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PDF ATA8401 Data sheet ( Hoja de datos )
| Número de pieza | ATA8401 | |
| Descripción | UHF ASK/FSK Industrial Transmitter | |
| Fabricantes | ATMEL Corporation | |
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Features
• Integrated PLL Loop Filter
• ESD Protection (4 kV HBM/200V MM; Except Pin 2: 4 kV HBM/100V MM)
also at ANT1/ANT2
• High Output Power (8.0 dBm) with Low Supply Current (9.0 mA)
• Modulation Scheme ASK/FSK
– FSK Modulation is Achieved by Connecting an Additional Capacitor Between the
XTAL Load Capacitor and the Open Drain Output of the Modulating Microcontroller
• Easy to Design-in Due to Excellent Isolation of the PLL from the PA and Power Supply
• Single Li-cell for Power Supply
• Supply Voltage 2.0V to 4.0V in the Temperature Range of –40°C to +85°C
• Package TSSOP8L
• Single-ended Antenna Output with High Efficient Power Amplifier
• CLK Output for Clocking the Microcontroller
• One-chip Solution with Minimum External Circuitry
Applications
• Industrial/Aftermarket Remote Keyless Entry Systems
• Alarm, Telemetering, and Energy Metering Systems
• Remote Control Systems for Consumer and Industrial Markets
• Access Control Systems
• Home Automation
• Home Entertainment
• Toys
www.DataSheet4U.com
1. Description
The ATA8401 is a PLL transmitter IC, which has been developed for the demands of
RF low-cost transmission systems for industrial applications at data rates up to
50 kBaud ASK and 32 kBaud FSK modulation scheme. The transmitting frequency
range is 310 MHz to 350 MHz. It can be used in both FSK and ASK systems.
Figure 1-1. System Block Diagram
1 Li cell
Keys
Encoder
ATARx9x
UHF ASK/FSK
Remote control transmitter
UHF ASK/FSK
Remote control receiver
ATA8401
PLL
XTO
VCO
Antenna Antenna
ATA3741/
ATA3745/
ATA5743/
ATA5744/
ATA8201
Demod
IF Amp
Control
1 to 3 Micro-
controller
PLL XTO
LNA
LNA
VCO
UHF ASK/FSK
Industrial
Transmitter
ATA8401
4984A–IND–02/07
1 page  
ATA8401
Figure 4-1. Tolerances of Frequency Modulation
VS
XTAL
CStray1
LM
CM
RS
CStray2
C4
C0
Crystal equivalent circuit
C5
CSwitch
Using C4 = 8.2 pF ±5%, C5 = 10 pF ±5%, a switch port with CSwitch = 3 pF ±10%, stray capaci-
tances on each side of the crystal of CStray1 = CStray2 = 1 pF ±10%, a parallel capacitance of the
crystal of C0 = 3.2 pF ±10%, and a crystal with CM = 13 fF ±10%, typically results in an FSK devi-
ation of ±21.5 kHz with worst case tolerances of ±16.25 kHz to ±28.01 kHz.
4.3 CLK Output
An output CLK signal is provided for a connected microcontroller. The delivered signal is CMOS
compatible if the load capacitance is lower than 10 pF.
4.3.1
Clock Pulse Take-over
The clock of the crystal oscillator can be used for clocking the microcontroller. A special feature
of Atmel®’s ATARx9x is that it starts with an integrated RC-oscillator to switch on the ATA8401
with ENABLE = H, and after 1 ms assumes the clock signal of the transmission IC, so that the
message can be sent with crystal accuracy.
4.3.2
Output Matching and Power Setting
The output power is set by the load impedance of the antenna. The maximum output power is
achieved with a load impedance of ZLoad,opt = (255 + j192)Ω. There must be a low resistive path
to VS to deliver the DC current.
The delivered current pulse of the power amplifier is 9 mA. The maximum output power is deliv-
ered to a resistive load of 400Ω if the 1.0 pF output capacitance of the power amplifier is
compensated by the load impedance.
An optimum load impedance of:
ZLoad = 400Ω || j/(2 × π 1.0 pF) = (255 + j192)Ω thus results for the maximum output power of
8 dBm.
The load impedance is defined as the impedance seen from the ATA8401’s ANT1, ANT2 into
the matching network. Do not confuse this large signal load impedance with a small signal input
impedance delivered as input characteristic of RF amplifiers and measured from the application
into the IC instead of from the IC into the application for a power amplifier.
Less output power is achieved by lowering the real parallel part of 400Ω where the parallel imag-
inary part should be kept constant.
Output power measurement can be done with the circuit shown in Figure 4-2. Note that the com-
ponent values must be changed to compensate for the individual board parasitics until the
ATA8401 has the right load impedance ZLoad,opt = (255 + j192)Ω. Also the damping of the cable
used to measure the output power must be calibrated out.
4984A–IND–02/07
5
5 Page 
8. Ordering Information
Extended Type Number
ATA8401-6AQY
Package
TSSOP8L
9. Package Information
Package: TSSOP 8L
Dimensions in mm
ATA8401
MOQ
5000 pcs
Remarks
Taped and reeled, Pb-free
3±0.1
3±0.1
+0.06
0.31-0.07
0.65 nom.
3 x 0.65 = 1.95 nom.
8
5
Drawing-No.: 6.543-5083.01-4
Issue: 2; 15.03.04
14
3.8±0.3
4.9±0.1
technical drawings
according to DIN
specifications
4984A–IND–02/07
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ATA8401.PDF ] | |
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