參數資料
型號: AD9520-4BCPZ
廠商: Analog Devices Inc
文件頁數: 35/80頁
文件大小: 0K
描述: IC CLOCK GEN 1.6GHZ VCO 64LFCSP
設計資源: Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121)
Phase Coherent FSK Modulator (CN0186)
標準包裝: 1
類型: 時鐘發(fā)生器,扇出配送
PLL:
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,LVPECL
電路數: 1
比率 - 輸入:輸出: 2:12,2:24
差分 - 輸入:輸出: 是/是
頻率 - 最大: 1.8GHz
除法器/乘法器: 是/無
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: 64-VFQFN 裸露焊盤,CSP
供應商設備封裝: 64-LFCSP-VQ(9x9)
包裝: 托盤
產品目錄頁面: 776 (CN2011-ZH PDF)
配用: AD9520-4/PCBZ-ND - BOARD EVAL FOR AD9520-4
AD9520-4
Data Sheet
Rev. A | Page 40 of 80
A flowchart of the automatic/internal holdover function
operation is shown in Figure 47.
NO
YES
PLL ENABLED
DLD == LOW
WAS
LD PIN == HIGH
WHEN DLD WENT
LOW?
HIGH IMPEDANCE
CHARGE PUMP
REFERENCE
EDGE AT PFD?
RELEASE
CHARGE PUMP
HIGH IMPEDANCE
DLD == HIGH
YES
07217-
0
69
LOOP OUT OF LOCK. DIGITAL LOCK
DETECT SIGNAL GOES LOW WHEN THE
LOOP LEAVES LOCK, AS DETERMINED
BY THE PHASE DIFFERENCE AT THE
INPUT OF THE PFD.
REG 0x01D[3]: LD PIN COMPARATOR ENABLE.
0b = DISABLE; 1b = ENABLE. WHEN DISABLED,
THE HOLDOVER FUNCTION ALWAYS SENSES
THE LD PIN AS HIGH.
CHARGE PUMP IS MADE HIGH IMPEDANCE.
PLL COUNTERS CONTINUE
OPERATING NORMALLY.
CHARGE PUMP REMAINS HIGH IMPEDANCE
UNTIL THE REFERENCE RETURNS.
TAKE CHARGE PUMP OUT OF
HIGH IMPEDANCE. PLL CAN NOW RESETTLE.
WAIT FOR DLD TO GO HIGH. THIS TAKES
5 TO 255 CYCLES (PROGRAMMING OF
THE DLD DELAY COUNTER) WITH THE
REFERENCE AND FEEDBACK CLOCKS
INSIDE THE LOCK WINDOW AT THE PFD.
THIS ENSURES THAT THE HOLDOVER
FUNCTION WAITS FOR THE PLL TO SETTLE
AND LOCK BEFORE THE HOLDOVER
FUNCTION CAN BE RETRIGGERED.
Figure 47. Flowchart of Automatic/Internal Holdover Mode
The following registers affect the automatic/internal holdover
function:
Register 0x018[6:5]—lock detect counter. This changes how
many consecutive PFD cycles with edges inside the lock
detect window are required for the DLD indicator to indicate
lock. This impacts the time required before the LD pin can
begin to charge as well as the delay from the end of a holdover
event until the holdover function can be reengaged.
Register 0x018[3]—disable digital lock detect. This bit must
be set to 0b to enable the DLD circuit. Automatic/internal
holdover does not operate correctly without the DLD function
enabled.
Register 0x01A[5:0]—lock detect pin control. Set these bits
to 000100b to program the current source lock detect mode
if using the LD pin comparator. Load the LD pin with a
capacitor of an appropriate value.
Register 0x01D[3]—LD pin comparator enable. 1b = enable;
0b = disable. When disabled, the holdover function always
senses the LD pin as high.
Register 0x01D[1]—external holdover control.
Register 0x01D[0]—holdover enable. If holdover is disabled,
both external and automatic/internal holdover are disabled.
In the following example, automatic holdover is configured with
Automatic reference switchover, prefer REF1.
Digital lock detect: five PFD cycles, high range window.
Automatic holdover using the LD pin comparator.
The following registers are set (in addition to the normal PLL
registers):
Register 0x018[6:5] = 00b; lock detect counter = five cycles.
Register 0x018[4] = 0b; digital lock detect window = high
range.
Register 0x018[3] = 1b; disable DLD normal operation.
Register 0x01A[5:0] = 000100b; program LD pin control to
current source lock detect mode.
Register 0x01C[4] = 1b; enable automatic switchover.
Register 0x01C[3] = 0b; prefer REF1.
Register 0x01C[2:1] = 11b; enable REF1 and REF2 input
buffers.
Register 0x01D[3] = 1b; enable LD pin comparator.
Register 0x01D[1] = 0b; disable external holdover mode and
use automatic/internal holdover mode.
Register 0x01D[0] = 1b; enable holdover.
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