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DESCRIPTION

BPF

BPF

T/R

T/R

T/R

T/R

A/B

A/B

ABSEL

TR

RXGC

RFANTA

RFANTB

IF

LO

DET

V+

2

PA

PA

T/R

PA

V+

V+

MXA

MXB

RFB

RFA

2

2

PABCA

PABCB

DEVICE INFORMATION

TRF2436

SLWS176 – APRIL 2005

The TRF2436 is a fully integrated Dual Band Tri Mode Radio Frequency Front End (RFFE) designed specifically

for use in 802.11 a/b/g applications. The TRF2436 is designed to perform RF up and down conversions in the

unlicensed ISM and 4.9-5.9 GHz bands. The TRF2436 uses a common IF frequency for both bands, eliminating

the need for additional IF filtering. Combined with the TI TRF2432 IF/IQ Transceiver/Synthesizer, the TRF2436

completes the TI WLAN two-chip radio.

The TRF2436 incorporates all of the RF blocks for both the “b/g” and “a” bands except for low cost ceramic

filters. The ASIC includes LNAs, PAs, mixers, bias circuitry, RX gain control, transmit coupler detectors, and T/R

switches. High integration and internal RF matching enhances performance and greatly reduce external part

count. The only external components needed (other than simple passives) for operation are RF filters and

external low power DC switching FETs.

Functional Block Diagram

TERMINAL FUNCTIONS

TERMINAL

I/O

TYPE

DESCRIPTION

NAME

NO.

MXB

1

I/O

RF SE

B band RF Input/Output to mixer. 50-

Ω single ended. Do not apply DC.

ABSEL

2

I

Digital

Band select pin. HIGH = A-band. LOW = B-band.

V+LOB

3

I

Power

B band LO amplifier bias +3.3V

RSVD1

4

-

-

Not connected for normal operation. Leave Open.

LOP

5

I

RF Dif.

LO input (differential) Positive, AC coupled

LON

6

I

RF Dif.

LO input (differential) Negative, AC coupled

IFP

7

I/O

RF Dif.

IF input/output (differential) Positive, DC coupled, typical DC Voltage is 2.6V

IFN

8

I/O

RF Dif.

IF input/output(differential) Negative, DC coupled, typical DC Voltage is 2.6V

MXA

9

I/O

RF SE

A band RF Input/Output to mixer. 50-

Ω single ended. Do not apply DC.

2