DATA BULLETIN

MX839

© 1998 MX

xCOM Inc.

www.mxcom.com Tele: 800 638-5577 336 744-5050

Fax: 336 744-5054

Doc. # 20480164.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

Digitally Controlled

Analog I/O Processor

PRELIMINARY INFORMATION

Features

Applications

x 4 input intelligent 10 bit A/D monitoring

subsystem

4 High and 4 Low Comparators

External IRQ Generator

Free Running Operation

x Three 8/10 bit DACs

x Two Variable Attenuators

x Selectable A/D Clock Frequencies

x Full Control via 4-wire Serial Interface

x Low Power 3.0 Operation

x PCS, Cellular, LMR, Wireless

Transceivers, and General Purpose

x Monitor and Control:

RSSI, Battery State, Temperature,

VSWR, and Error Voltages

x Digital Trim and Calibration:

VCOs, TCXO, Power Output, Bias,

Current, IF Gain, Deviation,

Modulation Depth, and Baseband

Gain

RSSI

VSWR

TX POWER

REF. OFFSET TRIM

MOD 1 OUT

µC

BATTERY STATE

TEMPERATURE

RECEIVER

RF TRANSMITTER

TRANSMITTER

MODULATOR

RADIO

BATTERY

SYSTEM

MX839

4 x 10 bit Free Run A/D

4 x Hi Comparator

4 x Low Comparator

IRQ on Compare

2 x

Variable

Attenuator

3 x

8/10 bit

DAC

Clock Osc

& Dividers

C-BUS Interface

& Control Logic

VCO TRIM

MOD 1 IN

C-BUS SERIAL BUS 0 : 3

MOD 2 OUT

MOD 2 IN

The MX839 is a low power CMOS µC peripheral device which provides digitally controlled calibration, trimming, and

monitoring functions for PCS, cellular, LMR, wireless transceivers, and general purpose applications.

Featuring a four input intelligent 10 bit A/D monitoring subsystem, an interrupt generator, three 8/10 bit DACs, and two

variable attenuator functions, the MX839 automatically monitors, produces, and trims up to nine analog signals via a

simple four wire serial control bus. The free running A/D intelligent monitoring subsystem includes independent high and

low limit comparators for each of four analog input signals which can be configured to generate external µC interrupts.

The MX839’s high level of integration reduces end product parts count, component size, and software complexity. MX839

digital trimming functions also reduce manufacturing costs by eliminating manual trimming operations.

Featuring an operating range of 3.0V to 5.5V the MX839 is available in 24-pin SSOP (MX839DS), 24-pin SOIC

(MX839DW), and 24-pin PDIP (MX839P) packages.