HIGH-PERFORMANCE
SC-PA
PRE-CERTIFIED
RF TRANSCEIVER
SC-PA SERIES TRANSCEIVER MODULE DESIGN GUIDE
DESCRIPTION:
The PA version of Linx popular SC Series greatly reduces the time and
expense of making a product wireless. This is because the transceiver
module is pre-approved by the FCC when used with the appropriate
proprietary antennas.The TR-XXX-SC-PA transceiver module is
designed for the cost-effective, bi-directional transfer of wireless
information. The Transceiver utilizes an advanced synthesized
superhet architecture and has direct interface for analog or digital
information, UART-compatible data output, RSSI, low power
consumption, wide operational voltage, on-board TX/RX switch, SAW
front-end filter, and many other useful features. Fast turnaround times,
along with the support for data rates to 33.6Kbps, make the
transceiver suitable for a wide range of applications. Housed in a
compact through-hole package, the transceiver requires no tuning or
external RF components (except antenna), allowing for straightforward
application, even by engineers lacking previous RF experience.
0.175"
1.10"
0.375"
0.90"
Nomenclature Area
∅
.325"
1.50"
0.05"
0.425"
1.300"
To Pin Centers
0.13"
0.022"
0.10"
F E AT U R E S
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FCC precertified for immediate integration
Direct interface for analog or digital information
Precision crystal-controlled synthesized architecture
Transparent serial input
UART-compatible data output
Built-in data squelching
High data-rate: up to 33,600bps
Wide-range analog capability including audio
Single-antenna-ready (No TX/RX switch required)
Differential LO dramatically reduces unintended radiation
Output power can be programmed with an external resistor
Good sensitivity (-94dBm typical at 10
-5
BER)
SAW filter on front end for superior out-of-band rejection
Received signal strength indication
Fast start-up and turnaround time
Wide input voltage range (2.7 to 13 VDC)
Very low power consumption (as low as 12 mA)
Power-down mode – 50µA max (V
CC
@ 5V)
Physical Dimensions
A P P L I C AT I O N S
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Small Area Networks
Wireless RS:232/485 Modems
2-Way Paging
Remote Control W/ Confirmation
Telemetry
Data Collection
Home/Industrial Automation
Long-Range RFID
Robotics
Wire Elimination
ORDERING INFORMATION
PART #
TR-XXX-SC-PA
XXX=916MHz
DESCRIPTION
SC-PA Transceiver
Revised 10/31/01
Page 1
PERFORMANCE DATA TR-XXX-SC-PA
*ABOUT THESE MEASUREMENTS
The performance parameters listed below are based on module operation at 25°C
from a 5VDC supply unless otherwise noted.
TRANSMIT SECTION
Parameter
Center Frequency
Fc Tolerance
Output Power
Output-Power Control Range
Harmonic Emissions
Spurious Emissions
Frequency Deviation
Data Rate
Audio Modulation Bandwidth
Modulation Voltage
Digital (Mark)
Digital (Space)
Analog
RECEIVE SECTION
LO Frequency
Flo Tolerance
Local Oscillator Feedthru
Spurious Emissions
Receive Sensitivity
Data Rate
Required Transition Interval
Audio Bandwidth
Audio Level
RSSI DC Output Range
RSSI Gain
RSSI Dynamic Range
ANTENNA PORT
Designed for match
TIMING
Power-on to Valid Receive
Power-on to Valid Transmit
RX to Valid TX Switching
TX to Valid RX Switching
POWER SUPPLY
Operating Voltage
Current Consumption
TX Mode
RX Mode
Sleep Mode
ENVIRONMENTAL
Operational Temp.
*Table applies to S/N >1000
Page 2
Designation
Fc
Min
-50
Typ
SEE TABLE 1
Max
+50
Units
MHz
KHz
dBm
dB
dBm
Notes
1
2,3
2,4,8
Po
Ph
- 12
-10
5
-45
-6
compatible with FCC part 15
90
300
.15
3
0
0
Flo
-50
-65
compatible with FCC part 15
-90
300
.15
180
.7 to 2.5
Grssi
27
65
50
6
3
3
4
VCC (pin 10)
Icc
12
10
15
13
50
0
70
19
15
mA
mA
uA
°C
8
2.7
8
5
5
6
13
-94
-100
33,600
3.5
17
dBm
Bps
ms
KHz
mVp-p
V
mV/dB
dB
ohms
ms
ms
ms
ms
VDC
6
8
8,14
7,8
8
8
8
8
8
8, 9,11
8, 9,11
8,9,12
8,9,13
SEE TABLE 1
+50
-50
5
0
3
110
130
33,600
17
5.2
KHz
Bps
KHz
VDC
VDC
Vp-p
MHz
KHz
dBm
2
10
5
8
7,8
9
NOTES:
1) Center frequency measured while modulated with a 0-5V square wave.
2) Into a 50-ohm load.
3) LVLADJ open.
4) Maximum power when LVLADJ open, minimum power when LVLADJ grounded.
5) TXDATA pin modulated with a 0-5V square wave.
6) For 10
-5
BER at 9,600 baud.
7) The audio bandwidth is wide to accommodate the needs of the data slicer. In audio applications, audio
quality may be improved by using a low pass filter rolling off at the maximum frequency of interest.
8) These parameters are only characterized and not tested.
9) The SC-PA is optimized for 0-5V modulation when sending digital data. 0-3V modulation is possible
but will slightly reduce system sensitivity and increase settling times.
10) Analog signals including audio should be AC-coupled. Signals in excess of 3V will cause distortion.
11) Time to transmitter or receiver readiness from the application of power to VIN or PDN going high.
12) Time from the TXEN going high and RXEN going low to the transmitter being ready to transmit data.
13) Time from the RXEN going high and TXEN going low to valid receiver data output.
14) Maximum time without a data transition.
MODEL
TR-916-SC-PA
Table 1
Center Frequency
TX
RX LO
916.48
905.78
UNITS
MHz
*CAUTION*
This product incorporates numerous static-sensitive components.
Always wear an ESD wrist strap and observe proper ESD handling
procedures when working with this device. Failure to observe this
precaution may result in module damage or failure.
TYPICAL PERFORMANCE GRAPHS
Data
Data
V
CC
RXEN
Figure 1: Power-on to valid RX data
Figure 2: Time to Valid Data TX
©RX
PLL Lock
TXEN
Figure 3: Transmitter Enabled to PLL Lock
Figure 4: Receive Bit Symmetry @33.6Kbps
Page 3
PIN DESCRIPTION
GND
RX DATA
AUDIO
RSSI
PDN
N/C
RXEN
TXEN
TXDATA
VIN
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND
GND
GND
GND
GND
GND
LVLADJ
Figure 5: SC-PA Pinouts (viewed looking down on top cover)
PIN#
1,11,13
15-20
2
Pin Title
Description
Module Grounds
Tie to Common Groundplane
Recovered Data Output
Ground
RXDATA
3
AUDIO
Recovered Analog Output
Received Signal
Strength Indicator
Logic Low Powers Down
The Transceiver
Not Implemented
Do Not Connect
Receiver Enable Pin
Active High
Pull Low When in TX
Transmitter Enable Pin
Active High
Pull Low When in RX
Analog or Digital Content
to be Transmitted
2.7-13VDC Supply
50Ω Antenna Port
TX/RX Switch Inside Module
Open for Maximum TX Power
Insert Resistor to Reduce by up to 5dB
*Do Not Pull High*
4
RSSI
5
PDN
6
N/C
7
RXEN
8
TXEN
9
TXDATA
10
VIN
12
ANT
14
Page 4
LVLADJ
RSSI
AUDIO
LNA
10.7MHz
Filter
10.7MHz
Filter
DEMOD
17KHz
Filter
DATA
IF
AMPLIFIER
See Table 1
TX
RF
DIFFERENTIAL
LO
(905.78MHz)
POWER
AMP
TRANSMIT
CRYSTAL
14.31818MHz
MODULATION IN
IF LIMITER
SAW Filter
IN
RECEIVE
CRYSTAL
14.152813MHz
DUAL TIMEBASE
PLL
LVLADJ
See Table 1
RX
Figure 6: SC-PA Block Diagram
DESCRIPTION
The TR-XXX-SC-PA module is a single-channel, half-duplex transceiver
designed for the wireless transmission of digital or analog information over
distances of <300 feet outside and <150 feet inside. The PA version has a lower
output power than the standard SC and has been pre-certified by the FCC which
greatly reduces the time to market and cost of product introduction. No external
components (excluding an antenna) are required. The module incorporates an
on-board switch allowing the use of a single antenna. Linx offers a wide selection
of antennas designed for use with the transceiver module.
The transceiver is half-duplex; therefore, it can only be operated in one mode at
a time: either transmit mode or receive mode. When transmitting, the receiver is
powered down. Likewise, the transmitter is powered down in receive mode.
The transmit section of the transceiver is capable of producing up to 1mW of
output power while maintaining harmonics and spurious emissions within legal
limits. The power amplifier can be adjusted over a 15dB adjustment range via
the LVLADJ pin. This is very useful for optimizing a product during FCC testing.
The transmitter directly modulates the carrier with the baseband signal present
at the TXDATA pin. If the signal is analog in nature, it will FM modulate the carrier.
If the signal is digital, the modulation method becomes FSK. In either case the
carrier’s peak deviation is determined by the modulating signal’s amplitude.
The receive section of the transceiver is capable of recovering a signal as low as
-94dBm (typical). The receiver operates in a single conversion superhet
configuration, with an IF of 10.7 MHz. A quadrature demodulator is used to
recover the baseband analog signal from the carrier. This analog signal is low-
pass filtered and then made externally available to the user via the audio pin. It
is also passed to the data slicer for squaring of digital content.
The transceiver has an on-board voltage regulator that regulates the internal
VCC to 3.0V. This allows a wide operating voltage range of 2.7V to 13V. At 2.7V,
the internal regulator acts as a saturated switch, directly passing voltage through
to the internal electronics. The PDN pin can be used to put the transceiver into
a low-current sleep mode (<50uA).
Page 5
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