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参数资料
| 型号： | EV-ADF4156SD1Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADF4156 |
| 标准包装： | 1 |
| 主要目的： | 计时，频率合成器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADF4156 |
| 主要属性： | 单路分数-N PLL |
| 次要属性： | 6.2GHz |
| 已供物品： | 板，CD |
ADF4156
Data Sheet
Rev. E | Page 20 of 24
PHASE RESYNC
The output of a fractional-N PLL can settle to any MOD phase
offset with respect to the input reference, where MOD is the
fractional modulus. The phase resync feature in the ADF4156 is
used to produce a consistent output phase offset with respect to
the input reference. This is necessary in applications where the
output phase and frequency are important, such as digital beam
forming. See the Phase Programmability section for information
about how to program a specific RF output phase when using
the phase resync feature.
Phase resync is enabled by setting Bits DB[20:19] in Register R4
to 10. When phase resync is enabled, an internal timer generates
sync signals at intervals of tSYNC as indicated by the following
formula:
tSYNC = CLK_DIV_VALUE × MOD × tPFD
where:
tPFD is the PFD reference period.
CLK_DIV_VALUE is the decimal value programmed in
Bit DB[18:7] of Register R4. This value can be any integer in the
range of 1 to 4095.
MOD is the modulus value programmed in Bit DB[14:3] of
Register R2.
When a new frequency is programmed, the second sync pulse
after the LE rising edge is used to resynchronize the output
phase to the reference. The tSYNC time should be programmed to
a value that is at least as long as the worst-case lock time. Doing
so guarantees that the phase resync occurs after the last cycle
slip in the PLL settling transient.
In the example shown in Figure 24, the PFD reference is
25 MHz and the MOD value is 125 for a 200 kHz channel
spacing. Therefore, tSYNC is set to 400 s by programming
CLK_DIV_VALUE to 80.
LE
PHASE
FREQUENCY
SYNC
(Internal)
–100
0
100
200
1000
300
400
500
600
700
800
900
05863-
016
TIME (s)
PLL SETTLES TO
CORRECT PHASE
AFTER RESYNC
tSYNC
LAST CYCLE SLIP
PLL SETTLES TO
INCORRECT PHASE
Figure 24. Phase Resync Example
Phase Programmability
To program a specific RF output phase, change the phase word
in Register R1. As this word is swept from 0 to MOD, the RF output
phase sweeps over a 360o/MOD range in steps of 360o/MOD.
LOW FREQUENCY APPLICATIONS
The specification on the RF input is 0.5 GHz minimum; however,
lower RF frequencies can be used if the minimum slew rate
specification of 400 V/s is met. An appropriate LVDS driver, such
as the FIN1001 from Fairchild Semiconductor, can be used to
square up the RF signal before it is fed back into the ADF4156
RF input.
FILTER DESIGN—ADIsimPLL
A filter design and analysis program is available to help implement
the PLL design. Visit www.analog.com/pll for a free download
of the ADIsimPLL software. This software designs, simulates,
and analyzes the entire PLL frequency domain and time domain
response. Various passive and active filter architectures are allowed.
When designing the loop filter, keep the ratio of the PFD frequency
to the loop bandwidth >200:1 to attenuate the Σ-Δ modulator noise.
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| EV-ADF4157SD1Z | 功能描述:BOARD EVAL FOR ADF4157 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:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| EV-ADF4159EB1Z | 制造商:Analog Devices 功能描述:EVALUATION BOARD - Boxed Product (Development Kits) 制造商:Analog Devices 功能描述:EVAL BOARD FOR ADF4159 |
| EV-ADF4159EB2Z | 制造商:Analog Devices 功能描述:13GHZFRAC-NPLL+ADF55XXVCO+3VADM - Boxed Product (Development Kits) |
| EV-ADF4159EB3Z | 制造商:Analog Devices 功能描述:EVALUATIONBOARD - Boxed Product (Development Kits) 制造商:Analog Devices 功能描述:EVAL BOARD FOR ADF4159 制造商:Analog Devices 功能描述:Clock & Timer Development Tools ADF4159 EVAL BRD |
| EV-ADF4360-0EB1Z | 功能描述:BOARD EVAL FOR ADF4360-0 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:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
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