Rainbow Electronics T5761 - Manual

1
Features
• Frequency Receiving Range of
f
0
= 868 MHz to 870 MHz or f
0
= 902 MHz to 928 MHz
• 30 dB Image Rejection
• Receiving Bandwidth B
IF
= 600 kHz for Low Cost 90-ppm Crystals
• Fully Integrated LC-VCO and PLL Loop Filter
• Very High Sensitivity with Power Matched LNA
• High System IIP3 (-16 dBm), System 1-dB Compression Point (-25 dBm)
• High Large-signal Capability at GSM Band
(Blocking -30 dBm at +20 MHz, IIP3 = -12 dBm at +20 MHz)
• 5 V to 20 V Automotive Compatible Data Interface
• Data Clock Available for Manchester- and Bi-phase-coded Signals
• Programmable Digital Noise Suppression
• Low Power Consumption Due to Configurable Polling
• Temperature Range -40 °C to +105°C
• ESD Protection 2 kV HBM, All Pins
• Communication to Microcontroller Possible Via a Single Bi-directional Data Line
• Low-cost Solution Due to High Integration Level with Minimum External Circuitry
Requirements
Description
The T5760/T5761 is a multi-chip PLL receiver device supplied in an SO20 package. It
has been especially developed for the demands of RF low-cost data transmission
systems with data rates from 1 kBaud to 10 kBaud in Manchester or Bi-phase code.
The receiver is well suited to operate with the Atmel’s PLL RF transmitter T5750. Its
main applications are in the areas of telemetering, security technology and keyless-
entry systems. It can be used in the frequency receiving range of f
0
= 868 MHz to
870 MHz or f
0
= 902 MHz to 928 MHz for ASK or FSK data transmission. All the state-
ments made below refer to 868.3 MHz and 915.0 MHz applications.
Figure 1. System Block Diagram
Demod.
IF Amp
LNA VCO
PLL XTO
Control
T5760/
T5761
1...5
µC
Power
amp.
XTO
VCO
PLL
T5750
Antenna Antenna
UHF ASK/FSK
Remote control transmitter
UHF ASK/FSK
Remote control receiver
UHF ASK/FSK
Receiver
T5760/T5761
Preliminary
Rev. 4561B–RKE–10/02