1
®
DR3000-1
916.50 MHz
Transceiver
Module
The DR3000-1 transceiver module is ideal for short-range wireless data applications where ro-
bust operation, small size and low power consumption are required. The DR3000-1 utilizes
RFM’s TR1000 amplifier-sequenced 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-of-band rejection. The transmit-
ter includes provisions for both on-off keyed (OOK) and amplitude-shift keyed (ASK) modula-
tion. 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 configu-
ration components in a ready-to-use PCB assembly, excellent for prototyping and intermediate
volume production runs.
Rating Value Units
Power Supply and All Input/Output Pins -0.3 to +4.0 V
Non-Operating Case Temperature -50 to +100 oC
Soldering Temperature (10 seconds) 230 oC
Absolute Maximum Ratings
·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
Electrical Characteristics, 115.2 kbps Amplitude-Shift Keyed
Characteristic Sym Notes Minimum Typical Maximum Units
Operating Frequency fO916.30 916.70 MHz
Modulation Type ASK
Data Rate 115.2 kbps
Receiver Performance (ASK @ 115.2 kbps)
Input Current, 3 Vdc Supply IR4.8 mA
Input Signal for 10-4 BER, 25 °C-85 dBm
Rejection, ±30 MHz RREJ 55 dB
Transmitter Performance (ASK @ 115.2 kbps)
Peak Input Current, 3 Vdc Supply ITP 12 mA
Peak Output Power PO0.75 mW
Turn On/Turn Off Time tON/tOFF 1.1/1.1 µs
Sleep to Receive Switch Time (15 ms sleep, -76 dBm signal) tSR 20 µs
Sleep Mode Current ISA
Transmit to Receive Switch Time (15 ms transmit, -76 dBm signal) tTOR 20 µs
Receive to Transmit Switch Time tRTO 12 µs
Power Supply Voltage Range VCC 2.7 3.5 Vdc
Operating Ambient Temperature TA-40 +85 oC
2
D R 3000-1 P in O ut
RF
GND RFIO
AGC/VCC
PK DET
TX IN
RX BBO
RX DATA
CTR0
CTR1
GND
VCC
LPF AD J
1
2
3
4
58
9
10
11
12
1314
67
GND GND
.7 0
.2 5 .2 0
.1 6 5
.7 0
.1 0
D R 3000-1 O utline D raw ing
D im e n s io n s in in c h e s
R3
R4
R8
R1 R2
R6R5
C3
C2
L2
C1
L1
C4 C5
+
A SH Transceiver
20
1
11
10
CTR0 (12)
CTR1 (11)
VCC (9)
LPF AD J (8)
G N D (6, 7, 10)
RFIO
(1 3 )
RF GND
(1 4 )
AGC/VCC
(1 )
PK DET
(2 )
RX BBO
(3 )
RX DATA
(4 )
TX IN
(5 )
D R 3000-1 Schem atic
C6
Pin Name Description
1 AGC/VCC
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
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. How-
ever, 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.
2 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 ca-
pacitor 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 ex-
tended beyond the peak detector decay time with the AGC capacitor, as discussed above. The peak detector ca-
pacitor is discharged in the transceiver power-down (sleep) mode and in the transmit modes. See the description
of Pin 3 below for further information.
3 RX BBO
This pin is connected directly to the transceiver BBOUT pin. On the circuit board, BBOUT also drives the trans-
ceiver 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 sig-
nal 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 ca-
pacitor to an external load. A load impedance of 50 K to 500 K in parallel with no more than 10 pF is recom-
mended. 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.
4 RX DATA
RX DATA is connected directly to the transceiver data output pin, RXDATA. This pin will drive a 10 pF, 500 K par-
allel 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.
5TXIN
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 de-
sired 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 POfor a 3 Vdc supply is approximately:
PO= 4.8*((VTXH 0.9)/(RM+ 4.7))2, where POis in mW, peak modulation voltage VTXH is in volts and
external modulation resistor RMis in kilohms
This pin must be held low in the receive and sleep modes. Please refer to section 2.9 of the ASH Transceiver De-
signer’s Guide for additional information.
6 GND This is a ground pin.
7 GND This is a ground pin.
3
Pin Descriptions
8 LPF ADJ
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 typ-
ical 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:
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 providea3dBfilter 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 pos-
sible 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 operat-
ing 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 in-
put (CMOS compatible). This pin must be held at a logic level; it cannot be left unconnected. At turn on, the volt-
age 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.
4
D a ta In
Data Out
3 VdcR/T
115.2 kbps Application C ircuit
3.3 K
12345
678910
11
12
D R 3000-1
2200 pF
0.001 µF
Item Reference Description Value Quantity
1 IC1 TR1000 ASH Transceiver 916.5 MHz 1
2 C1, C2, C4, C6 Capacitor SMT 0603 100 pF ±10% 4
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 PCB Printed Circuit Board 400-1526-002X1 1
5
DR3000-1 Bill of Materials
Note: Specifications subject to change without notice.
File: dr30001g.vp, 2001.09.21 rev