Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX2233EEE+

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

Features

♦ 800MHz to 1000MHz Frequency Range

♦ 250mW (+24dBm) Output Power at 915MHz from

+3.6V Supply

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

♦ 44% Power-Added Efficiency

♦ 24dB Power Gain

♦ 24dB Analog Gain-Control Range (MAX2232)

♦ Three Levels of Digitally Programmed Power Gain

in 10dB Steps (MAX2233)

♦ Programmable RF Power Envelope Ramping

(MAX2232)

♦ Thermal Shutdown

♦ Programmable Thermal Shutdown Timeout Period

♦ 0.2µA Low-Power Shutdown Mode

♦ Low ∆VWSR in Standby and Shutdown Modes

MAX2232/MAX2233

900MHz ISM-Band, 250mW Power Amplifiers

with Analog or Digital Gain Control

________________________________________________________________ Maxim Integrated Products 1

RFIN V

GND

RAMP+ (N.C.)

RAMP- (N.C.)

TSET

N.C.

TOP VIEW

MAX2232

MAX2233

PQSOP

GND

SHDN (D1)

GND

CTRL (D0)

GND

RFOUT

GROUND OF OUTPUT STAGE CONNECTED TO PACKAGE SLUG.

( ) ARE FOR MAX2233.

19-1470; Rev 1; 6/00

PART

MAX2232EEE

MAX2233EEE

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 PQSOP

Pin Configuration

Ordering Information

Functional Diagrams appear at end of data sheet.

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Summary of content (8 pages)

PAGE 1
9-1470; Rev 1; 6/00 900MHz ISM-Band, 250mW Power Amplifiers with Analog or Digital Gain Control 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 emissions during power-up and power-down by providing a gradual change in output power (MAX2232).
PAGE 2
MAX2232/MAX2233 900MHz ISM-Band, 250mW Power Amplifiers with Analog or Digital Gain Control ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +6.5V SHDN, CTRL, D0, D1 to GND ....................-0.3V to (VCC +0.3V) IRFIN ....................................................................................10mA RFIN Power (50Ω AC-coupled source). .........................+10dBm Output Load VSWR. .............................................................
PAGE 3
900MHz ISM-Band, 250mW Power Amplifiers with Analog or Digital Gain Control (MAX2232/MAX2233 Evaluation Kit, V CC = +3.6V, V CTRL = +2.2V, SHDN = V CC (MAX2232), D0 = D1 = V CC (MAX2233), PRFIN = 0dBm, ƒRFIN = 915MHz, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL Output Power, Low-Power Mode POUT D0 = VCC, D1 = GND (MAX2233 only) 6.5 dBm Gain-Control Range (Note 3) ∆GP 0.6V < VCTRL < 2.2V (MAX2232 only) 23.
PAGE 4
Typical Operating Characteristics (MAX2232/MAX2233 Evaluation Kit, VCC = +3.6V, CTRL = VCC, SHDN = D0 = D1 = VCC, PRFIN = 0dBm, fRFIN = 915MHz, TA = +25°C, unless otherwise noted.) MAX2232 STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE TA = +85°C 1 0.1 TA = +25°C 20 15 10 TA = -40°C 5 0.001 4.0 4.5 5.0 5.5 23 TA = +85°C 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) POWER-ADDED EFFICIENCY vs.
PAGE 5
900MHz ISM-Band, 250mW Power Amplifiers with Analog or Digital Gain Control PIN NAME FUNCTION MAX2232 MAX2233 1 1 RFIN RF Input Port. Requires external matching network and blocking capacitor. 2 2 GND Input Stage Ground. Connect directly to low-inductance ground plane. If vias are used, separate them from other GND pin vias. 3 — SHDN Shutdown Control Input. Drive SHDN low to place the device in shutdown mode. Drive high for normal operation.
PAGE 6
MAX2232/MAX2233 900MHz ISM-Band, 250mW Power Amplifiers with Analog or Digital Gain Control Detailed Description The MAX2232/MAX2233 are nonlinear power amplifiers (PAs) intended for constant envelope applications (FM, FSK, GMSK). The devices operate over the 902MHz to 928MHz frequency range and provide typically 250mW of output power and 44% efficiency from a single +2.7V to +5.5V supply.
PAGE 7
900MHz ISM-Band, 250mW Power Amplifiers with Analog or Digital Gain Control Digital Gain Control and Power Management The MAX2233 responds to logic-level signals at the device’s 2-bit DAC inputs, D0 and D1, placing the device in shutdown mode or into one of three discrete output power levels. See Table 2 for operating modes and output power levels. Setting D0 and D1 to a logiclevel low places the device in shutdown mode and reduces supply current to 0.2µA.
PAGE 8
Typical Application Circuit 68pF 0.22µF 1 RFIN VCC RFIN VCC 16 100pF 15nH 2 3 100pF 4 100pF 5 GND MAX2232 MAX2233 GND SHDN (D1) RAMP+ (N.C.) CTRL (D0) RAMP(N.C.) GND VCC VCC GND 14 CRAMP 0.22µF 13 VCC 12 10nF GND TSET 10nF RFOUT 3.6pF N.C. RFOUT 0.1µF 10 CTSET 0.22µF 0.22µF 8 0.1µF VCC 11 100pF 7 0.1µF 15 100pF 6 10nF 9 2.55nH NOTES: ( ) APPLIES TO MAX2233. BACKSIDE SLUG MUST BE SOLDERED TO GROUNDPLANE. 27nH VCC 100pF 10nF 0.1µF Package Information PSSOPPS.