MAX2232 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 900MHz ISM-Band, 250mW Power Amplifiers with Analog or Digital Gain Control

19-1470; Rev 0; 4/99
900MHz ISM-Band, 250mW Power Amplifiers
with Analog or Digital Gain Control
General Description
The MAX2232/MAX2233 low-voltage, silicon RF power
amplifiers (PAs) are designed for use in the 900MHz
ISM band. They operate from a single +2.7V to +5.5V
supply, allowing them to be powered directly from a 3-
cell NiCd or a 1-cell Lithium-Ion battery. The devices
typically deliver 250mW (+24dBm) of output power at
915MHz from a single +3.6V supply, or 150mW
(+22dBm) from a single +2.7V supply. At +24dBm out-
put power, power-added efficiency (PAE) is 44%.
The MAX2232/MAX2233 provide 24dB of gain, which is
adjustable over a continuous 24dB span via the analog
gain-control pin of the MAX2232 or in two 10dB steps
via the 2-bit programmable gain-control DAC of the
MAX2233. An external capacitor sets the RF output
power envelope ramp time, reducing spurious emis-
sions during power-up and power-down by providing a
gradual change in output power (MAX2232).
The MAX2232/MAX2233 feature a low-power shutdown
mode, which typically draws less than 1µA of supply
current, saving power during “idle slots” in time-division
multiple-access (TDMA) systems. The ∆VSWR of the RF
input in shutdown mode relative to normal operation is
1.2:1. The devices also feature a thermal shutdown
function, enabling the PA to protect itself from excessive
temperature conditions that could damage the IC. A
capacitor to ground limits thermal cycling by setting a
thermal shutdown timeout period.
The MAX2232/MAX2233 are available in a space-sav-
ing, thermally enhanced 16-pin power-QSOP (PQSOP)
package.
Applications
900MHz ISM Band
Digital Cordless Phones
Wireless Data
FM Analog Transmitters
868MHz European ISM Band
Functional Diagram appears at end of data sheet.
Features
o 800MHz to 1000MHz Frequency Range
o 250mW (+24dBm) Output Power at 915MHz from
+3.6V Supply
o +2.7V to +5.5V Single-Supply Operation
o 44% Power-Added Efficiency
o 24dB Power Gain
o 24dB Analog Gain-Control Range (MAX2232)
o Three Levels of Digitally Programmed Power Gain
in 10dB Steps (MAX2233)
o Programmable RF Power Envelope Ramping
(MAX2232)
o Thermal Shutdown
o Programmable Thermal Shutdown Timeout Period
o 0.2µA Low-Power Shutdown Mode
o Low ∆VWSR in Standby and Shutdown Modes
PART
MAX2232EEE
MAX2233EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 PQSOP
16 PQSOP
Pin Configuration
TOP VIEW
RFIN 1
GND 2
SHDN (D1) 3
CTRL (D0) 4
GND 5
GND 6
GND 7
RFOUT 8
MAX2232
MAX2233
16 V_CC
15 GND
14 RAMP+ (N.C.)
13 RAMP- (N.C.)
12 V_CC
11 V_CC
10 TSET
9 N.C.
PQSOP
GROUND OF OUTPUT STAGE CONNECTED TO PACKAGE SLUG.
( ) ARE FOR MAX2233.
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