_______________General Description

The monolithic MAX2452 is a quadrature modulator

with supporting oscillator and divide-by-8 prescaler. It

operates from a single +3V supply and draws only

4.1mA. The modulator accepts differential I and Q

baseband signals with amplitudes up to 1.35Vp-p and

bandwidths up to 15MHz. It produces a differential out-

put up to 80MHz.

Pulling the CMOS-compatible ENABLE pin low reduces

the supply current to 2µA. To minimize spurious feed-

back, the MAX2452’s internal oscillator is set at twice

the IF via external tuning components. The oscillator

and associated phase shifters produce differential sig-

nals exhibiting low amplitude and phase imbalance,

yielding 42dB sideband rejection. The MAX2452 comes

in a 16-pin narrow SO package.

________________________Applications

Digital Cordless Phones

GSM and North American Cellular Phones

Wireless LANs

Digital Communications

Two-Way Pagers

____________________________Features

o IF Output Frequency up to 80MHz

o Input Bandwidth up to 15MHz

o On-Chip Oscillator with External Tuning Circuit

o On-Chip Divide-by-8 Prescaler

o Integrated Quadrature Phase Shifters

o Self-Biased Differential Baseband Inputs

o CMOS-Compatible Enable

o 4.1mA Operating Supply Current

2µA Shutdown Supply Current

3V, Ultra-Low-Power

Quadrature Modulator

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

IF

GND

N.C.

PRE_OUT

LO_GND

TANK

IF

GND

I

I

Q

Q

ENABLE

TANK

TOP VIEW

MAX2452

SO

MAX2452

MODULATOR

LOCAL

OSCILLATOR

÷2

÷2

÷4

QUADRATURE

PHASE

GENERATOR

90°

0°

Σ

TANK

TANK

LO_GND

I

I

Q

Q

PRE_OUT

IF

IF

BANDGAP

BIAS

GND

ENABLE

PRESCALER

11

8

9

10

3

4

5

6

14

12

16

1

7

2, 15

MASTER BIAS

__________________Pin Configuration

________________Functional Diagram

Call toll free 1-800-998-8800 for free samples or literature.

PART

MAX2452ISE*

-20°C to +85°C

TEMP. RANGE

PIN-PACKAGE

16 Narrow SO

EVALUATION

KIT

AVAILABLE

______________Ordering Information

19-0425; Rev 1; 9/95

* An alternate marking, MAX2452CSE, has been identically tested.