CX74037 데이터 시트보기 (PDF) - Conexant Systems

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CX74037

Transmit RF IC for TDMA or AMPS Applications

Conexant Systems 

Transmit RF IC for TDMA or AMPS Applications

CX74037

Table 1. CX74037 Signal Definition (1 of 2)

Pin NO.

1

2

3

4

5

6

7

8

9

Name

Mix_IN+

Mix_IN-

VCC_IF

VGA_GC

VGA_OUT-

VGA_OUT+

VCC_LD_PCS

POT_CELL

DRV_ENA

10

RF_PCS_OUT

11

VCC_BIAS

12

RF_CELL_OUT

13

BAND

14

VCC_DRV_CEL

15

POT_PCS

16

VCC_MID_PCS

17

DRV_CELL_IN

18

DRV_PCS_IN

19

I_DATA+

20

I_DATA-

21

VCC_MOD

22

Q_DATA+

23

Q_DATA-

24

NC

25

NC

26

NC

27

MIX_PCS_OUT

28

VCC_DIFF_DRV

29

PULL_ENA

30

MIX_CELL_OUT

31

VCC_DIV

32

NC

33

NC

34

NC

35

IF VCO IN1+

36

IF VCO IN1-

37

NC

38

NC

39

MODE

40

IF VCO IN2+

41

IF VCO IN2-

42

IF_SELECT

Description

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

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

Supply voltage for the AGC amplifier.

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.

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

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

Supply voltage for the PCS last stage driver amplifier.

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

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.

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

Supply voltage of bias cells.

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

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.

Supply voltage for the driver of the cellular band.

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

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

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

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

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

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

Supply voltage for the I/Q modulator.

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

Same as pin 23, except complementary input.

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

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

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

Output of the PCS upconverter. Impedance matching required.

Supply voltage for a differential amplifier in the upconverter block.

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.

Output of the Cellular upconverter. Impedance matching required.

Supply voltage for the dividers and VCO buffer.

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

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

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

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

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

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

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

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.

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

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

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

101103A

Conexant – Proprietary

3

September 27, 2000

Data Subject to Change

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