Rainbow-electronics ATA6286 Manual de usuario descargar pdf (Pagina 10)

4958AS–AUTO–09/06

ATA6285/ATA6286 [Preliminary]

4. UHF ASK/FSK Transmitter for ATA6285/ATA6286

4.1 Features

• PLL Transmitter IC with Single-ended Output

• High output Power (6 dBm) at 8.1 mA (315 MHz) and 8.5 mA (433 MHz) Typical Values

• Divide by 24 (ATA6285) and 32 (ATA6286) Blocks for 13 MHz Crystal Frequencies and for Low XTO

Start-up Times

• Modulation Scheme ASK/FSK with Internal FSK Switch

• Up to 20 Kbits/s Manchester Coding, Up to 40 Kbits/s NRZ Coding

• Power-down Idle and Power-up Modes to Adjust Corresponding Current Consumption through

ASK/FSK/Enable Input Pins

• ENABLE Input for Parallel Usage of Controlling Pins in a 3-wire Bus System

• CLK Output Switches ON if the Crystal Current Amplitude Has Reached 35% to 80% of its Final

Value

• Crystal Oscillator Time until CLK Output Is Activated, Typically 0.6 ms

4.2 Benefits

• Low Parasitic FSK Switch Integrated

• Very Short and Reproducible Time to Transmit Typically < 0.85 ms

• 13.125 MHz/13.56 MHz Crystals Give Opportunity for Small Package Sizes

4.3 Description

The ATA6285/ATA6286 is a PLL transmitter part which has been developed for the demands of

RF low-cost transmission systems at data rates up to 20 Kbits/s Manchester coding and

40 Kbits/s NRZ coding. The transmitting frequency range is 313 MHz to 317 MHz (ATA6285)

and 432 MHz to 448 MHz (ATA6286), respectively. It can be used in both FSK and ASK sys-

tems. Due to its shorten crystal oscillator settling time it is well suited for Tire Pressure

Monitoring (TPMS) and for Passive Entry Go applications.

Figure 4-1. System Block Diagram

Power

amp.

(LNA, Mixer,

VCO, PLL,

IF Filter,

RSSI Amp.,

Demodulator)

Micro-

controller

Interface

Micro-

controller

Digital

Control

Logic

Power

Supply

RF Receiver

PLL

UHF ASK/FSK ReceiverUHF ASK/FSK TPM

Transmitter Part of

ATA6285/ATA6286

VCO

XTO

Antenna

4 to 8

Encoder

ATARx9x

VCO

1 Li cell

Keys

Antenna

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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Rainbow-electronics ATA6286 Manual de usuario Pagina 10

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