SI4205-BM Silicon Laboratories Inc, SI4205-BM Datasheet - Page 14

• 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
Typical Application Schematic
Notes:
14
DIAG1
DIAG2
XEN
XIN
SDI
SCLK
SENB
PDNB
XOUT
SDO
TXIP
TXIN
TXQP
TXQN
RXQP
RXQN
RXIP
RXIN
1. Connect pads on bottom of U1 to GND.
2. See “AN92: Aero™ I/Aero™ I+ Transceiver PCB Layout Guidelines” for details on the following:
3. For the XIN input, no external ac coupling is required.
4. For optimum performance, connect pin 31 to ground plane of power amplifier through several vias close to pin.
LNA matching network (C1–C6, L1–L3). Values should be custom tuned for a specific PCB layout and SAW filter to
optimize performance.
Differential traces between the SAW filters (Z1–Z3) and transceiver (U1) pins 16–21.
Detailed SAW filter requirements.
R1
C8
VDD
C7
VDD
32
29
1
2
3
4
5
6
7
VDD
RXQN
RXIP
RXIN
TXIP
TXIN
TXQP
TXQN
GND
U1
Si4205
RFIGN
RFIGP
RFIDN
RFIDP
RFIPN
RFIPP
GND
GND
GND
31
21
20
19
18
17
16
15
30
Rev. 1.0
L1
L2
L3
C1
C2
C3
C4
C5
C6
OUT+
OUT-
OUT+
OUT-
OUT+
OUT-
Z1
Z2
Z3
GND
GND
GND
IN
IN
IN
RFOG
RFOD
GSM900 IN
DCS 1800 IN
PCS 1900 IN