CMM0530-LC
Advanced Product Information
May 1999
(1 of 4)
824 to 928 MHz
3.0V, 30.5 dBm Multi-Mode
Plastic LCC-8 Power Amplifier
Functional Block Diagram
Ground Tab
Vg2
1
Vg1
2
RF IN
3
N/C
4
8
N/C
7
RF OUT/Vd2
6
RF OUT/Vd2
5
Vd1
Ground Tab
Features
t
Multi-Mode Operation as Low as 3.0V
t
42% Linear Power Added Efficiency
t
55% Analog Power Added Efficiency
t
New Low-Cost, Plastic LCC-8 Package
t
29 dB Gain
t
Tested Under Digital Modulation
t
PHEMT Material Technology
Applications
t
IS-98/AMPS Handsets
t
IS-136/AMPS Cellular Handsets
t
900 MHz ISM Band Products
t
Wireless Local Loop Subscriber Terminals
Description
The CMM0530-LC is a highly efficient multi-mode
power amplifier GaAs MMIC intended for use in portable tele-
phone handsets and data communications products for wireless
communications. It meets the handset requirements for cellular
AMPS, and the CDMA and TDMA digital standards for the US
cellular wireless communications. CMM0530-LC is a member
of the new
Triniti DX Pro
™
amplifier family whose members
are pin-compatible and all operate under 3.5V bias voltage. The
CMM0530-LC is packaged in a low-cost, plastic, LCC-8 power
package. It has low thermal impedance and low RF loss. The
device requires minimum amount of external biasing and RF
matching circuits.
Absolute Maximum Ratings
Parameter
Rating
Parameter
Rating
Parameter
Rating
Drain Voltage (+Vd)
Drain Current (Id)
RF Input Power
DC Gate Voltage (-Vg)
+5.5 V*
1.8 A
+10 dBm*
-3.0 V*
Power Dissipation
Thermal Resistance
Storage Temperature
5W
20°C/W
-65°C to +150°C
Operating Temperature
Channel Temperature
Soldering Temperature
-40°C to +90°C
150°C
260°C for 5 Sec.
* Max (+Vd) and (-Vg) under linear operation. Max potential difference across the device at 1 dB gain compression point (2Vd + |-Vg|) not to exceed the minimum breakdown voltage (Vbr) of +12V.
Recommended Operating Conditions
Parameter
Typ
Units
Parameter
Typ
Units
Drain Voltage (+Vd)
3.0 to 4.2
Volts
Operating Temperature (PC Board)
-30 to +80
°C
Application Information
The CMM0530-LC is a two-stage amplifier that requires
both positive and negative power supplies for proper operation.
It is essential that the negative supply be applied first during
turn-on and last during turn-off. Otherwise, the device may be
damaged.
The CMM0530-LC can be operated over a wide range of
positive and negative voltages to obtain various power, linearity
and efficiency performance. However, it is important to keep
the maximum DC power and the bias voltages within the speci-
fied absolute maximum rating to prevent over stressing the
device either electrically or thermally.
Design Considerations
Biasing
Negative gate voltages are necessary to set the bias
currents of the two FET stages in the CMM0530-LC. The first
stage gate bias voltage is applied to Vg1 (Pin 2). The second
stage gate bias voltage is applied to Vg2 (Pin 1). It is desirable
to use one or more DACs (digital to analog converters) along
3236 Scott Boulevard
Santa Clara, California 95054
with appropriate resistor divider networks, when necessary, in
order to adjust the quiescent currents to within 10 mA of the
targeted values. As an example, for CDMA applications the tar-
get quiescent current of the second FET is 120 mA, while that
of the first is 50 mA. The total quiescent is 170 mA. It is also
recommend that the quiescent currents be set in the following
sequence: the second stage FET is set first, followed by the first
stage FET. The negative supply voltages control the quiescent
currents through each FET and, therefore, control the output
power, adjacent channel power ratio, and the currents at full
output power.
The positive supply voltages are applied to Pins 5, 6 and 7.
It is very important to provide adequate de-coupling
between the RF and the DC signals in designing the DC bias
circuit. Inadequate by-pass capacitance around the DC supply
lines and inductance can compromise the adjacent channel
power ratio (ACPR), or reduce power gain and/or create oscil-
lations. The recommend DC by-pass capacitance and low-pass
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