07-06-2013, 12:57 PM
433 MHz RF Transmitter STT-433
[attachment=54935]
Overview
The STT-433 is ideal for remote control applications where low
cost and longer range is required. The transmitter operates from a
1.5-12V supply, making it ideal for battery-powered applications.
The transmitter employs a SAW-stabilized oscillator, ensuring
accurate frequency control for best range performance. Output
power and harmonic emissions are easy to control, making FCC
and ETSI compliance easy. The manufacturing-friendly SIP style
package and low-cost make the STT-433 suitable for high volume
applications.
Features
· 433.92 MHz Frequency
· Low Cost
· 1.5-12V operation
· 11mA current consumption at 3V
· Small size
· 4 dBm output power at 3V
Applications
· Remote Keyless Entry (RKE)
· Remote Lighting Controls
· On-Site Paging
· Asset Tracking
· Wireless Alarm and Security Systems
· Long Range RFID
· Automated Resource Management
Operation
Theory
OOK(On Off Keying) modulation is a binary form of amplitude modulation. When a logical 0 (data line
low) is being sent, the transmitter is off, fully suppressing the carrier. In this state, the transmitter current
is very low, less than 1mA. When a logical 1 is being sent, the carrier is fully on. In this state, the module
current consumption is at its highest, about 11mA with a 3V power supply.
OOK is the modulation method of choice for remote control applications where power consumption and
cost are the primary factors. Because OOK transmitters draw no power when they transmit a 0, they
exhibit significantly better power consumption than FSK transmitters.
OOK data rate is limited by the start-up time of the oscillator. High-Q oscillators which have very stable
center frequencies take longer to start-up than low-Q oscillators. The start-up time of the oscillator
determines the maximum data rate that the transmitter can send.
[attachment=54935]
Overview
The STT-433 is ideal for remote control applications where low
cost and longer range is required. The transmitter operates from a
1.5-12V supply, making it ideal for battery-powered applications.
The transmitter employs a SAW-stabilized oscillator, ensuring
accurate frequency control for best range performance. Output
power and harmonic emissions are easy to control, making FCC
and ETSI compliance easy. The manufacturing-friendly SIP style
package and low-cost make the STT-433 suitable for high volume
applications.
Features
· 433.92 MHz Frequency
· Low Cost
· 1.5-12V operation
· 11mA current consumption at 3V
· Small size
· 4 dBm output power at 3V
Applications
· Remote Keyless Entry (RKE)
· Remote Lighting Controls
· On-Site Paging
· Asset Tracking
· Wireless Alarm and Security Systems
· Long Range RFID
· Automated Resource Management
Operation
Theory
OOK(On Off Keying) modulation is a binary form of amplitude modulation. When a logical 0 (data line
low) is being sent, the transmitter is off, fully suppressing the carrier. In this state, the transmitter current
is very low, less than 1mA. When a logical 1 is being sent, the carrier is fully on. In this state, the module
current consumption is at its highest, about 11mA with a 3V power supply.
OOK is the modulation method of choice for remote control applications where power consumption and
cost are the primary factors. Because OOK transmitters draw no power when they transmit a 0, they
exhibit significantly better power consumption than FSK transmitters.
OOK data rate is limited by the start-up time of the oscillator. High-Q oscillators which have very stable
center frequencies take longer to start-up than low-Q oscillators. The start-up time of the oscillator
determines the maximum data rate that the transmitter can send.