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RF137

Transceiver For GSM Applications

Conexant Systems 

RF137

Transceiver For GSM Applications

The RF137 Transceiver is a highly integrated device optimized for use in single-

band or multi-band Global System for Mobile Communications (GSM) applications.

In the receive path, the device consists of selectable gain Intermediate Frequency

(IF) amplifiers and an image reject downconverter with differential IF outputs.

In the transmit path, the device consists of an In-Phase and Quadrature (I/Q)

modulator and a frequency translational loop designed to perform frequency up-

conversion with high output spectral purity. This loop has a phase/frequency

detector, a charge-pump, a mixer, and buffers for the required isolation between

RF output, Local Oscillator (LO), and IF inputs.

In addition, the RF137 features an on-chip, dual-loop UHF/VHF frequency

synthesizer circuit. It includes two sets of reference dividers, phase/frequency

detectors, charge pumps, prescalers, main dividers, and control circuits.

The device package and pinout of the RF137 are shown in Figure 1. A block

diagram is shown in Figure 2.

The signal pin assignments and functional pin descriptions are found in Table 1.

The absolute maximum ratings of the device are provided in Table 2, and the

operating conditions and electrical specifications are provided in Table 3.

Features

• Image-reject mixer for downconversion to 2nd IF

• 24 dB selectable attenuation on 1st IF amplifier

• 12 dB selectable attenuation on 2nd IF amplifier

• Integrated transmit path with high phase accuracy

• Reduced filtering requirements for the transmit path

• Wide RF and IF range for multi-band operation

• Integrated, fully programmable dual loop

synthesizer

• Integrated local oscillator phase shifters

• On-chip second local oscillator

• Low supply voltage down to 2.7 V

• Separate enable lines for transmit, receive, and

synthesizer modes for power management

• 48-pin Thin Quad Flat Pack (TQFP) (7mm x 7mm)

package

Applications

• GSM900/DCS1800/PCS1900 digital cellular

telephony

Data Sheet

GND

1

TLCPO

2

VCCB

3

VCC

4

GND

5

T X IF IN +

6

T X IF IN -

7

GND

8

TXI+

9

TXI-

10

TXQ+

11

TXQ-

12

36

BPC

35

GND

34

VCC

33

RES1

32

RES2

31

VCC

30

GND

29

IF 2 IN +

28

IF 2 IN -

27

IF 2 O +

26

IF 2 O -

25

LD

100777C-1_100500

Figure 1. RF137 Pinout – 48-Pin TQFP

Conexant - Proprietary

Data Subject to Change

Doc. No. 100777C

October 11, 2000

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