參數(shù)資料
型號(hào)： AD9518-3A/PCBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/64頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD9518-3A
設(shè)計(jì)資源： AD9518 Schematics
AD9518 Gerber Files
AD9518-3 BOM
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： AD9518-3A
主要屬性： 2 輸入，6 輸出，2.0GHz VCO
次要屬性： LVPECL 輸出邏輯
已供物品： 板
AD9518-3
Data Sheet
Rev. B | Page 24 of 64
Internal VCO and Clock Distribution
When using the internal VCO and PLL, the VCO divider must
be employed to ensure that the frequency presented to the channel
dividers does not exceed their specified maximum frequency of
1600 MHz (see Table 3). The internal PLL uses an external loop
filter to set the loop bandwidth. The external loop filter is also
crucial to the loop stability.
When using the internal VCO, it is necessary to calibrate the
VCO (Register 0x018[0]) to ensure optimal performance.
For internal VCO and clock distribution applications, use the
register settings that are shown in Table 23.
Table 23. Settings When Using an Internal VCO
Register
Function
0x010[1:0] = 00b
PLL normal operation (PLL on).
0x010 to 0x01D
PLL settings. Select and enable a reference
input; set R, N (P, A, B), PFD polarity, and ICP
according to the intended loop configuration.
0x018[0] = 0b,
0x232[0] = 1b
Reset VCO calibration. This process is not
required the first time after power-up, but it
must be performed subsequently.
0x1E0[2:0]
Set VCO divider to divide-by-2, divide-by-3,
divide-by-4, divide-by-5, or divide-by-6.
0x1E1[0] = 0b
Use VCO divider as the source for the
distribution section.
0x1E1[1] = 1b
Select VCO as the source.
0x018[0] = 1b,
0x232[0] = 1b
Initiate VCO calibration.
PROGRAMMABLE
N DELAY
REFIN (REF1)
REFIN (REF2)
CLK
REF1
REF2
STATUS
R
DIVIDER
VCO STATUS
PROGRAMMABLE
R DELAY
REFERENCE
SWITCHOVER
REF_ SEL
CPRSET VCP
VS
GND
RSET
DISTRIBUTION
REFERENCE
REFMON
CP
STATUS
LD
P, P + 1
PRESCALER
A/B
COUNTERS
N DIVIDER
BYPASS
LF
LOW DROPOUT
REGULATOR (LDO)
VCO
PHASE
FREQUENCY
DETECTOR
LOCK
DETECT
CHARGE
PUMP
PL
L
RE
F
E
RE
NCE
HOLD
OUT0
OUT1
OUT0
OUT1
LVPECL
DIVIDE BY
1 TO 32
OUT2
OUT3
OUT2
OUT3
LVPECL
DIVIDE BY
1 TO 32
0
1
DIVIDE BY
2, 3, 4, 5, OR 6
PD
SYNC
RESET
SCLK
SDIO
SDO
CS
DIGITAL
LOGIC
SERIAL
CONTROL
PORT
OUT4
OUT5
OUT4
OUT5
LVPECL
DIVIDE BY
1 TO 32
06
43
2-
03
0
AD9518-3
Figure 29. Internal VCO and Clock Distribution
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