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| 型号： | 5V19EE904NLGI |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | 5V SERIES, PLL BASED CLOCK DRIVER, 7 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), QCC32 |
| 封装： | 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件页数： | 28/29页 |
| 文件大小： | 292K |
| 代理商： | 5V19EE904NLGI |
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IDT5V19EE904
EEPROM PROGRAMMABLE VCXO CLOCK GENERATOR
CLOCK SYNTHESIZER
IDT EEPROM PROGRAMMABLE VCXO CLOCK GENERATOR
8
IDT5V19EE904
REV H 042211
SS_OFFSET[5:0]
These bits are used to program the fractional offset with
respect to the nominal M integer value. For center spread,
the SS_OFFSET is set to '0' so that the spread spectrum
waveform is centered about the nominal M (Mnom) value.
For down spread, the SS_OFFSET > '0' such the spread
spectrum waveform is centered about the (Mideal -1
+SS_Offset) value. The downspread percentage can be
thought of in terms of center spread. For example, a
downspread of -1% can also be considered as a center
spread of ±0.5% but with Mnom shifted down by one and
offset. The SS_OFFSET has integer values ranging from 0
to 63.
SD[3:0]
These bits are used to shape the profile of the spread
spectrum waveform. These are delta-encoded samples of
the waveform. There are twelve sets of SD samples. The
NSSC bits determine how many of these samples are used
for the waveform. The sum of these delta-encoded samples
(sigma delta- encoded samples) determine the amount of
spread and should not exceed (63 - SS_OFFSET). The
maximum spread is inversely proportional to the nominal M
integer value.
DITH
This bit is used for dithering the sigma-delta-encoded
samples. This will randomize the least-significant bit of the
input to the spread spectrum modulator. Set the
bit to '1' to
enable dithering.
X2
This bit will double the total value of the
sigma-delta-encoded-samples which will increase the
amplitude of the spread spectrum waveform by a factor of
two. When X2 is '0', the amplitude remains nominal but if set
to '1', the amplitude is increased by x2. The following
equations govern how the spread spectrum is set:
TSSC = TSSC[3:0] + 2 (Eq. 2)
NSSC = NSSC[2:0] * 2 (Eq. 3)
SD[3:0]K = SJ+1(unencoded) - SJ(unencoded) (Eq. 4)
where SJ is the unencoded sample out of a possible 12 and
SDK is the delta-encoded sample out of a possible 12.
Amplitude = ((2*N[11:0] + A[3:0] + 1) * Spread% / 100) /2
(Eq. 5)
if 1 < Amplitude < 2, then set X2 bit to '1'.
Modulation frequency:
FPFD = FIN / D (Eq. 6)
FVCO = FPFD * MNOM (Eq. 7)
FSSC = FPFD / (4 * Nssc * Tssc) (Eq. 8)
Spread:
ΣΔ = SD0 + SD1 + SD2 + …+ SD11
the number of samples used depends on the NSSC value
ΣΔ< 63 - SS_OFFSET
±Spread% =
(
ΣΔ * 100)/(64 * (2*N[11:0] + A[3:0] + 1) (Eq. 9)
±Max Spread% / 100 = 1 / MNOM or 2 / MNOM (X2=1)
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相关代理商/技术参数 |
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| 5V19EE904NLGI8 | 功能描述:时钟发生器及支持产品 EEPROM PROGRAMMABLE PLL AND VCXO RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| 5V1A-ADAPTER | 制造商:Distributed By MCM 功能描述:5V 1A Switching AC Power Supply - Micro USB |
| 5V1A-USB | 制造商:Gravitech 功能描述:USB WALL ADAPTER 5V 1A |
| 5V1BC | 制造商:SEMTECH_ELEC 制造商全称:SEMTECH ELECTRONICS LTD. 功能描述:Silicon Epitaxial Planar Zener Diodes |
| 5V1BCA | 制造商:SEMTECH_ELEC 制造商全称:SEMTECH ELECTRONICS LTD. 功能描述:Silicon Epitaxial Planar Zener Diodes |
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