CX74036

Receive RF IC

4

Conexant – Proprietary

101105A

Data Subject to Change

October 17, 2000

MSB

00 = First bit shifted in (LSB)

35 = Last bit shifted in (M SB)

VRS = Select VCO or Reference Input to Programm able Counter

"0" = Reference Input

"1" = VCO Input

M B0 - M B7: Program m ing for Synthesizer M Counter: M B0 (LSB), M B7 = (M SB)

AB0 - AB3: Program m ing for Synthesizer A Counter: AB0 (LSB), AB7 = (M SB)

RB0 - RB10: Program m ing for Synthesizer R Counter: RB0 (LSB), RB10 = (M SB). CPP = Change Pum p Polarity,

"0" = Ground Reference

M 2B0 - M 2B7: Program m ing for LO Divider M Counter: M 2B0 (LSB), M 2B7 = (M SB)

A2B0 - A2B7: Program m ing for LO Divider A Counter: A2B0 (LSB), A2B1 = (M SB)

SPD = Synthesizer Power Down (for External Synthesizer M ode)

"1" = Internal Synthesizer,

"0"= External Synthesizer

SPD

35

A2B0

33

M2B7

32

M2B6

31

M2B5

30

A2B1

34

M2B4

29

M2B2

27

M2B1

26

M2B0

25

CPP

24

M2B3

28

RB10

23

RB8

21

RB7

20

RB6

19

RB5

18

RB9

22

RB4

17

RB2

15

RB1

14

RB0

13

AB3

12

RB3

16

AB2

11

AB0

09

MB7

08

MB6

07

MB5

06

AB1

10

MB4

05

MB2

03

MB1

02

MB0

01

VR S

00

MB3

04

LSB

101105A-4_101200

Figure 4. 3-Wire Programming Data Pattern

Table 3. Signal Pin Names and Definitions (1 of 2)

Pin No.

Signal Name

Description

1

LNA_G

LNAs gain control command

2

MXIH

1900 MHz band mixer Input

3

MIXIL

800 MHz band mixer Input

4

BAND

800 MHz/1900 MHz band select command

5

CHIP_EN

Chip power down select command

6

LOIH

1900 MHz RF mixer LO input

7

LOIL

800 MHz RF mixer LO input

8VCC_MX

RF mixer VCC

9

STANDBY

Control signal to enable RF LO buffers and VHF synthesizer

10

IQ/IF

I/Q or IF output select command

11

MXOUT+

RF mixer output. Open Collector.

12

MXOUT-

RF mixer output. Open Collector.

13

MX2I+

IF mixer input

14

MX2I-

IF mixer input

15

VCC_IF

IF section VCC

16

IFBYPASS

IF mixer bias decoupling

17

MX2OUT

IF mixer output

18

Vvga

Analog voltage input for VGA gain control

19

VCC_VGA

VGA section VCC

20

VGAI-

VGA input

21

VGAI+

VGA input

22

FB_CAP

VGA DC feedback filter capacitor connection

23

LATCH_EN

Enable input line for internal synthesizer programming

24

CLK

Serial clock input line for internal synthesizer programming

25

DATA

Serial data input line for internal synthesizer programming

26

REFIN

19.44 MHz reference oscillator input. Requires VCC/2 DC bias.