RFM DR3000-1

DR3000-1
®
•
•
•
•
Designed for Short-Range Wireless Data Communications
Supports 115.2 kbps Encoded Data Transmissions
3 V, Low Current Operation plus Sleep Mode
Ready to Use OEM Module
The DR3000-1 transceiver module is ideal for short-range wireless data applications where robust operation,
small size and low power consumption are required. The DR3000-1 utilizes RFM’s TR1000 amplifiersequenced hybrid (ASH) architecture to achieve this unique blend of characteristics. The receiver section of
the TR1000 is sensitive and stable. A wide dynamic range log detector provides robust performance in the
presence of on-channel interference or noise. Two stages of SAW filtering provide excellent receiver out-ofband rejection. The transmitter includes provisions for both on-off keyed (OOK) and amplitude-shift keyed
(ASK) modulation. The transmitter employs SAW filtering to suppress output harmonics, facilitating compliance with FCC 15.249 and similar regulations. The DR3000-1 includes the TR1000 plus most configuration
components in a ready-to-use PCB assembly, excellent for prototyping and intermediate volume production
runs.
916.50 MHz
Transceiver
Module
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
230
°C
Soldering Temperature (10 seconds)
Electrical Characteristics, 115.2 kbps Amplitude-Shift Keyed
Characteristic
Operating Frequency
Sym
fO
Notes
Minimum
916.30
Typical
Modulation Type
Maximum
916.70
Units
MHz
ASK
Data Rate
115.2
Mbps
Receiver Performance (ASK @ 115.2 kbps)
Input Current, 3 Vdc Supply
Input Signal for 10-4 BER, 25 °C
Rejection, ±30 MHz
IR
4.8
-85
RREJ
mA
dBm
55
dB
Transmitter Performance (ASK @ 115.2 kbps)
Peak Input Current, 3 Vdc Supply
ITP
Peak Output Power
PO
Turn On/Turn Off Time
Sleep to Receive Switch Time (15 ms sleep, -76 dBm signal)
Sleep Mode Current
12
0.75
tON/tOFF
mA
mW
1.1/1.1
µs
tSR
20
µs
µA
IS
0.75
Transmit to Receive Switch Time (15 ms transmit, -76 dBm signal)
tTOR
20
Receive to Transmit Switch Time
tRTO
Power Supply Voltage Range
Vcc
Operating Ambient Temperature
TA
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
µs
12
µs
2.7
3.5
Vdc
-40
+85
°C
E-mail: [email protected]
http://www.rfm.com
DR3000-1-060304
Page 1 of 5
916.50 MHz
Transceiver Module
DR3000-1 Schematic
RFIO
(13)
RF GND
(14)
C1
CTR0 (12)
C6
CTR1 (11)
VCC (9)
+
C4
R1
R2
R3
C5
R8
20
11
L1
ASH Transceiver
L2
R4
1
10
LPF ADJ (8)
C3
L3
R5
R6
GND (6, 7, 10)
RX BBO
(3)
AGC/VCC
(1)
PK DET
(2)
TX IN
(5)
RX DATA
(4)
DR3000-1 Pin Out
RF
GND
RFIO
14
13
DR3000-1 Outline Drawing
.25
AGC/VCC
1
12
CTR0
PK DET
2
11
CTR1
RX BBO
3
10
GND
RX DATA
4
9
VCC
TX IN
5
8
LPF ADJ
6
7
GND
GND
.70
.20
.165
.10
.70
Dimensions in inches
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: [email protected]
http://www.rfm.com
DR3000-1-060304
Page 2 of 5
916.50 MHz
Transceiver Module
Pin Descriptions
Pin
Name
Description
This pin is connected directly to the transceiver AGCCAP pin, which controls the AGC reset operation. To enable AGC operation (required for ASK transmission) an external capacitor is placed between this pin and ground. The capacitor sets the
minimum time the AGC will hold-in once it is engaged. The hold-in time is set to avoid AGC chattering. For a given hold-in
time tAGH, the capacitor value CAGC is:
CAGC = 19.1* tAGH, where tAGH is in µs and CAGC is in pF
1
2
3
4
AGC/VCC
For 115.2 kbps operation, a 2200 pF ±10% ceramic capacitor should be used at this pin. The value of CAGC given above provides a hold-in time between tAGH and 2.65* tAGH, depending on operating voltage, temperature, etc. The hold-in time is chosen to allow the AGC to ride through the longest run of zero bits that can occur in a received data stream. The AGC hold-in
time can be greater than the peak detector decay time, as discussed below. However, the AGC hold-in time should not be
set too long, or the receiver will be slow in returning to full sensitivity once the AGC is engaged by noise or interference. AGC
operation also depends on a functioning peak detector, as discussed below. The AGC capacitor is discharged in the transceiver power-down (sleep) mode and in the transmit modes.
PK DET
This pin is connected directly to the transceiver PKDET pin. This pin controls the peak detector operation. An external capacitor between this pin and ground sets the peak detector attack and decay times, which have a fixed 1:1000 ratio. For 115.2
kbps applications, the attack time constant should be set to 0.24 µs with a 0.001 µF capacitor to ground. (This adequately
matches the peak detector decay time constant of 240 µs to the time constant of the 0.0027 µF coupling capacitor C3.) A
±10% ceramic capacitor should be used at this pin. The peak detector is used to drive the “dB-below-peak” data slicer and
the AGC release function. The AGC hold-in time can be extended beyond the peak detector decay time with the AGC capacitor, as discussed above. The peak detector capacitor is discharged in the transceiver power-down (sleep) mode and in the
transmit modes. See the description of Pin 3 below for further information.
RX BBO
This pin is connected directly to the transceiver BBOUT pin. On the circuit board, BBOUT also drives the transceiver CMPIN
pin through C3, a 0.0027 µF coupling capacitor (tBBC = 173 µs). RX BBO can also be used to drive an external data recovery
process (DSP, etc.). The nominal output impedance of this pin is 1 K. The RX BBO signal changes about 10 mV/dB, with a
peak-to-peak signal level of up to 675 mV. The signal at RX BBO is riding on a 1.1 Vdc value that varies somewhat with supply voltage and temperature, so it should be coupled through a capacitor to an external load. A load impedance of 50 K to
500 K in parallel with no more than 10 pF is recommended. Note the AGC reset function is driven by the signal applied to
CMPIN through C3. When the transceiver is in power-down (sleep) or in a transmit mode, the output impedance of this pin
becomes very high, preserving the charge on the coupling capacitor(s). The value of C3 on the circuit board has been chosen to match typical data encoding schemes at 115.2 kbps. If C3 is modified to support different data rates and/or encoding
schemes, make the value of the peak detector capacitor about 1/3 the value of C3.
RX DATA
RX DATA is connected directly to the transceiver data output pin, RXDATA. This pin will drive a 10 pF, 500 K parallel load.
The peak current available from this pin increases with the receiver low-pass filter cutoff frequency. In the power-down
(sleep) or transmit modes, this pin becomes high impedance. If required, a 1000 K pull-up or pull-down resistor can be used
to establish a definite logic state when this pin is high impedance (do not connect the pull-up resistor to a supply voltage
higher than 3.5 Vdc or the transceiver will be damaged). This pin must be buffered to successfully drive low-impedance
loads.
The TX IN pin is connected to the transceiver 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:
5
TX IN
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.
6
GND
This is a ground pin.
7
GND
This is a ground pin.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: [email protected]
http://www.rfm.com
DR3000-1-060304
Page 3 of 5
916.50 MHz
Transceiver Module
This pin is the receiver low-pass filter bandwidth adjust, and is connected directly to the transceiver LPFADJ pin. R6 on the
circuit board (12 K) is connected between LPFADJ and ground, and sets the receiver bandwidth for typical 115.2 kbps operation. The filter bandwidth can be increased by adding an external resistor in parallel with R6. The equivalent resistor value
can range from 12 K to 820 ohms, providing a filter 3 dB bandwidth fLPF from 120 kHz to 1.8 MHz. The 3 dB filter bandwidth
is determined by:
8
LPF ADJ
fLPF = 1445/(12*RLPF/(12 + RLPF)), where RLPF is in kilohms, and fLPF is in kHz
A ±5% resistor should be used to set the filter bandwidth. This will provide a 3 dB filter bandwidth between fLPF and 1.3* fLPF
with variations in supply voltage, temperature, etc. The filter provides a three-pole, 0.05 degree equiripple phase response.
The peak drive current available from RXDATA increases in proportion to the filter bandwidth setting. Refer to sections 1.4.3,
2.5.1 and 2.6.1 in the ASH Transceiver Designer’s Guide for additional information on data rate adjustments.
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 a ground pin.
11
CTR1
CTR1 is connected to the CNTRL1 control pin on the transceiver. CTR1 and CTR0 select the transceiver operating modes.
CTR1 and CTR0 both high place the unit in the receive mode. CTR1 and CTR0 both low place the unit in the power-down
(sleep) mode. 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 (not used at 115.2 kbps). CTR1 is a high-impedance input (CMOS compatible). This pin must be
held at a logic level; it cannot be left unconnected. At turn on, the voltage on this pin and CTR0 should rise with VCC until
VCC reaches 2.7 Vdc (receive mode). Thereafter, any mode can be selected.
12
CTR0
CTR0 is connected to the CNTRL0 control pin on the transceiver CTR0 is used with CTR1 to control the operating modes of
the transceiver. CTR0 is a high-impedance input (CMOS compatible). This pin must be held at a logic level; it cannot be left
unconnected. At turn on, the voltage on this pin and CTR1 should rise with VCC until VCC reaches 2.7 Vdc (receive mode).
Thereafter, any mode can be selected.
13
RFIO
RFIO is the RF input/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 transceiver
module to an external antenna, the coaxial cable ground is connected this pin and the coaxial cable center conductor is connected to RFIO.
115.2 kbps Application Circuit
R/T
12
3 Vdc
11
10
9
8
13
7
DR3000-1
14
1
6
2
3
4
0.001 µF
5
3.3 K
Data In
Data Out
2200 pF
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: [email protected]
http://www.rfm.com
DR3000-1-060304
Page 4 of 5
916.50 MHz
Transceiver Module
DR3000-1 Bill of Materials
Item
Reference
Description
Value
Quanitity
1
U1
TR1000 ASH Transceiver
916.50 MHz
1
2
C1, C4, C6
Capacitor SMT 0603
100 pF ±10%
3
3
C3
Capacitor SMT 0603
0.0027 µF ±10%
1
4
C5
Capacitor E1A-B 0805
4.7 µF ±10%
1
5
R1
Resistor Chip 0603
1 M ±5%
1
6
R2
Resistor Chip 0603
160 K ±5%
1
7
R3, R4, R8
Resistor Chip 0603
100 K ±1%
3
8
R5
Resistor Chip 0603
4.7 K ±5%
1
9
R6
Resistor Chip 0603
12 K ±5%
1
10
L1
Inductor Chip 0603
10 nH ±5%
1
11
L2
Inductor Chip 0603
100 nH ±10%
1
12
L3
Fair-Rite Bead 0603
2506033017YO
1
13
PCB
Printed Circuit Board
400-1526-004X1
1
-
C2, R7
Not Used
N/A
0
8
Note: Preliminary specitications, subject to change without notice.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: [email protected]
http://www.rfm.com
DR3000-1-060304
Page 5 of 5