Rainbow Electronics T5754 - Manual

1
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 (7.5 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
Description
The T5754 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 429 MHz to 439 MHz. It can be used in both FSK and ASK
systems.
Figure 1. System Block Diagram
Demod.
IF Amp
LNA VCO
PLL XTO
Control
U3741B/
U3745B/
T5743/
T5744
1...3
µC
Power
amp.
XTO VCO
PLL
T5754
Antenna Antenna
UHF ASK/FSK
Remote control transmitter
UHF ASK/FSK
Remote control receiver
Encoder
M44Cx9x
1 Li cell
Keys
UHF ASK/FSK
Transmitter
T5754
Preliminary
Rev. 4511D–RKE–08/02