MAX11008EVC16【PDF 1/67 页】EVAL KIT MAX11008

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19-4371; Rev 0; 11/08

ATION

EVALU

AVAIL

KIT

ABLE

Dual RF LDMOS Bias Controller with

Nonvolatile Memory

General Description

The MAX11008 controller biases RF LDMOS power

devices found in cellular base stations and other wire-

less infrastructure equipment. Each controller includes

a high-side current-sense amplifier with programmable

gains of 2, 10, and 25 to monitor the LDMOS drain cur-

rent over a range of 20mA to 5A. The MAX11008 sup-

ports up to two external diode-connected transistors to

monitor the LDMOS temperatures while an internal tem-

perature sensor measures the local die temperature. A

12-bit successive-approximation register (SAR) analog-

to-digital converter (ADC) converts the analog signals

from the programmable-gain amplifiers (PGAs), exter-

nal temperature sensors, internal temperature measure-

ment, and two additional auxiliary inputs. The

MAX11008 automatically adjusts the LDMOS bias volt-

ages by applying temperature, AIN, and/or drain cur-

rent samples to data stored in lookup tables (LUTs).

The MAX11008 includes two gate-drive channels, each

consisting of a 12-bit DAC to generate the positive gate

voltage for biasing the LDMOS devices. Each gate-

drive output supplies up to ±2mA of gate current. The

gate-drive amplifier is current-limited to ±25mA and

features a fast clamp to AGND.

The MAX11008 contains 4Kb of on-chip, nonvolatile

EEPROM organized as 256 bits x 16 bits to store LUTs

and register information. The device operates from

either a 4-wire 16MHz SPI?-/MICROWIRE?-compati-

ble or an I 2 C-compatible serial interface.

The MAX11008 operates from a +4.75V to +5.25V ana-

log supply with a typical supply current of 2mA, and a

+2.7V to +5.25V digital supply with a typical supply of

3mA. The device is packaged in a 48-pin, 7mm x 7mm,

thin QFN package and operates over the extended

(-40°C to +85°C) temperature range.

Applications

Features

? On-Chip 4Kb EEPROM for Storing LDMOS Bias

Characteristics

? Integrated High-Side Current-Sense PGA with

Gain of 2, 10, or 25

? ±0.75% Accuracy for Sense Voltage Between

+75mV and +1250mV

? Full-Scale Sense Voltage

+100mV with a Gain of 25

+250mV with a Gain of 10

+1250mV with a Gain of 2

? Common-Mode Range, LDMOS Drain Voltage:

+5V to +32V

? Adjustable Low-Noise 0 to AV DD Output Gate

Bias Voltage Range

? Fast Clamp to AGND for LDMOS Protection

? 12-Bit DAC Control of Gate with Temperature

? Internal Die Temperature Measurement

? 2-Channel External Temperature Measurement

through Remote Diodes

? Internal 12-Bit ADC Measurement for

Temperature, Current, and Voltage Monitoring

? User-Selectable Serial Interface

400kHz/1.7MHz/3.4MHz I 2 C-Compatible Interface

16MHz SPI-/MICROWIRE-Compatible Interface

Ordering Information

Cellular Base Stations

Microwave Radio Links

Feed-Forward Power Amps

PART

MAX11008BETM+

PIN-PACKAGE

48 TQFN-EP*

TEMP

ERROR (°C)

±3

Transmitters

Industrial Process Control

+Denotes a lead-free/RoHS-compliant package.

*EP = Exposed pad.

Note: The device is specified over the -40°C to +85°C operating

temperature range.

SPI is a trademark of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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