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PDF ACPM-7833 Data sheet ( Hoja de datos )
| Número de pieza | ACPM-7833 | |
| Descripción | Power Amplifier Module | |
| Fabricantes | AVAGO | |
| Logotipo |  |
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ACPM-7833
CDMA1900 (PCS) Power Amplifier Module
Data Sheet
Description
The ACPM-7833 is a fully matched CDMA Power
amplifier module. Designed around Avago
Technologies’ new Enhancement Mode pHEMT
process, the ACPM-7833 offers premium performance
in a very small form factor. Fully matched to 50 Ohms
on the input and output.
The amplifier has excellent ACPR and efficiency
performance at max Pout and low quiescent current
with a single bias control voltage. For even lower
quiescent current, a dynamic bias control circuit can
be used by varying the voltage on the Vcntl pin
between 1.2V to 2.5V.
Designed in a surface mount RF package, the ACPM-
7833 is cost and size competitive.
The ACPM-7833 is another key component of the
Avago Technologies CDMAdvantage RF chipset.
Features
• Operating frequency: 1850– 1910 MHz
• 28.5 dBm linear output power @ 3.4V
• High efficiency: 40% PAE
• Dynamic bias control for low midpower Idd
• Very low quiescent current with single control
voltage
• Internal 50 ohm matching networks for both RF IN/
OUT
• 3.2– 4.2V linear operation
• cdma2000 1xRTT capable
• Only 3 SMT parts needed
• 4.0 x 4.0 x 1.1 mm SMT package
Applications
• CDMA handsets
• Datacards
• PDAs
Input
Power
Input
Match
Vdd1
Vbias
Bias Circuit
On Chip
Inter-stage
Match
Vdd2
Passive
Output
Match
Output
Vcntl
Single control bias setting for low Idq
and 40% PAE at Pout = 28.5 dBm
1 page  
Ordering Information
Part Number
ACPM-7833-BLK
ACPM-7833-TR1
No. of Devices
10
1000
Tape Dimensions and Orientation
0.30 ± 0.05
2.00 ± 0.05[1]
φ1.55 ± 0.05
CL 4.38 ± 0.10
4.38 ± 0.10
1.80 ± 0.10
8.00 ± 0.10
Notes:
1. Measured from centerline of sprocket hole to centerline of pocket
2. Cumulative tolerance of 10 sprocket holes is ±0.2 mm
3. All dimensions in millimeters unless otherwise stated.
Container
Bulk
7” Tape and Reel
4.00 ± 0.10[2]
1.75 ± 0.10
5.50 ± 0.05[3]
12.00 ± 0.30
4.38 ± 0.10
φ1.50 (MIN)
Agilent
ACPM-7833
YYWWDD
XXXX
5
5 Page 
Design Tips to use Vcntl pin
Power Amplifier Control Using Vcntl Pin on ACPM-7833
Power amplifier control scheme in CDMA systems is
one of the important and challenging aspects of CDMA-
based handset design. Handset designers must balance
maintaining adequate linearity while optimizing
efficiency at high, medium and low output power
levels. The primary method to achieve these goals is
to adjust the bias of the PA as a function of output
power. Theoretically, the best efficiency would be
achieved when the bias of the PA is continually
adjusted based on the output power requirement of
the PA. However, implementing this type of circuit can
be complex and costly. Therefore several different
approaches have been developed to provide an
acceptable trade-off between optimum efficiency and
optimum manufacturability. This application section
reviews four methods of controlling the bias of a CDMA
power amplifier: fixed, step, logical and dynamic.
1. Fixed Bias Control
Using a fixed bias point on the PA is the traditional
method, and it is the simplest. For example, the
recommended value of the fixed control voltage on
the Vcntl pin for the ACPM-7833 is 2.5V. The Vcntl pin
on the PA is controlled by PA_ON pin of the baseband
IC. When PA_ON is HIGH, the output RF signal of the
PA is enabled, enabling the subscriber unit to transmit
the required data. The switch circuit also controls the
on/off state of the PA.
Below is an example of how to control the the output
of the PA using PA_ON and Vcntl pins.
Power Mode
Shut Down
High Power
PA_ON
LOW
HIGH
Vcntl
0V
2.5V
Power Range
—
- 28.5 dBm
To Duplexer
Vbias
Vdd2
Vdd1 PA
Vcntl
Battery
TxIC
Baseband
IC
Enable
Switch Circuit for PA
Vcntl
PMIC or LDO
PA_ON
Note: PMIC: Power Management IC
LDO: Low Drop Output (Regulator)
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ACPM-7833.PDF ] | |
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