MAX2644 datasheet(4/8 Pages) MAXIM

Part #	MAX2644

Description	2.4GHz SiGe, High IP3 Low-Noise Amplifier

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Manufacturer	MAXIM [Maxim Integrated Products]

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4 / 8 page

2.4GHz SiGe,

High IP3 Low-Noise Amplifier

4

_______________________________________________________________________________________

Pin Description

NAME

DESCRIPTION

1

BIAS

Resistor Bias Control. Connect a resistor, RBIAS, from BIAS to ground. RBIAS sets IP3 and supply

current. The current through this pin is approximately 60mV divided by RBIAS (see Applications

Information).

2, 5

GND

Ground. For optimum performance, provide a low-inductance connection to the ground plane.

3

RFIN

Amplifier Input. AC-couple to this pin with a DC blocking capacitor. External matching network is

required for optimum performance.

4VCC

Supply Voltage. Bypass with a capacitor directly to ground at the supply pin. Refer to VCC Line

Bypassing section for more information.

6

RFOUT

Amplifier Output. AC-coupled internally.

Typical Operating Characteristics (continued)

(PRFIN = -30dBm, ZS = ZL = 50

Ω, VCC = +3.0V, fRFIN = 2450MHz, RBIAS = 1.2kΩ, TA = +25°C, unless otherwise noted.)

-20

-10

-15

0

-5

5

10

-30

-20

-15

-25

-10

-5

0

OUTPUT POWER vs. INPUT POWER

INPUT POWER (dBm)

RBIAS = 750

Ω

RBIAS = 1.2k

Ω

RBIAS = 3.9k

Ω

IIP3 vs. RBIAS

-9

-8

-6

-7

-3

-2

-4

-5

-1

0.5

1.5

2.0

1.0

2.5

3.0

3.5

4.0

RBIAS (k

Ω)

TA = +85

°C

TA = +25

°C

TA = -40

°C

INPUT P1dB vs. RBIAS

-19

-18

-16

-17

-13

-12

-14

-15

-11

0.5

1.5

2.0

1.0

2.5

3.0

3.5

4.0

RBIAS (k

Ω)

TA = +85

°C

TA = -40

°C

TA = +25

°C

U1

MAX2644

SMA

RFIN

SMA

RFOUT

C1

33pF

L1

3.3nH

3

2

1

R1

1.2k

Ω

6

5

4

VCC

GND

C3

2.2pF

Length = 400mils

C2

33pF

VCC

GND

RFIN

GND

RFOUT

BIAS

GAIN: 17dB

IIP3: -3dBm

Figure 1. High Gain Design

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