TR-916-SC-PA Linx Technologies Inc, TR-916-SC-PA Datasheet - Page 8

• Manufacturer Part Number: TR-916-SC-PA
• Description: TRANSCEIVER RF 916MHZ 1/2-DUPLEX
• Manufacturer: Linx Technologies Inc
• Series: SCr

Specifications of TR-916-SC-PA

• Frequency: 916MHz
• Data Rate - Maximum: 33.6kbps
• Modulation Or Protocol: FM, FSK
• Applications: ISM, Garage Door Opener, Remote Controls, 2-way RKE
• Power - Output: -10dBm
• Sensitivity: -94dBm
• Voltage - Supply: 2.7 V ~ 13 V
• Current - Receiving: 15mA
• Current - Transmitting: 19mA
• Data Interface: PCB, Through Hole
• Antenna Connector: RP-SMA
• Operating Temperature: 0°C ~ 70°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -
• Other names: TR-900-SC-PA; TR-900-SC-PA

TIMING CONSIDERATIONS
A TYPICAL SYSTEM EXAMPLE
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There are three general areas of timing that are important to consider when
designing with the transceiver: the actual time value for each is listed under the
“Performance Specifications” section of this document.
1. Start-up time
Start-up time is the time to transmitter or receiver readiness from the application
of power to the VIN pin on the PDN pin going high.
Transmitter readiness is defined as the presence of a fully locked carrier.
Receiver readiness is determined by valid data at the RXDATA pin. (This
assumes an incoming data stream.)
2. Mode turnaround time
This is the time taken by a powered-up module to switch between modes.
The RX-to-TX time is measured as the time from the TXEN pin going high and
the RXEN pin going low to the transmitter being ready to transmit data. Here
again, transmitter readiness is defined as the presence of a fully locked carrier.
The TX-to-RX time is measured as the time from the RXEN pin going high and
the TXEN pin going low to the receiver’s data output being valid. (This assumes
valid incoming data.)
It is important to note that TXEN and RXEN should never be high at the same
time. This will invalidate the timing parameters and may cause illegal emissions
from the transceiver.
3. Required transition interval.
This is the maximum amount of time that can elapse without a transition on the
TX data pin.
It is always important to think of data in both the analog and the digital domain.
Because the data stream is asynchronous and no particular format is imposed,
it is possible for the data to meet the baud-rate requirements of the module and
yet violate the analog frequency parameters. For example, if a 255 (0FF hex) is
being sent continuously the receiver would view the data as a DC level. The
receiver would hold that level until a transition was required to meet the minimum
frequency requirement. If no transition occurred, data integrity could not be
guaranteed. Thus, while no particular signal structure or code-balancing
requirement is imposed, the designer must insure that both analog and digital
signals have transitions suitable to meet the required transition interval
specification.
To properly apply the transceiver, it is critical to understand and respect the
differences that exist between a wired and a wireless environment. At every
point in this system, there are timing and data-corruption issues that should be
understood and accounted for. The following section provides a basic outline of
the typical flow of events in a link incorporating SC-PA modules. While there are
many alternate methodologies, this section illustrates many of the considerations
previously mentioned.