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LM565/LM565C Phase Locked Loop

May 1999

LM565/LM565C Phase

Locked Loop

GeneralDescription

The LM565 and LM565C are

general purpose phase lockedloops containing a stable, highly

linear voltage controlled os- cillatorfor lo distortion !M de"odulation,

and a double bal- anced phasedetector ith good carrier

suppression# The $C% fre&uencyis set ith an e'ternal resistor and

capacitor, and a tuning range of1()1 can be obtained ith the

sa"e capacitor# Thecharacteristics of the closed

loop syste" * bandidth,

response speed,

capture and pull in range * "aybe ad+usted over a ide range ith

an e'ternal resistor and capacitor#

The loop "ay be broken beteenthe $C% and the phase detector

for insertion of a digital fre- &uency

divider to obtain fre&uency"ultiplication#

The LM565 is specified foroperation over the 55.C to/105.C "ilitary te"perature range#The LM565C is speci- fied for

operation over the (.C to /2(.Cte"perature range#

Features

n 0(( pp"3.C fre&uencystability of the $C%

n 4oer supply range of 5 to 10volts ith 1(( pp"3

typical

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n (#0 linearity of de"odulated output

n Linear triangle ave ith

in phase 7ero crossings

available

n TTL and 8TL co"patiblephase detector input ands&uare ave output

n d+ustable hold in range fro"

1

to: 5

6(

Applications

n 8ata and tape synchroni7ation

n Mode"s

n !;< de"odulation

n !M de"odulation

n !re&uency synthesi7er

n Tone decoding

n !re&uency "ultiplication and division

n ;C

de"odulator

s n

Tele"etry

receivers n

;ignal

regeneration

n Coherent de"odulators

Connection Diagrams

Metal CanPackage

Dual-in-Line Package

Orderum!erLM565"

#ee # Packageum!er "$%C

8;((2=5>-0

Order um!er

LM565C #ee#

Package um!er

$&A

8;((2=5>->

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? 1999 ational ;e"iconductor Corporation 8;((2=5>#national#co"

This datasheet has been donloaded fro"http)33#digchip#co" at this page

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A!solute Ma'imum (atings@ote 1A

)* Militar+/Aerospace speci*ied

de,ices are reuired. please

contact the ational

#emiconductor #ales O**ice/

Distri!utors *or a,aila!ilit+ and

speci*ications

;upply $oltage510$ 4oer 8issipation @ote 0A

1B(( " 8ifferential Dnput $oltage51$

%perating Te"perature Eange

LM565

55.C to/105.C

LM565C(.C to /2(.C ;torage Te"perature

Eange 65.C to

/15(.C

Lead Te"perature@;oldering, 1( sec#A

06(.C

0lectrical CharacteristicsC Test Circuit, T

F 05.C, $

CC

F 56$

Parameter ConditionsLM5 LM565C

1nitsMi 2+ Ma M 2+ Ma

4oer ;upply Current =# 10# =# 10# "

Dnput D"pedance @4ins 0, >AB$ G $

0

, $>

G ($2 1 5 k

$C% Ma'i"u" %perating

!re&uencyC

o

F 0#2 p! >((

5((

05

5((

k7

$C% !ree-Eunning !re&uency Co

#n

1(

( /1(

>

( />(

%perating !re&uency

Te"perature Coefficient1((

0((

pp"3.C

!re&uency 8rift ith

;upply $oltage(#1

1#(

(#0

1#5

3$

Triangle ave %utput $oltage 0 0# > 0 0# > $

Triangle ave %utput Linearity (# (# ;&uare ave %utput Level B# 5# B# 5# $

%utput D"pedance @4in BA 5 5 k

;&uare ave 8uty Cycle B 5 5 B 5 6

;&uare ave Eise Ti"e 0 0 n

;&uare ave !all Ti"e 5 5 n

%utput Current ;ink @4in BA (# 1 (# 1 "

$C% ;ensitivity

F 66 66 73$

8e"odulated %utput $oltage

@4in 2A

1(

!re&uency

8eviation

05(

>((

B((

0(

>((

B5(

"$

Total ar"onic 8istortion (# (#2 (# 1# %utput D"pedance @4in 2A ># ># k

8C Level @4in 2A B#0 B# B#2 B# B# 5# $

%utput %ffset $oltage

>

(

1(

(

5

(

0(

(

"

$

5( 5( I$3.M Ee+ection > B B d

4hase 8etector ;ensitivity #national#co"

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COFreuenc+as a

Function o*2emperatur

e

8;((2=5>-19

Loop Gain,s Load

(esistance

8;(

(2=5>-0(

"old in(ange as a

Function o*(

689

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#chematic Diagram

8;((2=5>-1

#national#co" B

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AC 2est Circuit

ote3 ;1open for output offset

voltage @$2 $

6A "easure"ent#

2+pical Applications

8;((2=5>-5

4&%% ": #+nchronousAM Demodulator

9#national#co"

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8;((2=5>-6

10#national#co"#national#co"

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2+pical Applications @ContinuedA

F#; Demodulator

-2

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F#; Demodulator ithDC (estoration

8;((2

=5>-=

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2+pical Applications @ContinuedA

Freuenc+

Multiplier

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8;((2=5>-1(

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Applications)n*ormation

Dn designing ith phase lockedloops such as the LM565, the

i"portant para"eters of interestare)

!EKK ED!EKNKCO

L%%4 D) relates the a"ount of

phase change beteen the inputsignal and the $C% signal for a

shift in input signal fre&uency@assu"ing the loop re"ains in

lockA# Dn servo theory, this is calledthe Pvelocity error coefficient#Q

The loop gain of the LM565 is

dependent on supply voltage, and"ay be found fro")

fo

F $C% fre&uency in 7

$c

F total supply voltage to circuit

Loop gain "ay be reduced byconnecting a resistor beteen pins

6 and 2R this reduces the load

i"pedance on the output a"plifierand hence the loop gain#

%L8 D EK) the range offre&uencies that the loop ill

re"ain in lock after initially beinglocked#

fo

F free running fre&uency of $C%

$c

F total supply voltage to the

circuit

2"0LOOP

F)L20(

Dn al"ost all applications, itill be desirable to filter the

sig- nal at the output of thephase detector @pin 2AR this

filter "ay take one of tofor"s)

#imple LeadFilter

8;((2=5>-11

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Lag-Lead Filter

8;((2=5>-10

si"ple lag filter "ay be used for ideclosed loop band- idth applications such

as "odulation folloing here thefre&uency deviation of the carrier is fairly

high @greater than1(A, or here ideband "odulating

signals "ust be fol- loed#

The natural bandidth of the closed loop

response "ay be found fro")

ssociated ith this is ada"ping factor)

!or narro band applications here anarro noise band- idth is desired, suchas applications involving tracking a slolyvarying carrier, a lead lag filter should beused# Dn gen- eral, if 13E

1C

1

G B 16 =(

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