AD8346ARUZ Analog Devices, AD8346ARUZ Datasheet

AD8346ARUZ

Manufacturer Part Number

AD8346ARUZ

Description

Manufacturer

Analog Devices

Datasheet

1.AD8346ARUZ.pdf (20 pages)

Specifications of AD8346ARUZ

06+

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FEATURES

High accuracy

Broad frequency range: 0.8 GHz to 2.5 GHz

Sideband suppression: −46 dBc @ 0.8 GHz

Sideband suppression: −36 dBc @ 1.9 GHz

Modulation bandwidth: dc to 70 MHz

0 dBm output compression level @ 0.8 GHz

Noise floor: −147 dBm/Hz

Single 2.7 V to 5.5 V supply

Quiescent operating current: 45 mA

Standby current: 1 μA

16-lead TSSOP

APPLICATIONS

Digital and spread spectrum communication systems

Cellular/PCS/ISM transceivers

Wireless LAN/wireless local loop

QPSK/GMSK/QAM modulators

Single-sideband (SSB) modulators

Frequency synthesizers

Image reject mixer

GENERAL DESCRIPTION

The AD8346 is a silicon RFIC I/Q modulator for use from

0.8 GHz to 2.5 GHz. Its excellent phase accuracy and amplitude

balance allow high performance direct modulation to RF.

The differential LO input is applied to a polyphase network

phase splitter that provides accurate phase quadrature from

0.8 GHz to 2.5 GHz. Buffer amplifiers are inserted between

two sections of the phase splitter to improve the signal-to-

noise ratio. The I and Q outputs of the phase splitter drive the

LO inputs of two Gilbert-cell mixers. Two differential V-to-I

converters connected to the baseband inputs provide the

baseband modulation signals for the mixers. The outputs of

the two mixers are summed together at an amplifier which is

designed to drive a 50 Ω load.

Rev. A

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective companies.

1 degree rms quadrature error @ 1.9 GHz

0.2 dB I/Q amplitude balance @ 1.9 GHz

This quadrature modulator can be used as the transmit mod-

ulator in digital systems such as PCS, DCS, GSM, CDMA, and

ISM transceivers. The baseband quadrature inputs are directly

modulated by the LO signal to produce various QPSK and

QAM formats at the RF output.

Additionally, this quadrature modulator can be used with direct

digital synthesizers in hybrid phase-locked loops to generate

signals over a wide frequency range with millihertz resolution.

The AD8346 comes in a 16-lead TSSOP package, measuring

6.5 mm × 5.1 mm × 1.1 mm. It is specified to operate over a

−40°C to +85°C temperature range and a 2.7 V to 5.5 V supply

voltage range. The device is fabricated on Analog Devices’ high

performance 25 GHz bipolar silicon process.

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

Tel: 781.329.4700

Fax: 781.461.3113

COM1

ENBL

VPS1

IBBN

IBBP

LOIN

LOIP

FUNCTIONAL BLOCK DIAGRAM

Quadrature Modulator

SPLITTER

PHASE

BIAS

0.8 GHz to 2.5 GHz

Figure 1.

AD8346

www.analog.com

AD8346

QBBP

QBBN

COM4

VPS2

VOUT

COM3

COM2

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