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参数资料
| 型号： | AD9520-0BCPZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 40/80页 |
| 文件大小： | 0K |
| 描述： | IC CLOCK GEN 2.8GHZ VCO 64LFCSP |
| 设计资源： | Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121) Phase Coherent FSK Modulator (CN0186) |
| 标准包装： | 750 |
| 类型： | 时钟发生器，扇出配送 |
| PLL： | 是 |
| 输入： | CMOS，LVDS，LVPECL |
| 输出： | CMOS，LVPECL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 2:12，2:24 |
| 差分 - 输入:输出： | 是/是 |
| 频率 - 最大： | 2.95GHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 3.135 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) |
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Data Sheet
AD9520-0
Rev. A | Page 45 of 80
The channel dividers feeding the output drivers contain one
2-to-32 frequency divider. This divider provides for division-by-1
to division-by-32. Division-by-1 is accomplished by bypassing the
divider. The dividers also provide for a programmable duty cycle,
with optional duty-cycle correction when the divide ratio is odd.
A phase offset or delay in increments of the input clock cycle is
selectable. The channel dividers operate with a signal of up to
1600 MHz at their inputs across all channel divider ratios. The
features and settings of the dividers are selected by programming
the appropriate setup and control registers (see Table 50 through
VCO Divider
The VCO divider provides frequency division between the internal
VCO or the external CLK input and the clock distribution channel
dividers. The VCO divider can be set to divide by 1, 2, 3, 4, 5, or 6
(see Register 0x1E0[2:0]). However, when the VCO divider is
set to 1, none of the channel output dividers can be bypassed.
The VCO divider can also be set to static, which is useful for
applications where the only desired output frequency is the VCO
frequency. Making the VCO divider static increases the wide
band spurious-free dynamic range (SFDR). If the VCO divider
is static during VCO calibration, there is no output signal.
Therefore, it is important to calibrate the VCO with the VCO
divider set to a nonstatic value during VCO calibration, and then
set the VCO divider to static when VCO calibration is complete.
The recommended alternative to achieving the same SFDR
performance is to set the VCO divider to 1 and enable VCO direct
mode. This allows the user to program the EEPROM with the
desired values and does not require further action after the VCO
calibration is complete.
Channel Dividers
A channel divider drives each group of three LVPECL outputs.
There are four channel dividers (0, 1, 2, and 3) driving 12 LVPECL
outputs (OUT0 to OUT11). Table 35 lists the bit locations used for
setting the division and other functions of these dividers. The
division is set by the M and N values. The divider can be bypassed
(equivalent to divide-by-1, divider circuit is powered down) by
setting the bypass bit. The duty-cycle correction can be enabled or
disabled according to the setting of the disable Divider x DCC bits.
Table 35. Setting DX for the Output Dividers
Divider
Low Cycles,
MValue Bits
High Cycles,
N Value Bits
Bypass
Bits
Disable
Divider x
DCC Bits
0
0x190[7:4]
0x190[3:0]
0x191[7]
0x192[0]
1
0x193[7:4]
0x193[3:0]
0x194[7]
0x195[0]
2
0x196[7:4]
0x196[3:0]
0x197[7]
0x198[0]
3
0x199[7:4]
0x199[3:0]
0x19A[7]
0x19B[0]
Channel Divider Maximum Frequency
The maximum frequency at which all features of the channel
divider are guaranteed to work is 1.6 GHz; this is the number that
appears elsewhere in the datasheet. The maximum frequency at
which all features of the channel divider are guaranteed to work
is 1.6 GHz; this is the number that appears elsewhere in the data
sheet. However, if the divide-by-3 and divide-by-17 settings are
avoided, the maximum channel divider input frequency is 2 GHz.
Channel Frequency Division (0, 1, 2, or 3)
For each channel (where the channel number (x) is 0, 1, 2, or 3),
the frequency division, DX, is set by the values of M and N
(four bits each, representing Decimal 0 to Decimal 15), where
Number of Low Cycles = M + 1
Number of High Cycles = N + 1
The high and low cycles are the cycles of the clock signal that
are currently routed to the input of the channel dividers (VCO
divider out or CLK).
When a divider is bypassed, DX = 1.
Otherwise, DX = (N + 1) + (M + 1) = N + M + 2. This allows
each channel divider to divide by any integer from 2 to 32.
Duty Cycle and Duty-Cycle Correction
The duty cycle of the clock signal at the output of a channel is
a result of some or all of the following conditions:
M and N values for the channel
DCC enabled/disabled
VCO divider enabled/bypassed
CLK input duty cycle (note that the internal VCO has a
50% duty cycle)
The DCC function is enabled, by default, for each channel divider.
However, the DCC function can be disabled individually for
each channel divider by setting the disable Divider x DCC bit
for that channel.
Certain M and N values for a channel divider result in a non-
50% duty cycle. A non-50% duty cycle can also result in an
even division, if M ≠ N. The duty-cycle correction function
automatically corrects non-50% duty cycles at the channel
divider output to 50% duty cycle.
Duty-cycle correction requires the following channel divider
conditions:
An even division must be set as M = N.
An odd division must be set as M = N + 1.
When not bypassed or corrected by the DCC function, the duty
cycle of each channel divider output is the numerical value of
(N + 1)/(N + M + 2), expressed as a percent.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9520-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:12 LVPECL/24 CMOS Output Clock Generator with Integrated 2.5 GHz VCO |
| AD9520-1/PCBZ | 功能描述:BOARD EVAL FOR AD9520-1 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
| AD9520-1BCPZ | 功能描述:IC CLOCK GEN 2.5GHZ VCO 64LFCSP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:2,000 系列:- 类型:PLL 时钟发生器 PLL:带旁路 输入:LVCMOS，LVPECL 输出:LVCMOS 电路数:1 比率 - 输入:输出:2:11 差分 - 输入:输出:是/无 频率 - 最大:240MHz 除法器/乘法器:是/无 电源电压:3.135 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:32-LQFP 供应商设备封装:32-TQFP（7x7） 包装:带卷 (TR) |
| AD9520-1BCPZ-REEL7 | 功能描述:IC CLOCK GEN 2.5GHZ VCO 64LFCSP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:2,000 系列:- 类型:PLL 时钟发生器 PLL:带旁路 输入:LVCMOS，LVPECL 输出:LVCMOS 电路数:1 比率 - 输入:输出:2:11 差分 - 输入:输出:是/无 频率 - 最大:240MHz 除法器/乘法器:是/无 电源电压:3.135 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:32-LQFP 供应商设备封装:32-TQFP（7x7） 包装:带卷 (TR) |
| AD9520-2 | 制造商:AD 制造商全称:Analog Devices 功能描述:12 LVPECL/24 CMOS Output Clock Generator with Integrated 2.2 GHz VCO |
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