Overview

The LC72148V is a 3 V version of the LC72146 PLL frequency synthesizer that can easily implement a variety of 3 V power supply tuners, including in-car navigation system receivers based on the VICS FM multiplex system.

Functions

• High-speed programmable divider

— FMIN: 10 to 180 MHz ... Pulse swallower technique

— AMIN: 2 to 40 MHz ... Pulse swallower technique 0.5 to 10 MHz ... Direct division technique

• IF counters

— HCTR: 0.4 to 25 MHz ... Frequency measurement

— LCTR: 10 to 500 kHz ... Frequency measurement

1.0 to 20 × 103 Hz ... Period measurement

• Reference frequency

— One of 12 reference frequencies can be selected (Crystal resonator: 7.2 or 4.5 MHz) 1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 25, 30, 50, and 100 kHz

• Phase comparator

— Provides dead zone control

— Built-in unlock detection circuit

— Built-in deadlock clear circuit

— Sub-charge pump for high-speed locking

• Built-in MOS transistor for implementing an active lowpass filter

• I/O ports: Five general-purpose I/O ports.

— Input: 7 pins (maximum)

— Output: 7 pins (maximum. N-channel: 4 pins, CMOS: 3 pins)

— A clock time base signal (8 Hz) can be output.

• Serial data I/O

— Supports communication with a controller in the CCB format.

— Uses the same serial data as the LC72146.

• Operating ranges

— Supply voltage: 2.7 to 3.6 V

— Operating temperature: –40 to +85°C

• Package

— SSOP24