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PDF ML2751DT Data sheet ( Hoja de datos )
| Número de pieza | ML2751DT | |
| Descripción | Power Amplifier and LNA | |
| Fabricantes | Micro Linear | |
| Logotipo |  |
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PRELIMINARY
ML2751 Power Amplifier and LNA
GENERAL DESCRIPTION
The 2751 is a 900 MHz ISM band radio front-end intended
for use in half duplex radio applications such as cordless
phones and FCC Part 15 compliant devices. It integrates a
power amplifier (PA), a Low Noise Amplifier (LNA), Pin
Diode drivers for an external transmit/receive switch, and
control circuits. The 100mW power amplifier has output
power control with a >20dB range. The ML2751 can be
used to increase battery life and offers output power ramp
control in TDMA applications. An internal LNA eliminates
the need for a discrete design. PIN diode drivers control
the transmit/receive switch directly. Internal logic
individually enables the LNA, PA, and PIN diode drivers.
A power down mode to minimize current consumption is
included.
SIMPLIFIED BLOCK DIAGRAM
FEATURES
n Fully integrated Power Amplifier, Low Noise Amplifier,
and PIN diode drivers
n 100mW Power Amplifier
n Single supply, 2.7V to 4.5V operating range
n PA output: +21 dBm at 3.0V, 35dB gain, 35%
efficiency at 3.3V after harmonic filter; integrated PA
ramp control
n LNA: noise figure of 2.5dB, –15dBm 3rd-order intercept
point, and –25dBm
APPLICATIONS
n 900 MHz FCC Part 15 Radios
n 900 MHz Cordless Telephones
n TDD / TDMA Radios
ML2751
TRFO
PA
RAMP
GEN.
POWER
CONTROL
AMP
TPS, PAON, FEEN
TRFI
Watch
Osc.
Xtal
PIN
RF PIN
DIODE
SWITCH
PINB
PIN DIODE
DRIVERS
RLNI
CONT.
BLOCK
LNA
LOOP
FILTER
ML2721
Baseband IC
(MODEM
CODEC
Protocol
MMI Control)
RRFO
Memory
Keypad
Display
Mic.
Speaker
Ringer
BATTERY
DATASHEET
January, 2000
1 page  
PRELIMINARY
ML2751
PIN DESCRIPTIONS (continued)
Pin #
Signal Name
I/O Description
PIN Diode Driver Section
12 PIN
13 PINB
O (analog)
O (analog)
This output is a low impedance voltage source that switches between
VCC and GND to drive an external PIN diode switch. This totem pole
output is tri-stated when FEEN = 0. When active it pulls either to VCC
(if PAON = 1) or to GND (if PAON = 0), and has a nominal output
impedance of 50W when sourcing and 120W when sinking
This output is a low impedance voltage source that switches between
VCC and GND to drive an external PIN diode switch. This totem pole
output is tri-stated when FEEN = 0. When active it pulls either to VCC
(if PAON = 0) or to GND (if PAON = 1) , and has a nominal output
impedance of 50W when sourcing and 120W when sinking. PINB is the
complement of PIN, providing a bipolar drive for PIN diodes from a
single power rail
Control and Interface
1 PAON
2 FEEN
I (CMOS)
I (CMOS)
Power Amplifier on pin. The PA is active when PAON = 1, and the LNA
is active when PAON = 0. Rising and falling edges of this signal
initiate a controlled ramp of the PA bias circuits to eliminate AM
generated sidebands on the transmitter output. The PIN diode drivers
are synchronized with PAON (see Figure 3). When the ML2751 is in
standby mode this pin has no effect
Front-end enable. FEEN is the master power down pin. When FEEN = 0
the ML2751 is in standby mode. When FEEN = 1 either the PA or the
LNA is enabled (determined by the state of PAON). See Figure 3
Power & Ground
15 VCC
4 GND
6 GND
7 GND
8 GND
14 GND
16 GND
17 GND
19 GND
20 GND
Power
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Positive power supply for the LNA, the first stages of the PA, the PIN
diode drivers, and the control logic. Care should be exercised in PCB
layout to minimize the trace length, and the inductance and resistance
both in the connection to the capacitor and from the capacitor to
ground
January, 2000 PRELIMINARY DATASHEET
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ML2751DT.PDF ] | |
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