RF2489 Ver la hoja de datos (PDF) - RF Micro Devices

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RF2489

DUAL-BAND/TRI-MODE CDMA LOW NOISE AMPLIFIER/MIXER

RF Micro Devices 

RF2489

Preliminary

Control Logic (Single VCO)

Mode

BAND SEL

Cellular FM

0

Cellular CDMA

0

PCS CDMA

1

Power Down

1

Power Down 2

X

TX Buffer Enabled

X

/2 Enabled

0

IF SEL

1

0

0

1

X

X

X

ENABLE

1

1

1

1

0

1

1

TX BUFF

ENABLE

X

X

X

X

X

1

X

/2 SELECT

1

1

X

X

X

X

1

Control Logic (Dual VCO)

Mode

Cellular FM

Cellular CDMA

PCS CDMA

Power Down

Power Down 2

TX Buffer Enabled

/2 Enabled

BAND SEL

0

0

1

1

X

X

0

IF SEL

1

0

0

1

X

X

X

ENABLE

1

1

1

1

0

1

1

TX BUFF

ENABLE

X

X

X

X

X

1

X

/2 SELECT

0

0

X

X

X

X

1

Application Note 1

8

The PCS TX LO output pin (pin 7) and the CELL TX LO output pin (pin 8) can be combined. When BAND SEL is set low,

the PCS band LO limiter and PCS TX LO buffer are off. Also, when BAND SEL is set high, the cellular band LO limiter

and frequency divider are off as well as the cellular TX LO buffer. The LO leakage through the path of the disabled LO

limiter/divider and TX LO buffer is insignificant.

Typical LO isolation test data follows:

LO Input Frequency=2128MHz, PIN=-4dBm, BAND SEL=0, /2 SELECT=1

POUTPIN8= -28dBm at 2128MHz

POUTPIN8= -11dBm at 1064MHz

POUTPIN7= -34dBm at 2128MHz

8-40

Rev A10 011017

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