Data Sheet

Conexant Proprietary

Doc. No. 101103A

Data Subject to Change

September 27, 2000

CX74037

Transmit RF IC for TDMA or AMPS Applications

Conexant’s CX74037 Transmit RF Application-Specific Integrated Circuit (ASIC) is

a triple-mode, dual-band transmitter intended for use in IS-136 compliant cellular

phones. As a dual mode IC, it can be used in Time Division Multiple Access

(TDMA) mode or Advanced Mobile Phone System (AMPS) mode. The device is

available in a 48-pin 7x7 Land Grid Array (LGA) package with downset paddle.

The CX74037 RF IC device includes the following functional components:

•

In-Phase and Quadrature (I/Q) modulator

•

Two Intermediate Frequency (IF) Voltage Controlled Oscillator (VCO) inputs

•

IF Variable Gain Amplifier (VGA)

•

Two upconverters

•

Two drivers for external Power Amplifiers (PAs).

The CX74037 48-pin, 7x7 LGA package pin configuration is shown in Figure 1. A

CX74037 block diagram is shown in Figure 2.

Features

• Sectional enable lines for independent control of

circuits within the chip

• 90 dB IF VGA range

• Separate IF frequencies can be used for the 800

MHz (AMPS) and 1900 MHz Bands (PCS)

• Dual drivers for 800 MHz and 1900 MHz

• PA driver is deactivated by using the Driver Enable

signal when there is no transmission

• Available in a 48-pin, 7x7 LGA package with

downset paddle

Applications

• Cellular and/or PCS-band phones

• TDMA and/or AMPS-mode phones

• Portable battery powered equipment

101103A-1_080400

NC

IF_VCO_IN1-

IF_VCO_IN1+

NC

NC

NC

VCC_DIV

MIX_CELL_OUT

PULL_ENA

VCC_DIFF_DRV

MIX_PCS_OUT

NC

NC

MIX_IN+

MIX_IN-

VCC_IF

VGA_GC

VGA_OUT-

VGA_OUT+

VCC_LD_PCS

POT_CELL

DRV_ENA

RF_PCS_OUT

VCC_BIAS

RF_CELL_OUT

BAND

1

2

3

4

5

6

7

8

9

10

11

12

13

35

34

33

32

31

30

29

28

27

26

25

36

37

45

46

47

48

44

43

42

41

40

39

38

17

16

15

14

18

19

20

21

22

23

24

Figure 1. CX74037 48-Pin, 7x7 LGA Package Pin Configuration