RFRXD0420T-I/LQ Microchip Technology, RFRXD0420T-I/LQ Datasheet - Page 2

• Manufacturer Part Number: RFRXD0420T-I/LQ
• Description: IC RCVR 315/433MHZ ASK/FSK32LQFP
• Manufacturer: Microchip Technology

Specifications of RFRXD0420T-I/LQ

• Frequency: 300MHz ~ 450MHz
• Sensitivity: -106dBm
• Data Rate - Maximum: 80 kbps
• Modulation Or Protocol: ASK, FM, FSK
• Applications: Home Automation, Remote Sensing, RKE
• Current - Receiving: 9.2mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• For Use With: DV164102 - KIT DEV RFPICKIT KIT 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -

rfRXD0420/0920
1.0
The rfRXD0420/0920 are low cost, compact single
frequency short-range radio receivers requiring only a
minimum number of external components for a
complete receiver system. The rfRXD0420 covers the
receive frequency range of 300 MHz to 450 MHz and
the rfRXD0920 covers 800 MHz to 930 MHz. The
rfRXD0420 and rfRXD0920 share a common architec-
ture. They can be configured for Amplitude Shift Keying
(ASK), Frequency Shift Keying (FSK), or FM modula-
tion. The rfRXD0420/0920 are compatible with rfPIC™
and rfHCS series of RF transmitters.
• High frequency stability over temperature and
• Low spurious signal emission
• High large-signal handling capability with
• Selectable IF bandwidth via external low cost
• ASK or FSK for digital data reception
• FM modulation for analog signal reception
• FSK/FM demodulation using quadrature detector
• Received Signal Strength Indication (RSSI) for
• Wide supply voltage range
• Low active current consumption
• Very low standby current
DS70090A-page 2
power supply variations
selectable LNA gain control for improved dynamic
range
ceramic IF filter. The IF Frequency range is
selectable between 455 kHz to 21.4 MHz. This
facilitates the use of readily available low cost
10.7 MHz ceramic IF filters in a variety of
bandwidths.
(phase coincidence detector)
signal strength indication and ASK detection
DEVICE OVERVIEW
Preliminary
The rfRXD0420/0920 is a single conversion superhet-
erodyne architecture. A block diagram is illustrated in
Figure 1-1. The rfRXD0420/0920 consists of:
• Low-noise amplifier (LNA) - Gain selectable
• Mixer for down-conversion of the RF signal to the
• Fully integrated Phase-Locked Loop (PLL)
• IF limiting amplifier to amplify and limit the IF
• Demodulator (DEMOD) section consists of a
• Operational amplifier (OPA) that can be config-
• Bias circuitry for bandgap biasing and circuit
Intermediate Frequency (IF) followed by an IF
preamplifier
frequency synthesizer for generation of the Local
Oscillator (LO) signal. The frequency synthesizer
consists of:
- Crystal oscillator
- Phase-frequency detector and charge pump
- High-frequency Voltage Controlled Oscillator
- Fixed feedback divider
signal and for Received Signal Strength Indication
(RSSI) generation
phase detector (MIXER2) and amplifier creating a
quadrature detector (also known as a phase
coincidence detector) to demodulate the IF signal
in FSK and FM modulation applications
ured as a comparator for ASK or FSK data
decision or as a filter for FM modulation.
shutdown
(VCO)
- rfRXD0420 = divide by 16
- rfRXD0920 = divide by 32
 2003 Microchip Technology Inc.