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©2008 by RF Monolithics, Inc.

DR4100 - 4/8/08

Pin Desciptions

Pin

Name

Description

1VCC

5TX IN

The TX IN pin is connected to the transmitter TXMOD pin through a 4.7 K resistor on the circuit board. Additional series resis-

tance will often be required between the modulation source and the TX IN pin, depending on the desired output power and

peak modulation voltage (3.3 K typical for a peak modulation voltage of 3 volts). Saturated output power requires about 450 µA

This pin must be held low in the receive and sleep modes. Please refer to section 2.9 of the ASH Transceiver Designer's Guide

for additional information.

6, 7

GND

8NC

9VCC

This is the positive supply voltage pin for the module. The operating voltage range is 2.7 to 3.5 Vdc. It is also possible to use

Pin 1 as the Vcc input. Please refer to the Pin 1 description above.

10

GND

This is the supply voltage return pin.

11

CTR1

CTR1 and CTR0 select the transmit modes. CTR1 high and CTR0 low place the unit in the ASK transmit mode. CTR1 low and

CTR0 high place the unit in the OOK transmit mode. CTR1 and CTR0 both low place the unit in the power down (sleep) mode.

CTR1 is a high-impedance input (CMOS compatible). An input voltage of 0 to 200 mV is interpreted as a logic low. An input

voltage of Vcc - 200 mV or greater is interpreted as a logic high. An input voltage greater than Vcc + 200 mV should not be

applied to this pin. This pin must be held at a logic level; it cannot be left unconnected.

12

CTR0

(T/S)

“T” =1 for transmission, “S” =0 for sleep mode

13

RFIO

RFIO is the RF output pin. A matching circuit for a 50 ohm load (antenna) is implemented on the circuit board between this pin

and the transceiver SAW filter transducer.

14

RF GND

This pin is the RF ground (return) to be used in conjunction with the RFIO pin. For example, when connecting the module to an

external antenna, the coaxial cable ground is connected this pin and the coaxial cable center conductor is connected to RFIO.

Da t a I n

3 V d c

A ppl i c a t i on O O K C i r c ui t

1

2

345

8

9

10

11

12

13

14

D R 4000

T/ S

7

6

3. 3 k

DR4100

Application OOK Circuit

D a ta In

3 V d c

Ap p li c a t i o n AS K C i r c u i t

D R 40 00

T/ S

12

3

4

5

8

9

10

11

12

13

14

7

6

3.3 k

Application ASK Circuit

DR4100