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PDF T5753 Data sheet ( Hoja de datos )
| Número de pieza | T5753 | |
| Descripción | UHF ASK/FSK TRANSMITTER | |
| Fabricantes | ATMEL Corporation | |
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Features
• Integrated PLL Loop Filter
• ESD Protection (4 kV HBM/ 200 V MM; Except Pin 2: 4 kV HBM/ 100 V 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 2.0 V to 4.0 V in the Temperature Range of -40° C to 85° C/125° 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
• 125° C Operation for Tire Pressure Systems
UHF ASK/FSK
Transmitter
T5753
Description
The T5753 is a PLL transmitter IC which has been developed for the demands of RF
low-cost transmission systems at data rates up to 32 kBaud. The transmitting
frequency range is 310 MHz to 330 MHz. It can be used in both FSK and ASK
systems.
Figure 1. System Block Diagram
www.DataSheet4U.com
1 Li cell
Encoder
Keys ATARx9x
UHF ASK/FSK
Remote control transmitter
UHF ASK/FSK
Remote control receiver
T5753
XTO
PLL
VCO
U3741B/
U3745B/
T5743/
T5744
Demod.
Antenna Antenna
IF Amp
PLL
Control
XTO
1...3
Power
amp.
LNA
VCO
Rev. 4510F–RKE–07/04
1 page  
T5753
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 and the maximum output
power is delivered to a resistive load of 400 Ω if the 1.0 pF output capacitance of the
power amplifier is compensated by the load impedance.
An optimum load impedance of:
ZLoad = 400 Ω || 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 T5753’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 400 Ω where the
parallel imaginary part should be kept constant.
Output power measurement can be done with the circuit of Figure 5. Note that the com-
ponent values must be changed to compensate the individual board parasitics until the
T5753 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.
Figure 5. Output Power Measurement
VS
ANT1
ANT2
C1 = 1n
L1 = 56n
ZLopt
C2 = 3.3p
~
Z = 50 Ω
Power
meter
Rin
50 Ω
Application Circuit
For the blocking of the supply voltage a capacitor value of C3 = 68 nF/X7R is recom-
mended (see Figure 6 on page 6 and Figure 7 on page 7). C1 and C2 are used to match
the loop antenna to the power amplifier where C1 typically is 22 pF/NP0 and C2 is
10.8 pF/NP0 (18 pF + 27 pF in series); for C2 two capacitors in series should be used to
achieve a better tolerance value and to have the possibility to realize the ZLoad,opt by
using standard valued capacitors.
C1 forms together with the pins of T5753 and the PCB board wires 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 PCB. C4 should be selected that the XTO runs
on the load resonance frequency of the crystal. Normally, a value of 12 pF results for a
15 pF load-capacitance crystal.
4510F–RKE–07/04
5
5 Page 
Ordering Information
Extended Type Number
T5753-6AQ
Package Information
Package
TSSOP8L
T5753
Remarks
Taped and reeled, Marking: T573
4510F–RKE–07/04
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet T5753.PDF ] | |
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