LMX2335TM National Semiconductor, LMX2335TM Datasheet

no-image

LMX2335TM

Manufacturer Part Number
LMX2335TM
Description
IC FREQ SYNTHESIZER DUAL 16TSSOP
Manufacturer
National Semiconductor
Series
PLLatinum™r
Type
PLL Frequency Synthesizerr
Datasheet

Specifications of LMX2335TM

Pll
Yes with Bypass
Input
CMOS, TTL
Output
CMOS
Number Of Circuits
1
Ratio - Input:output
3:1
Differential - Input:output
No/No
Frequency - Max
1.1GHz
Divider/multiplier
Yes/No
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP
Frequency-max
1.1GHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LMX2335TM

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LMX2335TMB
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LMX2335TMC
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LMX2335TMX/NOPB
Manufacturer:
NS
Quantity:
12 032
© 2000 National Semiconductor Corporation
LMX2335/LMX2336/LMX2337
PLLatinum
Personal Communications
LMX2335
LMX2336
LMX2337
General Description
The LMX2335, LMX2336 and LMX2337 are monolithic, inte-
grated dual frequency synthesizers, including two high fre-
quency prescalers, and are designed for applications requir-
ing two RF phase-lock loops. They are fabricated using
National’s ABiC IV silicon BiCMOS process.
The LMX2335/36/37 contains two dual modulus prescalers.
A 64/65 or a 128/129 prescaler can be selected for each RF
synthesizer. A second reference divider chain is included in
the IC for improved system noise. LMX2335/36/37, which
employ a digital phase locked loop technique, combined with
a high quality reference oscillator and loop filters, provide the
tuning voltages for voltage controlled oscillators to generate
very stable low noise RF local oscillator signals.
Serial data is transferred into the LMX2335/36/37 via a three
wire interface (Data, Enable, Clock). Supply voltage can
range from 2.7V to 5.5V. The LMX2335/36/37 feature very
low current consumption; LMX2335/37 −10 mA at 3V,
LMX2336 −13 mA at 3V. The LMX2335/37 are available in
Functional Block Diagram
TRI-STATE
Fastlock
, MICROWIRE
®
is a registered trademark of National Semiconductor Corporation.
and PLLatinum
1.1 GHz/1.1 GHz
2.0 GHz/1.1 GHz
550 MHz/550 MHz
Dual Frequency Synthesizer for RF
are trademarks of National Semiconductor Corporation.
DS012332
both a JEDEC SO and TSSOP 16-pin surface mount plastic
package. The LMX2336 is available in a TSSOP 20-pin sur-
face mount plastic package.
Features
n 2.7V to 5.5V operation
n Low current consumption
n Selectable powerdown mode:
n Dual modulus prescaler: 64/65 or 128/129
n Selectable charge pump TRI-STATE
n Selectable charge pump current levels
n Selectable FastLock
Applications
n Cellular telephone systems (AMPS, ETACS, RCR-27)
n Cordless telephone systems (DECT, ISM, PHS, CT-1+)
n Personal Communication Systems
n Dual Mode PCS phones
n CATV
n Other wireless communication systems
I
(DCS-1800, PCN-1900)
CC
= 1 µA (typ)
mode
®
mode
DS012332-1
September 1996
www.national.com

Related parts for LMX2335TM

LMX2335TM Summary of contents

Page 1

... Enable, Clock). Supply voltage can range from 2.7V to 5.5V. The LMX2335/36/37 feature very low current consumption; LMX2335/37 − 3V, LMX2336 − 3V. The LMX2335/37 are available in Functional Block Diagram TRI-STATE ® registered trademark of National Semiconductor Corporation. Fastlock ™ , MICROWIRE ™ and PLLatinum ™ ...

Page 2

... Connection Diagrams LMX2335/LMX2337 Order Number LMX2335M/LMX2335TM or LMX2337M/LMX2337TM NS Package Number M16A and MTC16 Pin Descriptions Pin No. Pin No. Pin I/O 2335/37 2336 Name GND GND 6 8 OSC OSC O out Clock Data GND GND www.national.com DS012332-2 Power supply voltage input for RF1 analog and RF1 digital circuits. Input may range from 2 ...

Page 3

Pin Descriptions (Continued) Pin No. Pin No. Pin I/O 2335/37 2336 Name Block Diagram Note supplies power to the RF1 prescaler, N-counter, R-counter, and phase detector detector, R-counter along with the ...

Page 4

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Supply Voltage Voltage on Any Pin with GND = Storage Temperature Range ( Electrical Characteristics V = 5.0V 5.0V 25˚C, except as specified Symbol Parameter I Power Supply ...

Page 5

Electrical Characteristics V = 5.0V 5.0V 25˚C, except as specified Symbol Parameter I Charge Pump LMX2335 D o -TRI TRI-STATE LMX2336 CURRENT I Charge Pump LMX2337 D o -TRI TRI-STATE CURRENT V High-Level ...

Page 6

Typical Performance Characteristics Charge Pump Current vs D Voltage HIGH CP LMX2335/37 Input Impedance (for SO package 2.7V to 5.5V MHz to 1.5 GHz CC IN Marker GHz, Real ...

Page 7

Typical Performance Characteristics I TRI-STATE Voltage o LMX2335/37 RF2 Sensitivity vs Frequency LMX2336 RF2 Sensitivity vs Frequency (Continued) LMX2335/37 RF1 Sensitivity vs Frequency DS012332-25 LMX2336 RF1 Sensitivity vs Frequency DS012332-27 Oscillator Input Sensitivity vs Frequency DS012332-29 7 ...

Page 8

Functional Description The simplified block diagram below shows the 22-bit data register, two 15-bit R Counters and two 18-bit N Counters (intermediate latches are not shown). The data stream is clocked (on the rising edge of Clock) into the DATA ...

Page 9

Functional Description PROGRAMMABLE DIVIDER (N COUNTER) Each N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter). If the Control Bits are (10 for RF2 counter and 11 for RF1 ...

Page 10

Functional Description Phase Detector Polarity (Note 7) 0 Negative 1 Positive Note 5: The I LOW current state = 1 Note 6: Activation of the RF2 PLL or RF1 PLL ...

Page 11

Functional Description Note 9: When the F LD output is disabled it is actively pulled to a low logic state. o Note 10: Lock detect output provided to indicate when the VCO frequency is in “lock”. When the loop is ...

Page 12

Typical Application Example Operational Notes: * VCO is assumed AC coupled increases impedance so that VCO output power is provided to the load rather than the PLL. Typical values are 200 depending on the VCO ...

Page 13

Application Information Loop Gain Equations A linear control system model of the phase feedback for a PLL in the locked state is shown in Figure 2 . The open loop gain is the product of the phase comparator gain (K ...

Page 14

Application Information www.national.com (Continued) FIGURE 4. Open Loop Response Bode Plot FIGURE 5. Fastlock PLL Architecture 14 DS012332-15 DS012332-18 ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted JEDEC 16-Lead (0.150" Wide) Small Outline Molded Package (M) Order Number LMX2335M or LMX2337M * For Tape and Reel (2500 Units Per Reel) Order Number LMX2335MX or LMX2337MX NS Package Number M16A 15 ...

Page 16

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) 16-Lead Thin Shrink Small Outline Package (TM) Order Number LMX2335TM or LMX2337TM * For Tape and Reel (2500 Units Per Reel) Order Number LMX2335TMX or LMX2337TMX NS Package Number MTC16 16 ...

Page 17

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

Related keywords