参数资料
型号: AD9547BCPZ-REEL7
厂商: Analog Devices Inc
文件页数: 42/104页
文件大小: 0K
描述: IC CLOCK GEN/SYNCHRONIZR 64LFCSP
产品变化通告: AD9547 Mask Change 20/Oct/2010
标准包装: 750
类型: 时钟/频率发生器,同步器
PLL:
主要目的: 以太网,SONET/SDH,Stratum
输入: CMOS,LVDS,LVPECL
输出: CMOS,LVDS,LVPECL
电路数: 1
比率 - 输入:输出: 2:2
差分 - 输入:输出: 是/是
频率 - 最大: 750kHz
电源电压: 1.71 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 带卷 (TR)
AD9547
Data Sheet
Rev. E | Page 42 of 104
active input reference. The detection of the rising edge synchro-
nizes the distribution output.
When sync source = 10, the rising edge of the primary synchro-
nization signal triggers the circuitry that detects a rollover of the
DDS accumulator (after processing by the DPLL feedback divider).
This corresponds to the zero crossing of the output of the phase-to-
amplitude converter in the DDS (less the open-loop phase offset
stored in Register 0x030D and Register 0x030E). The detection
of the DPLL feedback edge synchronizes the distribution output.
Active Reference Synchronization (Zero Delay)
Active reference synchronization is the term applied to the case
when sync source = 01 (Register 0x0402, Bits[5:4]). Referring to
Figure 47, this means that the active reference sync path is active
because Bit 4 = 1, enabling the lower AND gate and disabling
the upper AND gate. The edge detector in the active reference
sync block monitors the rising edges of the active reference
(the mux selects the active reference automatically). The edge
detector is armed via the primary synchronization signal, which
is one of the four inputs to the OR gate (typically the direct sync
source). As soon as the edge detector is armed, its output goes high,
which stalls the output dividers in the clock distribution block.
Furthermore, once armed, a rising edge from the active reference
forces the output of the edge detector low. This restarts the output
dividers, thereby synchronizing the clock distribution block.
The term zero delay applies because it provides a means to edge-
align the output signal with the active input reference signal.
Typically, zero-delay architectures use the output signal in the
feedback loop of a PLL to track input/output edge alignment.
Active reference synchronization, however, operates open loop.
That is, synchronization of the output via the distribution
synchronization logic occurs on a single edge of the active
reference.
The fact that an active reference edge triggers the falling edge of
the synchronization pulse means that the falling edge is asynchro-
nous to the signal that clocks the distribution output dividers
(CLKINx). Therefore, the output clock distribution logic reclocks
the internal synchronization pulse to synchronize it with the
CLKINx signal. This means that the output dividers restart after
a deterministic delay associated with the reclocking circuitry.
This deterministic delay has two components. The first deter-
ministic delay component is four or five periods of the CLKINx
signal. The one period uncertainty is due to the unknown position
of the asynchronous reference clock edge relative to the CLKINx
signal. The second deterministic delay component is one output
period of the distribution divider.
MULTIFUNCTION PIN
SYNC SOURCE
0
1
REGISTER
0x0402[5]
SYSCLK/4
DPLL
FEEDBACK
EDGE
REGISTER
0x0402[4]
REF A
REF BB
RESET
EDGE
DETECT
EDGE
DETECT
ARM
EDGE
DETECT
ARM
DIRECT SYNC
DPLL EDGE SYNC
ACTIVE REFERENCE SYNC
EEPROM SYNC
SOURCE
PRIMARY
SYNCHRONIZATION
SIGNAL
DIRECT SYNC
SOURCE
(ADDRESS DX 0x0A02[1])
AUTOMATIC SYNC
SOURCE
(REGISTER DX 0x0403)
TO CLOCK
DISTRIBUTION
SYNCHRONIZATION
CONTROL
STALL
DIVIDERS
SYNC OUTPUT
DISTRIBUTION
TO MULTIFUNCTION
PIN STATUS LOGIC
08
300-
02
3
Figure 47. Output Synchronization Block Diagram
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