Electrical Specifications

MC13851 Advance Information, Rev. 2.0

4

Freescale Semiconductor

Table 3 shows the use of the Gain and Enable pins to select Active mode (High Gain), Bypass mode (Low

Gain) or Standby mode (Disable) operation.

Table 4 lists the electrical characteristics associated with noise performance measured in a 50

Ω system.

Additional noise parameters are listed in Table 15 and Table 16. Also listed are the typical Icc and RF turn

on times for the device. Information and details on the boards are shown in Section 4, “Printed Circuit and

Bill of Materials.”

Logic voltage

Input high voltage

Input low voltage

—1.25

0

1.8

0

0.80

Vdc

Vdc

Table 3. Truth Table

Pin Function

Pin Name

Enable

Disable

Low Gain

High Gain

Low Gain

High Gain

Logic Circuit Bias Vcc

Vcc

1

1

1

1

Toggles Gain Mode (Active or Bypass)

Gain

0

1

0

1

Toggles LNA On/Off

Enable

1

1

0

0

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. Electrical Characteristics (Vcc = 2.75 V, Ta = 25°C)

Characteristic

Symbol

Min

Typ

Max

Unit

Insertion Gain

dB

R1=1.2 k

Ω, Freq=1.575 GHz

17.4

18.9

—

R1=1.2 k

Ω, Freq=2.14 GHz

14.5

16

—

R1=1.5 k

Ω, Freq=1.575 GHz

16.4

17.9

—

R1=1.5 k

Ω, Freq=2.14 GHz

14.9

16.4

—

Maximum Stable Gain and/or Maximum Available Gain [Note1]

MSG, MAG

dB

R1=1.2 k

Ω, Freq=1.575 GHz

21.1

22.6

—

R1=1.2 k

Ω, Freq=2.14 GHz

19.6

21.1

—

R1=1.5 k

Ω, Freq=1.575 GHz

19

20.5

—

R1=1.5 k

Ω, Freq=2.14 GHz

18.1

19.6

—

Minimum Noise Figure

NFmin

dB

R1=1.2 k

Ω, Freq=1.575 GHz

—

0.97

1.3

R1=1.2 k

Ω, Freq=2.14 GHz

—

1.07

1.4

R1=1.5 k

Ω, Freq=1.575 GHz

—

0.98

1.3

R1=1.5 k

Ω, Freq=2.14 GHz

—

1.1

1.4

Table 2. Recommended Operating Conditions (continued)

Characteristic

Symbol

Min

Typ

Max

Unit