ACE9020 is a VHF oscillator, up-converter and prescaler.

It is used in an offset modulated transmit architecture where a

UHF synthesiser makes the channel selection and a second

synthesiser generates a fixed transmit offset.

A VCO signal drives a buffer in ACE9020 to feed an on-

chip prescaler and transmit up-converter. The prescaler is a

dual two-modulus divider and drives the main synthesiser

input of the ACE9030. The SSB up-converter suppresses the

unwanted transmit sideband.

The VHF oscillator is buffered to drive the auxiliary

synthesiser input of the ACE9030 and is locked to the offset

frequency. This frequency is modulated by varying the

resonant frequency of the external tank circuit. Both this

oscillator and the UHF VCO drive the up-converting mixer to

generate the transmit signal.

Various power saving modes for battery economy are

included. These allow the transmit sections to be shut down

during stand-by and the whole chip can be shut down during

sleep mode. The circuit techniques used have been chosen to

minimise external components and at the same time give very

high performance.

Fig.1 Pin connections - top view

FEATURES

s Low Power Low Voltage (3.6 to 5.0 V) Operation

s Power Down Modes

s Differential Signals to Minimise Cross-talk

s Auxiliary Oscillator with Transmit Up-converter

s Prescaler for Main Synthesiser

s Part of the ACE Integrated Cellular Phone Chipset

s Small Outline 28 pin Package

APPLICATIONS

s AMPS and TACS Cellular Telephone

s Two-Way Radio Systems

ORDERING INFORMATION

SSOP 28 lead package, code NP28

ACE9020B/KG/NP1S - anti-static sticks

ACE9020B/KG/NP1T - tape mounted

RELATED PRODUCTS

ACE9020 is part of the following chipset:

s ACE9030 Radio Interface and Twin Synthesiser

s ACE9040 Audio Processor

s ACE9050 System Controller and Data Modem

ABSOLUTE MAXIMUM RATINGS

Supply voltage

6V

Storage temperature

- 65

°Cto+150°C

Operating temperature

- 30

°Cto+85°C

Voltage at any pin

-0.3V to V

Static Sensitivity (HBM) min

500V

VHF

OSC

RSET_TXPA

TANK+

TANK-

TXOSC+

TXOSC-

TXPA+

TXPA-

BIAS &

POWER

DOWN

CONTROL

BIAS_REF

PD1

PD2

RXVCOIN

DIV_OUT+

DIV_OUT-

RATIO_SEL

MOD_CNTRL

DIVIDE BY

64/65 OR 128/129

PD1

PD2

GND

BIAS_REF

VCC_TX

TXPA+

TXPA-

RSET_TXPA

GND_TXOSC

TANK+

TANK-

VCC_DIV

GND_OSC

MOD_CNTRL

DIV_OUT+

DIV_OUT-

RATIO_SEL

GND_DIV

TXOSC+

TXOSC-

VCC_TXOSC

GND_RX

RXVCOIN

n.c.

VCC_RX

n.c.

n.c.

VCC

128

14

15

Note: Pin 1 is identified by moulded spot

and by coding orientation.

NP28

Fig. 2 ACE9020 simplified block digram

ACE9020

Receiver and Transmitter Interface

Supersedes February 1997 edition, DS4287 - 4.1

DS4287 - 5.0 December 1997