MAX2242EBC+T Maxim Integrated Products, MAX2242EBC+T Datasheet - Page 6

• Manufacturer Part Number: MAX2242EBC+T
• Description: RF Amplifier 2.4GHz to 2.5GHz Lin ear Power Amplifier
• Manufacturer: Maxim Integrated Products
• Type: Power Amplifierr

Specifications of MAX2242EBC+T

• Operating Frequency: 2500 MHz
• Supply Current: 300 mA
• Maximum Power Dissipation: 1600 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: UCSP
• Minimum Operating Temperature: - 40 C
• Number Of Channels: 1 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX2242 is a linear PA intended for 2.4GHz ISM-
band wireless LAN applications. The PA is fully charac-
terized in the 2.4GHz to 2.5GHz ISM band. The PA
consists of two driver stages and an output stage. The
MAX2242 also features an integrated power detector
and power shutdown control mode.
The MAX2242 is designed to provide optimum power-
added efficiency (PAE) in both high and low power
applications. For a +3.3V supply at high output power
level, the output power is typically +22.5dBm with an
idle current of 280mA. At low output-power levels, the
DC current can be reduced by an external DAC to
increase PAE while still maintaining sufficient ACPR
performance. This is achieved by using external resis-
tors connected to the BIAS pin to set the bias currents
of the driver and output stages. The resistors are typi-
cally 8kΩ. Typically, a DAC voltage of 1.0V will give a
280mA bias current. Increasing the DAC voltage will
decrease the idle current. Similarly, decreasing the
DAC voltage will increase the idle current.
The BIAS pin is maintained at a constant voltage of
1.0V, allowing the user to set the desired idle current
using only two off-chip 1% resistors: a shunt resistor,
R2, from BIAS to ground; and a series resistor, R1, to
2.4GHz to 2.5GHz
Linear Power Amplifier
6
_______________________________________________________________________________________
PIN
C4
A1
A2
A3
A4
B1
B2
B4
C1
C2
C3
PD_OUT
RF_OUT
NAME
SHDN
RF_IN
V
GND
V
GND
V
GND
BIAS
CCB
CC2
CC1
Detailed Description
Dynamic Power Control
3
2
3
1
RF Output. Requires external matching.
Power Detector Output. This output is a DC voltage indicating the PA output power. Connect a
47kΩ resistor to GND.
1
Bias Control. Connect one 8kΩ resistor from BIAS to GND and one 8kΩ resistor from BIAS to DAC
block to set the idle current.
Shutdown Input. Drive logic low to place the device in shutdown mode. Drive logic high for normal
operation.
Bias Circuit DC Supply Voltage. Bypass to ground using configuration in the typical operating
circuit.
RF Input. Requires external matching.
rd
nd
rd
st
st
Stage Supply Voltage. Bypass to ground using configuration in the typical operating circuit.
Stage and Bias Control Circuit Ground
Stage Ground. Refer to Application Information section for detailed PC-board layout information.
Stage Ground. Refer to Application Information section for detailed PC-board layout information.
Stage Supply Voltage. Bypass to ground using configuration in the typical operating circuit.
the DAC voltage, as shown in the Typical Application
Circuit. Resistor values R1 and R2 are determined as
follows:
where
If no DAC is used and a constant idle current is
desired, use equation 4 to determine the resistor values
for a given total bias current. Only R2 is required.
V
I
I
I
I
V
I
I
V
I
MAX
DAC
MID
CC
MAX
MID
DAC
(I
(I
(V
connected
MAX
MAX
DAC
CC
CC
DAC
FUNCTION
= 1867
= (1.0
= is the idle current with V
= (1.0
= (V
= is the maximum idle current
= is the DAC current
= 0, V
= I
= 1.0 + (1.0
= is the maximum DAC voltage
= is the DAC voltage
= 1.0V or floating)
MAX
DAC
✕
✕
DAC
✕
1867) / R2;
= max value, V
I
1867)
BIAS
- 1.0) / R1
= V
✕
MAX
✕
R1) / R2;
(R1 + R2) / (R1
)
DAC
Pin Description
DAC
= 0)
= 1.0V or not
✕
R2);
(1)
(2)
(3)
(4)
(5)