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PDF DR3000 Fiche technique ( Data sheet )

Numéro de référence DR3000
Description 916.50 MHz Transceiver Module
Fabricant RF Monolithics 
Logo RF Monolithics Logo 



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DR3000 Datasheet, Description
www.DataSheet4U.com
®
• Designed for Short-Range Wireless Data Communications
• Supports 2.4-19.2 kbps Encoded Data Transmissions
• 3 V, Low Current Operation plus Sleep Mode
• Ready to Use OEM Module
The DR3000 transceiver module is ideal for short-range wireless data applications where robust operation,
small size and low power consumption are required. The DR3000 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 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 compli-
ance with FCC 15.249 and similar regulations. The DR3000 includes the TR1000 plus all configuration com-
ponents in a ready-to-use PCB assembly, excellent for prototyping and intermediate volume production runs.
DR3000
916.50 MHz
Transceiver
Module
Absolute Maximum Ratings
Rating
Power Supply and All Input/Output Pins
Non-Operating Case Temperature
Soldering Temperature (10 seconds)
Value
-0.3 to +4.0
-50 to +100
230
Units
V
°C
°C
Electrical Characteristics, 2.4 kbps On-Off Keyed
Operating Frequency
Characteristic
Modulation Type
Data Rate
Receiver Performance (OOK @ 2.4 kbps)
Input Current, 3 Vdc Supply
Input Signal for 10-3 BER, 25 °C
Rejection, ±30 MHz
Transmitter Performance (OOK @ 2.4 kbps)
Peak Input Current, 3 Vdc Supply
Peak Output Power
Turn On/Turn Off Time
Sleep to Receive Switch Time (100 ms sleep, -85 dBm signal)
Sleep Mode Current
Transmit to Receive Switch Time (100 ms transmit, -85 dBm signal)
Receive to Transmit Switch Time
Power Supply Voltage Range
Operating Ambient Temperature
Sym
fO
IR
RREJ
ITP
PO
tON/tOFF
tSR
IS
tTOR
tRTO
Vcc
TA
Notes
Minimum
916.30
55
2.7
-40
Typical
Maximum
916.70
OOK
2.4
-100
3.1
0.75
200
0.7
200
12
12/6
12
3.5
+85
Units
MHz
kbps
mA
dBm
dB
mA
mW
µs
µs
µA
µs
µs
Vdc
°C
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: info@rfm.com
http://www.rfm.com
DR3000-060404
Page 1 of 5
DR3000 Fiche technique
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916.50 MHz
Transceiver Module
Pin Descriptions
Pin Name
Description
This pin is connected directly to the transceiver AGCCAP pin. To disable AGC operation, this pin is tied to VCC. To enable
AGC operation, a capacitor is placed between this pin and ground. This pin controls the AGC reset operation. A capacitor
between this pin and ground 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
A ±10% ceramic capacitor should be used at this pin. The value of CAGC given above provides a hold-in time between tAGH
1 AGC/VCC 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. The use of AGC is optional when
using OOK modulation with data pulses of at least 30 µs. Active or latched AGC operation is required for ASK modulation
and/or for data pulses of less than 30 µs. The AGC can be latched ON once engaged by connecting a 150 K resistor
between this pin and ground, instead of a capacitor. AGC operation 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. Note that
provisions are made on the circuit board to install a jumper between this pin and the junction of C2 and L3. Installing the
jumper allows either this pin or Pin 7 to be used for the Vcc supply when AGC operation is not required.
This pin is connected directly to the transceiver PKDET pin. This pin controls the peak detector operation. A capacitor
between this pin and ground sets the peak detector attack and decay times, which have a fixed 1:1000 ratio. For most appli-
cations, the attack time constant should be set to 6.4 ms with a 0.027 µF capacitor to ground. (This matches the peak detec-
tor decay time constant to the time constant of the 0.1 µF coupling capacitor C3.) A ±10% ceramic capacitor should be used
2
PK DET
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. Where low data
rates and OOK modulation are used, the “dB-below-peak” data slicer and the AGC are optional. In this case, the PKDET pin
can be left unconnected, and the AGC pin can be connected to VCC to reduce the number of external components needed.
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.
This pin is connected directly to the transceiver BBOUT pin. On the circuit board, BBOUT also drives the transceiver CMPIN
pin through C3, a 0.1 µF coupling capacitor (tBBC = 6.4 ms). 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 sup-
3 RX BBO ply 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 cho-
sen to match typical data encoding schemes at 2.4 kbps. If C3 is modified to support higher data rates and/or different data
encoding schemes and PK DET is being used, make the value of the peak detector capacitor about 1/3 the value of C3.
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
4
RX DATA
(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.
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: info@rfm.com
http://www.rfm.com
DR3000-060404
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