|
|
PDF ATA8404 Data sheet ( Hoja de datos )
| Número de pieza | ATA8404 | |
| Descripción | (ATA8404 / ATA8405) UHF ASK/FSK Industrial Transmitter | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ATA8404 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
Features
• PLL Transmitter IC with Single-ended Output
• High Output Power (6 dBm)
• Low Current Consumption at 8.1 mA (315 MHz) and 8.5 mA (433 MHz)
• Divide by 24 (ATA8404) and 32 (ATA8405) Blocks for 13 MHz Crystal Frequencies and
for Low XTO Start-up Times
• ASK/FSK Modulation with Internal FSK Switch
• Up to 20 kBaud Manchester Coding, Up to 40 kBaud NRZ Coding
• Power-down
• ENABLE Input for Parallel Usage of Controlling Pins
• Supply Voltage 2.0V to 3.6V
• ESD Protection at all Pins (4 kV HBM)
• Small Package TSSOP10
Benefits
• Low Parasitic FSK Switch Integrated
• Fast Settling Time < 0.85 ms
• Small Form Factor
www.DataSheet4U.com
UHF ASK/FSK
Industrial
Transmitter
ATA8404
ATA8405
Applications
• Remote Control Systems
• Alarm, Telemetering, and Energy Metering Systems
• Home Entertainment and Home Automation
• Industrial/Aftermarket Remote Keyless Entry Systems
• Toys
Preliminary
1. Description
The ATA8404/ATA8405 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 (ATA8404) and 432 MHz to 448 MHz (ATA8405), respectively.
It can be used in both FSK and ASK systems.
Figure 1-1. System Block Diagram
1 Li cell
Encoder
Keys ATARx9x
UHF ASK/FSK
TPM and Remote control
transmitter
UHF ASK/FSK
Remote control receiver
ATA8404
ATA8405
PLL
ATA8201
ATA8202
ATA8203
ATA8204
Demod.
Control
XTO
VCO
Antenna Antenna
IF Amp
PLL
XTO
1...3
µC
Power
amp.
LNA VCO
9136C–INDCO–10/09
1 page  
ATA8404/ATA8405 [Preliminary]
www.DataSheet4U.com
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 50Ω. A high
power efficiency for the power amplifier results if an optimized load impedance of
ZLoad, opt = 380Ω + j340Ω (ATA8404) at 315 MHz and ZLoad, opt = 280Ω + j310Ω (ATA8405) 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
consuming 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, 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 crys-
tal 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 syn-
chronously 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 acti-
vated, 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 ATA8404/ATA8405 are listed in Table 4-1, the corresponding cur-
rent consumption values can be found in the table “Electrical Characteristics” on page 15.
Table 4-1.
ASK Pin
Low
Low
Low
High
High
Low/High
High
ATA8404/ATA8405 Modes
FSK Pin
ENABLE Pin
Low Low/open
Low High
High
High/open
Low High/open
High
High/open
High
Low
Low/High
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
Idle mode, FSK switch High Z
9136C–INDCO–10/09
5
5 Page 
ATA8404/ATA8405 [Preliminary]
www.DataSheet4U.com
4.6 Application Circuits
For the supply voltage blocking capacitor C3, a value of 68 nF/X7R is recommended (see Fig-
ure 4-7 on page 12 and Figure 4-8 on page 13). C1 and C2 are used to match the loop antenna
to the power amplifier. For C2, two capacitors in series should be used to achieve a better tol-
erance value and to enable it to realize ZLoad,opt by using capacitors with standard values.
Together with the pins of ATA8404 and the PCB board wires, C1 forms a series resonance loop
that suppresses the 1st harmonic, hence the position of C1 on the PCB is important. Normally,
the best suppression is achieved when C1 is placed as close as possible to the pins ANT1 and
ANT2.
The loop antenna should not exceed a width of 1.5 mm, otherwise the Q-factor of the loop
antenna is too high.
L1 (50 nH to 100 nH) can be printed on the PCB. C4 should be selected so that the XTO runs
on the load resonance frequency of the crystal. Normally, a value of 10 pF results in a 12 pF
load-capacitance crystal due to the board parasitic capacitances and the inductive impedance
of the XTO1 pin.
9136C–INDCO–10/09
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ATA8404.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ATA8401 | UHF ASK/FSK Industrial Transmitter | ATMEL Corporation |
| ATA8402 | UHF ASK/FSK Industrial Transmitter | ATMEL Corporation |
| ATA8403 | UHF ASK/FSK Industrial Transmitter | ATMEL Corporation |
| ATA8404 | (ATA8404 / ATA8405) UHF ASK/FSK Industrial Transmitter | ATMEL Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |