MAXIM MAX2242 Technical data

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General Description

The MAX2242 low-voltage linear power amplifier (PA) is
designed for 2.4GHz ISM-band wireless LAN applica­tions. It delivers +22.5dBm of linear output power with
an adjacent-channel power ratio (ACPR) of <-33dBc
1st-side lobe and <-55dBc 2nd-side lobe, compliant
with the IEEE 802.11b 11MB/s WLAN standard with at
least 3dB margin. The PA is packaged in the tiny 3x4
chip-scale package (UCSP™), measuring only 1.5mm x

2.0mm, ideal for radios built in small PC card and com­pact flash card form factors.

The MAX2242 PA consists of a three-stage PA, power
detector, and power management circuitry. The power
detector provides over 20dB of dynamic range with
±0.8dB accuracy at the highest output power level. An
accurate automatic level control (ALC) function can be
easily implemented using this detector circuit.

The PA also features an external bias control pin.
Through the use of an external DAC, the current can be
throttled back at lower output power levels while main­taining sufficient ACPR performance. As a result, the
highest possible efficiency is maintained at all power
levels. The device operates over a single +2.7V to
+3.6V power-supply range. An on-chip shutdown fea­ture reduces operating current to 0.5µA, eliminating the
need for an external supply switch.

________________________Applications

IEEE 802.11b DSSS Radios

Wireless LANs

HomeRF

2.4GHz Cordless Phones

2.4GHz ISM Radios

Features

♦ 2.4GHz to 2.5GHz Operating Range

♦ +22.5dBm Linear Output Power (ACPR of <-33dBc

1st-Side Lobe and <-55dbc 2nd-Side Lobe)

♦ 28.5dB Power Gain

♦ On-Chip Power Detector

♦ External Bias Control for Current Throttleback

♦ +2.7V to +3.6V Single-Supply Operation

♦ 0.5µA Shutdown Mode

♦ Tiny Chip-Scale Package (1.5mm

✕

2.0mm)

MAX2242

2.4GHz to 2.5GHz Linear Power Amplifier

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

19-1912; Rev 3; 11/03

EVALUATION KIT

AVAILABLE

Ordering Information

Typical Application Circuit appears at end of data sheet.

Actual Size

1.5mm

✕

2.0mm

UCSP is a trademark of Maxim Integrated Products, Inc.

PART TEMP RANGE

MAX2242EBC-T -40°C to +85°C3

GNDRF_IN

B4C4

C3

V

CCB

BIAS

CIRCUIT

PIN-

PACKAGE

✕ 4 UCSP AAE

V

CC1

A4

GND

A3

MARK

TOP

PD_OUT

B2

DET

B1C1

RF_OUTBIAS

3✕4 UCSP

A2

A1

GND

SHDN

C2

V

CC2

MAX2242

2.4GHz to 2.5GHz
Linear Power Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +3.6V, fIN= 2.4GHz to 2.5GHz, V

SHDN

= VCC, RF_IN = RF_OUT = connected to 50Ω load, TA= -40°C to +85°C.

Typical values are measured at V

CC

= +3.3V, fIN= 2.45GHz, 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.

V

CC1

, V

CC2

to GND (no RF signal applied) ..........-0.3V to +5.5V

RF Input Power ...............................................................+10dBm

SHDN, BIAS, PD_OUT, RF_OUT................-0.3V to (V

CC

+ 0.3V)

DC Input Current at RF_IN Port.............................-1mA to +1mA

Maximum VSWR Without Damage ........................................10:1

Maximum VSWR for Stable Operation.....................................5:1

Continuous Power Dissipation (T

A

= +85°C)

3

✕

4 UCSP (derate 80mW/°C above +85°C) ..................1.6W

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

Thermal Resistance .........................................................25°C/W

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

Storage Temperature Range .............................-65°C to +125°C

Lead Temperature (soldering, 10s) .................................+260°C

Continuous Operating Lifetime.....................10yrs × 0.92

(TA- 60°C)

(For Operating Temperature, TA≥ +60°C)

CAUTION! ESD SENSITIVE DEVICE

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Voltage 2.7 3.6 V

Supply Current
(Notes 2, 3, 6)

Shutdown Supply Current V

Logic Input Voltage High 2.0 V

Logic Input Voltage Low 0.8 V

Logic Input Current High -1 5 µA

Logic Input Current Low -1 1 µA

P

= +22dBm, VCC = +3.3V, idle current = 280mA

OUT

P

= +13dBm, idle current = 55mA 90

OUT

= +5dBm, idle current = 25mA 50

P

OUT

= 0, no RF input 0.5 10 µA

SHDN

300 335

mA

MAX2242

2.4GHz to 2.5GHz

Linear Power Amplifier

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2242 Evaluation Kit, VCC= +3.3V, V

SHDN

= VCC, 50Ω source and load impedance, fIN= 2.45GHz, TA= +25°C, unless other-

wise noted.) (Note 6)

Note 1: Specifications over T

A

= -40°C to +85°C are guaranteed by design. Production tests are performed at TA= +25°C.

Note 2: Idle current is controlled by external DAC for best efficiency over the entire output power range.
Note 3: Parameter measured with RF modulation based on IEEE 802.11b standard.
Note 4: Power gain is guaranteed over this frequency range. Operation outside this range is possible, but is not guaranteed.
Note 5: Output two-tone third-order intercept point (OIP3) is production tested at T

A

= +25°C. The OIP3 is tested with two signals at

f1 = 2.450GHz and f2 = 2.451GHz with fixed P

IN

.

Note 6: Min/max limits are guaranteed by design and characterization.
Note 7: The total turn-on and turn-off times required for PA output power to settle to within 0.5dB of the final value.
Note 8: Excludes PC board loss of approximately 0.15dB.
Note 9: See Typical Operating Characteristics for statistical variation.

Frequency Range (Notes 3, 4) 2.4 2.5 GHz

Power Gain (Notes 1, 3)

Gain Variation Over Temperature
(Note 3)

Gain Variation Over V
(Note 3)

Output Power (Notes 3, 5, 8)

Saturated Output Power

Harmonic Output (2f, 3f, 4f) -40 dBc

Input VSWR Over full PIN range 1.5:1

Output VSWR Over full P

Power Ramp Turn-On Time
(Note 7)

Power Ramp Turn-Off Time
(Note 7)

RF Output Detector Response
TIme

RF Output Detector Voltage

PARAMETER CONDITIONS MIN TYP MAX UNITS

TA = +25°C 26.5 28.5

T

A

T

A

(±10%)

CC

V

CC

ACPR,

st-side lobe < -33dBc,

1

nd-side lobe < -55dBc

2

P

IN

SHDN from low to high 1 1.5 µs

SHDN from high to low 1 1.5 µs

Po = +22dBm (Note 9) 1.8

Po = +13dBm (Note 9) 0.9

P

o

= -40°C to +85°C 25.5

= -40°C to +85°C ±1.2 dB

= +3.0V to +3.6V ±0.3 dB

21.5 22.5 dBm

= +5dBm

range 2.5:1

OUT

= +5dBm (Note 9) 0.55

26.5 dBm

2.5 5 µs

dB

V