Hybrid Transmitter. TX5002 Datasheet

TX5002 Transmitter. Datasheet pdf. Equivalent


RF Monolithics TX5002
( DataSheet : www.DataSheet4U.com )
®
· Designed for Short-Range Wireless Data Communications
· Supports RF Data Transmission Rates Up to 115.2 kbps
· 3 V, Low Current Operation plus Sleep Mode
· Stable, Easy to Use, Low External Parts Count
The TX5002 hybrid transmitter is ideal for short-range wireless data applications
where robust operation, small size, low power consumption and low cost are required.
All critical RF functions are contained in the hybrid, simplifying and speeding design-
in. The TX5002 includes provisions for both on-off keyed (OOK) and amplitude-shift
keyed (ASK) modulation. The TX5002 employs SAW filtering to suppress output har-
monics, facilitating compliance with FCC Part 15 and similar regulations.
TX5002
418.00 MHz
Hybrid
Transmitter
Absolute Maximum Ratings
Rating
Power Supply and All Input/Output Pins
Non-Operating Case Temperature
Soldering Temperature (10 seconds)
Electrical Characteristics
Characteristic
Operating Frequency
Modulation Types
OOK Data Rate
ASK Data Rate
Transmitter Performance
Peak RF Output Power, 250 µA TXMOD Current
Peak Current, 250 µA TXMOD Current
OOK Turn On/Turn Off Times
ASK Output Rise/Fall Times
2nd - 4th Harmonic Outputs
5th - 10th Harmonic Outputs
Non-harmonic Spurious Outputs
Sleep Mode Current
Sleep to Transmit Switch Time
Transmit to Sleep Switch Time
Control Input Logic Low Level
Control Input Logic High Level
Power Supply Voltage Range
Operating Ambient Temperature
Value
-0.3 to +4.0
-50 to +100
250
Units
V
oC
oC
Sym
fO
Notes
Minimum Typical Maximum
417.80
418.20
OOK & ASK
10
115.2
Units
MHz
kbps
kbps
PO
ITP
tON/tOFF
tTR/tTF
0
7.5
IS
tTOR
tRTO
0.7
1 Vcc - 300
VCC 2.2
TA -40
20/15
1.1/1.1
-50
-55
-50
21
15
200
3.7
+85
dBm
mA
µs
µs
dBm
dBm
dBm
µA
µs
µs
mV
mV
Vdc
oC
1
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TX5002 Datasheet
Recommendation TX5002 Datasheet
Part TX5002
Description 418.00 MHz Hybrid Transmitter
Feature TX5002; ( DataSheet : www.DataSheet4U.com ) ® · Designed for Short-Range Wireless Data Communications · Su.
Manufacture RF Monolithics
Datasheet
Download TX5002 Datasheet




RF Monolithics TX5002
T r a n s m itte r O O K C o n fig u r a tio n
+3
C RFB2 V D C
C DCB
+
L AT
L ESD
T /S
19 18 17 16 15 14 13 12
G ND CNT CNT VCC
P
P TH LD TH LD
3 R L 0 R L 1 2 W ID T H R A T E 1
2
R F IO
20
T O P V IE W
R R E F 11
GND1
1 VCC
AG C
PK
BB CM P RX
G N D 2 10
TX LP F
1
CAP DET O UT
IN D A T A M O D A D J
23456789
L RFB
+3
VDC
C R FB1
R TXM
M o d u la tio n In p u t
T r a n s m itte r A S K C o n fig u r a tio n
+3
C RFB2 V D C
C DCB
+
L AT
L ESD
T /S
19 18 17 16 15 14 13 12
G ND CNT CNT VCC
P
P TH LD TH LD
3 R L 0 R L 1 2 W ID T H R A T E 1
2
R F IO
20
T O P V IE W
R R E F 11
GND1
1 VCC
AG C
PK
BB CM P RX
G N D 2 10
TX LP F
1 C A P D E T O U T IN D A T A M O D A D J
23456789
L RFB
+3
VDC
C R FB1
R TXM
M o d u la tio n In p u t
Transmitter Set-Up, 3.0 Vdc, -40 to +85 0C
Item
Nominal NRZ Data Rate
Minimum Signal Pulse
Maximum Signal Pulse
TXMOD Resistor
DC Bypass Capacitor
RF Bypass Capacitor 1
RF Bypass Capacitor 2
RF Bypass Bead
Series Tuning Inductor
Shunt Tuning/ESD Inductor
Symbol
DRNOM
SPMIN
SPMAX
RTXM
CDCB
CRFB1
CRFB2
LRFB
LAT
LESD
OOK
2.4
416.67
1666.68
8.2
4.7
27
100
Fair-Rite
56
220
ASK
19.2
52.08
208.32
8.2
4.7
27
100
Fair-Rite
56
220
ASK
115.2
8.68
34.72
8.2
4.7
27
100
Fair-Rite
56
220
Units
kbps
µs
µs
K
µF
pF
pF
vendor
nH
nH
Notes
see page 1
single bit
4 bits of same value
±5%, for 0 dBm output
tantalum
±5% NPO
±5% NPO
2506033017YO or equivalent
50 ohm antenna
50 ohm antenna
CAUTION: Electrostatic Sensitive Device. Observe precautions when handling.
Notes:
1. Do not allow the voltage applied to a control input pin to exceed Vcc + 200 mV.
2. The companion receiver to the TX6000 is the RX6000. Please see RFM’s web site at www.rfm.com for details.
2



RF Monolithics TX5002
Transmitter Theory of Operation
Introduction
RFM’s TX-series hybrid transmitters are specifically designed for
short-range wireless data communication applications. These trans-
mitters provide robust operation, very small size, low power con-
sumption and low implementation cost. All critical RF functions are
contained in the hybrid, simplifying and speeding design-in. The
transmitters can be readily configured to support a wide range of
data rates and protocol requirements. TX-series transmitters feature
excellent suppression of output harmonics and virtually no other RF
emissions, making them easy to certify to short- range (unlicensed)
radio regulations.
Transmitter Block Diagram
Figure 1 is the general block diagram of the transmitter. Please refer
to Figure 1 for the following discussions.
Antenna Port
The only external RF components needed for the transmitter are the
antenna and its matching components. Antennas presenting an im-
pedance in the range of 35 to 72 ohms resistive can be satisfactorily
matched to the RFIO pin with a series matching coil and a shunt
matching/ESD protection coil. Other antenna impedances can be
matched using two or three components. For some impedances,
two inductors and a capacitor will be required. A DC path from RFIO
to ground is required for ESD protection.
Transmitter Chain
The transmitter chain consists of a SAW coupled-resonator oscilla-
tor followed by a modulated buffer amplifier. The SAW coupled res-
onator output filter suppresses transmitter harmonics to the
antenna.
Transmitter operation supports two modulation formats, on-off
keyed (OOK) modulation, and amplitude-shift keyed (ASK) modula-
tion. When OOK modulation is chosen, the transmitter output turns
completely off between “1” data pulses. When ASK modulation is
chosen, a “1” pulse is represented by a higher transmitted power
level, and a “0” is represented by a lower transmitted power level.
OOK modulation provides compatibility with first-generation ASH
technology, and provides for power conservation. ASK modulation
must be used for high data rates (data pulses less than 200 µs).
ASK modulation also reduces the effects of some types of interfer-
ence and allows the transmitted pulses to be shaped to control mod-
ulation bandwidth.
The modulation format is chosen by the state of the CNTRL0 and
the CNTRL1 mode control pins, as discussed below. In the OOK
mode, the oscillator amplifier TXA1 and buffer amplifier TXA2 are
turned off when the voltage to the TXMOD input falls below 220 mV.
In the OOK mode, the data rate is limited by the 20/15 µs turn-on
and turn-off time of the oscillator. In the ASK mode TXA1 is biased
ON continuously, and the output of TXA2 is modulated by the
TXMOD input current. Minimum output power occurs in the ASK
mode when the modulation driver sinks about 10 µA of current from
the TXMOD pin.
T r a n s m itte r B lo c k D ia g r a m
SAW
C o u p le d
R e s o n a to r
TXA1
TXA2
A n te n n a
SAW
CR
F ilte r
A nt
Tune
T u n e /E S D
M o d u la tio n
& B ia s C o n tr o l
R TXM
TX C N C N
IN T R L 1 T R L 0
Figure 1
3







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