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Conexant Systems
Conexant Systems

CX77301 Datasheet Preview

CX77301 Datasheet

PA Module for Dual-Band EGSM900

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CX77301 pdf
Preliminary Information
This document contains information on a new product. The parametric information, although not
mfully characterized, is the result of testing initial devices.
CPAXM7tao7dSuh3lee0efot14rUD.ucoal-band EGSM900 / DCS1800 / GPRSThe CX77301 is a dual-band Power Amplifier Module (PAM) designed in a
compact form factor for Class 4 EGSM900 and Class 1 DCS1800 operation that
aalso supports multi-slot transmission for Class 10 General Packet Radio Service
.D(GPRS) operation.
wThe module consists of an EGSM900 PA block, a DCS1800 PA block, impedance
w matching circuitry for 50 input and output impedances, and bias control
w circuitry. Two separate Heterojunction Bipolar Transistor (HBT) PA blocks are
mfabricated on a single Gallium Arsenide (GaAs) die. One PA block operates in the
EGSM900 band and the other PA block supports the DCS1800 band. Optimized
ofor lithium ion battery operation, both PA blocks share common power supply
.cpins to distribute current. A custom CMOS integrated circuit provides the
internal interface circuitry, including a current amplifier that minimizes the
required power control current (IAPC) to 10 µA, typical. The GaAs die, the
USilicon (Si) die, and passive components are mounted on a multi-layer laminate
substrate. The assembly is encapsulated with plastic overmold.
t4The RF input and output ports are internally matched to 50 to reduce the
number of external components for a dual-band design. Extremely low leakage
ecurrent (2 µA, typical) of the dual PA module maximizes handset standby time.
eThe CX77301 also contains band-select switching circuitry to select EGSM
(logic 0) or DCS (logic 1) as determined from the Band Select (BS) signal. In the
hFunctional Block Diagram shown below, the BS pin selects the PA output
(DCS OUT or EGSM OUT) while the Analog Power Control (APC) controls the
Slevel of output power.
Distinguishing Features
• High efficiency:
EGSM 55%
DCS 50%
• Input/output matching
50 internal
• Small outline
9.1 mm x 11.6 mm
• Low profile
1.5 mm maximum
• Low APC current
10 µA typical
• Gold plated, lead-free contacts.
Applications
• Dual-band cellular handsets
encompassing
Class 4 EGSM900,
Class 1 DCS1800, and
up to Class 10 GPRS multi-slot
operation.
taFunctional Block Diagram
www.Da omDCSIN
U.cPower Control
t4Band Select
heeEGSM IN
Match
CMOS
Bias
Controller
Match
www.DataSData Sheet
VCC
HBT
Match
Match
DCS OUT
EGSM OUT
100956D
© 2001, Conexant Systems, Inc., All Rights Reserved.
January 2, 2002



Conexant Systems
Conexant Systems

CX77301 Datasheet Preview

CX77301 Datasheet

PA Module for Dual-Band EGSM900

No Preview Available !

CX77301 pdf
Electrical Specifications
CX77301
PA Module for Dual-band EGSM900 / DCS1800 / GPRS
Electrical Specifications
The following tables list the electrical characteristics of the CX77301 Power Amplifier. Table 1
lists the absolute maximum ratings and Table 2 shows the recommended operating conditions.
Table 3 shows the electrical characteristics of the CX77301 for EGSM and DSC modes. A typical
CX77301 application diagram appears in Figure 1.
The CX77301 is a static-sensitive electronic device and should not be stored or operated near
strong electrostatic fields. Detailed ESD precautions along with information on device dimensions,
pin descriptions, packaging and handling can be found in later sections of this data sheet.
Table 1. Absolute Maximum Ratings
Parameter
Minimum
Maximum
Unit
Input power (PIN)
15 dBm
Supply voltage (VCC), standby, VAPC 0.3 V
7V
Control voltage (VAPC)
0.5
VCC_MAX 0.2
V
(See Table 3)
Storage Temperature
55
+100
°C
Table 2. CX77301 Recommended Operating Conditions
Parameter
Supply Voltage (VCC)
Supply Current (ICC)
Operating Case Temperature (TCASE)
1-Slot (12.5% duty cycle)
2-Slot (25% duty cycle)
3-Slot (37.5% duty cycle)
4-Slot ( 50% duty cycle)
Minimum
2.9
0
20
20
20
20
Typical
3.5
Maximum
4.8 V(1)
2.5(1)
100
90
75
60
NOTE(S):
(1) For charging conditions with VCC > 4.8 V, derate Icc linearly down to 0.5 A max at VCC = 5.5 V
Unit
V
A
°C
1
Conexant
100956D
Jannuary 2, 2002


Part Number CX77301
Description PA Module for Dual-Band EGSM900
Manufacturer Conexant Systems
Total Page 18 Pages
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