參數(shù)資料
型號: IDT5V19EE604NDGI
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 28/29頁
文件大?。?/td> 0K
描述: IC PLL CLK GEN 200MHZ 28VFQFPN
產(chǎn)品培訓(xùn)模塊: VersaClock™ III Programmable Clocks
特色產(chǎn)品: VersaClock III Timing Devices
標(biāo)準(zhǔn)包裝: 75
系列: VersaClock™ III
類型: 時鐘發(fā)生器,多路復(fù)用器
PLL: 帶旁路
輸入: LVCMOS,LVTTL,晶體
輸出: LVCMOS,LVTTL
電路數(shù): 1
比率 - 輸入:輸出: 2:6
差分 - 輸入:輸出: 無/無
頻率 - 最大: 200MHz
除法器/乘法器: 是/是
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 28-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 28-VFQFPN(4x4)
包裝: 管件
其它名稱: 800-1922
IDT5V19EE604
EEPROM PROGRAMMABLE VCXO CLOCK GENERATOR
CLOCK SYNTHESIZER
IDT EEPROM PROGRAMMABLE VCXO CLOCK GENERATOR
8
IDT5V19EE604
REV M 092412
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 two sets of SD samples. The
NSSC bits determine how many of these samples are
repeated 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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