RF2469PCBA View Datasheet(PDF) - RF Micro Devices
Part Name
Description
MFG CO.
'RF2469PCBA' PDF : 18 Pages View PDF
RF2469
Preliminary
Low Current Configuration
External resistors can set different bias currents for LNA1 (pin 3), LNA2 (pin 4, also called the preamplifier of the mixer),
and mixer (pin 17). Customers have the flexibility to choose the most suitable bias current, and therefore the perfor-
mance, of the IC. The charts on the following page reflect different bias currents for the RF2469.
The currents were calculated using the following equations.
LNA1 current (R1)=Total Current (LNA1=EN=1, LNA2=0)-Total Current (EN=1, LNA1=LNA2=0)+1.6
1.6 is the bypass current of LNA1
Mixer/LNA2 current (R2)=Total Current (LNA1=0, LNA2=EN=1)-Total Current (LNA1=LNA2=0, EN=1)+1.4+10.2
1.4 is the bypass current of LNA2; 10.2 is the mixer (LO buffer included)
Mixer Only current (R5)=Total Current (EN=LNA2=1, LNA1=0)-4.5
4.5 is the bypass current of the LNA1 (1.6mA)+LNA2 high mode current (2.9mA)
RFMD chose a low current configuration of the RF2469, by using R1=3kΩ, R2=3.6kΩ, and R5=1kΩ in the evaluation
board, and the following lab results over temperature were obtained.
LNA1 High Mode
Temp
(°C)
Frequency
(MHz)
PIN
(dBm)
VCC
(VDC)
-30
2140
-25
2.78
+25
2140
-25
2.78
8
+85
2140
-25
2.78
Total Current (mA) is when LNA1BYP=LNA2BYP2=EN =1.
Gain
(dB)
+7.97
+8.81
+9.70
IIP3
(dBm)
-3.78
+2.32
+7.71
Noise Figure
(dB)
+1.72
+1.95
+2.37
Total
Current
+11.33
+12.36
+16.45
Mixer/LNA2 BYP High Mode
Temp
(°C)
Frequency
(MHz)
PIN
(dBm)
-30
2140
-25
+25
2140
-25
+85
2140
-25
LO Frequency
(MHz)
2330
2330
2330
PIN LO
(dBm)
-10
-10
-10
VCC
(VDC)
2.78
2.78
2.78
Gain
(dB)
+18.73
+17.74
+16.67
IIP3
(dBm)
-8.16
+5.13
-3.66
Noise Figure
(dB)
+3.98
+4.54
+5.19
8-48
Rev A5 010717
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