LT5503EFE datasheet, PDF - EEWORLD Datasheet

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LT5503EFE: Description1.2GHz to 2.7GHz Direct IQ Modulator and Mixer; CategoryWireless rf/communication Radio frequency and microwave; File Size206KB，20 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LT5503EFE Overview

1.2GHz to 2.7GHz Direct IQ Modulator and Mixer

LT5503EFE Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	TSSOP
package instruction	PLASTIC, TSSOP-20
Contacts	20
Manufacturer packaging code	FE
Reach Compliance Code	_compli
ECCN code	EAR99
Characteristic impedance	50 Ω
structure	COMPONENT
Maximum input power (CW)	-10 dBm
JESD-609 code	e0
modulation technology	I/Q
Maximum operating frequency	2700 MHz
Minimum operating frequency	1200 MHz
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
RF/Microwave Device Types	MODULATOR
Terminal surface	Tin/Lead (Sn/Pb)
Maximum voltage standing wave ratio	1.5

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Final Electrical Specifications

LT5503

1.2GHz to 2.7GHz Direct

IQ Modulator and Mixer

FEATURES

DESCRIPTIO

October 2001

Single 1.8V to 5.25V Supply

Direct IQ Modulator with Integrated 90° Phase

Shifter*

Four Step RF Power Control

120MHz Modulation Bandwidth

Independent Double-Balanced Mixer

Modulation Accuracy Insensitive to Carrier Input

Power

Modulator I/Q Inputs Internally Biased

The LT

5503 is a front-end transmitter IC designed for low

voltage operation, and is compatible with the LTC family of

WLAN products. The IC contains a high frequency quadra-

ture modulator with a variable gain amplifier (VGA) and a

balanced mixer. The modulator includes a precision 90°

phase shifter which allows direct modulation of an RF

signal by the baseband I and Q signals.

In a superheterodyne system, the mixer can be used to

generate the high-frequency RF input for the modulator by

mixing the system’s 1st and 2nd local oscillators.

The LT5503 modulator output delivers –3dBm at 2.5GHz.

The VGA allows output power reduction in three steps up

to 13dB with digital control. The baseband inputs are

internally biased for maximum input voltage swing at low

supply voltage. If needed, they can be driven with external

bias voltages.

APPLICATIO S

IEEE 802.11 DSSS and FHSS

High Speed Wireless LAN (WLAN)

Wireless Local Loop (WLL)

PCS Wireless Data

MMDS

, LTC and LT are registered trademarks of Linear Technology Corporation.

*Patent Pending

TYPICAL APPLICATIO

2.45GHz

BPF

CC2

CC1

–2

LO2 V

LO1

MIXER

ENABLE

MODULATOR

ENABLE

LO2IN

(750MHz)

MIXEN

MODEN

LO2

÷2

–

MODIN V

MOD

VGA

OUTPUT POWER (dBm)

–

0°

÷1

90°

MODOUT

VGA

CONTROL

LOGIC

GND

DMODE

LO1

LO1IN (2075MHz)

GC1 GC2

5503 F01

–

2.45GHz

MODULATED

RFOUT

Figure 1. 2.45GHz Transmitter Application, Carrier for Modulator Generated by Upmixer

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

–3

–4

–5

–6

1.8

2.4

2.45GHz Modulated Output

Power vs Supply Voltage

LO1

= –12dBm

LO2

= –18dBm

BASEBAND = 1V

P-P

= 27°C

3.0

3.6

4.2

SUPPLY VOLTAGE (V)

4.8

5.4

5503 TA01b

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