Rainbow Electronics MAX2644 User Manual

MAX2644

2.4GHz SiGe, High IP3 Low-Noise Amplifier

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

MAX2644

GND

BIAS

R

BIAS

1.2kΩ

RF OUTPUTRF INPUT

V

CC

V

CC

RFOUTRFIN

C1

33pF

L1

3.3nH

BIAS

Typical Operating Circuit

19-1786; Rev 0; 3/01

EVALUATION KIT MANUAL AVAILABLE

General Description

The MAX2644 low-cost, high third-order intercept point
(IP3) low-noise amplifier (LNA) is designed for applica­tions in 2.4GHz WLAN, ISM, and Bluetooth radio sys­tems. It features a programmable bias, allowing the
input IP3 and supply current to be optimized for specif­ic applications. The LNA provides up to +1dBm input
IP3 while maintaining a low noise figure of 2.0dB and a
typical gain of 16dB.

The MAX2644 is designed on a low-noise, advanced
silicon-germanium (SiGe) technology. It operates with a
+2.7V to +5.5V single supply and is available in an
ultra-small 6-pin SC70 package.

________________________Applications

Bluetooth

802.11 WLAN

Home RF

Satellite CD Radio

2.4GHz ISM Band Radios

2.4GHz Cordless Phones

Wireless Local Loop (WLL)

Features

♦ Low Noise Figure (2.0dB at 2450MHz)

♦ High Gain: 16dB

♦ Adjustable IP3 and Bias Current

♦ Low-Power Standby Mode

♦ On-Chip Output Matching

♦ +2.7V to +5.5V Single-Supply Operation

♦ Ultra-Small 6-Pin SC70 Package

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART TEMP. RANGE

MAX2644EXT-T -40°C to +85°C 6 SC70 AAG

PIN­PACKAGE

MARK

TOP

TOP VIEW

16RFOUT

BIAS

GND

2

34

RFIN

MAX2644

SC70-6

5 GND

V

CC

MAX2644

2.4GHz SiGe, High IP3 Low-Noise Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, R

BIAS

= 1.2kΩ, no RF signal applied, R

FIN

and R

FOUT

are AC-coupled and terminated to 50Ω, TA= -40°C to

+85°C. Typical values are at V

CC

= +3.0V, TA= +25 °C, unless otherwise noted.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Devices are production tested at TA= +25°C. Minimum and maximum values are guaranteed by design and characterization

over temperature and supply voltages.

Note 2: Min/Max limits are guaranteed by design and characterization.
Note 3: The part has been characterized at the specified frequency range. Operation outside this range is possible but not guaranteed.
Note 4: Excluding PC board losses (0.3dB at the input and 0.3dB at the output of the MAX2644 EV kit).
Note 5: Measured with two input tones (f

1

= 2445MHz, f2= 2455MHz) both at -30dBm per tone. Input IP3 can be improved to

+1dBm with circuit shown in Figure 2.

Note 6: Excluding PC board losses (0.3dB typical at the input of the MAX2644 EV kit).

V

CC

to GND ..............................................................-0.3V to +6V

RFIN, RFOUT to GND…......................................................±0.3V

RFIN Power (50Ω source) ................................................+5dBm

BIAS to GND ................................................................0 to +0.3V

Operating Temperature Range ...........................-40°C to +85°C

Maximum Junction Temperature .....................................+150°C

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW

Storage Temperature.........................................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

AC ELECTRICAL CHARACTERISTICS

(MAX2644 EV kit, VCC= +3.0V, f

RFIN

= 2450MHz, P

RFIN

= -30dBm, input and output are terminated to 50Ω, R

BIAS

= 1.2kΩ,

T

A

= +25°C, unless otherwise noted.) (Note 2)

Supply Voltage 2.7 5.5 V

Operating Supply Current

Standby Supply Current R

PARAMETER CONDITIONS MIN TYP MAX UNITS

R

= 3.9kΩ 2.7

BIAS

R

= 1.2kΩ, TA = +25°C 7.0 9.7

BIAS

R

= 1.2kΩ, TA = -40°C to +85°C 11.0

BIAS

= 750Ω 10.2

R

BIAS

is unconnected 6.5 µA

BIAS

mA

Operating Frequency (Note 3) 2400 2500 MHz

Gain (Note 4) 15 17 dB

Gain Variation Over Temperature TA = -40°C to +85°C ±0.7 ±1.0 dB

Input Third-Order Intercept Point
(Note 5)

Input 1dB Compression Point -13 dBm

Noise Figure (Note 6) 2.0 2.5 dB

Input Return Loss -15 dB

Output Return Loss -10 dB

Reverse Isolation -30 dB

PARAMETER CONDITIONS MIN TYP MAX UNITS

R

= 750Ω -4

BIAS

RBIAS = 1.2kΩ

BIAS = 3.9kΩ

R

-3

-8

dBm

MAX2644

2.4GHz SiGe, High IP3 Low-Noise Amplifier

_______________________________________________________________________________________ 3

Typical Operating Characteristics

(P

RFIN

= -30dBm, ZS= ZL= 50Ω, VCC= +3.0V, f

RFIN

= 2450MHz, R

BIAS

= 1.2kΩ, TA= +25°C, unless otherwise noted.)

0

4

2

8

6

12

10

14

2.5 3.5 4.03.0 4.5 5.0 5.5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX2644 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

TA = +25°C

TA = -40°C

TA = +85°C

R

BIAS

= 1.2kΩ

13

15

14

17

16

18

19

0.5 2.0 2.51.0 1.5 3.0 3.5 4.0

GAIN vs. R

BIAS

MAX2644 toc05

R

BIAS

(kΩ)

GAIN (dB)

TA = -40°C

TA = +85°C

TA = +25°C

-20

-14

-16

-18

-12

-10

-8

-6

-4

-2

0

2200 24002300 2500 2600 2700

INPUT AND OUTPUT RETURN LOSS

vs. FREQUENCY

MAX2644 toc06

FREQUENCY (MHz)

REVERSE ISOLATION (dB)

OUTPUT RETURN LOSS

R

BIAS

= 1.2kΩ

INPUT RETURN LOSS

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

2350 2400 2450 2500 2550

NOISE FIGURE vs. FREQUENCY

MAX2644 toc08

FREQUENCY (MHz)

NOSIE FIGURE (dB)

R

BIAS

= 1.2kΩ

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

-40 -15 10 35 60 85

NOISE FIGURE vs. TEMPERATURE

MAX2644 toc09

TEMPERATURE (°C)

NOSIE FIGURE (dB)

R

BIAS

= 1.2kΩ

10

13

12

11

14

15

16

17

18

19

20

2200 24002300 2500 2600 2700

GAIN vs. FREQUENCY

MAX2644 toc04

FREQUENCY (MHz)

GAIN (dB)

TA = -40°C

TA = +85°C

TA = +25°C

R

BIAS

= 1.2kΩ

-50

-40

-45

-30

-35

-25

-20

2200 24002300 2500 2600 2700

REVERSE ISOLATION vs. FREQUENCY

MAX2644 toc07

FREQUENCY (MHz)

REVERSE ISOLATION (dB)

TA = +25°C

TA = +85°C

R

BIAS

= 1.2kΩ

TA = -40°C

1

5

3

9

7

11

13

0.5 2.0 2.51.0 1.5 3.0 3.5 4.0

SUPPLY CURRENT vs. R

BIAS

MAX2644 toc02

R

BIAS

(kΩ)

SUPPLY CURRENT (mA)

TA = +25°C

TA = +85°C

TA = -40°C

12

15

14

13

16

17

18

19

20

21

22

2.5 3.53.0 4.0 4.5 5.0 5.5

GAIN vs. SUPPLY VOLTAGE

MAX2644 toc03

SUPPLY VOLTAGE (V)

GAIN (dB)

TA = +25°C

R

BIAS

= 1.2kΩ

TA = +85°C

TA = -40°C