MC145173

1

MOTOROLA

Advance Information

Dual-Band PLL Frequency

Synthesizer with ADC and

Frequency Counter

CMOS

The MC145173 is a single–chip CMOS synthesizer with a four–wire serial

interface for primary use in AM–FM broadcast receivers. The device also finds

use in long–wave (LW) and short–wave (SW) receivers. Two inputs to a single

high–speed N counter are provided, along with 2 phase detectors; one for a

VHF loop up to 130 MHz, and another for an HF loop up to 40 MHz. The VHF

phase detector has a current source/sink output and both detectors feature

linear transfer functions (no dead zones). An external crystal ties across

on–chip circuitry which drives a completely–programmable reference counter.

Thus, a broad range of tuning resolution is possible. The crystal oscillator is

buffered and fed to an open–drain output which is active in the HF mode only.

Due to the patented BitGrabber

™ registers, address or steering bits are not

needed in the serial data stream for random access of the registers. The serial

port is byte–oriented to facilitate control via an MCU. Tuning across a band is

accomplished with a two–byte transfer to the N register.

The 6–bit analog–to–digital converter (ADC) has two input channels. The

converter is read via a one–byte transfer which includes an end–of–conversion

(EOC) bit.

A 22–stage frequency counter is provided and accepts two IF (intermediate

frequency) signals. Primary use for the frequency counter is for the seek or

scan function on broadcast radio receivers. A proper frequency count ensures

tuning of valid stations on their center frequencies. Reading the count is

accomplished with a three–byte serial transfer which includes a count–com-

plete (CC) bit.

Four general purpose digital outputs are included. One of the outputs is

open–drain; the others are totem–pole (push–pull). Two general purpose digital

inputs are provided also. One input has a comparator with a switch point at 33%

of VDD.

• Operating Voltage Range: 4.5 to 5.5 V

• Maximum Operating Frequency: VHFin = 130 MHz @ 210 mV p–p

HFin = 40 MHz @ 210 mV p–p

• Maximum Frequency of Reference Counter: 15 MHz

• Maximum Frequency of Frequency Counter: 20 MHz

• Maximum Supply Current: Operating Mode = 12 mA

Standby Mode = 30

µA

• Approximate ADC Conversion Time: 360 µs

• Operating Temperature Range: – 40 to + 85°C

• R Counter Division Range: 1 and 5 to 16,383

• N Counter Division Range: 40 to 32,767

• Accommodates Downconversion or Upconversion Receiver Design

for AM Broadcast Band

• Direct Interface to Motorola SPI Data Port

• Programmer’s Guide Included in Datasheet

BitGrabber is a trademark of Motorola, Inc.

This document contains information on a new product. Specifications and information herein are subject to change without notice.

Order this document

by MC145173/D

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

MC145173

OUTPUT B

VHFin

VDD

HF PDout

Rx

14

15

16

17

18

13

12

VHF PDout

OUTPUT D

OUTPUT C

VSS

10

9

8

7

6

5

4

3

VHF IFin

HF IFin

INPUT A

INPUT B

INPUT D

Dout

CLK

Din

11

20

21

22

19

PIN ASSIGNMENT

INPUT C

OUTPUT A

HFin

DW SUFFIX

SOG PACKAGE

CASE 751E

ORDERING INFORMATION

MC145173DW SOG Package

REFout

OSCout

2

1

ENB

OSCin

23

24

24

1

REV 1

3/95