SI4205-BM Silicon Laboratories Inc, SI4205-BM Datasheet - Page 16

• Manufacturer Part Number: SI4205-BM
• Description: IC TXRX TRI-BAND 32LGA
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4205-BM

• Frequency: 850MHz, 900MHz, 1.8GHz, 1.9GHz
• Modulation Or Protocol: GSM
• Applications: Cellular, GSM Cellular Radio
• Voltage - Supply: 2.7 V ~ 3.3 V
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Package / Case: 32-LGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Operating Temperature: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -
• Current - Transmitting: -
• Current - Receiving: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Aero I
Functional Description
The Aero I transceiver is the industry’s most integrated
RF front end for multi-band GSM/GPRS digital cellular
handsets and wireless data modems. The highly
integrated solution eliminates the IF SAW filter, external
low noise amplifiers (LNAs) for three bands, transmit
and RF voltage controlled oscillator (VCO) modules,
and more than 70 other discrete components found in
conventional designs.
The high level of integration obtained through high-
performance packaging and fine line CMOS process
technology results in a solution with 50% less area and
80% fewer components than competing solutions. A
triple-band
transceiver can be implemented with 15 components in
less than 1.2 cm
is an enabling force in lowering the cost, simplifying the
design and manufacturing, and shrinking the form factor
in
terminals.
The receive section uses a digital low-IF architecture
that avoids the difficulties associated with direct
conversion while delivering lower solution cost and
reduced
16
next-generation
complexity.
GSM
2
GSM
DCS
GSM
DCS
PCS
PCS
of board area. This level of integration
transceiver
GSM/GPRS
The
PA
PA
baseband
Figure 8. Aero I Transceiver Block Diagram
LNA
LNA
LNA
using
voice
0 / 90
interface
the
and
PLL
RF
Aero I
data
Rev. 1.0
is
PGA
PGA
DET
compatible with any supplier’s baseband subsystem.
The transmit section is a complete up-conversion path
from the baseband subsystem to the power amplifier,
and uses an offset phase-locked loop (PLL) with a fully
integrated transmit VCO. The frequency synthesizer
uses Silicon Laboratories’ proven technology, which
includes integrated RF and IF VCOs, varactors, and
loop filters.
The unique integer-N PLL architecture produces a
transient response that is superior in speed to
fractional-N architectures without suffering the high
phase noise or spurious modulation effects often
associated with those designs. This fast transient
response makes the Aero I transceiver well suited to
GPRS multi-slot applications where channel switching
and settling times are critical.
While conventional solutions use BiCMOS or other
bipolar process technologies, the Aero I transceiver
employs 100% CMOS process. This brings the dramatic
cost savings and extensive manufacturing capacity of
CMOS to the GSM market.
PLL
ADC
ADC
IF
100 kHz
XIN
PGA
PGA
13 or 26 MHz
VC-TCXO
Si4205
DAC
DAC
XOUT
AFC
Q
Q
I
I