TR3003 RFM, TR3003 Datasheet - Page 11

• Manufacturer Part Number: TR3003
• Description: RF Receiver 2G ASH Transceiver 303.825MHz 115.2kbps
• Manufacturer: RFM
• Type: Transceiverr

Specifications of TR3003

• Package / Case: SM-20L
• Operating Frequency: 304.025 MHz
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Pin
15
16
17
18
19
20
PWIDTH
CNTRL1
CNTRL0
E-mail: [e-mail]
Name
GND3
VCC2
RFIO
The PWIDTH pin sets the width of the ON pulse to the first RF amplifier t
width to the second RF amplifier t
can be adjusted between 0.55 and 1 µs with a resistor value in the range of 200 K to 390 K. The value of R
A ±5% resistor value is recommended. When this pin is connected to Vcc through a 1 M resistor, the RF amplifiers operate at
a nominal 50%-50% duty cycle, facilitating high data rate operation. In this case, the RF amplifier ON times are controlled by
the PRATE resistor as described above. It is important to keep the total capacitance between ground, Vcc and this node to
less than 5 pF to maintain stability. When using the high data rate operation with the sleep mode, connect the 1 M resistor
between this pin and CNTRL1 (Pin 17), so this pin is low in the sleep mode.
VCC2 is the positive supply voltage pin for the receiver RF section and transmitter oscillator. Pin 16 must be bypassed with
an RF capacitor, and must also be bypassed with a 1 to 10 µF tantalum or electrolytic capacitor. See the ASH Transceiver
Designer’s Guide for additional information.
CNTRL1 and CNTRL0 select the receive and transmit modes. CNTRL1 and CNTRL0 both high place the unit in the receive
mode. 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 300 mV is interpreted as a logic low. An input voltage of
Vcc - 300 mV or greater is interpreted as a logic high. An input voltage greater than Vcc + 200 mV should not be applied to
this pin. A logic high requires a maximum source current of 40 µA. A logic low requires a maximum sink current of 25 µA (1
µA in sleep mode). This pin must be held at a logic level; it cannot be left unconnected.
CNTRL0 is used with CNTRL1 to control the receive and transmit modes of the transceiver. CNTRL0 is a high-impedance
input (CMOS compatible). An input voltage of 0 to 300 mV is interpreted as a logic low. An input voltage of Vcc - 300 mV or
greater is interpreted as a logic high. An input voltage greater than Vcc + 200 mV should not be applied to this pin. A logic
high requires a maximum source current of 40 µA. A logic low requires a maximum sink current of 25 µA (1 µA in sleep
mode). This pin must be held at a logic level; it cannot be left unconnected.
GND3 is an IC ground pin. It should be connected to GND1 by a short, low inductance trace.
RFIO is the RF input/output pin. This pin is connected directly to the SAW filter transducer. Antennas presenting an imped-
ance in the range of 35 to 72 ohms resistive can be satisfactorily matched to this pin with a series matching coil and a shunt
matching/ESD protection coil. Other antenna impedances can be matched using two or three components. For some imped-
ances, two inductors and a capacitor will be required. A DC path from RFIO to ground is required for ESD protection.
R
PW
= 404* t
PW1
- 18.6, where t
PW2
SM-20L PCB Pad Layout
is set at 1.1 times the pulse width to the first RF amplifier). The ON pulse width t
0.000
.4600
PW1
Dimensions in inches
is in µs and R
Description
PW
is in kilohms
PW1
.3825
.3575
.3175
.2775
.2375
.1975
.1575
.1175
.1025
.0775
with a resistor R
PW
to ground (the ON pulse
PW
is given by:
TR3003 - 4/4/08
Page 11 of 12
PW1