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LMV248LQ-LMV248LQX
Dual Band GSM Power Controller
LMV248
Dual Band GSM Power Controller
General DescriptionThe LMV248 RF power amplifier controller allows simple
implementationof transmit power control loopsin GSM and
DCS/PCS and mobile phones. The LMV248 supports, GaAs
HBT and bipolarRF power amplifiers. The device operates
froma single supplyof 2.5Vto5V. The LMV248 includesan
error amplifier withan input summing network, input and
output band switches, input filters, and output drivers. Ana-
log input signals processed are: Coupler/detector voltages from GSM and PCN band
power amplifier outputs. Base band DAC ramp signal. Temperature compensation diode voltages. Pre-bias voltagefor fasterPA control.
Selectionofthe GSMor PCN output driveris made usingthe
GSM/PCN band select pin.
The On/OFFpin allows rapid powerupor shutdownof the
device duringTxorRx slots.In theoff mode, both output
drivers are set lowfor PA shutdown.In theon mode, the
non-active driverwill remain lowfor continuedPA shutdown. single external capacitor/resistor combinationis usedto
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 Multi-band cellular operation (example: GSM, PCN) Supportof GaAs HBT and bipolar technology Shutdown modefor power saveinRx slot (0.15μA) Integrated ramp filter Built-in current sourcefor biasing Schottky diodes Pre-biasingofPA control gate voltage (VHOME) GPRS compliant External loop compensation Detector diode temperature compensation Miniature packaging: LLP-16: 4mmx 4mmx 0.8mm
Applications GSM mobile phone TDMARF control Wireless LAN PC and PDA modules GPS navigation modules
Connection Diagram
16-Pin LLPTop View
Typical Application Circuit
FIGURE1.
September 2001
LMV248
Dual
Band
GSM
Power
Controller
