- 您现在的位置：买卖IC网 > PDF目录16562 > EV-ADF4360-7EB1Z (Analog Devices Inc)BOARD EVAL FOR ADF4360-7 PDF资料下载
参数资料
| 型号： | EV-ADF4360-7EB1Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADF4360-7 |
| 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： | ADF4360-7 |
| 主要属性： | 带 VCO 的单路整数-N PLL |
| 次要属性： | 900MHz，200kHz PFD |
| 已供物品： | 板，缆线，CD |
第1页当前第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
ADF4360-7
Data Sheet
Rev. D | Page 10 of 28
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The reference input stage is shown in Figure 16. SW1 and SW2
are normally closed switches. SW3 is normally open. When
power-down is initiated, SW3 is closed, and SW1 and SW2 are
opened. This ensures that there is no loading of the REFIN pin
on power-down.
04441-016
BUFFER
TO R COUNTER
REFIN
100k
NC
SW2
SW3
NO
NC
SW1
POWER-DOWN
CONTROL
Figure 16. Reference Input Stage
PRESCALER (P/P + 1)
The dual-modulus prescaler (P/P + 1), along with the A and B
counters, enables the large division ratio, N, to be realized
(N = BP + A). The dual-modulus prescaler, operating at CML
levels, takes the clock from the VCO and divides it down to a
manageable frequency for the CMOS A and B counters. The
prescaler is programmable. It can be set in software to 8/9,
16/17, or 32/33 and is based on a synchronous 4/5 core. There is
a minimum divide ratio possible for fully contiguous output
frequencies; this minimum is determined by P, the prescaler
value, and is given by (P2 P).
A AND B COUNTERS
The A and B CMOS counters combine with the dual-modulus
prescaler to allow a wide range division ratio in the PLL feed-
back counter. The counters are specified to work when the
prescaler output is 300 MHz or less. Thus, with a VCO
frequency of 2.5 GHz, a prescaler value of 16/17 is valid, but a
value of 8/9 is not valid. At fundamental VCO frequencies less
than 700 MHz, a value of 8/9 is best.
Pulse Swallow Function
The A and B counters, in conjunction with the dual-modulus
prescaler, make it possible to generate output frequencies that
are spaced only by the reference frequency divided by R. The
VCO frequency equation is
R
f
A
B
P
f
REFIN
VCO
/
]
[
where:
fVCO
is the output frequency of the VCO.
P
is the preset modulus of the dual-modulus prescaler
(8/9 or 16/17).
B
is the preset divide ratio of the binary 13-bit counter (3 to 8191).
A
is the preset divide ratio of the binary 5-bit swallow counter (0 to 31).
fREFIN
is the external reference frequency oscillator.
N = BP + A
TO PFD
FROM VCO
N DIVIDER
MODULUS
CONTROL
LOAD
13-BIT B
COUNTER
5-BIT A
COUNTER
PRESCALER
P/P+1
04441-017
Figure 17. A and B Counters
R COUNTER
The 14-bit R counter allows the input reference frequency to
be divided down to produce the reference clock to the phase
frequency detector (PFD). Division ratios from 1 to 16,383 are
allowed.
PFD AND CHARGE PUMP
The PFD takes inputs from the R counter and N counter
(N = BP + A) and produces an output proportional to the phase
and frequency difference between them. Figure 18 is a simpli-
fied schematic. The PFD includes a programmable delay ele-
ment that controls the width of the antibacklash pulse. This
pulse ensures that there is no dead zone in the PFD transfer
function and minimizes phase noise and reference spurs. Two
bits in the R counter latch, ABP2 and ABP1, control the width
of the pulse (see Table 9).
04441-
018
PROGRAMMABLE
DELAY
U3
CLR2
Q2
D2
U2
CLR1
Q1
D1
CHARGE
PUMP
DOWN
UP
HI
U1
ABP1
ABP2
R DIVIDER
N DIVIDER
CP OUTPUT
R DIVIDER
N DIVIDER
CP
CPGND
VP
Figure 18. PFD Simplified Schematic and Timing (In Lock)
相关PDF资料 |
PDF描述 |
|---|---|
| RCC15DRTF | CONN EDGECARD 30POS DIP .100 SLD |
| RSA06DRMH-S288 | CONN EDGECARD 12POS .125 EXTEND |
| SLF7055T-1R5N4R0-3PF | INDUCTOR POWER 1.5UH 4.0A SMD |
| RCC18DRAN | CONN EDGECARD 36POS R/A .100 SLD |
| RMA06DRMH-S288 | CONN EDGECARD 12POS .125 EXTEND |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EV-ADF4360-8EB1Z | 功能描述:BOARD EVALUATION FOR ADF4360-8 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-ADF4360-9EB1Z | 功能描述:BOARD EVAL FOR ADF4360-9 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-ADF4602EB3ZTST | 制造商:Analog Devices 功能描述:BASEBAND ADAPTER BOARD - Boxed Product (Development Kits) |
| EV-ADUCRF101MK1Z | 制造商:Analog Devices 功能描述:EVALUATION BOARD WITH USB - Boxed Product (Development Kits) |
| EV-ADUCRF101MK1ZU1 | 制造商:Analog Devices 功能描述:DEVELOPMENT TOOL - Boxed Product (Development Kits) |
发布紧急采购，3分钟左右您将得到回复。