RF25A-12 Ver la hoja de datos (PDF) - Conexant Systems

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RF25A-12

RF25A for CDMA, and AMPS Applications

Conexant Systems 

Rx ASIC

Pin #

Name

21

VGA_CONTROL

Table 1. RF25A Pin Assignments and Signal Descriptions (2 of 3)

Description

VGA voltage input. Input impedance is greater than 50K Ω.

RF25A

Equivalent Circuit

22

VCC_IF

Voltage supply to VGA and I/Q demodulator stages. Supply should be well regulated and

bypassed to prevent modulation of the signal by the supply ripple.

23

VGA_CDMA_IN+

CDMA differential VGA input

+

–

24

VGA_CDMA_IN-

CDMA differential VGA input

25

VGA_AMPS_IN

AMPS VGA input.

26

MIX_BYPASS

Low frequency bypass for the amps mixer.

27

CDMA_MIXEROUT+ CDMA differential mixer output. Requires an external inductor to VCC. An external match sets +

output impedance.

–

28

CDMA_MIXEROUT-

CDMA differential mixer output. Requires an external inductor to VCC. An external match sets

output impedance.

29

AMPS_MIXEROUT

AMPS mixer output. Requires an external inductor to VCC. An external match sets output

Vcc

impedance.

30

NC

31

NC

32

LO_IN

No connection.

No connection.

The mixer local oscillator input drive is typically –10 dBm.

33

NC

No connection.

101110A

Conexant – Preliminary

5

August 4, 2000

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