SA2421 Datasheet, PDF (2/12 Pages) NXP Semiconductors – 2.45 GHz low voltage RF transceiver

Philips Semiconductors
2.45 GHz low voltage RF transceiver
Product specification
SA2421
DESCRIPTION
The SA2421 transceiver is a combined low–noise amplifier, receive
mixer, transmit mixer and LO buffer IC designed using a 20 GHz f_T
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
• Low current consumption: 34 mA nominal transmit mode and
20 mA nominal receive mode
• High system power gain: 24 dB (LNA + Mixer) at 2.45 GHz
• Excellent gain stability versus temperature and supply voltage
• Separate Rx IN and Tx OUT pins
• Wide IF range: 50–500 MHz
• –10dBm typical LO input power
• Improved LNA reverse isolation S12
• TSSOP24 package
PIN CONFIGURATION
DH Package
GND 1
LNA IN 2
GND 3
GND 4
Rx IF OUT 5
Rx IF OUT 6
Tx IF IN 7
Tx IF IN 8
GND 9
LOP 10
Tx/Rx 11
LOM 12
24 ^VCC
23 LNA OUT
22 GND
21 ATTEN SW
20 GND
19 Rx IN
18 GND
17 Tx OUT
16 GND
15 GND
14 VCC LO
13 CHIP EN
SR01756
Figure 1. Pin configuration
APPLICATIONS
• IEEE 802.11 (WLAN)
• 2.45 GHz ISM band
ORDERING INFORMATION
DESCRIPTION
24-Pin Plastic Thin Shrink Small Outline Package (Surface-mount, TSSOP)
TEMPERATURE RANGE
–40°C to +85°C
ORDER CODE
SA2421DH
DWG #
SOT355-1
BLOCK DIAGRAM
LNA
V_CC
OUT
24
23
GND
22
ATTEN
SW
21
GND
20
Rx IN
19
GND
18
Tx OUT
17
GND
16
V_CC
GND
LO
15
14
CHIP
EN
13
ATTENUATOR
LNA
RX
PRE-DRIVER
BPF
RX
TX
LO
BUFFER ^X1
1
2
3
4
5
6
7
8
9
10
11
12
GND
LNA
GND
GND
IN
Rx IF
OUT
Rx IF
OUT
Tx IF
IN
Tx IF
IN
GND
Figure 2. SA2421 block diagram
LOP
Tx/Rx
LOM
SR01757
2000 Mar 13
2
853-2189 23308