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RF2498
Rev A3 DS030711
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Cascaded Performance (Typical Values for VCC=2.75V)
NOTE: All total current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode).
Cellular CDMA Gain Control
PCS CDMA
LNA ON
LNA OFF
LNA ON
LNA OFF
Parameter
LNA at Max IIP3, IPSET=1
Mixer Preamp ON
Mixer Preamp OFF
Cascaded:
Gain (dB)
26.5
7
17.0
-2.5
Noise Figure (dB)
2.2
14
5.0
22
Input IP3 (dBm)
-7.5
+11.8
+0.2
+19.0
LO to IF Isolation (dB)
40
40
40
40
IF1 to RF Isolation (dB)
40
40
40
40
IF2 to RF Isolation (dB)
40
40
40
40
LO to LNA IN Isolation (dB)
40
40
40
40
Total Current (mA)
*27.5
21.0
*22.5
16.0
NOTE: Assumes 3dB image filter insertion loss. The TX Buffer Enable is off. Div/2 function is off.
Numbers represent high linearity LNA bias setting IPSET=1.
*For Paging mode set IPSET=0. Total current reduced 2mA.
Parameter
GPS
Cascaded:
High IIP3 LNA Mode, IPSET=1
IPSET=0
Gain (dB)
35.5
34.5
Noise Figure (dB)
1.6
1.6
Input IP3 (dBm)
-23.0
-22.0
Total Current (mA)
24
22
NOTE: Assumes 1.5dB image filter insertion loss. The TX Buffer
Enable is off. /2 Select is off.
Mode
LNA GAIN
MIX GAIN
Comments
High Gain
1
1
IMD Test 1 and 2
Mid Gain
1
0
IMD Test 3 and 4
Low Gain
0
1
IMD Test 5 and 6 option 1
Ultra Low Gain
0
0
IMD test 5 and 6 option 2
Note: Contact RFMD for Application note on gain control PCBA layout and software recommendations.
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