ata5756-6dqy

Manufacturer Part Numberata5756-6dqy
DescriptionAta5756 Uhf Ask/fsk Transmitter
ManufacturerATMEL Corporation
ata5756-6dqy datasheet
 
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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
ATA5756)
Divide by 24 (
and 32 (
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
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 Manches-
ter 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 settling 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
1 Li cell
ATA5756/
ATA5757
Encoder
PLL
ATARx9x
Keys
XTO
VCO
Power
amp.
ATA5757
) Blocks for 13 MHz Crystal Frequencies and
UHF ASK/FSK
Remote control receiver
U3741B/
U3745B/
Demod.
T5743/
T5744/
IF Amp
Antenna Antenna
PLL
LNA
VCO
UHF ASK/FSK
Transmitter
ATA5756
ATA5757
1...3
Control
µC
XTO
Rev. 4702I–RKE–11/05

ata5756-6dqy Summary of contents

  • Page 1

    ... RF low-cost transmission systems at data rates kBaud Manches- ter 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 settling time it is well suited for Tire Pressure Monitoring (TPM) and for Passive Entry Go applications ...

  • 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 ...

  • Page 3

    ... ENABLE input 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. 4702I–RKE–11/05 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 250 µ ...

  • 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 250 µs, the PLL is locked and ready to transmit. The output power can then be modulated by means of pin ASK ...

  • Page 8

    ... Figure 4-5. Using a crystal with a motional capacitance LNOM C = 297 0 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 T 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

    ... Output power measurement can be done with the circuit as shown in that the component values must be changed to compensate the individual board parasitics until the ATA5756/ATA5757 has the right load impedance. Also, the damping of the cable used to measure the output power must be calibrated. Figure 4-6. ...

  • Page 11

    ... For the supply voltage blocking capacitor C 4-7 on page 12 the power amplifier. For C ance value and to enable it to realize Z Together with the pins of ATA5756 and the PCB board wires, C that suppresses the 1 the best suppression is achieved when C ANT2. The loop antenna should not exceed a width of 1.5 mm, otherwise the Q-factor of the loop antenna is too high ...

  • 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 ...

  • Page 13

    ... L1 VS 4702I–RKE–11/05 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 ANT1 ASK FSK ANT2 Symbol tot stg T amb1 3.2 V ...

  • Page 15

    ... ATA5756 /24 XTO 0 ATA5757 /32 XTO resonant frequency of the XTAL XTAL, C 4.37 fF, load capacitance M selected accordingly T = -40°C to +85°C amb T = -40°C to +125°C amb ATA5756/ATA5757 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

    ... Current flowing through the crystal in steady state oscillation (peak-to-peak value) 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 C 20 pF, High = 0.8 Vs, Load Low = 0 < 1.7 MHz S CLK ...

  • 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 Symbol Min. Typ ...

  • Page 18

    ... Ordering Information Extended Type Number ATA5756-6DQY ATA5756-6DPJ ATA5757-6DQJ 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 ± ...

  • Page 19

    ... ATA5756/ATA5757 History Put datasheet in a new template First page: Pb-free logo added Page 18: Ordering Information and package drawing changed Electrical Characteristics table, page 15, row “Output power for the full...”. -> maximum value changed Electrical Characteristics table, page 15, row “ ...

  • Page 20

    ... Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. © Atmel Corporation 2005. All rights reserved. Atmel marks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Atmel Operations Memory ...