Transmit RF IC for TDMA or AMPS Applications

CX74037

101103A

Conexant – Proprietary

3

September 27, 2000

Data Subject to Change

Table 1. CX74037 Signal Definition (1 of 2)

Pin NO.

Name

Description

1

Mix_IN+

Input to RF Upconverters. Internally AC coupled, high impedance.

2

Mix_IN-

Input to RF Upconverters. Internally AC coupled, high impedance.

3

VCC_IF

Supply voltage for the AGC amplifier.

4

VGA_GC

The input pin for AGC gain control. A DC control voltage should be applied to this pin to vary the gain of the IF amplifier.

5

VGA_OUT-

VGA Output, open collector. External resistive (300 ohms) pull up to Vcc required.

6

VGA_OUT+

VGA Output, open collector. External resistive (300 ohms) pull up to Vcc required.

7

VCC_LD_PCS

Supply voltage for the PCS last stage driver amplifier.

8

POT_CELL

This pin is connected to an external resistor. The value of the resistor will vary the bias current of the cellular driver.

9

DRV_ENA

This is the input pin for the upconverter and the driver control signal. When the pin is low the driver and the upconverter are

deactivated.

10

RF_PCS_OUT

Output pin for the PCS driver amplifier. Impedance matching is required.

11

VCC_BIAS

Supply voltage of bias cells.

12

RF_CELL_OUT

Output pin for the cellular driver amplifier. Impedance matching is required.

13

BAND

This is a control signal input pin. It selects between cellular band and PCS band. When the input is low, the cellular band is chosen.

When the input is high, the PCS band is chosen.

14

VCC_DRV_CEL

Supply voltage for the driver of the cellular band.

15

POT_PCS

This pin is connected to an external resistor. The value of the resistor will vary the bias current of the PCS driver.

16

VCC_MID_PCS

Supply voltage for the first amplifier in the PCS driver block.

17

DRV_CELL_IN

The Cellular driver amplifier input pin. Impedance matching is required.

18

DRV_PCS_IN

The PCS driver amplifier input pin. Impedance matching is required.

19

I_DATA+

The baseband input for I channel. This is a balanced input. A DC bias has to be supplied to the pin.

20

I_DATA-

Same as pin 20, except complementary input. This pin should be pull low (0 V) in FM mode.

21

VCC_MOD

Supply voltage for the I/Q modulator.

22

Q_DATA+

The baseband input for Q channel. This is a balanced input. A DC bias has to be supplied to the pin.

23

Q_DATA-

Same as pin 23, except complementary input.

24

NC

There is no connection on this pin. Should be tied to ground.

25

NC

There is no connection on this pin. Should be tied to ground.

26

NC

There is no connection on this pin. Should be tied to ground.

27

MIX_PCS_OUT

Output of the PCS upconverter. Impedance matching required.

28

VCC_DIFF_DRV

Supply voltage for a differential amplifier in the upconverter block.

29

PULL_ENA

This is a control signal input pin. When the input is low, the IF VCOs, RF Mixer and buffers, and divide by 2 sections will be

disabled. When the input is high, the mentioned sections will be enabled.

30

MIX_CELL_OUT

Output of the Cellular upconverter. Impedance matching required.

31

VCC_DIV

Supply voltage for the dividers and VCO buffer.

32

NC

There is no connection on this pin. Should be tied to ground.

33

NC

There is no connection on this pin. Should be tied to ground.

34

NC

There is no connection on this pin. Should be tied to ground.

35

IF VCO IN1+

Input pin for the modulator LO signal. The frequency is 2xIF. Can be used single-ended. AC ground the unused pin.

36

IF VCO IN1-

Input pin for the modulator LO signal. The frequency is 2xIF. Can be used single-ended. AC ground the unused pin.

37

NC

There is no connection on this pin. Should be tied to ground.

38

NC

There is no connection on this pin. Should be tied to ground.

39

MODE

This is a control signal input pin. When the input is low, the AMPS mode is selected. If the input is high, TDMA mode is selected. FM

output is 9 dB higher at the modulator output.

40

IF VCO IN2+

Input pin for the modulator LO signal. The frequency is 2xIF. Can be used single-ended. AC ground the unused pin.

41

IF VCO IN2-

Input pin for the modulator LO signal. The frequency is 2xIF. Can be used single-ended. AC ground the unused pin.

42

IF_SELECT

Control signal to select IF VCO INPUT1 or INPUT2. “1” will select IF VCO INPUT1 and “0” will select IF VCO INPUT2.