ATA5757-DDW datasheet, PDF - EEWORLD Datasheet

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ATA5757-DDW: Descriptionmosfet and power driver IC ask/fsk transmitter 433mhz tpms; Categorysemiconductor Other integrated circuit (IC); File Size328KB，20 Pages; ManufacturerAtmel (Microchip); Environmental Compliance

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ATA5757-DDW Overview

mosfet and power driver IC ask/fsk transmitter 433mhz tpms

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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 (ATA5756) and 32 (ATA5757) Blocks for 13 MHz Crystal Frequencies and

•

for Low XTO Start-up Times

Modulation Scheme ASK/FSK with Internal FSK Switch

Up to 20 kBaud Manchester Coding, Up to 40 kBaud 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

Supply Voltage 2.0 V to 3.6 V in Operation Temperature Range of -40°C to +125°C

ESD Protection at all Pins (4 kV HBM)

Small Package TSSOP10

UHF ASK/FSK

Transmitter

ATA5756

ATA5757

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

1. Description

The ATA5756/ATA5757 is a PLL transmitter IC which has been developed for the

demands of RF low-cost transmission systems at data rates up to 20 kBaud Man-

chester coding and 40 kBaud NRZ coding. The transmitting frequency range is

313 MHz to 317 MHz (ATA5756) and 432 MHz to 448 MHz (ATA5757), respectively.

It can be used in both FSK and ASK systems. Due to its shorten crystal oscillator set-

tling time it is well suited for Tire Pressure Monitoring (TPM) and for Passive Entry Go

applications.

Figure 1-1.

System Block Diagram

UHF ASK/FSK

TPM and Remote control

transmitter

UHF ASK/FSK

Remote control receiver

1 Li cell

ATA5756/

ATA5757

PLL

Antenna Antenna

XTO

VCO

Keys

Encoder

ATARx9x

U3741B/

U3745B/

T5743/

T5744/

Demod.

Control

1...3

µC

IF Amp

PLL

XTO

Power

amp.

LNA

VCO

4702J–RKE–09/08

ATA5756/ATA5757

The power amplifier is an open-collector output delivering a current pulse which is nearly inde-

pendent from the load impedance and can therefore be controlled via the connected load

impedance.

This output configuration enables a simple matching to any kind of antenna or to 50

Ω.

A high

power efficiency for the power amplifier results if an optimized load impedance of

Load, opt

= 380

+ j340

(ATA5756) at 315 MHz and Z

Load, opt

= 280

+ j310

(ATA5757) at

433.92 MHz is used at the 3-V supply voltage.

4. Functional Description

If ASK = Low, FSK = Low and ENABLE = open or Low, the circuit is in power-down mode con-

suming only a very small amount of current so that a lithium cell used as power supply can work

for many years.

If the ENABLE pin is left open, ENABLE is the logical OR operation of the ASK and FSK input

pins. This means, the IC can be switched on by either the FSK of the ASK input.

If the ENABLE pin is Low and ASK or FSK are High, the IC is in idle mode where the PLL, XTO

and power amplifier are off and the microcontroller ports controlling the ASK and FSK inputs can

be used to control other devices. This can help to save ports on the microcontroller in systems

where other devices with 3-wire interface are used.

With FSK = High and ASK = Low and ENABLE = open or High, the PLL and the XTO are

switched on and the power amplifier is off. When the amplitude of the current through the crystal

has reached 35% to 80% of its final amplitude, the CLK driver is automatically activated. The

CLK output stays Low until the CLK driver has been activated. The driver is activated synchro-

nously with the CLK output frequency, hence, the first pulse on the CLK output is a complete

period. The PLL is then locked within <250 µs after the CLK driver has been activated, and the

transmitter is then ready for data transmission.

With ASK = High the power amplifier is switched on. This is used to perform the ASK modula-

tion. During ASK modulation the IC is enabled with the FSK or the ENABLE pin.

With FSK = Low the switch at pin XTO2 is closed, with FSK = High the switch is open. To

achieve a faster start-up of the crystal oscillator, the FSK pin should be High during start-up of

the XTO because the series resistance of the resonator seen from pin XTO1 is lower if the

switch is off.

The different modes of the ATA5756/ATA5757 are listed in

Table 4-1,

the corresponding current

consumption values can be found in the table

“Electrical Characteristics” on page 15.

Table 4-1.

ASK Pin

Low

High

Low/High

High

ATA5756/ATA5757 Modes

FSK Pin

Low

High

Low

High

Low/High

ENABLE Pin

Low/open

High

High/open

Low

Mode

Power-down mode, FSK switch High Z

Power-up, PA off, FSK switch Low Z

Power-up, PA off, FSK switch High Z

Power-up, PA on, FSK switch Low Z

Power-up, PA on, FSK switch High Z

Idle mode, FSK switch High Z

4702J–RKE–09/08

ATA5757-DDW Related Products

	ATA5757-DDW	ATA5757-6DQY 71	ATA5756-6DQY71	ATA5757-6DQJ
Description	mosfet and power driver IC ask/fsk transmitter 433mhz tpms	RF transmitter ask/fsk transmitter 433mhz tpms	RF transmitter ask/fsk transmitter 315mhz tpms	RF transmitter ask/fsk transmitter 433mhz tpms

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