________________General Description

The MAX1007 is a multifunctional integrated circuit

designed for high-performance mobile radios. It

includes one 8-bit analog-to-digital converter (ADC),

and two 7-bit and two 6-bit digital-to-analog converters

(DACs) for functions including radio-frequency (RF)

power sensing and antenna-diversity selection.

The ADC provides for power sense, receive-signal

strength intensity (RSSI) measurements and system

supervision. In the power-sense mode, the ADC con-

verts the power-sensing circuitry signal (representing

either the transmitted (Tx) or received (Rx) RF power)

into a digital code, ensuring optimum Tx power setting

and Rx signal analysis. An additional direct input to the

ADC provides for system-supervision measurements,

such as power-supply voltages, battery voltage, and

temperature.

Four DAC blocks typically control DC levels in radios.

As part of the Maxim PWT1900 chip set, the two 7-bit

DACs control the gain settings and the two 6-bit DACs

control the varactor diodes to tune a TCXO and bias a

GaAs amplifier. Each DAC register and output can be

updated independently, providing maximum flexibility.

For antenna diversity, a magnitude-comparison circuit

captures and compares two peak signals. A latched

logic-comparator output reveals which signal has the

largest magnitude. The MAX1007 also includes an on-

board voltage reference for the ADC and DACs.

The MAX1007 offers a high level of signal integrity with

minimal power dissipation. Single-supply operation

ranges from +2.85V to +3.6V. To further save power, there

are two shutdown modes: standby and total shutdown.

Standby is a partial shutdown that keeps the bandgap

reference and the 2.4V reference generator active. Total

shutdown disables all circuit blocks except the serial

interface, reducing supply current to less than 1µA.

The MAX1007 is available in a 24-pin SSOP and is

specified for commercial and extended temperature

ranges.

________________________Applications

PWT1900

Wireless Communications:

Cellular Radios

PMR/SMR

PCS Radios

WLL

____________________________Features

o Multi-Input 8-Bit ADC

o Two 7-Bit DACs with Buffered Outputs

o Two 6-Bit DACs: Buffered/Unbuffered

o Power-Sense Conditioning Circuitry

o RSSI Measurement

o Antenna-Diversity Circuitry

o Internal Reference

o Serial-Logic Interface

o +2.85V to +3.6V Single-Supply Operation

o Two Shutdown Modes

Mobile-Radio Analog Controller

________________________________________________________________

Maxim Integrated Products

1

19-1180; Rev 0; 6/98

PART

MAX1007CAG

MAX1007EAG

-40°C to +85°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

24 SSOP

24 SSOP

Ordering Information

Pin Configuration appears at end of data sheet.

CS

SCLK

DIN

7

DOUT

SDAC

CH0

ADC

POWER

SENSE

RPS

RSSI

FPS1

FPS2

SDAC

XDAC

SDG

GDAC

KDAC

CH1

PSBIAS

PSDCTRL

PREAMBLE-SWITCHED DIVERSITY

POWER SENSE CIRCUITRY

PSDWDW

DUAL

T/H

VREF

XDAC

GDAC

KDAC

REF

PSOUT

BANT

ADC CTRL

PKWDW

6

6

7

D FLIP-FLOP

MAX1007

Functional Diagram

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.