Micro Linear Corporation ML2731, ML2712, ML2713 Datasheet

BRIEF

2.4GHz FHSS Radio Chipset

product

802.11 Compatible

Very Small Form Factor

Auto Aligning Discriminator

ML2712

2.4GHz Radio Transceiver

ML2713

Radio IF Transceiver

ML2731

PA Bias Controller

3 Wire Interface

10µs Tx-Rx Switching

ML2712

1LO and 2LO VCO and PLL

On-Chip

1LO and 2LO Tank Circuits

Off-Chip

Directly Modulated VCO

Transmitter

PLL Programming with 3 Wire

IF

Operation to 2.5GHz
48 Pin TQFP Package

Features

ML2713

Image Reject Up - Convert

Mixer On-Chip

Receive Down - Convert Mixer

On-Chip

Integrated Discriminator and

Filter Alignment Circuits

High Signal to Noise at

Discriminator Output

Received Signal Strength

Indication Output

On-Chip DAC Generates

Modulated IF

Low Noise Regulator Output
48 Pin TQFP Package

ML2731

PA Current Control
10MHz - 40MHz Frequency

Range

Fast Start Negative Voltage

Generator

On-Chip Regulators
16 Pin TSSOP Package

2.4GHz FHSS Radio Chipset

The 2.4GHz radio chipset is targeted at the IEEE802.11 Frequency Hopping Spread Spectrum
standard. Two devices; ML2712 2.4GHz RF Transceiver and the ML2713 IF Transceiver implement
a very highly integrated, easy to use radio with a low cost bill of materials. The transmit path
includes a DAC and IF up converter in the ML2713 followed by an integrated transmit PLL, 2.4GHz
mixer and directly modulated VCO in the ML2712. The result is accurate digital generation of
the modulated signal for 802.11 compatibility and maintenance of adequate transmitter range even
without RF bandpass filters. The dual conversion receiver features high dynamic range and support
for the 4G FSK/2Mbps requirement of 802.11 standard. The chipset also inplements a self aligning
descriminator adjusted with every frequency hop.
An optional ML2731 PA Bias Controller completes the set.

Block Diagram

VPA

VBIAS

VNEG

C1
C2

Transmit

Power

Amplifier

PA on/off switch

and current sense

Bias Control

Negative voltage

generator

Voltage

Regulator

REGO

WB Charge

Pump/WB

Phase Comp

R. C.
Loop
Filter

LPF

ML2731

Crystal

Oscillator

Sine & square

wave drivers

SINO

ML2712

MUX

CLKO

x2

PAEN

ICON

NEGEN

XIN

XOUT

PDN

PLL 2

PLL 1

Crystal

DAC

2LO VCO

1LO VCO

RSSI

Input

+
–

Lock

Detect

2LO Loop

Filter &

Tank Circuit

1LO Loop

Filter &

Tank Circuit

32MHz

Clock

Reference
Frequency

Input

Baseband

IC

Image Reject Rx IF

Downconverter

Tx Regulator

Output

ML2713

Tx Regulator

Output

Micro Linear makes no representations or warranties with respect to the accuracy, utility, or completeness of the contents of this publication and reserves the right to make changes to specifications and product
descriptions at any time without notice. No license, express or implied, by estoppel or otherwise, to any patents or other intellectual property rights is granted by this document. The circuits contained in this
document are offered as possible applications only. Particular uses or applications may invalidate some of the specifications and/or product descriptions contained herein. The customer is urged to perform its
own engineering review before deciding on a particular application. Micro Linear assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Micro Linear
products including liability or warranties relating to merchantability, fitness for a particular purpose, or infringement of any intellectual property right. Micro Linear products are not designed for use in medical,

Image Reject Tx

DC

IF Upconverter

Reg

RSSI

Limiter

Interface

Control

Discrim-

inator

Quad &

Filter

Auto Align

Control
Circuits

Data Filter

DAC

D/A Input

DC

Restore

Rx Out

+
–

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10k 0200 PB2712-01