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DR4001 (R) 3/31/15 Page 2 of 2
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Pin Desciptions
Pin Name Description
1VCC
5 TX 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
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.
6, 7 GND
8NC
9 VCC 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.
Data In
Application OOK Circuit
12345
89101112
13
14
DR4000
T/S
7
6
3.3k
DR4001
Application OOK Circuit
Data In
pplication ASK Circuit
DR4000
T/S
12345
89101112
13
14
7
6
3.3k
Application ASK Circuit
DR4001
