Philips Semiconductors

Product specification

SA2421

2.45 GHz low voltage RF transceiver

2

2000 Mar 13

853-2189 23308

DESCRIPTION

The SA2421 transceiver is a combined low–noise amplifier, receive

BiCMOS process, QUBiC2, for high–performance low–power

communication systems for 2.4–2.5 GHz applications. The LNA has

a 3.2 dB noise figure at 2.45 GHz with 14.3 dB gain and an IP3

intercept of –3 dBm at the input. The wide–dynamic–range receive

mixer has a 11.2 dB noise figure and an input IP3 of +2.5 dBm at

2.45 GHz. The nominal current drawn from a single 3 V supply is

34 mA in transmit mode and 20 mA in receive mode. The SA2421

differs from the SA2420 by removal of the LO doubler and LO

switch. The LNA reverse isolation is improved, and a separate pin is

allocated for the transmit output.

FEATURES

20 mA nominal receive mode

PIN CONFIGURATION

1

2

3

4

5

6

7

8

9

10

11

12

13

14

24

23

22

21

20

19

18

17

16

15

DH Package

ATTEN SW

Tx OUT

GND

Rx IN

GND

GND

GND

LNA OUT

GND

GND

Rx IF OUT

GND

LOP

LNA IN

GND

GND

Rx IF OUT

Tx IF IN

Tx IF IN

Tx/Rx

LOM

CHIP EN

SR01756

Figure 1.

Pin configuration

APPLICATIONS

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

24-Pin Plastic Thin Shrink Small Outline Package (Surface-mount, TSSOP)

–40

°C to +85°C

SA2421DH

SOT355-1

BLOCK DIAGRAM

4

3

2

15

24

23

22

21

20

7

610

9

8

19

18

17

16

15

Tx/Rx

GND

LOP

GND

Rx IN

GND

ATTEN

SW

CHIP

EN

GND

GND

LNA

OUT

GND

LNA

GND

GND

12

11

14

13

LOM

LO

Tx OUT

GND

LNA

IN

Rx IF

OUT

Rx IF

OUT

Tx IF

IN

Tx IF

IN

RX

RX

TX

LO

BUFFER

BPF

PRE-DRIVER

ATTENUATOR

SR01757

X1

Figure 2.

SA2421 block diagram