Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

ADF4217 Datasheet(PDF) 10 Page - Analog Devices

Part # ADF4217
Description  Dual RF PLL Frequency Synthesizers
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADF4217 Datasheet(HTML) 10 Page - Analog Devices

Back Button ADF4217_15 Datasheet HTML 6Page - Analog Devices ADF4217_15 Datasheet HTML 7Page - Analog Devices ADF4217_15 Datasheet HTML 8Page - Analog Devices ADF4217_15 Datasheet HTML 9Page - Analog Devices ADF4217_15 Datasheet HTML 10Page - Analog Devices ADF4217_15 Datasheet HTML 11Page - Analog Devices ADF4217_15 Datasheet HTML 12Page - Analog Devices ADF4217_15 Datasheet HTML 13Page - Analog Devices ADF4217_15 Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 20 page
background image
REV. 0
ADF4216/ADF4217/ADF4218
–10–
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The reference input stage is shown below in Figure 2. 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.
BUFFER
100k
SW2
NC
NC
SW1
REFIN
SW3
NO
TO
R COUNTER
POWER-DOWN
CONTROL
Figure 2. Reference Input Stage
IF/RF INPUT STAGE
The IF/RF input stage is shown in Figure 3. It is followed by a
2-stage limiting amplifier to generate the CML clock levels
needed for the prescaler.
2k
RFINA
AVDD
BIAS
GENERATOR
2k
RFINB
AGND
Figure 3. IF/RF Input Stage
PRESCALER
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). This prescaler, operating at CML levels, takes
the clock from the IF/RF input stage and divides it down to a
manageable frequency for the CMOS A and B counters. It is
based on a synchronous 4/5 core.
The prescaler is selectable. On the IF side it can be set to
either 8/9 (DB20 of the IF AB Counter Latch set to 0) or 16/17
(DB20 set to 1). On the RF side it can be set to 64/65 (DB20 of
the RF AB Counter Latch set to 0) or 32/33 (DB20 set to 1).
See Tables IV and VI.
A AND B COUNTERS
The A and B CMOS counters combine with the dual modulus
prescaler to allow a wide ranging division ratio in the PLL feed-
back counter. The devices are guaranteed to work when the
prescaler output is 165 MHz or less. Typically they will work
with 200 MHz output from the prescaler.
Pulse Swallow Function
The A and B counters, in conjunction with the dual modulus
prescaler make it possible to generate output frequencies which
are spaced only by the Reference Frequency divided by R. The
equation for the VCO frequency is as follows:
fVCO = [(P
× B) + A] × fREFIN/R
fVCO = Output frequency of external voltage controlled oscilla-
tor (VCO).
P
= Preset modulus of dual modulus prescaler (8/9, 16/17,
etc.).
B
= Preset Divide Ratio of binary 11-bit counter (1 to
2047).
A
= Preset Divide Ratio of binary 6-bit A counter (0 to
63).
fREFIN = Output frequency of the external reference frequency
oscillator.
R
= Preset divide ratio of binary 14-bit programmable
reference counter (1 to 16383).
R COUNTER
The 14-bit R counter allows the input reference frequency to be
divided down to produce the reference clock to the phase fre-
quency detector (PFD). Division ratios from 1 to 16,383 are
allowed.
N = BP+A
PRESCALER
P/P+1
MODULUS
CONTROL
LOAD
LOAD
11-BIT B
COUNTER
6-BIT A
COUNTER
N
DIVIDER
FROM IF/RF
INPUT STAGE
TO PFD
Figure 4. A and B Counters
PHASE FREQUENCY DETECTOR (PFD) AND CHARGE
PUMP
The PFD takes inputs from the R counter and N counter and
produces an output proportional to the phase and frequency
difference between them. Figure 5 is a simplified schematic.
CHARGE
PUMP
U3
CP
DELAY
ELEMENT
D1
Q1
U1
CLR1
UP
HI
IN
D1
Q1
U1
CLR2
DOWN
HI
– IN
Figure 5. PFD Simplified Schematic
OBSOLETE


Similar Part No. - ADF4217_15

ManufacturerPart #DatasheetDescription
logo
Analog Devices
ADF4217BRU AD-ADF4217BRU Datasheet
227Kb / 20P
   Dual RF PLL Frequency Synthesizers
REV. 0
ADF4217L AD-ADF4217L Datasheet
273Kb / 24P
   Dual Low Power Frequency Synthesizers
REV. C
ADF4217L AD-ADF4217L_15 Datasheet
290Kb / 24P
   Dual Low Power Frequency Synthesizers
REV. C
More results

Similar Description - ADF4217_15

ManufacturerPart #DatasheetDescription
logo
Analog Devices
ADF4207 AD-ADF4207_15 Datasheet
226Kb / 20P
   Dual RF PLL Frequency Synthesizers
REV. 0
ADF4206 AD-ADF4206 Datasheet
206Kb / 20P
   Dual RF PLL Frequency Synthesizers
REV. 0
ADF4218 AD-ADF4218 Datasheet
227Kb / 20P
   Dual RF PLL Frequency Synthesizers
REV. 0
ADF4213 AD-ADF4213_15 Datasheet
252Kb / 20P
   Dual RF/IF PLL Frequency Synthesizers
REV. A
ADF4212 AD-ADF4212_15 Datasheet
252Kb / 20P
   Dual RF/IF PLL Frequency Synthesizers
REV. A
ADF4111 AD-ADF4111_15 Datasheet
428Kb / 28P
   RF PLL Frequency Synthesizers
Rev. F
ADF4116 AD-ADF4116_15 Datasheet
486Kb / 28P
   RF PLL Frequency Synthesizers
REV. D
ADF4110 AD-ADF4110 Datasheet
263Kb / 24P
   RF PLL Frequency Synthesizers
REV. 0
ADF4116 AD-ADF4116 Datasheet
226Kb / 20P
   RF PLL Frequency Synthesizers
REV. 0
ADF4110 AD-ADF4110_13 Datasheet
428Kb / 28P
   RF PLL Frequency Synthesizers
Rev. F
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com