Datasheet

MAX2232/MAX2233
900MHz ISM-Band, 250mW Power Amplifiers
with Analog or Digital Gain Control
_______________________________________________________________________________________ 5
Pin Description
PIN
FUNCTION
MAX2232 MAX2233
13 —
Negative Terminal of Output Power Ramp Capacitor. Connect capacitor, C
RAMP
, between
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 —
Positive Terminal of Output Power Ramp Capacitor. Connect capacitor, C
RAMP
, between
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-
V
CC
V
CC
TSET
N.C.
RAMP+
GND
V
CC
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