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RF83C Schematic ( PDF Datasheet ) - HOPERF

Teilenummer RF83C
Beschreibung 300 - 440MHz ASK/OOK Receiver
Hersteller HOPERF
Logo HOPERF Logo 




Gesamt 22 Seiten
RF83C Datasheet, Funktion
RF83/RF83C ASK/OOK Receiver V1.1
RF83/RF83C 300~440MHz ASK/OOK Receiver
General Description
The RF83/RF83C is a single chip ASK/OOK (ON-OFF
Keyed) RF receiver IC. This device is a true antenna-in to
data-out‖ monolithic device. All RF and IF tuning are
accomplished automatically within the IC which
eliminates manual tuning and reduces production costs.
The result is a highly reliable yet low cost solution.
The RF83 is a fully featured part in 16-pin packaging
and the RF83C is a reduced function set part packaged in
8-pin packaging . The RF83/RF83C operating voltage
range is 3.6V-5.5V, Their low voltage counterparts are
RF83L/RFM83CL at 2.1V-3.6V.
The RF83 provides two additional functions, (1) a
Shutdown pin, which may be used to turn the device off
for duty-cycled operation, and (2) a Wake-up‖ output,
which provides an output flag indicating when an RF
signal is present. These features make the RF83 ideal for
low and ultra-low power applications, such as RKE and
remote controls.
All IF filtering and post-detection (demodulator) data
filtering is provided within the RF83/RF83C, so no
external filters are necessary.
The RF83 offer two modes of operation; fixed-mode (FIX) and sweep-mode (SWP). In fixed mode the RF83
functions as a conventional super-heterodyne receiver. In sweep mode the RF83 sweeps a wider RF spectrum.
Fixed-mode provides better selectivity and sensitivity performance and sweep mode enables the RF83 to be
used with low cost, imprecise transmitters.
Features
Applications
300MHz to 440MHz frequency range
Operating voltage: 3.6V-5.5V( RF83/RF83C)
2.1V-3.6V(RF83L/RF83CL)
High receiver sensitivity: -108dBm (315MHz)
Automotive Remote Keyless Entry(RKE)
Remote controls
Remote fan and light control
Garage Door and gate openers
-108dBm (433MHz)
Data-rate up to 10kbps (fixed-mode)
Low Power Consumption
3mA fully operational (315MHz,RF83)
0.9µA in shutdown
Wake-up output flag to enable decoders and microprocessors
Highly integrated with extremely low external part count
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
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RF83C Datasheet, Funktion
RF83/RF83C ASK/OOK Receiver V1.1
10 5 DO Data Output (Digital Output)
11 6 SHUT Shutdown (Digital Input): Shutdown-mode logic-level
control input. Pull low to enable the receiver. Internally
pulled-up to VDDRF
12 WAKEB Wakeup (Digital Output): Active-low output that indicates
detection of an incoming RF signal
13 7 CAGC Automatic Gain Control (Analog I/O): Connect an external
capacitor to set the attack/decay rate of the on-chip
automatic gain control
14 SEL1 Bandwidth Selection Bit 1 (Digital Input): Used in
conjunction with SEL0 to set the desired demodulator filter
bandwidth. See Table 1. Internally pulled-up to VDDRF
Reference Oscillator: Timing reference, sets the RF receive
15 8 REFOSC
frequency.
16 SWEN Sweep-Mode Enable (Digital Input): Sweep- or
Fixed-mode operation control input. SWEN high = sweep
mode; SWEN low = conventional superheterodyne
receiver. Internally pulled-up to VDDRF
9. Absolute Maximum Ratings (Note 1)
Supply Voltage (VDDRF, VDDBB)
Input/Output Voltage (VI/O)
Junction Temperature (TJ)
Storage Temperature Range (TS)
Lead Temperature (soldering, 10 sec.)
ESD Rating
+7V
VSS0.3 to VDD+0.3
+150°C
65°C to +150°C
+260°C
Note 3
10.Operating Ratings (Note 2)
RF Frequency Range
Data Duty-Cycle
Reference Oscillator Input Range
Ambient Temperature (TA)
300MHz to 440MHz
20% to 80%
0.1VPP to 1.5VPP
35°C to +85°C
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
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RF83C pdf, datenblatt
RF83/RF83C ASK/OOK Receiver V1.1
13.1.1.3. Crystal or Ceramic Resonator Selection
If operating in fixed-mode, a crystal is recommended. In sweep-mode either a crystal or ceramic resonator
may be used. When a crystal of ceramic resonator is used the minimum voltage is 300mVPP. If using
an externally applied signal it should be AC-coupled and limited to theoperating range of 0.1VPP to
1.5VPP.
13.1.1.4. Selecting Reference Oscillator Frequency fT (Fixed Mode)
As with any superheterodyne receiver, the mixing between the internal LO (local oscillator) frequency fLO
and the incoming transmit frequency fTX ideally must equal the IF center frequency. Equation 1 may be used
to compute the appropriate fLO for a given fTX:
(1) fLO =fTX ±(0.86
fTX )
315
Frequencies fTX and fLO are in MHz. Note that two values of fLO exist for any given fTX,
distinguished as high-side mixing‖ and low-side mixing.High-side mixing results in an image
frequency above the frequency of interest and low-side mixing results in a frequency below.
After choosing one of the two acceptable values of fLO, use Equation 2 to compute the reference
oscillator frequency fT:
(2) fT = FLO
64.5
Frequency fT is in MHz. Connect a crystal of frequency fT to REFOSC on the RF83.
Four-decimal-place accuracy on the frequency is generally adequate. The following table
identifies fT for some common transmit frequencies when the RF83 is operated in fixed
mode.
Transmit Frequency (fTX)
315MHz
Reference Oscillator Frequency (fT)
4.8970 MHz
390 MHz
6.0630 MHz
418 MHz
6.4983 MHz
433.92 MHz
6.7458 MHz
Table 2. Fixed Mode Recommended Reference Oscillator Values For Typical Transmit
Frequencies (high-side mixing)
13.1.1.5. Selecting REFOSC Frequency fT (Sweep Mode)
Selection of the reference oscillator frequency fT in sweep mode is much simpler than in fixed
mode due to the LO sweeping process. Also, accuracy requirements of the frequency reference
component are significantly relaxed.
In sweep mode, fT is given by Equation 3:
(3) fT =
FLO
64.25
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
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