900MHz ISM-Band, 250mW Power Amplifiers

with Analog or Digital Gain Control

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5

Pin Description

PIN

FUNCTION

MAX2232

MAX2233

13

—

RAMP+ and RAMP- to control the rise and fall time of the output power ramp.

12

12

Input Stage Supply Voltage. Bypass with appropriate capacitors to GND.

11

11

Second Stage Supply Voltage. Bypass with appropriate capacitors to GND.

10

10

Thermal Shutdown Timeout Capacitor Terminal. Connect a capacitor from TSET to ground

to limit thermal cycling.

9

9, 13, 14

No Connection. Do not make a connection to this pin.

14

—

RAMP+ and RAMP- to control the rise and fall time of the output power ramp.

15

15

Bias Circuitry Ground. Connect directly to low-inductance ground plane. If vias are used,

separate them from other GND pin vias.

16

16

Bias Circuitry Supply Voltage. Bypass with appropriate capacitors to GND.

SLUG

SLUG

Output Stage Ground. Provides additional thermal conduction, as well as a low-inductance

path to ground. Connect directly to low-inductance ground plane.

NAME

RAMP-

TSET

N.C.

RAMP+

GND

GND

8

8

Open-Collector, RF Output Port. Connect output matching network to this pin.

RFOUT

5, 6

5, 6

Second Stage Ground. Connect directly to low-inductance ground plane. If vias are used,

separate them from other GND pin vias.

GND

7

7

Output Stage Ground. Connect directly to low-inductance ground plane. If vias are used,

separate them from other GND pin vias.

GND

4

—

Analog Gain-Control Input. Apply a voltage between 0.6V and 2.2V to vary the gain of the

PA. Drive CTRL below 0.4V to place the device in standby mode. Drive CTRL above 2.2V to

place the device in peak output power mode.

CTRL

3

—

Shutdown Control Input. Drive SHDN low to place the device in shutdown mode. Drive high

for normal operation.

SHDN

—

3

Digital Gain/Shutdown Control Input. MSB of the 2-bit digital output power control. D0 and

D1 set the output power to one of three discrete levels. To place the device in shutdown,

drive D0 and D1 low (Table 2).

D1

—

4

Digital Gain/Shutdown Control Input. LSB of the 2-bit digital output power control. D0 and

D1 set the output power to one of three discrete levels. To place the device in shutdown,

drive D0 and D1 low (Table 2).

D0

1

1

RF Input Port. Requires external matching network and blocking capacitor.

RFIN

2

2

Input Stage Ground. Connect directly to low-inductance ground plane. If vias are used,

separate them from other GND pin vias.

GND