CHR2244

RoHS COMPLIANT

Ref. : DSCHR2244QDG5053 - 22 Feb 05

1/16

Specifications subject to change without notice

united monolithic semiconductors S.A.S.

Route Départementale 128 - B.P.46 - 91401 Orsay Cedex France

Tel. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09

5.8 GHz One Antenna Reflective Transponder for Tag

GaAs Monolithic Microwave IC

Description

The CHR2244 is a MMIC transponder dedicated to

short range communications at 5.8GHz. It includes all

the RF functions for bi-directional transmission and

CMOS compatible interfaces. Only one antenna is

necessary.

Three modes are implemented :

STANDBY : ultra low current AM detector, with a

reduced bandwidth, providing a wake-up signal on

SB_out output. This signal is a DC voltage. This

output is active when and only when an AM

modulated RF signal is applied to the RF input.

DOWNLINK

:

low

current

AM

detector,

with

optimized IF bandwidth, providing the demodulated

data at the CMOS compatible DATA_out output.

UPLINK : multiplier based on a passive reflective

mixer.

This circuit is manufactured on a MESFET process. It

is supplied in plastic package (QFN-24).

Main Features

n

5.8GHz ISM band operating frequency

n

CMOS compatible

n

Ultra low Standby current

n

Single bias voltage

n

Low cost & high performances plastic package

n

Lead-free, Matt Tin (Green) solder plating

Det

T/R

MOD WK_in

DATA_out

RF

External components

Vcc

SB_out

Transponder block diagram

Main Characteristics

Tamb = +25°C; Vcc = 3.1V

Symbol

Parameter

Min

Typ

Max

Unit

Vcc_sb_i

Standby DC current ( Without RF input

signal)

8

14

µA

RF_sb_p

RF_dl_p

Minimum power for Standby mode

Minimum power for Downlink mode

-39

-39

-43

-43

dBm

dBm

BW_dl

AM demodulation frequency (Downlink)

250

500

kHz

G_ul

Uplink multiplier gain (DSB)

-6.5

-4

dB

BW_ul

Uplink IF multiplier frequency band

0.1

10

MHz

ESD Protections : Electrostatic discharge sensitive device observe handling precautions !