Rainbow-electronics MAX1386 Instrukcja Użytkownika Pobierz pdf (Strona 1)

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.

General Description

The MAX1385/MAX1386 set and control bias conditions

for dual RF LDMOS power devices found in cellular

base stations. Each device includes a high-side cur-

rent-sense amplifier with programmable gains of 2, 10,

and 25 to monitor LDMOS drain current over the 20mA

to 5A range. Two external diode-connected transistors

monitor LDMOS temperatures while an internal temper-

ature sensor measures the local die temperature of the

MAX1385/MAX1386. A 12-bit ADC converts the pro-

grammable-gain amplifier (PGA) outputs, external/inter-

nal temperature readings, and two auxiliary inputs.

The two gate-drive channels, each consisting of 8-bit

coarse and 10-bit fine DACs and a gate-drive amplifier,

generate a positive gate voltage to bias the LDMOS

devices. The MAX1385 includes a gate-drive amplifier

with a gain of 2 and the MAX1386 gate-drive amplifier

provides a gain of 4. The 8-bit coarse and 10-bit fine

DACs allow up to 18 bits of resolution. The MAX1385/

MAX1386 include autocalibration features to minimize

error over time, temperature, and supply voltage.

The MAX1385/MAX1386 feature an I

C/SPI™-compatible

serial interface. Both devices operate from a 4.75V to

5.25V analog supply (3.2mA supply current), a 2.7V to

5.25V digital supply (3.1mA supply current), and a 4.75V

to 11.0V gate-drive supply (4.5mA supply current). The

MAX1385/MAX1386 are available in a 48-pin thin QFN

package.

Applications

RF LDMOS Bias Control in Cellular Base Stations

Industrial Process Control

Features

♦ Integrated High-Side Drain Current-Sense PGA

with Gain of 2, 10, or 25

♦ ±0.5% Accuracy for Sense Voltage Between 75mV

and 250mV

♦ Full-Scale Sense Voltage of 100mV with Gain of 25

♦ Full-Scale Sense Voltage of 250mV with Gain of 10

♦ Common-Mode Range of 5V to 30V Drain Voltage

for LDMOS

♦ Adjustable Low Noise 0 to 5V, 0 to 10V Output

Gate-Bias Voltage Ranges with ±10mA Gate Drive

♦ Fast Clamp to 0V for LDMOS Protection

♦ 8-Bit DAC Control of Gate-Bias Voltage

♦ 10-Bit DAC Control of Gate-Bias Offset with

Temperature

♦ Internal Die Temperature Measurement

♦ External Temperature Measurement by Diode-

Connected Transistor (2N3904)

♦ Internal 12-Bit ADC Measurement of Temperature,

Current, and Voltages

♦ Selectable I

C-/SPI-Compatible Serial Interface

400kHz/1.7MHz/3.4MHz I

C-Compatible Control

for Settings and Data Measurement

16MHz SPI-Compatible Control for Settings

and Data Measurement

♦ Internal 2.5V Reference

♦ Three Address Inputs to Control Eight Devices in

C Mode

MAX1385/MAX1386

Dual RF LDMOS Bias Controllers

with I

C/SPI Interface

________________________________________________________________

Maxim Integrated Products

19-4456; Rev 0; 2/09

EVALUATION KIT

AVAILABLE

Ordering Information/Selector Guide

PART TEMP RANGE PIN-PACKAGE TEMP ERROR (°C) V

GATE

(V)

MAX1385AETM+** -40°C to +85°C 48 Thin QFN-EP* ±1 5

MAX1385BETM+ -40°C to +85°C 48 Thin QFN-EP* ±2 5

MAX1386AETM+** -40°C to +85°C 48 Thin QFN-EP* ±1 10

MAX1386BETM+** -40°C to +85°C 48 Thin QFN-EP* ±2 10

SPI is a trademark of Motorola, Inc.

EP = Exposed pad.

Future product—contact factory for availability.

Denotes a lead(Pb)-free/RoHS-compliant package.

Pin Configuration and Typical Operating Circuit (I

C Mode)

appear at end of data sheet.

1 2 3 4 5 6 ... 51 52

MAX1385/MAX1386 1
C/SPI Interface 1

Podsumowanie treści

Strona 1 - C/SPI Interface

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.General De

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MAX1385/MAX1386Dual RF LDMOS Bias Controllerswith I2C/SPI Interface10 ________________________________________________________________________________

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