AD6459 datasheet, PDF - EEWORLD Datasheet

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AD6459: Descriptiongsm 3 V receiver IF subsystem; File Size314KB，12 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD6459 Overview

gsm 3 V receiver IF subsystem

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FEATURES

Fully Compliant with Standard and Enhanced GSM

Specification

–11 dBm Input 1 dB Compression Point

0 dBm Input Third Order Intercept

10 dB SSB Noise Figure (50 )

DC-500 MHz RF and LO Bandwidths

Linear IF Amplifier

Linear-in-dB and Stable over Temperature

Voltage Gain Control

Quadrature Demodulator

On-Board Phase-Locked Quadrature Oscillator

Demodulates IFs from 5 MHz to 50 MHz

Low Power

8 mA at Midgain

2 A Sleep Mode Operation

2.7 V to 5.5 V Operation

Interfaces to AD7013, AD7015 and AD6421 Baseband

Converters

20-Lead SSOP

GSM 3 V Receiver IF Subsystem

AD6459

FUNCTIONAL BLOCK DIAGRAM

BPF

PLL

GAIN

CONTROL

FREF

AD6459

GENERAL DESCRIPTION

The AD6459 is a 3 V, low power receiver IF subsystem for

operation at input frequencies as high as 500 MHz and IFs

from 5 MHz up to 50 MHz. It is optimized for operation in

GSM, DCS1800 and PCS1900 receivers. It consists of a mixer,

an IF amplifier, I and Q demodulators, a phase-locked quadra-

ture oscillator, a precise AGC subsystem, and a biasing system

with external power-down.

The AD6459’s low noise, high intercept mixer is a doubly-

balanced Gilbert-Cell type. It has a nominal –11 dBm input-

referred 1 dB compression point and a 0 dBm input-referred

third-order intercept. The mixer section of the AD6459 also

includes a local oscillator (LO) preamplifier, which lowers the

required LO drive to –16 dBm.

The gain control input accepts an external gain-control voltage

input from an external AGC detector or a DAC. It provides an

80 dB gain range with 27 mV/dB gain scaling.

The I and Q demodulators provide in-phase and quadrature

baseband outputs to interface with Analog Devices’ AD7013

(IS54, TETRA, MSAT) AD7015 and AD6421 (GSM,

DCS1800, PCS1900) baseband converters. An on-board

quadrature VCO that is externally phase-locked to the IF signal

drives the I and Q demodulators. This locked reference signal is

normally provided by an external VCTCXO under the control of

the radio’s digital processor. The AD6459 can also provide

demodulation of N-PSK and N-QAM in many non-TDMA

systems when used with external analog carrier recovery systems

such as the Costas Loop. Finally, the VCO can be phase-locked

to a frequency that is deliberately offset from the IF as in the

case of a Beat-Frequency oscillator (BFO) resulting in the

product detection of CW or SSB.

The AD6459 uses supply voltages from 2.7 V to 5.5 V over the

temperature range of –40°C to +85°C. Operation is enabled by a

CMOS logical level; response time is typically < 80

µs.

When

disabled, the standby current is reduced to 2

µA.

The AD6459 comes in a 20-pin shrink small outline (SSOP)

surface mount package.

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

World Wide Web Site: http://www.analog.com

Fax: 617/326-8703

AD6459 Related Products

	AD6459	AD6459ARS
Description	gsm 3 V receiver IF subsystem	gsm 3 V receiver IF subsystem

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