MAX19708 Просмотр технического описания (PDF) - Maxim Integrated

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MAX19708

10-Bit, 11Msps, Ultra-Low-Power Analog Front-End

Maxim Integrated 

19-3764; Rev 0; 8/05

EVAALVUAAILTAIOBNLEKIT

10-Bit, 11Msps, Ultra-Low-Power

Analog Front-End

General Description

The MAX19708 is an ultra-low-power, mixed-signal ana-

log front-end (AFE) designed for TD-SCDMA handsets

and data cards. Optimized for high dynamic perfor-

mance at ultra-low power, the device integrates a dual

10-bit, 11Msps receive (Rx) ADC; dual 10-bit, 11Msps

transmit (Tx) DAC with TD-SCDMA baseband filters;

three fast-settling 12-bit aux-DAC channels for ancillary

RF front-end control; and a 10-bit, 333ksps housekeep-

ing aux-ADC. The typical operating power in Tx-Rx

FAST mode is 36.9mW at a 5.12MHz clock frequency.

The Rx ADCs feature 55dB SNR and 77.4dBc SFDR at a

1.87MHz input frequency with an 11MHz clock frequen-

cy. The analog I/Q input amplifiers are fully differential

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

channel matching is ±0.08° phase and ±0.02dB gain.

The Tx DACs with TD-SCDMA lowpass filters feature -3dB

cutoff frequency of 1.32MHz and > 55dB stopband rejec-

tion at fIMAGE = 4.32MHz. The analog I-Q full-scale output

voltage range is selectable at ±410mV or ±500mV differ-

ential. The output DC common-mode voltage is selec-

table from 0.9V to 1.4V. The I/Q channel offset is

adjustable to optimize radio lineup sideband/carrier sup-

pression. Typical I-Q channel matching is ±0.02dB gain

and ±0.04° 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 MAX19708 operates on a single +2.7V to +3.3V

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

The MAX19708 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

TD-SCDMA Handsets

TD-SCDMA Data Cards

Portable Communication Equipment

Ordering Information

Features

♦ Dual 10-Bit, 11Msps Rx ADC and Dual 10-Bit,

11Msps Tx DAC

♦ Ultra-Low Power

36.9mW at fCLK = 5.12MHz, Fast Mode

19.8mW at fCLK = 5.12MHz, Slow Mode

Low-Current Standby and Shutdown Modes

♦ Integrated TD-SCDMA Filters with > 55dB

Stopband Rejection

♦ Programmable Tx DAC Common-Mode DC Level

and I/Q Offset Trim

♦ Excellent Dynamic Performance

SNR = 55dB at fIN = 1.87MHz (Rx ADC)

SFDR = 73dBc 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

±0.08° Phase, ±0.02dB Gain (Rx ADC) at

fIN = 1.87MHz

♦ 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

MAX19708

EXPOSED PADDLE (GND)

24 D9

23 D8

22 D7

21 D6

20 OVDD

19 OGND

18 D5

17 D4

16 D3

15 D2

14 D1

13 D0

PART*

PIN-PACKAGE

PKG CODE

MAX19708ETM

48 Thin QFN-EP**

T4877-4

MAX19708ETM+ 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.

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

THIN QFN

Functional Diagram and Selector Guide appear at end of

data sheet.

________________________________________________________________ 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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