Single Chip GSM Radio
Fully Integrated GSM Transceiver including
Direct Conversion Receiver
4 Differential LNAs
Integrated Active RX Channel Select Filters
Programmable Gain Baseband Amplifiers
Translation Loop Direct VCO Modulator
Integrated TX VCO and tank
External TX filters eliminated
Integrated Loop filter components
High performance multi band PLL system
Fast Fractional-N Synthesizer
Integrated Local Oscillator VCO
Fully Integrated Loop filters
Crystal Reference Oscillator & Tuning System (AD6548)
Integrated LDOs allow direct battery supply connection
32-Lead 5 X 5 mm Chipscale Package
Dual, Triple and Quad Band Radios
- GSM850, E-GSM 900, DCS1800 and PCS1900
- GPRS to Class 12- EDGE RX
The AD6548/9 provides a highly integrated direct conversion
radio solution that combines, on a single chip, all radio and
power management functions necessary to build the most com-
pact GSM radio solution possible. The only external components
required for a complete radio design are the Rx SAWs, PA,
Switchplexer and a few passives enabling an extremely small
cost effective GSM Radio solution.
The AD6548/9 uses the industry proven direct conversion re-
ceiver architecture of the OthelloTM family. For Quad band appli-
cations the front end features four fully integrated programmable
gain differential LNAs. The RF is then downconverted by quad-
rature mixers and then fed to the baseband programmable-gain
amplifiers and active filters for channel selection. The Receiver
output pins can be directly connected to the baseband analog
processor. The Receive path features automatic calibration and
tracking to remove DC offsets.
The transmitter features a translation-loop architecture for di-
rectly modulating baseband signals onto the integrated TX VCO.
The translation-loop modulator and TX VCO are extremely low
noise removing the need for external SAW filters prior to the PA.
The AD6548/9 uses a single integrated LO VCO for both the
receive and the transmit circuits. The synthesizer lock times are
optimized for GPRS applications up to and including class 12.
To dramatically reduce the BOM both TX Translational loop and
main PLL Loop Filters are fully integrated into the device.
AD6548 incorporates a complete reference crystal calibration
system. This allows the external VCTCXO to be replaced with a
low cost crystal. No other external components are required. The
AD6549 uses the traditional VCTCXO reference source.
The AD6548/9 also contains on-chip low dropout voltage regula-
tors (LDOs) to deliver regulated supply voltages to the functions
on chip, with a battery input voltage of between 2.9V and 5.5V.
Comprehensive power down options are included to minimize
power consumption in normal use.
A standard 3 wire serial interface is used to program the IC. The
interface features low-voltage digital interface buffers compatible
with logic levels from 1.6V to 3.0V.
The AD6548/9 is packaged in a 5mm× 5mm , 32-lead LFCSP
AD6548BCPZ -20°C to +85°C
AD6549BCPZ -20°C to +85°C
Rev B (1st October 2007)
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