S i 4 3 11
315/433.92 MH
Z
FSK R
ECEIVER
Features
Single chip receiver with only six
external components
Selectable 315/433.92 MHz carrier
frequency
Supports FSK modulation
High sensitivity (–104 dBm @ 5 kbps)
Excellent interference rejection
Selectable IF bandwidths
Automatic Frequency Centering (AFC)
Data rates up to 10 kbps
Direct battery operation with on-
chip low drop out (LDO) voltage
regulator
16 MHz crystal oscillator support
3x3x0.85 mm 20L QFN package
(RoHS compliant)
–40 to +85 °C temperature range
Applications
Ordering Information:
See page 14.
Satellite set-top box receivers
Remote controls, IR
replacement/extension
Garage and gate door openers
Home automation and security
Remote keyless entry
After market alarms
Telemetry
Wireless point of sale
Toys
Pin Assignments
Si4311
(Top View)
DEV0
17
10
XTL2
DEV1
16
15 BT0
14 BT1
13 DOUT
12 GND
7
GND
8
VDD
9
XTL1
11 VDD
NC
NC
19
NC
18
Description
The Si4311 is a fully-integrated FSK CMOS RF receiver that operates in the
unlicensed 315 and 433.92 MHz ultra high frequency (UHF) bands. It is designed
for high-volume, cost-sensitive RF receiver applications, such as set-top box RF
receivers, remote controls, garage door openers, home automation, security,
remote keyless entry systems, wireless POS, and telemetry. The Si4311 offers
industry-leading RF performance, high integration, flexibility, low BOM, small
board area, and ease of design. No production alignment is necessary as all RF
functions are integrated into the device.
VDD
1
RFGND 2
RX_IN 3
RST 4
AFC 5
6
315/434
20
GND
PAD
Functional Block Diagram
Antenna
RX_IN
LNA
AGC
2.7 – 3.6 V
VDD
GND
LDO
AFC
XTAL
OSC
PGA
ADC
ADC
Si4311
DOUT
DSP
MCU
BASEBAND
PROCESSOR
SQUELCH
Patents pending
AFC
315/434
DEV[1:0]
BT[1:0]
RST
16 MHz
Rev. 0.5 3/10
Copyright © 2010 by Silicon Laboratories
Si4311
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
SILABS [ SILICON LABORATORIES ]
