参数资料
型号: AD9577BCPZ-R7
厂商: Analog Devices Inc
文件页数: 24/44页
文件大小: 0K
描述: IC CLOCK GENERATOR 40LFCSP
标准包装: 750
系列: PCI Express® (PCIe)
类型: 扇出缓冲器(分配),网络时钟发生器
PLL:
主要目的: 以太网,PCI Express(PCIe),SONET/SDH
输入: 时钟,晶体
输出: LVCMOS,LVDS,LVPECL
电路数: 1
比率 - 输入:输出: 2:5
差分 - 输入:输出: 无/是
频率 - 最大: 637.5MHz
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 40-WFQFN 裸露焊盘,CSP
供应商设备封装: 40-LFCSP-WQ(6x6)
包装: 带卷 (TR)
其它名称: AD9577BCPZ-R7TR
AD9577
Data Sheet
Rev. 0 | Page 30 of 44
OUTPUT CHANNEL DIVIDERS
Between each VCO and its associated chip outputs, there are
two divider stages: a VCO divider that has a divide ratio between
2 and 6 and an output divider that can be set to divide between
1 and 32. This cascade of dividers allows a minimum output
channel divide ratio of 2 and a maximum of 192. With VCO
frequencies ranging between 2.15 GHz and 2.55 GHz, the part
can be programmed to spot frequencies over a continuous
frequency range of from 11.2 MHz to 200 MHz, and it can be
programmed to spot frequencies over a continuous frequency
range of 200 MHz and 637.5 MHz, with only a few small gaps.
Table 19. Divider Ratio Setting Registers
Divider
I2C Registers
Parameter
Divide
Range
Channel 0 VCO divider
ADV0[7:5]
V0
2 to 6
Channel 1 VCO divider
ADV1[7:5]
V1
2 to 6
Channel 2 VCO divider
BDV0[7:5]
V2
2 to 6
Channel 3 VCO divider
BDV1[7:5]
V3
2 to 6
Channel 0 output divider
ADV0[4:0]
D0
Channel 1 output divider
ADV1[4:0]
D1
Channel 2 output divider
BDV0[4:0]
D2
Channel 3 output divider
BDV1[4:0]
D3
1 Set to 00000 for divide by 32.
Asserting the SyncCh01 or SyncCh23 bits (Register ADV2[0]
or Register BDV2[0]) allows each PLL output channel to use a
common VCO divider. This feature allows the OUT0/OUT1 and
OUT2/OUT3 output ports to have minimal skew when their
relative output channel divide ratio is an integer multiple.
Duty-cycle correction circuitry ensures that the output duty cycle
remains at 50%.
V0[2:0]
D0[4:0]
OUT0
OUTPUT
DIVIDER
VCO
DIVIDER
V1[2:0]
D1[4:0]
OUT1
OUTPUT
DIVIDER
VCO
DIVIDER
VCO
V2[2:0]
D2[4:0]
OUT2
OUTPUT
DIVIDER
VCO
DIVIDER
V3[2:0]
D3[4:0]
OUT3
OUTPUT
DIVIDER
VCO
DIVIDER
VCO
09
28
4-
0
39
Figure 35. Output Channel Divider Signal Path
OUTPUTS
Each output port can be individually configured as either
differential LVPECL, differential LVDS, or two single-ended
LVCMOS clock outputs. The simplified equivalent circuit of the
LVDS outputs is shown in Figure 36.
3.5mA
OUTxP
OUTxN
09
284
-04
0
Figure 36. LVDS Outputs Simplified Equivalent Circuit
The simplified equivalent circuit of the LVPECL outputs is
shown in Figure 37.
3.3V
OUTxP
OUTxN
GND
092
84-
0
41
Figure 37. LVPECL Outputs Simplified Equivalent Circuit
Output channels (consisting of a VCO divider, output divider, and
an output buffer) can be individually powered down to save power.
Setting PDCH0, PDCH1, PDCH2, and PDCH3 (Register BP0[1:0]
and Register DR1[7:6]) powers down the appropriate channel.
Output buffer combinations of LVDS, LVPECL, and CMOS can be
selected by setting DR1[5:0] as is shown in Table 20 and Table 21.
Table 20. PLL1 Output Driver Format Control Bits,
Register DR1[2:0]
FORMAT1 (PLL1)
Register DR1[2:0]
OUT1P/OUT1N
OUT0P/OUT0N
000
LVPECL
001
LVDS
010
2 × CMOS
LVPECL
011
2 × CMOS
100
2 × CMOS
LVDS
101
LVPECL
LVDS
110
LVPECL
2 × CMOS
2 × CMOS
1 This indicates that the CMOS outputs are in phase; otherwise, they are in
antiphase.
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