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MAX19705ETM

10-Bit, 7.5Msps, Ultra-Low-Power Analog Front-End

Maxim Integrated 

19-3763; Rev 0; 8/05

EVAALVUAAILTAIOBNLEKIT

10-Bit, 7.5Msps, Ultra-Low-Power

Analog Front-End

General Description

The MAX19705 is an ultra-low-power, mixed-signal ana-

log front-end (AFE) designed for power-sensitive com-

munication equipment. Optimized for high dynamic

performance at ultra-low power, the device integrates a

dual 10-bit, 7.5Msps receive (Rx) ADC; dual 10-bit,

7.5Msps transmit (Tx) DAC; three fast-settling 12-bit

aux-DAC channels for ancillary RF front-end control;

and a 10-bit, 333ksps housekeeping aux-ADC. The typ-

ical operating power in Tx-Rx FAST mode is 28.2mW at

a 7.5MHz clock frequency.

The Rx ADCs feature 55.1dB SNR and 73.4dBc SFDR at

a 1.875MHz input frequency with a 7.5MHz clock fre-

quency. The analog I/Q input amplifiers are fully differen-

tial and accept 1.024VP-P full-scale signals. Typical I/Q

channel matching is ±0.01° phase and ±0.02dB gain.

The Tx DACs feature 77.2dBc SFDR at fOUT = 620kHz

and fCLK = 7.5MHz. The analog I/Q full-scale output

voltage is ±400mV differential. The Tx DAC common-

mode DC level is programmable from 0.9V to 1.35V.

The I/Q channel offset is adjustable. The typical I/Q

channel matching is ±0.03dB gain and ±0.08° phase.

The Rx ADC and Tx DAC share a single, 10-bit parallel,

high-speed digital bus allowing half-duplex operation

for time-division duplex (TDD) applications. A 3-wire

serial interface controls power-management modes, the

aux-DAC channels, and the aux-ADC channels.

The MAX19705 operates on a single +2.7V to +3.3V

analog supply and +1.8V to +3.3V digital I/O supply.

The MAX19705 is specified for the extended (-40°C to

+85°C) temperature range and is available in a 48-pin,

thin QFN package. The Selector Guide at the end of the

data sheet lists other pin-compatible versions in this

AFE family.

Applications

Broadband Access Radio

Private Mobile Radio (PMR)

Portable Communication Equipment

Ordering Information

PART*

PIN-PACKAGE

PKG CODE

MAX19705ETM

48 Thin QFN-EP**

T4877-4

MAX19705ETM+ 48 Thin QFN-EP**

T4877-4

*All devices are specified over the -40°C to +85°C operating

range.

**EP = Exposed paddle.

+Denotes lead-free package.

Features

♦ Dual 10-Bit, 7.5Msps Rx ADC and Dual 10-Bit,

7.5Msps Tx DAC

♦ Ultra-Low Power

28.2mW at fCLK = 7.5MHz, Fast Mode

21mW at fCLK = 7.5MHz, Slow Mode

Low-Current Standby and Shutdown Modes

♦ Programmable Tx DAC Common-Mode DC Level

and I/Q Offset Trim

♦ Excellent Dynamic Performance

SNR = 55.1dB at fIN = 1.875MHz (Rx ADC)

SFDR = 77.2dBc at fOUT = 620kHz (Tx DAC)

♦ Three 12-Bit, 1µs Aux-DACs

♦ 10-Bit, 333ksps Aux-ADC with 4:1 Input Mux and

Data Averaging

♦ Excellent Gain/Phase Match

±0.01° Phase, ±0.02dB Gain (Rx ADC) at

fIN = 1.875MHz

♦ Multiplexed Parallel Digital I/O

♦ Serial-Interface Control

♦ Versatile Power-Control Circuits

Shutdown, Standby, Idle, Tx/Rx Disable

♦ Miniature 48-Pin Thin QFN Package

(7mm x 7mm x 0.8mm)

Pin Configuration

TOP VIEW

36 35 34 33 32 31 30 29 28 27 26 25

DAC2 37

DAC1 38

VDD 39

IDN 40

IDP 41

GND 42

VDD 43

QDN 44

QDP 45

REFIN 46

COM 47

REFN 48

MAX19705

EXPOSED PADDLE (GND)

1 2 3 4 5 6 7 8 9 10 11 12

24 D9

23 D8

22 D7

21 D6

20 OVDD

19 OGND

18 D5

17 D4

16 D3

15 D2

14 D1

13 D0

Functional Diagram and Selector Guide appear at end of

data sheet.

THIN QFN

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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