Si4720-A-EVB Silicon Laboratories Inc, Si4720-A-EVB Datasheet - Page 24

• Manufacturer Part Number: Si4720-A-EVB
• Description: WiFi / 802.11 Modules & Development Tools Si4720 Eval Board Use Si4721-A-EVB.
• Manufacturer: Silicon Laboratories Inc

Specifications of Si4720-A-EVB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si4720/21-B20
5. Functional Description
5.1. Overview
The Si4720/21 is the first single-chip FM radio
transceiver.
architecture of the Si4720/21 combines the functionality
of the Si470x FM radio receiver with the Si471x FM
transmitter, offering full FM receive and transmit
capabilities in a single, ultra-small 3x3x0.55 mm QFN
package. The device leverages Silicon Laboratories’
highly successful and proven FM technology and offers
unmatched integration and performance. FM receiver
and transmit functionality may be added to any portable
device by using this single chip. As with the Si470x and
Si471x products, the Si4720/21 offers industry leading
size, performance, low power consumption, and ease of
use.
The Si4720/21 is the first FM radio transceiver
integrated circuit to support a small loop antenna, which
can be integrated into the enclosure or PCB of a
portable device. This feature enables applications that
also include Bluetooth functionality to perform FM radio
reception without cables. For portable navigation
devices, the Si4720’s antenna architecture permits
integration of the traffic messaging antenna into the
enclosure of the portable device, and eliminates the
need for external antenna cables.
The Si4720's digital integration reduces the required
external components of traditional offerings, resulting in
a solution requiring only an external inductor and
24
Tx/Rx Ant
Rx Ant*
The
*Note: Dedicated Rx antenna is optional
2.7–5.5 V
proven
120 nH
L1
22 uF
RFGND
C1
GND
TXO
VDD
FMI
and
LNA
Figure 14. Functional Block Diagram
AGC
LDO
patented
digital
PGA
AFC
Rev. 1.0
bypass capacitor, and a PCB space of approximately
15 mm
Silicon Laboratories' Si470x FM radio receivers, Si473x
AM/FM radio receivers, and the Si471x FM radio
transmitter solutions, allowing a single PCB layout to
accommodate a variety of music features. High yield
manufacturability,
design-in, and software programmability are key
advantages of the Si4720.
The Si4720/21’s integrated receive power scan function
shares the same antenna as the transmitter allowing for
a compact printed circuit board design. The device
operates in half duplex mode, meaning the transmitter
and receiver do not operate at the same time.
The Si4720/21 performs FM modulation in the digital
domain to achieve high fidelity, optimal performance
versus power consumption, and flexibility of design. The
onboard DSP provides modulation adjustment and
audio dynamic range control for optimum sound quality.
The Si4721 supports the European Radio Data System
(RDS) and the US Radio Broadcast Data System
(RBDS) including all the symbol encoding, block
synchronization, and error correction functions. Using
this feature, the Si4721 enables data such as artist
name and song title to be transmitted to an RDS/RBDS
receiver.
2
. The Si4720/21 is layout compatible with
ADC
ADC
GPO
DSP
unmatched
DAC
DAC
INTERFACE
CONTROL
Si4720
performance,
LIN
RIN
ROUT
LOUT
easy