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Electrical Specifications
Table 3 shows the use of the Gain, Enable and Band pins (along with the Vcc and RF out pins), to select
Active mode (High Gain), Bypass mode (Low Gain), or Standby mode (Disable) operation.
Table 3. Truth Table
Enable
Disable
Pin Function
Pin Name
Low Gain High Gain Low Gain High Gain
Logic Circuit Bias Vcc
Toggles Gain Mode (Active or Bypass)
Toggles LNA On/Off
Selects the LNA
Vcc
Gain
Enable
Band
1
0
1
1
1
1
1
1
1
0
0
1
1
1
0
1
NOTES: 1. Logic state "1" equals Vcc voltage. Logic state of "0" equals ground potential.
2. Vcc is inductively coupled to LNA Out pin and Vcc pin.
3. Minimum logic state "1" for enable and gain pins is 1.25V.
4. Maximum logic state "0" for enable and gain pins is 0.8V.
Table 4 lists electrical characteristics associated with noise performance measured in a 50 Ω system.
Additional noise parameters are listed in Table 14 and Table 15 . Also listed are the typical Icc and RF
turn-on times for the device.
Table 4. Electrical Characteristics (Vcc = 2.75 V, Ta = 25 ° C)
Characteristic
Symbol
Min
Typ
Max
Unit
Insertion Gain
R1=1.2 k Ω , Freq=434 MHz
R1=1.2 k Ω , Freq=900 MHz
|S21| 2
20.4
16.4
21.9
18.3
—
dB
Maximum Stable Gain and/or Maximum Available Gain [Note1]
R1=1.2 k Ω , Freq=434 MHz
MSG, MAG
26.7
28.2
—
dB
R1=1.2 k Ω , Freq=900 MHz
Minimum Noise Figure
22
23.5
R1=1.2 k Ω , Freq=434 MHz
R1=1.2 k Ω , Freq=900 MHz
NFmin
—
0.92
0.84
1.2
1.1
dB
Associated Gain at Minimum Noise Figure
R1=1.2 k Ω , Freq=434 MHz
R1=1.2 k Ω , Freq=900 MHz
Gnf
27.6
21
29.6
23
—
dB
Icc and RF Turn On Time
Enable trigger total time of 1.8 usec from 0 to 2.75 V
Icc rise time from 0 to 76% of final current level
—
—
6.4
—
usec
Icc rise time from 0 to 87% of final current level
RF on time from leading edge of enable trigger to RF turn-on
9.6
1.37
NOTES: 1. Maximum Available Gain and Maximum Stable Gain are defined by the K factor as follows:
MAG=|S21/S12(K+/-sqrt(K2-1))|, if K>1,
MSG =|S21/S12|, if K<1
Table 5 lists the electrical characteristics measured on evaluation boards that are tuned for typical
application frequencies. Further details on the application circuits are shown in Section 4 ; details on the
boards are shown in Section 5 .
MC13852 Advance Information, Rev. 2.0
4
Freescale Semiconductor
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