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5V49EE904NLGI8 bảng dữ liệu(PDF) 8 Page - Integrated Device Technology

tên linh kiện 5V49EE904NLGI8
Giải thích chi tiết về linh kiện  EEPROM PROGRAMMABLE CLOCK GENERATOR
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nhà sản xuất  IDT [Integrated Device Technology]
Trang chủ  http://www.idt.com
Logo IDT - Integrated Device Technology

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IDT5V49EE904
EEPROM PROGRAMMABLE CLOCK GENERATOR
CLOCK SYNTHESIZER
IDT® EEPROM PROGRAMMABLE CLOCK GENERATOR
8
IDT5V49EE904
REV H 022310
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:
Σ∆ = SD0 + SD1 + SD2 + …+ SD11
the number of samples used depends on the NSSC value
Σ∆< 63 - SS_OFFSET
±Spread% =
(
Σ∆ * 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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