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PDF MAX2430 Data sheet ( Hoja de datos )
| Número de pieza | MAX2430 | |
| Descripción | Low-Voltage / Silicon RF Power Amplifier/Predriver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX2430 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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19-1093; Rev 2; 1/98
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Low-Voltage, Silicon RF Power
Amplifier/Predriver
________________General Description
The MAX2430 is a versatile, silicon RF power amplifier
that operates directly from a 3V to 5.5V supply, making
it suitable for 3-cell NiCd or 1-cell lithium-ion battery
applications. It is designed for use in the 800MHz to
1000MHz frequency range and, at 915MHz, can pro-
duce +21dBm (125mW) of output power with greater
than 32dB of gain at VCC = 3.6V.
A unique shutdown function provides an off supply cur-
rent of typically less than 1µA to save power during
“idle slots” in time-division multiple-access (TDMA)
transmissions. An external capacitor sets the RF output
power envelope ramp time. External power control is
also possible over a 15dB range. The amplifier’s input
is matched on-chip to 50Ω. The output is an open col-
lector that is easily matched to a 50Ω load with few
external components.
The MAX2430 is ideal as a driver amplifier for portable
and mobile telephone systems, or as a complete power
amplifier for other low-cost applications, such as those
in the 915MHz spread-spectrum ISM band. It is fabri-
cated with Maxim’s high-frequency bipolar transistor
process and is available in a thermally enhanced,
16-pin narrow SO and miniature 16-pin PwrQSOP pack-
ages with heat slug.
________________________Applications
Digital Cordless Phones
915MHz ISM-Band Applications
Two-Way Pagers
Wireless LANs
Cellular Phones
AM and FM Analog Transmitters
Functional Diagram
2
SHDN
6
GND1
4
RFIN
VCC1
7
MASTER
BIAS
GAIN
VCC2
8
BIAS
10
MAX2430
DRIVER
OUTPUT
BIAS
9
RFOUT
3, 5 1, 15, 16
11, 12, 13, 14
GND2
GND3
GND4
NOTE: MAX2430IEE (PwrQSOP PACKAGE) UNDERSIDE METAL
SLUG MUST BE SOLDERED TO PCB GROUND PLANE.
____________________________Features
o Operates Over the 800MHz to 1000MHz Frequency
Range
o Delivers 125mW at 915MHz from +3.6V Supply
(100mW typical from +3.0V supply)
o Operates Directly from 3-Cell NiCd or 1-Cell
Lithium-Ion Battery
o Over 32dB Power Gain
o RF Power Envelope Ramping is Programmable
with One External Capacitor
o Input Matched to 50Ω (VSWR < 2:1)
o 15dB Output Power Control Range
o 1µA Typical Shutdown Current
PART
MAX2430IEE
MAX2430ISE
Ordering Information
TEMP. RANGE
-20°C to +85°C
-20°C to +85°C
PIN-PACKAGE
16 PwrQSOP
16 Narrow SO
Pin Configuration
TOP VIEW
GND3 1
SHDN 2
GND2 3
RFIN 4
GND2 5
GND1 6
VCC1 7
VCC2 8
MAX2430
16 GND3
15 GND3
14 GND4
13 GND4
12 GND4
11 GND4
10 BIAS
9 RFOUT
Narrow SO/PwrQSOP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Low-Voltage, Silicon RF Power
Amplifier/Predriver
_____________________Pin Description
PIN
1, 15,
16
2
NAME
GND3
SHDN
3, 5 GND2
FUNCTION
Driver Stage Ground. Connect directly to
ground plane.
Shutdown Input (TTL/CMOS)
Input Stage Ground. Connect directly to
ground plane.
4
RFIN
RF Input. Internally matched to 50Ω.
Requires series DC-blocking capacitor.
6
GND1
Bias Circuitry Ground. Connect directly to
ground plane.
7
VCC1
Bias Circuitry Supply. Connect to supply.
Bypass with 1000pF capacitor.
Driver Stage Output. Connect to supply
8 VCC2 through inductor (see Applications
Information).
9 RFOUT Output Transistor. Open Collector.
Output Stage Bias Pin. Connect capacitor
10
BIAS
to GND to control start-up power enve-
lope. Drive directly for power control (see
Applications Information).
11–14 GND4
Output Stage Ground. Connect directly to
ground plane.
Note: MAX2430IEE (PwrQSOP package) underside metal slug
must be soldered to PCB ground plane.
Detailed Description
The MAX2430 consists of a large power output transis-
tor driven by a capacitively coupled driver stage (see
Functional Diagram). The driver and front-end gain
stages are DC-connected and biased on-chip from the
master bias cell. The master bias cell also controls the
output stage bias circuit. The input impedance at the
RFIN pin is internally matched to 50Ω, while the output
stage must be tuned and filtered externally for any nar-
row-band frequency range of interest between 800MHz
and 1000MHz.
The driver amplifier requires an external inductor at the
VCC2 pin to provide DC bias and proper matching to
the output stage. This inductor’s value depends on the
package type and frequency range of operation; typi-
cally it will vary between 5nH and 22nH.
The output transistor at the RFOUT pin requires an
external RF choke inductor connected to the supply for
DC bias, and a matching network to transform the
desired external load impedance to the optimal internal
load impedance of approximately 15Ω.
The MAX2430 includes a unique shutdown feature. The
TTL/CMOS-compatible SHDN input allows the device to
be shut down completely without the use of any exter-
nal components. Also, the RF output power envelope
ramp time can be programmed with a single external
capacitor connected between the BIAS pin and
ground. Pulling the shutdown pin (SHDN) high powers
on the master bias circuit, which in turn charges the
external capacitor tied to the BIAS pin using a con-
trolled current. The voltage at BIAS controls the output
power level, which ramps until the BIAS pin is internally
clamped to approximately 2.2V. The envelope ramp-
down time is controlled in a similar manner when the
SHDN pin is pulled low.
Variable output power control over a 15dB range is also
possible by forcing the voltage on the BIAS pin exter-
nally from 0.6V to 2.4V.
During the on state (SHDN = high), the power-supply
bias current is typically 52mA with no RF applied to the
input. During the off state (SHDN = low), the supply
current is typically reduced to less than 1µA.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX2430.PDF ] | |
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