04 to 97.27
OS*
92.16 to 102.39
OS + 1
97.28 to 107.51
OS + 2
102.40 to 112.63
OS + 3
107.52 to 117.75
OS + 4
112.64 to 122.87
OS + 5
117.76 to 127.99
OS + 6
122.88 to 133.11
*
Factory default setting. OS is the integer value of the 5 LSBs
of the RANGE register.
REGISTER
ADDR
MSB
BINARY
LSB
FACTORY
DEFAULT
ACCESS
PRESCALER
02h
X1
XX
J0
P3
P2
P1
P0
11100000b
R/W
DAC HIGH
08h
b9
b8
b7
b6
b5
b4
b3
b2
01111101b
R/W
DAC LOW
09h
b1
b0
X0
00000000b
R/W
OFFSET
0Eh
X1
b4
b3
b2
b1
b0
1 1 1 - - - - - b
R/W
ADDR
0Dh
X1
WC
A2
A1
A0
11110000b
R/W
RANGE
37h
XX
b4
b3
b2
b1
b0
xxx- - - - - b
R
WRITE EE
3Fh
NO DATA
——
Table 1. Register Summary
X0 = Don’t care, reads as zero.
X1 = Don’t care, reads as one.
XX = Don’t care, reads indeterminate.
X = Don’t care.
Table 2. Offset Settings
*
The power-down command must persist for at least two out-
put frequency cycles plus 10s for deglitching purposes.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1087L | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3.3V Spread-Spectrum EconOscillator |
| DS1087LU-11G | 功能描述:可编程振荡器 3.3V Spread-Spectrum EconOscillator 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: |
| DS1087LU-11G/T&R | 制造商:Maxim Integrated Products 功能描述:IC ECONOSCILLATOR SS 8-USOP |
| DS1087LU-11G/T&R | 功能描述:可编程振荡器 3.3V Spread-Spectrum EconOscillator 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: |
| DS1087LU-11G+ | 功能描述:可编程振荡器 3.3V Spread-Spectrum EconOscillator 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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