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_______________General Description

The MAX1005 is a combined digitizer and reconstruc-

tion integrated circuit designed to work in systems that

demodulate and modulate communications signals. It

integrates IF undersampling and signal synthesis func-

tions into a single, low-power circuit. Its analog-to-

digital converter (ADC) is used to directly sample or

undersample a downconverted RF signal, while its

digital-to-analog converter (DAC) recreates the IF sub-

carrier and transmission data. The MAX1005’s ADC is

ideal for undersampling applications, due to the analog

input amplifier’s wide (15MHz) bandwidth. The DAC

has very low glitch energy, which minimizes the trans-

mission of unwanted spurious signals. An on-chip

reference provides for low-noise ADC and DAC conver-

sions.

The MAX1005 provides a high level of signal integrity

from a low power budget. It operates from a single

power supply, or from separate analog and digital sup-

plies with independent voltages ranging from +2.7V to

+5.5V. The MAX1005 can operate with an unregulated

analog supply of 5.5V and a regulated digital supply

down to 2.7V. This flexible power-supply operation

saves additional power in complex digital systems.

The MAX1005 has three operating modes: transmit

(DAC active), receive (ADC active), and shutdown

(ADC and DAC inactive). In shutdown mode, the total

supply current drops below 1µA. The device requires

only 2.4µs to wake up from shutdown mode. The

MAX1005 is ideal for hand-held, as well as base-station

applications. It is available in a tiny 16-pin QSOP pack-

age specified for operation over both the commercial

and extended temperature ranges.

________________________Applications

PWT1900

PHS/P

Wireless Loops

PCS/N

____________________________Features

o Differential-Input, 5-Bit ADC

o Differential-Output, 7-Bit DAC

o 15Msps Min Conversion Rate

o 25MHz -1dB Full-Power Bandwidth

o 44dB SFDR for ADC

39dB at 10.7MHz SFDR (Imaged) for DAC

o Internal Voltage Reference

o Parallel Logic Interface

o Single-Supply Operation (+2.7V to +5.5V)

o 0.1µA Low-Power Shutdown Mode

IF Undersampler

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

VCCD

CLK

D0

D1

D2

D3

D4

D5

D6

TOP VIEW

MAX1005

QSOP

DGND

RXEN

TXEN

AIO+

AIO-

AGND

VCCA

__________________Pin Configuration

19-1291; Rev 0; 9/97

PART

MAX1005CEE

MAX1005EEE

-40°C to +85°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 QSOP

16 QSOP

______________Ordering Information

Functional Diagram appears at end of data sheet.