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LMV248LQX Datasheet

  • LMV248LQX

  • Dual Band GSM Power Controller

  • 291.81KB

  • 11頁

  • NSC

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LMV248 Dual Band GSM Power Controller
September 2001
LMV248
Dual Band GSM Power Controller
General Description
The LMV248 RF power amplifier controller allows simple
implementation of transmit power control loops in GSM and
DCS/PCS and mobile phones. The LMV248 supports, GaAs
HBT and bipolar RF power amplifiers. The device operates
from a single supply of 2.5V to 5V. The LMV248 includes an
error amplifier with an input summing network, input and
output band switches, input filters, and output drivers. Ana-
log input signals processed are:
鈥?Coupler/detector voltages from GSM and PCN band
power amplifier outputs.
鈥?Base band DAC ramp signal.
鈥?Temperature compensation diode voltages.
鈥?Pre-bias voltage for faster PA control.
Selection of the GSM or PCN output driver is made using the
GSM/PCN band select pin.
The On/OFF pin allows rapid power up or shutdown of the
device during Tx or Rx slots. In the off mode, both output
drivers are set low for PA shutdown. In the on mode, the
non-active driver will remain low for continued PA shutdown.
A single external capacitor/resistor combination is used to
adjust the closed loop frequency response.
The LMV248 replaces multiple discrete parts, reducing
board area and cost. The LLP leadless package minimizes
board footprint and permits flexible optimized PCB place-
ment.
Features
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Multi-band cellular operation (example: GSM, PCN)
Support of GaAs HBT and bipolar technology
Shutdown mode for power save in Rx slot (0.15碌A(chǔ))
Integrated ramp filter
Built-in current source for biasing Schottky diodes
Pre-biasing of PA control gate voltage (V
HOME
)
GPRS compliant
External loop compensation
Detector diode temperature compensation
Miniature packaging: LLP-16: 4mm x 4mm x 0.8mm
Applications
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GSM mobile phone
TDMA RF control
Wireless LAN
PC and PDA modules
GPS navigation modules
Connection Diagram
16-Pin LLP
Typical Application Circuit
10137201
Top View
10137202
FIGURE 1.
漏 2001 National Semiconductor Corporation
DS101372
www.national.com

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