DR4100 Datasheet, PDF (2/2 Pages) RF Monolithics, Inc – 433.92 MHz Transmitter Module

Pin Desciptions
Pin
Name
1
VCC
5
TX IN
6, 7
GND
8
NC
9
VCC
10
GND
11
CTR1
12
CTR0
(T/S)
13
RFIO
14
RF GND
Description
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
of drive current. Peak output power P_O for a 3 Vdc supply is approximately:
P_O = 4.8*((V_TXH - 0.9)/(R_M + 4.7))², where P_O is in mW, peak modulation voltage V_TXH is in volts and external modulation resis-
tor R_M 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.
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.
This is the supply voltage return pin.
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.
“T” =1 for transmission, “S” =0 for sleep mode
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.
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.
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T /S
3 Vdc
12 11 10 9
13
D_DRR₄4₁0₀0₀ 0
14
1234
8
7
6
5
3 .3k
D a ta In
www.RFM.com E-mail: [e-mail]
©2008 by RF Monolithics, Inc.
A ^Ap^pp^pl^li^icc^aa^tit^oiⁿo^An^SKA ^CS^irK^cuC^it i r c u i t
T /S
3 Vdc
12 11 10 9
13
D_DR_R44₁0₀0₀0
14
1234
8
7
6
5
3 .3 k
D a ta In
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DR4100 - 4/8/08