MC145151–2 through MC145158–2

MOTOROLA

16

TYPICAL APPLICATIONS

Figure 1. AM/FM Radio Broadcast Synthesizer

SW2

SW1

φV

φR

PDout

MC

fin

ENB

DATA

CLK

REFout

VSS

VDD

LD

RA0

RA1

RA2

OSCin

OSCout

NOTES 1

AND 2

OPTIONAL

LOOP

ERROR SIGNAL

MC12019

÷ 20/21 DUAL MODULUS PRESCALER

VCO

AM B +

+ 12 V

FM B +

+ 12 V

LOCK DETECT SIGNAL

TO DISPLAY DRIVER (e.g., MC14489)

CMOS MPU/MCU

KEY–

BOARD

+ V

3.2 MHz

MC145156–2

1/2 MC1458

NOTE 3

+

–

NOTES:

1. For AM: channel spacing = 5 kHz,

÷ R = ÷ 640 (code 100).

2. For FM: channel spacing = 25 kHz,

÷ R = ÷ 128 (code 010).

3. The

φR and φV outputs are fed to an external combiner/loop filter. See the Phase–Locked Loop — Low–Pass Filter Design page

for additional information. The

φR and φV outputs swing rail–to–rail. Therefore, the user should be careful not to exceed the

common mode input range of the op amp used in the combiner/loop filter.

Figure 2. Avionics Navigation or Communication Synthesizer

NAV = 01

COM = 10

CHANNEL

SELECTION

VCO

LOCK DETECT SIGNAL

TO DISPLAY DRIVER

(e.g., MC14489)

CMOS MPU/MCU

+ V

3.2 MHz (NOTE 3)

MC145156–2

MC33171

NOTE 5

SW2

SW1

φV

φR

PDout

MC

fin

ENB

DATA

CLK

REFout

VSS

VDD

LD

RA0

RA1

RA2

OSCin OSCout

MC12016 (NOTES 2 AND 4)

÷ 40/41 DUAL MODULUS PRESCALER

+

–

VCO RANGE

NAV: 97.300 – 107.250 MHz

COM–T: 118.000 – 135.975 MHz

COM–R: 139.400 – 157.375 MHz

R/T

NOTES:

1. For NAV: fR = 50 kHz, ÷ R = 64 using 10.7 MHz lowside injection, Ntotal = 1946 – 2145.

For COM–T: fR = 25 kHz, ÷ R = 128, Ntotal = 4720 – 5439.

For COM–R: fR = 25 kHz, ÷ R = 128, using 21.4 MHz highside injection, Ntotal = 5576 – 6295.

2. A

÷ 32/33 dual modulus approach is provided by substituting an MC12015 for the MC12016. The devices are pin equivalent.

3. A 6.4 MHz oscillator crystal can be used by selecting

÷ R = 128 (code 010) for NAV and ÷ R = 256 (code 011) for COM.

4. MC12013 + MC10131 combination may also be used to form the

÷ 40/41 prescaler.

5. The

φR and φV outputs are fed to an external combiner/loop filter. See the Phase–Locked Loop — Low–Pass Filter Design

page for additional information. The

φR and φV outputs swing rail–to–rail. Therefore, the user should be careful not to exceed

the common mode input range of the op amp used in the combiner/loop filter.

MC145156–2 Data Sheet Continued on Page 23