Preliminary
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 E-mail: info@rfm.com Page 1 of 2
RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. DR4000-041000
Electrical Characteristics, 2.4 kbps On-Off Keyed
Characteristic Sym Notes Minimum Typical Maximum Units
Operating Frequency (±200 kHz) fO916.5 MHz
Data Rate OOK 19.2 kbps
ASK 115.2
Transmitter Performance (OOK @ 2.4 kbps)
Peak Input Current, 3 Vdc Supply ITP 12 mA
Peak Output Power PO0.75 mW
Turn On/Turn Off Time tON/tOFF 12/6 µs
Power Supply Voltage Range VCC 2.7 3.5 Vdc
Operating Ambient Temperature TA-20 +65 °C
•Designed for Short-Range Wireless Data Communications
•Supports up to 115.2 kbps Encoded Data Transmissions
•3 V, Low Current Operation plus Sleep Mode
•Ready to Use OEM Module
The DR4000 transmitter module is ideal for short-range wireless data applications where robust operation,
small size and low power consumption are required. The DR4000 utilizes RFM’s TX6000 amplifier-
sequenced hybrid (ASH) architecture to achieve this unique blend of characteristics. The transmitter includes
provisions for on-off keyed (OOK) and ASK modulation. The transmitter employs SAW filtering to suppress
output harmonics, facilitating compliance with FCC 15.249 and similar regulations. The DR4000 includes the
TX6000 plus all configuration components in a ready-to-use PCB assembly, excellent for prototyping and
intermediate volume production runs.
Absolute Maximum Ratings
Rating Value Units
Power Supply and All Input/Output Pins -0.3 to +4.0 V
Non-Operating Case Temperature -50 to +100 °C
Soldering Temperature (10 seconds) 230 °C
916.50 MHz
Transmitter
Module
DR4000
.70
.25 .20
.165
.70
.10
DR4000 Outline Drawing
Dimensions in inches
DR4000 Pin Out
RF
GNDRFIO
VCC
NC
TX IN
NC
NC
CTR0
CTR1
GND
VCC
NC
1
2
3
4
5 6
7
8
9
10
1112
916.50 MHz Transmitter Module
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 E-mail: info@rfm.com Page 2 of 2
RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. DR4000-041000
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
resistance 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 of drive current. Peak output power PO for a 3 Vdc supply is approximately:
PO = 4.8*((VTXH - 0.9)/(RM + 4.7))2, where PO is in mW, peak modulation voltage VTXH is in volts and external modulation
resistor RM is in kilohms
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.
7VCC 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.
8GND This is the supply voltage return pin.
9CNTRL1
CNTRL1 and CNTRL0 select the transmit modes. CNTRL1 high and CNTRL0 low place the unit in the ASK transmit 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 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.
10 CNTRL0 CNTRL0 is used with CNTRL1 to control the operating modes of the transmitter. See the description of CNTRL1 for more
information.
11 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.
12 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.
Data In
3 Vdc
Application OOK Circuit
1 2 3 4 5
678910
11
12
DR4000
T/S
DR4000
Application OOK Circuit
Data In
3 Vdc
Application ASK Circuit
1 2 3 4 5
678910
11
12
DR4000
T/S
Application ASK Circuit
DR4000
