MAX19700 查看數據表（PDF） - Maxim Integrated

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MAX19700

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

Maxim Integrated 

19-3549; Rev 0; 2/05

EVAALVUAAILTAIOBNLEKIT

7.5Msps, Ultra-Low-Power

Analog Front-End

General Description

The MAX19700 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 MAX19700 integrates a

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

7.5Msps transmit (Tx) DAC with TD-SCDMA baseband

filters, and three fast-settling 12-bit aux-DAC channels

for ancillary RF front-end control. The typical operating

power in Tx-Rx FAST mode is 36.3mW at a 5.12Msps

clock frequency.

The Rx ADCs feature 54.9dB SINAD and 78dBc SFDR

at a 1.87MHz input frequency with a 7.5Msps sample

frequency. The analog I/Q input amplifiers are fully dif-

ferential and accept 1.024VP-P full-scale signals.

Typical I/Q channel matching is ±0.22° phase and

±0.02dB gain.

The Tx DACs with TD-SCDMA lowpass filters feature

-3dB cutoff frequency of 1.27MHz and >55dB stop-

band rejection at fIMAGE = 4.32MHz. The analog I/Q

full-scale output voltage range is selectable at ±410mV

or ±500mV. The output common-mode voltage is selec-

table from 0.9V to 1.4V and the I/Q channel offset is

adjustable. The typical I/Q channel matching is

±0.05dB gain and ±0.16° 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

and the aux-DAC channels.

The MAX19700 operates on a single +2.7V to +3.3V

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

The MAX19700 is specified for the extended (-40°C to

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

thin QFN package.

Applications

TD-SCDMA Handsets

TD-SCDMA Data Cards

Portable Communication Equipment

Ordering Information

PART*

MAX19700ETM

MAX19700ETM+

PIN-PACKAGE

48 Thin QFN-EP**

48 Thin QFN-EP**

PKG CODE

T4877-4

T4877-4

Features

♦ Dual 10-Bit Rx ADC and Dual 10-Bit Tx DAC

♦ Ultra-Low Power

36.3mW at fCLK = 5.12Msps, Fast Mode

19.8mW at fCLK = 5.12Msps, Slow Mode

Low Standby and Shutdown Current

♦ Integrated TD-SCDMA Filters with >55dB

Stopband Rejection

♦ Excellent Dynamic Performance

SINAD = 54.9dB at fIN = 1.87MHz (Rx ADC)

SFDR = 76.5dBc at fOUT = 620kHz (Tx DAC)

♦ Excellent Gain/Phase Match

±0.22° Phase, ±0.02dB Gain (Rx ADC) at

fIN = 1.87MHz at -0.5dBFS

♦ Three 12-Bit, 1µs Aux-DACs

♦ Single-Supply Operation

♦ 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

REFP 1

VDD 2

IAP 3

IAN 4

GND 5

CLK 6

GND 7

VDD 8

QAN 9

QAP 10

VDD 11

GND 12

MAX19700

EXPOSED PADDLE (GND)

36 DAC3

35 N.C.

34 N.C.

33 VDD

32 GND

31 VDD

30 CS

29 SCLK

28 DIN

27 T/R

26 DR

25 SHDN

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

range.

**EP = Exposed paddle.

+Denotes lead-free package.

Functional Diagram appears 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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