ATA5757-6DQJ Atmel, ATA5757-6DQJ Datasheet

RF Transmitter ASK/FSK Transmitter 433MHz TPMS

ATA5757-6DQJ

Manufacturer Part Number
ATA5757-6DQJ
Description
RF Transmitter ASK/FSK Transmitter 433MHz TPMS
Manufacturer
Atmel
Type
Transmitterr
Datasheet

Specifications of ATA5757-6DQJ

Package / Case
TSSOP-10
Operating Frequency
448 MHz
Mounting Style
SMD/SMT
Operating Supply Voltage
2.5 V, 3.3 V
Operating Temperature (min)
-40C
Operating Temperature (max)
125C
Operating Temperature Classification
Automotive
Operating Supply Voltage (typ)
2.5/3.3V
Operating Supply Voltage (max)
3.6V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
Benefits
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.
Keys
1 Li cell
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
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
ATARx9x
Encoder
System Block Diagram
TPM and Remote control
ATA5756/
ATA5757
XTO
UHF ASK/FSK
transmitter
Power
PLL
VCO
amp.
Antenna Antenna
U3741B/
U3745B/
T5743/
T5744/
LNA
Remote control receiver
Demod.
IF Amp
UHF ASK/FSK
VCO
PLL
Control
XTO
1...3
µC
UHF ASK/FSK
Transmitter
ATA5756
ATA5757
4702J–RKE–09/08

Related parts for ATA5757-6DQJ

ATA5757-6DQJ Summary of contents

Page 1

... 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 • ...

Page 2

... Switches off the FSK switch (switch has high Z if signal at pin FSK is High) and 3 FSK enables the PLL and the XTO if the ENABLE pin is open ATA5756/ATA5757 CLK ASK 2 9 ATA5756 FSK 3 8 ATA5757 ANT2 4 7 ANT1 5 6 /8. XTAL ENABLE GND VS XTO1 XTO2 Configuration VS 100 CLK ...

Page 3

... If ENABLE is connected to GND and the ASK or FSK pin is High, the device 10 ENABLE stays in idle mode. In normal operation ENABLE is left open and ASK or FSK is used to enable the device. 4702J–RKE–09/08 ATA5756/ATA5757 Configuration (FSK < 0.25V) AND (ENABLE > 1.7V) XTO2 VS 1.5k XTO1 182 µA ...

Page 4

... CLK output activation. This means an additional wait time of ≥250 µs is necessary before the PA can be switched on and the data transmission can start. This results in a signifi- cantly lower time of about 0.85 ms between enabling the ATA5756/ATA5757 and the beginning of the data transmission which saves battery power especially in tire pressure monitoring systems ...

Page 5

... 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 consumption values can be found in the table Table 4-1. ...

Page 6

... Transmission with ENABLE = open 4.1.1 ASK Mode The ATA5756/ATA5757 is activated by ENABLE = open, FSK = High, ASK = Low. The microcon- troller is then switched to external clocking. After typically 0.6 ms, the CLK driver is activated automatically (i.e., the microcontroller waits until the XTO and CLK are ready). After another time period of modulated by means of pin ASK ...

Page 7

... Figure 4-3. 4.2.2 ASK Mode The ATA5756/ATA5757 is activated by ENABLE = High, FSK = High and ASK = Low. After acti- vation the microcontroller is switched to external clocking. After typically 0.6 ms, the CLK driver is activated automatically (the microcontroller waits until the XTO and CLK are ready). After another time period of then be modulated by means of pin ASK ...

Page 8

... Using a crystal with a motional capacitance LNOM = 297 × internal FSK switch with C the resulting C deviation of ±19.3 kHz with worst case tolerances of ±15.8 kHz to ±23.2 kHz. ATA5756/ATA5757 8 Timing ASK Mode with ENABLE Connected to the Microcontroller ΔT XTO ENABLE FSK ASK CLK Power-up, ...

Page 9

... The clock of the crystal oscillator can be used for clocking the microcontroller. Atmel’s ATARx9x microcontroller family provides the special feature of starting with an integrated RC oscillator to switch on the ATA5756/ATA5757’s external clocking and to wait automatically until the CLK out- put of the ATA5756/ATA5757 is activated. After a time period of 250 µs the message can be sent with crystal accuracy. 4.5.2 Output Matching and Power Setting The output power is set by the load impedance of the antenna ...

Page 10

... The 0.66 pF output capacitance absorbed into the load impedance a real impedance of 684 Ω (ATA5756) at 315 MHz and 623 Ω (ATA5757) at 433.92 MHz should be measured with a net- work analyses at pin 5 (ANT1) with the ATA5756/ATA5757 soldered, an optimized antenna connected and the power amplifier switched off. ...

Page 11

... Load,opt st harmonic, hence the position placed as close as possible to the pins ANT1 and 1 ATA5756/ATA5757 are used to match the loop antenna series resonance loop 1 forms on the PCB is important. Normally, 1 should be selected so that the XTO runs on ...

Page 12

... Figure 4-7. ASK Application Circuit Loop C1 Antenna L1 VS ATA5756/ATA5757 12 BPXY ATARx9x BPXY BPXY OSC1 7 ATA5756/ATA5757 Power up/down EN CLK 24/ ASK PFD FSK 3 CP ANT2 ANT1 5 VCO PA PLL VDD 1 VS VSS 20 BPXY ENABLE 10 GND Ampl. OK XTO1 XTAL 7 XTO C4 XTO2 6 4702J–RKE–09/08 ...

Page 13

... Figure 4-8. FSK Application Circuit Loop C1 Antenna L1 VS 4702J–RKE–09/08 BPXY ATARx9x BPXY BPXY OSC1 7 ATA5756/ATA5757 Power up/down EN CLK 24/ ASK PFD FSK 3 CP ANT2 ANT1 5 VCO PA PLL ATA5756/ATA5757 VDD 1 VS VSS 20 BPXY ENABLE 10 GND Ampl. OK XTO1 XTAL XTO 7 XTO2 ...

Page 14

... S V < 0. ENABLE is open, ENABLE V < 0. < 0.25 V ASK FSK Input voltage Note 0.3 is higher than 3.7 V, the maximum voltage will be reduced to 3 Thermal Resistance Parameters Junction ambient ATA5756/ATA5757 14 ASK FSK Symbol tot stg T amb1 ≤ 3 amb2 ...

Page 15

... ATA5756 /24 XTO 0 ATA5757 /32 XTO resonant frequency of the XTAL = 4.37 fF, load capacitance XTAL selected accordingly T = -40°C to +85°C amb T = -40°C to +125°C amb ATA5756/ATA5757 ≤ Ω Symbol Min. Typ S_Off I S_IDLE I 3 S_Transmit1 8.1 8.5 I S_Transmit2 8.4 8 Out ...

Page 16

... Time between the activation of CLK and when the PLL is locked (transmitter ready for data transmission) 25 kHz distance to carrier at 1 MHz at 36 MHz ATA5756 ATA5757 ATA5756 ATA5757 ≤ 20 pF, High = 0.8 × Vs, C Load Low = 0.2 × < 1.7 MHz S CLK For proper detection of the XTO ...

Page 17

... Low level input voltage High level input voltage Input current high Low level input voltage High level input voltage Input current high Low level input voltage High level input voltage Input current high Input current Low ATA5756/ATA5757 ≤ Ω Symbol Min. Typ ...

Page 18

... Ordering Information Extended Type Number ATA5756-6DQY ATA5756-6DPY ATA5757-6DQY ATA5757-6DPY 9. Package Information TSSOP10 Package: TSSOP 10 (acc. to JEDEC Standard MO-187) Dimensions in mm Not indicated tolerances ± 0.05 0.5 nom 0 nom. ATA5756/ATA5757 18 Package Remarks TSSOP10 Pb-free TSSOP10 Pb-free 3 ±0.1 0. ±0.1 3.8 ±0.3 4.9 ±0.1 ...

Page 19

... ATA5756/ATA5757 History • Put datasheet in a new template • Page1: PB-free logo deleted • Page 18: Ordering Information changed • Put datasheet in a new template • First page: Pb-free logo added • Page 18: Ordering Information and package drawing changed • ...

Page 20

... Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDI- TIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ...

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