Overview

The LC72121 and the LC72121M and the LC72121V are

high input sensitivity (20 mVrms at 130 MHz) PLL

frequency synthesizers for 3 V systems. These ICs are

serial data (CCB) compatible with the LC72131, and

feature the improved input sensitivity and lower spurious

radiation (provided by a redesigned ground system)

required in high-performance AM/FM tuners.

Functions

• High-speed programmable divider

— FMIN: 10 to 160 MHz ... Pulse swallower technique

(With built-in divide-by-2

prescaler)

— AMIN: 2 to 40 MHz ... Pulse swallower technique

0.5 to 10 MHz ... Direct division technique

• IF counter

— IFIN: 0.4 to 12 MHz ... For AM and FM IF counting

• Reference frequency

— One of 12 reference frequencies can be selected

(using a 4.5 or 7.2 MHz crystal element)

1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 15, 25, 50, or 100

kHz

• Phase comparator

— Supports dead zone control.

— Built-in unlocked state detection circuit

— Built-in deadlock clear circuit

• An MOS transistor for an active low-pass filter is built

in.

• I/O ports

— Output-only ports: 4 pins

— I/O ports: 2 pins

— Supports the output of a clock time base signal.

• Operating ranges

— Supply voltage: 2.7 to 3.6 V

— Operating temperature: – 40 to 85°C

• Package

— DIP22S, MFP24S, SSOP24

• Comparison with the LC72131/M

— Serial data compatible (CCB)

— Identical pin functions

inserted as the DIP22S NC pins.)

— The MFP product provides a modified pin

assignment (The MFP20 package was replaced by

— The SSOP24 is a newly developed package that has

the same pin assignment as the MFP24S product.

CMOS IC

70398RM (OT) No. 5815-1/22

Preliminary

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

PLL Frequency Synthesizers for Electronic Tuning

LC72121, 72121M, 72121V

Ordering number : EN*5815A

• CCB is a trademark of SANYO ELECTRIC CO., LTD.

• CCB is SANYO’s original bus format and all the bus

addresses are controlled by SANYO.