RF2489
Control Logic (Single VCO)
TX BUFF
ENABLE
Mode
BAND SEL
IF SEL
ENABLE
/2 SELECT
Cellular FM
0
0
1
1
X
X
0
1
0
0
1
X
X
X
1
1
1
1
0
1
1
X
X
X
X
X
1
X
1
1
X
X
X
X
1
Cellular CDMA
PCS CDMA
Power Down
Power Down 2
TX Buffer Enabled
/2 Enabled
Control Logic (Dual VCO)
TX BUFF
ENABLE
Mode
BAND SEL
IF SEL
ENABLE
/2 SELECT
Cellular FM
0
0
1
1
X
X
0
1
0
0
1
X
X
X
1
1
1
1
0
1
1
X
X
X
X
X
1
X
0
0
X
X
X
X
1
Cellular CDMA
PCS CDMA
Power Down
Power Down 2
TX Buffer Enabled
/2 Enabled
Application Note 1
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
P
OUTPIN8=-11dBm at 1064MHz
POUTPIN7=-34dBm at 2128MHz
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A21 DS070308
9 of 30
RFMD [ RF MICRO DEVICES ]
