Rating

Value

Units

Power Supply and All Input/Output Pins

-0.3 to +4.0

Non-Operating Case Temperature

-50 to +100

Soldering Temperature (10 seconds)

250

Characteristic

Sym

Notes

Minimum

Typical

Maximum

Units

Operating Frequency

314.80

315.20

MHz

Modulation Types

OOK & ASK

OOK Data Rate

kbps

ASK Data Rate

115.2

kbps

Transmitter Performance

Peak RF Output Power, 250 µA TXMOD Current

1.5

dBm

Peak Current, 250 µA TXMOD Current

9.5

OOK Turn On/Turn Off Times

OFF

20/15

µs

ASK Output Rise/Fall Times

1.1/1.1

µs

- 4

Harmonic Outputs

-50

dBm

- 10

Harmonic Outputs

-55

dBm

Non-harmonic Spurious Outputs

-50

dBm

Sleep Mode Current

0.7

µA

Sleep to Transmit Switch Time

TOR

µs

Transmit to Sleep Switch Time

RTO

µs

Control Input Logic Low Level

200

Control Input Logic High Level

Vcc - 300

Power Supply Voltage Range

2.2

3.7

Vdc

Operating Ambient Temperature

-40

+85

Electrical Characteristics

Absolute Maximum Ratings

· 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

TX5001

315.00 MHz

Hybrid

Transmitter

The TX5001 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 TX5001 includes provisions for both on-off keyed (OOK) and amplitude-shift

keyed (ASK) modulation. The TX5001 employs SAW filtering to suppress output har-

monics, facilitating compliance with FCC Part 15 and similar regulations.

Item

Symbol

OOK

ASK

Units

Notes

Nominal NRZ Data Rate

NOM

2.4

19.2

115.2

kbps

see page 1

Minimum Signal Pulse

MIN

416.67

52.08

8.68

µs

single bit

Maximum Signal Pulse

MAX

1666.68

208.32

34.72

µs

4 bits of

same value

TXMOD Resistor

TXM

8.2

±5%, for 1.5 dBm output

DC Bypass Capacitor

DCB

4.7

µF

tantalum

RF Bypass Capacitor 1

RFB1

±5% NPO

RF Bypass Capacitor 2

RFB2

100

±5% NPO

RF Bypass Bead

RFB

Fair-Rite

vendor

2506033017YO or equivalent

Series Tuning Inductor

50 ohm antenna

Shunt Tuning/ESD Inductor

ESD

50 ohm antenna

M o d u l a t i o n I n p u t

T O P V I E W

G N D

C N T

R L 0

C N T

R L 1

W I D T H

R A T E

T H L D

R R E F

G N D 2

T X

M O D

R X

D A T A

L P F

A D J

C M P

I N

B B

O U T

P K

D E T

A G C

C A P

V C C

R F I O

G N D 1

+ 3

V D C

T r a n s m i t t e r O O K C o n f i g u r a t i o n

2 0

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 9

+ 3

V D C

T X M

R F B 2

D C B

A T

E S D

R F B 1

R F B

T / S

M o d u l a t i o n I n p u t

T O P V I E W

G N D

C N T

R L 0

C N T

R L 1

W I D T H

R A T E

T H L D

R R E F

G N D 2

T X

M O D

R X

D A T A

L P F

A D J

C M P

I N

B B

O U T

P K

D E T

A G C

C A P

V C C

R F I O

G N D 1

+ 3

V D C

T r a n s m i t t e r A S K C o n f i g u r a t i o n

2 0

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 9

+ 3

V D C

T X M

R F B 2

D C B

A T

E S D

R F B 1

R F B

T / S

Transmitter Set-Up, 3.0 Vdc, -40 to +85

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.

CAUTION: Electrostatic Sensitive Device. Observe precautions when handling.

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 i t t e r B l o c k D i a g r a m

T X A 1

T X A 2

A n t e n n a

S A W

C o u p l e d

R e s o n a t o r

S A W

C R

F i l t e r

M o d u l a t i o n

& B i a s C o n t r o l

T X

I N

C N

T R L 1

C N

T R L 0

T u n e / E S D

A n t

T u n e

T X M

Figure 1

The transmitter RF output power is proportional to the input current

to the TXMOD pin. A series resistor is used to adjust the peak trans-

mitter output power. 0 dBm of output power requires about 250 µA

of input current.
Transmitter Mode Control
The three transmitter operating modes transmit ASK, transmit

OOK, and power-down (sleep), are controlled by the Modulation &

Bias Control function, and are selected with the CNTRL1 and

CNTRL0 control pins. Setting CNTRL1 high and CNTRL0 low place

the unit in the ASK transmit mode. Setting CNTRL1 low and

CNTRL0 high place the unit in the OOK transmit mode. Setting

CNTRL1 and CNTRL0 both low place the unit in the power-down

mode. (Note that the resistor driving TXMOD must also be low in the

power-down mode to minimize power-down current.) CNTRL1 and

CNTRL0 are CMOS compatible inputs. These inputs must be held

at a logic level; they cannot be left unconnected.

Turn-On Timing
The maximum time required for either the OOK or ASK transmitter

mode to become operational is 5 ms after the supply voltage

reaches 2.2 Vdc. The total turn-on time to stable transmitter opera-

tion for a 10 ms power supply rise time is 15 ms.
Sleep and Wake-Up Timing
The maximum transition time from either transmit mode to the sleep

mode (t

TOS

and t

TAS

) is 15 µs after CNTRL1 and CNTRL0 are both

low (1 µs fall time).
The maximum time required to switch from the sleep mode to either

transmit mode (t

STO

and t

STA

) is 21 µs. Most of this time is due to the

start-up of the transmitter oscillator.

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 9

T r a n s m i t t e r P i n O u t

R F I O

1 0

2 0

1 8

N C

T X M O D

N C

G N D 1

V C C 1

G N D 2

V C C 2

G N D 3

C N T R L 0

C N T R L 1

0 . 0 0 0

000

.14

7
0

. 0 7 7 5

. 1 0 2 5

. 1 1 7 5

. 1 5 7 5

. 1 9 7 5

. 2 3 7 5

. 2 7 7 5

. 3 1 7 5

. 3 5 7 5

. 3 8 2 5

. 4 6 0 0

.19

7
5

.17

2
5

3
7
5

D i m e n s i o n s i n i n c h e s

S M - 2 0 L P C B P a d L a y o u t

S M - 2 0 L P a c k a g e D r a w i n g

0 . 0 8 "

( 2 . 0 3 )

0 . 1 2 5 "

( 3 . 2 0 )

0 . 0 2 "

( 0 . 5 1 )

0 . 0 4 "

( 1 . 0 2 )

0 . 1 3 "

( 3 . 3 0 )

0 . 4 3 "

( 1 0 . 9 )

0 . 3 8 "

( 9 . 6 5 )

0 . 0 7 5 "

( 1 . 9 0 )

Pin

Name

Description

GND1

GND1 is the RF ground pin. GND2 and GND3 should be connected to GND1 by short, low-inductance traces.

VCC1

VCC1 is the positive supply voltage pin for the transmitter output amplifier and the transmitter base-band circuitry.

VCC1 is usually connected to the positive supply through a ferrite RF decoupling bead which is bypassed by an

RF capacitor on the supply side. See the description of VCC2 (Pin 16) for additional information.

No connection. Printed circuit board pad may be grounded or floating.

TXMOD

The transmitter RF output voltage is proportional to the input current to this pin. A series resistor is used to adjust

the peak transmitter output voltage. 1.5 dBm of output power requires 250 µA of input current. In the ASK mode,

minimum output power occurs when the modulation driver sinks about 10 µA of current from this pin. In the OOK

mode, input signals less than 220 mV completely turn the transmitter oscillator off. Internally, this pin appears to

be a diode in series with a small resistor. Peak transmitter output power P

for a 3 Vdc supply voltage is approxi-

mately:

= 24*(I

TXM

)

, where P

is in mW, and the peak modulation current I

TXM

is in mA

A ±5% resistor value is recommended. In the OOK mode, this pin is usually driven with a logic-level data input

(unshaped data pulses). OOK modulation is practical for data pulses of 200 µs or longer. In the ASK mode, this

pin accepts analog modulation (shaped or unshaped data pulses). ASK modulation is practical for data pulses

8.7 µs or longer. This pin must be low in the power-down (sleep) mode. Please refer to the ASH Transceiver De-

signer's Guide for additional information on modulation techniques.

No connection. Printed circuit board pad may be grounded or floating.

GND2

GND2 is an IC ground pin. It should be connected to GND1 by a short, low inductance trace.

No connection. Printed circuit board pad may be grounded or floating.

VCC2

VCC2 is the positive supply voltage pin for the transmitter oscillator. Pin 16 must be bypassed with an RF capaci-

tor, and must also be bypassed with a 1 to 10 µF tantalum or electrolytic capacitor. Power supply voltage ripple

should be limited to 10 mV peak-to-peak. See the ASH Transceiver Designer's Guide for additional information.

CNTRL1

CNTRL1 and CNTRL0 select the transmit modes. CNTRL1 high and CNTRL0 low place the unit in the ASK trans-

mit mode. CNTRL1 low and CNTRL0 high place the unit in the OOK transmit mode. CNTRL1 and CNTRL0 both

low place the unit in the power-down (sleep) mode. CNTRL1 is a high-impedance input (CMOS compatible). An

input voltage of 0 to 300 mV is interpreted as a logic low. An input voltage of Vcc - 300 mV or greater is inter-

preted as a logic high. An input voltage greater than Vcc + 200 mV should not be applied to this pin. A logic high

requires a maximum source current of 40 µA. A logic low requires a maximum sink current of 25 µA (1 µA in sleep

mode). This pin must be held at a logic level; it cannot be left unconnected.

CNTRL0

CNTRL0 is used with CNTRL1 to control the operating modes of the transmitter. See the description of CNTRL1

for more information.

GND3

GND3 is an IC ground pin. It should be connected to GND1 by a short, low inductance trace.

RFIO

RFIO is the transmitter RF output pin. This pin is connected directly to the SAW filter transducer. Antennas pre-

senting an impedance in the range of 35 to 72 ohms resistive can be satisfactorily matched to this pin with a se-

ries 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.

Pin Descriptions

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