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參數(shù)資料
| 型號： | AD9551/PCBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/40頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9951 |
| 設(shè)計(jì)資源： | AD9551 Schematic AD9551 BOM AD9551 Layout |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 計(jì)時(shí)，時(shí)鐘發(fā)生器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD9551 |
| 主要屬性： | 2 輸入，2 輸出，VCO |
| 次要屬性： | 圖形用戶界面，USB 接口 |
| 已供物品： | 板 |
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AD9551
Rev. B | Page 24 of 40
,
re
en in Step 4 applies here,
he constraints for NA
elationship
the previous example
lues of N, Q, and Y constitute the respective input
s
input divider. If FRACx = 0, then the input division factor is
an integer and the SDM is not required (it can be bypassed).
() (
)
The choice of MODx affects the jitter performance of the
input section in a manner similar to the feedback dividers.
However, the spectral spacing of the spurs for the input
SDMs is as follows:
As in Step 4, use long division to convert the fraction, X/Y
to an integer, N, and a proper fraction, R/Y (R and Y a
integers). The same caution giv
regarding the need to use long division rather than a
calculator or a math program.
Given the example of X = 14,867,712 and Y = 616,200,
long division yields the following: N = 24 and R/Y =
78,912/616,200, which reduces to R/Y = 3,288/25,675. The
only caveats are that N must meet t
and NB given in the Output/Input Frequency R
hat Y < 219 (524,288).
section and t
Next, use R and Y to compute the following:
Q
= 2R Y
Using R = 3288 and Y = 25,675 from
yields
Q
= 2 × 3288 25,675 = 19,099
These va
divider values: Nx = 24, FRACx = 19,099, and MODx =
25,675.
In the example, FRACx is nonzero, so the division value i
an integer plus the fractional component, FRACx/MODx.
This implies that the input SDM is necessary as part of the
x
REF
x
FRAC
N
MOD
f
x
+
×
=
Δ
1
2
The input SDMs are similar to the feedback SDM in that it
is desirable to scale MODx and FRACx by the integer part of
219, divided by the value of MODx that was calculated pre-
viously in Step 5. In the example calculation, the value of
MODx is 25,675, which leads to a scale factor of 20 (the integer
part of 219/25,675). A scale factor of 20 yields the following
results: FRACx = 19,099 × 20 = 381,980 and MODx =
25,675×20 = 513,500.
However, these FRACx and MODx values are different from
those that appear in Table 13 (A[3:0] = 0010). The reason is
that a scale factor of 6 (instead of 20) was found to yield the
most acceptable overall performance. A scale factor of 6
6 = 114,594, and MODx = 25,675 × 6 = 154,050.
LOW DROPOUT (LDO) REGULATORS
The AD9551 is powered from a single 3.3 V supply and contains
on-chip LDO regulators for each function to eliminate the need
for external LDOs. To ensure optimal performance, each LDO
output should have a 0.47 μF capacitor connected between its
access pin and ground.
Note that for best performance, the LDO bypass capacitors
must be placed in close proximity to the device.
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