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National Semiconductor Electronic Components Datasheet

LMX1602 Datasheet

PLLatinum Low Cost Dual Frequency Synthesizer

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PRELIMINARY
March 1998
LMX1600/LMX1601/LMX1602
PLLatinumLow Cost Dual Frequency Synthesizer
LMX1600
LMX1601
LMX1602
2.0 GHz/500 MHz
1.1 GHz/500 MHz
1.1 GHz/1.1 GHz
General Description
The LMX1600/01/02 is part of a family of monolithic inte-
grated dual frequency synthesizers designed to be used in a
local oscillator subsystem for a radio transceiver. It is fabri-
cated using National’s 0.5u ABiC V silicon BiCMOS process.
The LMX1600/01/02 contains two dual modulus prescalers,
four programmable counters, two phase detectors and two
selectable gain charge pumps necessary to provide the con-
trol voltage for two external loop filters and VCO loops. Digi-
tal filtered lock detects for both PLLs are included. Data is
transferred into the LMX1600/01/02 via a MICROWIRE
serial interface (Data, Clock, LE).
VCC supply voltage can range from 2.7V to 3.6V. The
LMX1600/01/02 features very low current consumption -
typically 4.0 mA at 3V for LMX1601, 5.0 mA at 3V for
LMX1600 or LMX1602. Powerdown for the PLL is hardware
controlled.
The LMX1600/01/02 is available in a 16 pin TSSOP surface
mount plastic package.
Features
n VCC = 2.7V to 3.6V operation
n Low current consumption:
4 mA @ 3V (typ) for LMX1601
5 mA @ 3V (typ) for LMX1600 or LMX1602
n PLL Powerdown mode: ICC = 1 µA typical
n Dual modulus prescaler:
— 2 GHz/500 MHz option: (Main) 32/33 (Aux) 8/9
— 1.1 GHz/500 MHz option: (Main) 16/17 (Aux) 8/9
— 1.1 GHz/1.1 GHz option: (Main) 16/17 (Aux) 16/17
n Digital Filtered Lock Detects
Applications
n Cordless / Cellular / PCS phones
n Other digital mobile phones
Functional Block Diagram
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
MICROWIREand PLLatinumare trademarks of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100129
DS100129-1
www.national.com


National Semiconductor Electronic Components Datasheet

LMX1602 Datasheet

PLLatinum Low Cost Dual Frequency Synthesizer

No Preview Available !

Connection Diagram
Pin Description
Pin
Pin Name
No.
1 FoLD
I/O
O
2 OSCIN
I
3 OSCOUT
4 GND
5 finAUX
6 VCCAUX
7 CPoAUX
8 ENAUX
9 ENMAIN
10 CPoMAIN
11 VCCMAIN
12 finMAIN
13 GND
14 LE
15 Data
16 Clock
O
I
O
I
I
O
I
I
I
I
DS100129-2
Order Number LMX1600TM, LMX1601TM, or LMX1602TM
NS Package Number MTC16
Description
Multiplexed output of the Main/Aux programmable or reference dividers and Main/Aux lock
detect. CMOS output. (See Programming Description 2.5)
PLL reference input which drives both the Main and Aux R counter inputs. Has about 1.2V
input threshold and can be driven from an external CMOS or TTL logic gate. Typically
connected to a TCXO output. Can be used with an external resonator (See Programming
Description 2.5.4).
Oscillator output. Used with an external resonator.
Aux PLL ground.
Aux prescaler input. Small signal input from the VCO.
Aux PLL power supply voltage input. Must be equal to VCCMAIN. May range from 2.7V to
3.6V. Bypass capacitors should be placed as close as possible to this pin and be
connected directly to the ground plane.
Aux PLL Charge Pump output. Connected to a loop filter for driving the control input of an
external VCO.
Powers down the Aux PLL when LOW (N and R counters, prescaler, and tristates charge
pump output). Bringing ENAUX HIGH powers up the Aux PLL.
Powers down the Main PLL when LOW (N and R counters, prescaler, and tristates charge
pump output). Bringing ENMAIN HIGH powers up the Main PLL.
Main PLL Charge Pump output. Connected to a loop filter for driving the control input of an
external VCO.
Main PLL power supply voltage input. Must be equal to VCCAUX. May range from 2.7V to
3.6V. Bypass capacitors should be placed as close as possible to this pin and be
connected directly to the ground plane.
Main prescaler input. Small signal input from the VCO.
Main PLL ground.
Load enable high impedance CMOS input. Data stored in the shift registers is loaded into
one of the 4 internal latches when LE goes HIGH (control bit dependent).
High impedance CMOS input. Binary serial data input. Data entered MSB first. The last two
bits are the control bits.
High impedance CMOS Clock input. Data for the various counters is clocked in on the
rising edge, into the 18-bit shift register.
www.national.com
2


Part Number LMX1602
Description PLLatinum Low Cost Dual Frequency Synthesizer
Maker National Semiconductor
Total Page 14 Pages
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