CMX979 PLL+VCO Datasheet

CMX979 Datasheet, PDF, Equivalent


Part Number

CMX979

Description

Dual PLL+VCO

Manufacture

CML

Total Page 30 Pages
Datasheet
Download CMX979 Datasheet


CMX979
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX979
Dual PLL + VCO
CMX979 RF Frac-N Synth, IF Integer-N Synth and VCOs
D/979/4 October 2017
DATASHEET
Provisional
Features
RF synthesiser/PLL
Fractional-N 24-bit divider
Output range 338MHz 3.6GHz
Programmable output divider
Fast lock function
Programmable charge pump current
IF synthesiser/PLL
Integer-N 14-bit divider
Output range 31MHz 1GHz
Programmable output divider
-209dBc/Hz normalised phase noise
Integrated low noise LDO regulator
Flexible power saving operating modes
Single 2.7V to 3.6V supply
1.8V digital interface supported
-40° to +85° operating temp. range
Small outline 6mm x 6mm VQFN package
Applications
Satellite modems
Custom ISM band modems
Wireless data links
CATV equipment
General purpose RF use
MCLK
Fractional-N
PLL
Integer-N
PLL
Power Supply
Divide by:
1, 2, 4, 6 or 8
LOOUT
RF Synthesiser
Divide by:
1, 4, 8 or 16
IF Synthesiser
Control Registers
IFPLLOUT
C-BUS
1 Brief Description
The CMX979 is a low-power, wideband, dual synthesiser and VCO, supporting signal generation over a wide range of
frequencies. The ‘RF’ high frequency synthesiser employs a Fractional-N design and will operate at up to 3.6GHz using a
fully-integrated internal VCO. The ‘IF’ synthesiser employs an integer-N design and will operate at up to 1GHz. It has an
integrated VCO requiring only an external inductor to set the fundamental frequency. Internal dividers and buffers are
provided for each synthesiser/PLL allowing a wide range of frequency generation options.
Designed primarily for radio transmitters and receivers using superhetrodyne architectures, the CMX979 provides a
compact solution for frequency generation requiring a minimum of external components. The CMX979 operates from a
single supply voltage and is available in a small 6x6mm VQFN package.
2017 CML Microsystems Plc

CMX979
DUAL PLL + VCO
CMX979
Section
CONTENTS
Page
1
1.1
2
3
3.1
3.1.1
3.1.2
3.1.3
4
4.1
4.2
5
5.1
6
6.1
6.2
6.3
6.3.1
6.3.2
6.3.3
6.3.4
6.4
6.4.1
6.4.2
6.5
6.5.1
6.6
7
7.1
7.1.1
7.2
7.2.1
7.2.2
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
7.3.6
7.3.7
7.3.8
7.3.9
7.3.10
7.3.11
7.3.12
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
7.4.6
7.5
7.5.1
7.5.2
7.5.3
7.5.4
Brief Description....................................................................................................................................................... 1
History ...............................................................................................................................................................................4
Block Diagram .......................................................................................................................................................... 5
Performance Specification........................................................................................................................................ 6
Electrical Performance ......................................................................................................................................................6
Absolute Maximum Ratings ..............................................................................................................................................6
Operating Limits ................................................................................................................................................................6
Operating Characteristics ..................................................................................................................................................7
Pin and Signal Definitions ....................................................................................................................................... 11
Pin List .............................................................................................................................................................................11
Signal Definitions.............................................................................................................................................................12
Power Supply and Decoupling ................................................................................................................................ 13
Layout Recommendations...............................................................................................................................................14
Detailed Description ............................................................................................................................................... 15
Power Management........................................................................................................................................................15
Clock Generator...............................................................................................................................................................15
RF VCO and Fractional-N PLL ...........................................................................................................................................15
RF Fractional-N Synthesiser.............................................................................................................................................15
Register Loading Order....................................................................................................................................................16
Fractional-N Programming Example................................................................................................................................16
RF VCO.............................................................................................................................................................................17
IF PLL and VCO.................................................................................................................................................................19
IF PLL ...............................................................................................................................................................................19
IF VCO..............................................................................................................................................................................20
Local Oscillator (LO).........................................................................................................................................................23
LO Output (LOOUT) .........................................................................................................................................................24
Status and Interrupts.......................................................................................................................................................25
Register Description and C-BUS Interface ............................................................................................................... 26
General Reset Command.................................................................................................................................................27
GEN_RST - $30.................................................................................................................................................................27
General Control Register .................................................................................................................................................27
GCR - $31.........................................................................................................................................................................27
GCR_RD - $C1 ..................................................................................................................................................................27
RF PLL ..............................................................................................................................................................................28
RFPLL_CON - $34 .............................................................................................................................................................28
RFPLL_BLEED - $35 ..........................................................................................................................................................29
RFPLL_LOCKDET - $36......................................................................................................................................................29
RFPLL_FLCK - $37.............................................................................................................................................................30
RFPLL_RDIV - $38 ............................................................................................................................................................31
RFPLL_IDIV - $39..............................................................................................................................................................31
RFPLL_FDIV0 - $3A ..........................................................................................................................................................31
RFPLL_FDIV1 - $3B...........................................................................................................................................................31
RFPLL_RDIV_RD - $C8......................................................................................................................................................32
RFPLL_IDIV_RD - $C9.......................................................................................................................................................32
RFPLL_FDIV0_RD - $CA....................................................................................................................................................32
RFPLL_FDIV1_RD - $CB ....................................................................................................................................................32
IF PLL ...............................................................................................................................................................................32
IFPLL_NDIV - $3C .............................................................................................................................................................32
IFPLL_RDIV - $3D .............................................................................................................................................................33
IFPLL_CURRENT - $3E ......................................................................................................................................................33
IFPLL_NDIV_RD - $CC ......................................................................................................................................................33
IFPLL_RDIV_RD - $CD.......................................................................................................................................................33
IFPLL_CURRENT_RD - $CE................................................................................................................................................33
VCO Calibration ...............................................................................................................................................................34
VCO_CAL_CTRL - $50.......................................................................................................................................................34
VCO_BIAS_CAL_WRITE - $51...........................................................................................................................................34
VCO_BIAS_CAL_TIME - $52 .............................................................................................................................................34
RFVCO_CAL_WRITE - $53 ................................................................................................................................................35
2017 CML Microsystems Plc
2
D/979/4


Features CML Microcircuits COMMUNICATION SEMICOND UCTORS CMX979 Dual PLL + VCO CMX979 R F Frac-N Synth, IF Integer-N Synth and VCOs D/979/4 October 2017 DATASHEET Provisional Features  RF synthesise r/PLL Fractional-N 24-bit divider Outpu t range 338MHz – 3.6GHz Programmable output divider Fast lock function Progr ammable charge pump current  IF synt hesiser/PLL Integer-N 14-bit divider Ou tput range 31MHz – 1GHz Programmable output divider  -209dBc/Hz normalis ed phase noise  Integrated low noise LDO regulator  Flexible power savin g operating modes  Single 2.7V to 3. 6V supply  1.8V digital interface su pported  -40° to +85° operating te mp. range  Small outline 6mm x 6mm V QFN package Applications  Satellite modems  Custom ISM band modems  W ireless data links  CATV equipment General purpose RF use DORF FLCK DO IN MCLK Fractional-N PLL Integer-N PL L Power Supply Divide by: 1, 2, 4, 6 or 8 LOOUT RF Synthesiser Divide by: 1, 4, 8 or 16 IF Synthesiser Control Registers IFPLLOUT .
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