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T5750 데이터시트 PDF




ATMEL Corporation에서 제조한 전자 부품 T5750은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 T5750 기능
기능 UHF ASK/FSK Transmitter
제조업체 ATMEL Corporation
로고 ATMEL Corporation 로고


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T5750 데이터시트, 핀배열, 회로
Features
Integrated PLL Loop Filter
ESD Protection also at ANT1/ANT2
(4 kV HBM/200V MM; Except Pin 2: 4 kV HBM/100V MM)
High Output Power (5.5 dBm) with Low Supply Current (8.5 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/+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
T5750
1. Description
The T5750 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 868 MHz to 928 MHz. It can be used in both FSK and ASK
systems.
Figure 1-1.
1 Li cell
System Block Diagram
UHF ASK/FSK
Remote control transmitter
T5750
Keys
Encoder
ATARx9x
XTO
PLL
VCO
Antenna Antenna
www.DataSheet4U.com
UHF ASK/FSK
Remote control receiver
T5760/
T5761
Demod
Control
PLL XTO
1 to 3 Micro-
controller
LNA
LNA
VCO
4546E–RKE–02/07




T5750 pdf, 반도체, 판매, 대치품
3. General Description
This fully integrated PLL transmitter allows particularly simple, low-cost RF miniature transmit-
ters to be assembled. The VCO is locked to 64 × fXTAL hence a 13.5672 MHz crystal is needed
for a 868.3 MHz transmitter and a 14.2969 MHz crystal for a 915 MHz transmitter. All other PLL
and VCO peripheral elements are integrated.
The XTO is a series resonance oscillator so that only one capacitor together with a crystal con-
nected in series to GND are needed as external elements.
The crystal oscillator together with the PLL needs typically < 1 ms until the PLL is locked and the
CLK output is stable. There is a wait time of 4 ms must be used until the CLK is used for the
microcontroller and the PA is switched on.
The power amplifier is an open-collector output delivering a current pulse which is nearly inde-
pendent from the load impedance. The delivered output power is hence controllable via the
connected load impedance.
This output configuration enables a simple matching to any kind of antenna or to 50. A high
power efficiency of η= Pout/(IS,PA × VS) of 24% for the power amplifier at 868.3 MHz results when
an optimized load impedance of ZLoad = (166 + j226)is used at 3V supply voltage.
4. Functional Description
If ENABLE = L and the PA_ENABLE = L, the circuit is in standby mode consuming only a very
small amount of current, so that a lithium cell used as power supply can work for several years.
With ENABLE = H the XTO, PLL and the CLK driver are switched on. If PA_ENABLE remains L
only the PLL and the XTO is running and the CLK signal is delivered to the microcontroller. The
VCO locks to 64 times the XTO frequency.
With ENABLE = H and PA_ENABLE = H the PLL, XTO, CLK driver and the power amplifier are
on. With PA_ENABLE the power amplifier can be switched on and off, which is used to perform
the ASK modulation.
4.1 ASK Transmission
The T5750 is activated by ENABLE = H. PA_ENABLE must remain L for t 4 ms, then the CLK
signal can be taken to clock the microcontroller and the output power can be modulated by
means of pin PA_ENABLE. After transmission PA_ENABLE is switched to L and the microcon-
troller switches back to internal clocking. The T5750 is switched back to standby mode with
ENABLE = L.
4.2 FSK Transmission
The T5750 is activated by ENABLE = H. PA_ENABLE must remain L for t 4 ms, then the CLK
signal can be taken to clock the microcontroller and the power amplifier is switched on with
PA_ENABLE = H. The chip is then ready for FSK modulation. The microcontroller starts to
switch on and off the capacitor between the XTAL load capacitor and GND with an open-drain
output port, thus changing the reference frequency of the PLL. If the switch is closed, the output
frequency is lower than if the switch is open. After transmission PA_ENABLE is switched to L
and the microcontroller switches back to internal clocking. The T5750 is switched back to
standby mode with ENABLE = L.
The accuracy of the frequency deviation with XTAL pulling method is about ±25% when the fol-
lowing tolerances are considered.
4 T5750
4546E–RKE–02/07

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T5750 전자부품, 판매, 대치품
Figure 4-3. ASK Application Circuit
S1 BPXY
S2 BPXY
ATARx9x
BPXY
OSC1
7
T5750
VDD
1
VSS
20
VS
BPXY
T5750
CLK
1
f
4
PA_ENABLE
2
Power up/down
f
64
PDF
Loop
Antenna
C2
C1
ANT2
3
CP
LF
ANT1
4
PA
L1
VCO
PLL
VS
ENABLE
8
GND
7
C3
VS
6
VS
XTO
XTAL
5
XTAL
C4
4546E–RKE–02/07
7

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