CML Semiconductor Products

Analogue Control Interface

FX839

© 1997 Consumer Microcircuits Limited

D/839/4 September 1997

1.0

Features

Advance Information

• Three DACs

8 or 10-Bit Resolution

• Multiplexed 4 Input ADC

10-Bit Resolution

• Custom IRQ Generator with Variable

8-Bit Reference Settings

• Scalable ADC Clock Frequencies

from Xtal/Clock

• Two Variable Attenuators

• Serial Interface to Host µC

• Low Power (3.0V Operation)

• 24-Pin SSOP Package

1.1

Brief Description

This product comprises a selection of independent functional blocks vital to modern microcomputer controlled

radio-frequency communications equipment. Examples of possible uses are as follows:

•

The four-way multiplexed ADC with magnitude comparator may be used for monitoring RSSI, battery

voltage, temperatures, reflected signals or error voltages.

•

The three DACs may be used to adjust VCOs, reference oscillators, power output, bias current or IF gain.

•

The two variable attenuators may be used to adjust deviation, modulation depth or baseband gain.

The FX839 is controlled via the standard serial 'C-BUS'. This is complementary to, and compatible with, many

standard microcomputers and other baseband processing blocks.