©2010-2015 by Murata Electronics N.A., Inc.

TX5000 (R) 4/24/15

Page 4 of 6

www.murata.com

The transmitter RF output power is proportional to the input current

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

transmitter 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

operation 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

are both low (1 µs fall time).

The maximum time required to switch from the sleep mode to

due to the start-up of the transmitter oscillator.

0.000

.0775

.1025

.1175

.1575

.1975

.2375

.2775

.3175

.3575

.3825

.4600

Dimensions in inches

SM-20L PCB Pad Layout

Dimension

mm

Inches

Min

Nom

Max

Min

Nom

Max

A

10.795

10.922

11.04

9

.425

.430

.435

B

9.525

9.652

9.779

.375

.380

.385

C

1.778

1.905

2.032

.070

.075

.080

D

3.048

3.175

3.302

.120

.125

.130

E

0.381

0.508

0.635

.015

.020

.025

F

0.889

1.016

1.143

.035

.040

.045

G

3.175

3.302

3.429

.125

.130

.135

H

1.778

1.905

2.032

.070

.075

0.80

SM-20L Package Drawing

CD

E

F

G

A

B

H

3

4

5

6

7

9

11

12

13

14

15

16

17

19

Transmitter Pin Out

RFIO

8

2

10

20

1

18

NC

NC

NC

NC

NC

NC

NC

NC

TXMOD

NC

NC

NC

GND1

VCC1

GND2

VCC2

GND3

CNTRL0

CNTRL1