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ATA5757 데이터시트 PDF




ATMEL Corporation에서 제조한 전자 부품 ATA5757은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 ATA5757 기능
기능 (ATA5756 / ATA5757) UHF ASK/FSK TRANSMITTER
제조업체 ATMEL Corporation
로고 ATMEL Corporation 로고


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ATA5757 데이터시트, 핀배열, 회로
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 MSOP10
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
UHF ASK/FSK
Transmitter
ATA5756
ATA5757
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 (ATA575w7w)w,.DraetaSshpeeet4Uc.ctoimvely. 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. System Block Diagram
1 Li cell
Encoder
Keys ATARx9x
UHF ASK/FSK
TPM and Remote control
transmitter
ATA5756/
ATA5757
PLL
UHF ASK/FSK
Remote control receiver
U3741B/
U3745B/
T5743/
T5744/
Demod.
Control
XTO
VCO
Antenna Antenna
IF Amp
PLL
XTO
1...3
µC
Power
amp.
LNA
VCO
Rev. 4702H–RKE–09/04




ATA5757 pdf, 반도체, 판매, 대치품
Figure 3. Block Diagram
ATA5756 /
ATA5757
CLK
1
f EN
8
ASK
2
FSK
3
OR
ANT2
4
Power up/down
f
24/
32
ENABLE
10
GND
9
PFD
CP
LF
VS
8
Ampl. OK
XTO1
XTO 7
ANT1
5
EN
PA
VCO
PLL
XTO2
6
General Description
This fully integrated PLL transmitter allows the design of simple, low-cost RF miniature
transmitters for TPM and RKE applications. The VCO is locked to 24 × fXTAL/32 × fXTAL
for ATA5756/ATA5757. Thus, a 13.125 MHz/13.56 MHz crystal is needed for a
315 MHz/433.92 MHz transmitter. All other PLL and VCO peripheral elements are
integrated.
The XTO is a series resonance (current mode) oscillator. Only one capacitor and a
crystal connected in series to GND are needed as external elements in an ASK system.
The internal FSK switch, together with a second capacitor, can be used for FSK
modulation.
The crystal oscillator needs typically 0.6 ms until the CLK output is activated if a crystal
as defined in the electrical characteristics is used (e.g., TPM crystal). For most crystals
used in RKE systems, a shorter time will result.
The CLK output is switched on if the amplitude of the current flowing through the crystal
has reached 35% to 80% of its final value. This is synchronized with the 1.64/1.69 MHz
CLK output. As a result, the first period of the CLK output is always a full period. The
PLL is then locked <250 µs after CLK output activation. This means an additional wait
time of 250 µs is necessary before the PA can be switched on and the data transmis-
sion can start. This results in a significantly 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.
4 ATA5756/ATA5757
4702H–RKE–09/04

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ATA5757 전자부품, 판매, 대치품
Transmission with
ENABLE = High
FSK Mode
ASK Mode
ATA5756/ATA5757
The ATA5756/ATA5757 is activated by ENABLE = High, FSK = High and ASK = Low.
The microcontroller 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 µs, the PLL is locked and ready to transmit.
The power amplifier is switched on with ASK = H. The ATA5756/ATA5757 is then ready
for FSK modulation. The microcontroller starts to switch on and off the capacitor
between the crystal load capacitor and GND by means of pin FSK, thus, changing the
reference frequency of the PLL. IF FSK = L the output frequency is lower, if FSK = H
output frequency is higher. After transmission, ASK is switched to Low and the micro-
controller returns back to internal clocking. Then, the ATA5756/ATA5757 is switched to
power-down mode with ENABLE = Low and FSK = Low.
Figure 6. Timing FSK Mode with ENABLE Connected to the Microcontroller
TXTO
> 250 µs
ENABLE
FSK
ASK
CLK
Power-down
Power-up,
PA off
Power-up, Power-up,
PA on
PA off
(fRF = High) (fRF = Low)
Power-down
The ATA5756/ATA5757 is activated by ENABLE = High, FSK = High and ASK = Low.
After activation 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. After transmis-
sion, ASK is switched to Low and the microcontroller returns back to internal clocking.
Then, the ATA5756/ATA5757 is switched to power-down mode with ENABLE = Low and
FSK = Low.
4702H–RKE–09/04
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관련 데이터시트

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ATA5756

(ATA5756 / ATA5757) UHF ASK/FSK TRANSMITTER

ATMEL Corporation
ATMEL Corporation
ATA5757

(ATA5756 / ATA5757) UHF ASK/FSK TRANSMITTER

ATMEL Corporation
ATMEL Corporation

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