ACE9030 is a combined radio interface circuit and twin synthesiser, intended for use in a cellular telephone.

The radio interface section contains circuits to monitor and control levels such as transmit power in the telephone, circuits to demodulate the frequency modulated signal to audio, and a crystal oscillator with a frequency multiplier.

The Main synthesiser has normal and fractional-N modes both with optional speed-up to select the desired channel. The Auxiliary synthesiser is used for the transmit-receive offset and for modulation.

Both sections are controlled by a serial bus and have software selected power saving modes for battery economy. The circuit techniques used have been chosen to minimise external components and at the same time give very high performance.

FEATURES

■ Low Power Low Voltage (3·6 to 5·0 V) Operation

■ Serial Bus Controlled Power Down Modes

■ Simple Programming Format

■ Reference Crystal Oscillator

■ Frequency Multiplier for LO2 Signal

■ 8·064 MHz Output for External Microcontroller

■ Main Synthesiser with Fractional-N Option

■ Auxiliary Synthesiser

■ Main Synthesiser Speed-up Options

■ FM Discriminator for 450 kHz or 455 kHz I.F. Signal

■ Radio System Control Interface

■ Part of the ACE Integrated Cellular Phone Chipset

■ TQFP 64 pin 0·4 mm and 0·5 mm pitch packages

APPLICATIONS

■ AMPS and TACS Cellular Telephone

■ Two-way Radio Systems