Overview

The LC72147V is a PLL frequency synthesizer for car audio systems. It can implement high-performance multifunction tuners and features a crystal oscillator circuit that supports AM up-conversion, a fast locking circuit, an A/D converter, and an LA1783/1750 IF counter buffer control pin.

unctions

• High-speed programmable divider

— FMIN: 10 to 180 MHz: Pulse swallower type

• IF counter

— HCTR: 0.4 to 25 MHz: Frequency measurement

• Crystal oscillator: One of the following 4 frequencies

may be selected: 10.35, 10.25, 7.2, and 4.5 MHz

Reference frequency

— One of 12 frequencies may be selected (when a 7.2

or 4.5 MHz crystal is used)

100*1, 50, 30*2, 25, 12.5, 6.25, 3.125, 10, 9*2, 5, 3*2,

1 kHz

Notes: 1. Cannot be used when a 10.35 or 10.25 MHz

crystal is used

2. Cannot be used when a 10.25 MHz crystal

is used

• Phase comparator

— Supports dead band control

— Built-in unlock detection circuit

— Sub-charge pump for fast locking

— Built-in deadlock clearing circuit

• Built-in MOS transistor for forming an active low-pass

filter

• I/O ports — General-purpose I/O: 5 pins

— Output: n-channel: 3 pins, CMOS: 2 pins

— IFBC pin (LA1783/1750 IF counter buffer control

pin)

• Serial data I/O

— Supports communication with the controller in the

CCB format.

• Operating ranges

— Supply voltage (VDD): 4.5 to 6.5 V

— Built-in regulator voltage (Vreg): 3.0 V (±10)

— Operating temperature: –40 to +85°C

• Package

— SSOP-24