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PDF RF83 Data sheet ( Hoja de datos )
| Número de pieza | RF83 | |
| Descripción | 300 ~ 440MHz ASK Receiver | |
| Fabricantes | HOPE MICROELECTRONICS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RF83 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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RF83 300~440MHz ASK Receiver V1.1
Contents
1. General Description ................................................................................................................1
2. Features....................................................................................................................................1
3. Applications .............................................................................................................................1
4. Typical Application .................................................................................................................2
5. Ordering Information.............................................................................................................3
6. Pin Configuration....................................................................................................................3
7. 8-Pin Options ...........................................................................................................................4
8. Pin Description ........................................................................................................................4
9. Absolute Maximum Ratings (Note 1) ....................................................................................5
10. Operating Ratings (Note 2) ....................................................................................................5
11. Electrical Characteristics .......................................................................................................6
12. Functional Diagram ................................................................................................................8
13. Applications Information and Functional Description ........................................................8
13.1.
Design Steps..........................................................................................................8
13.1.1.
Step 1: Selecting the Operating Mode..................................................................9
13.1.2.
Step 2: Selecting the Reference Oscillator ...........................................................9
13.1.3.
13.1.4.
13.1.5.
Step 3: Selecting the CTH Capacitor ..................................................................... 11
Step 4: Selecting the CAGC Capacitor ...................................................................12
Step 5: Selecting the Demod Filter Bandwidth ........................................ ........ ..13
14. Additional Applications Information ............www..DataS.heet..net/......................................................................14
14.1.
Antenna Impedance Matching ................................................................................14
14.2.
Shutdown Function .................................................................................................16
14.3.
Power Supply Bypass Capacitors............................................................................16
14.4.
Increasing Selectivity with an Optional BandPass Filter ........................................16
14.5.
Data Squelching ......................................................................................................16
14.6.
Wake-Up Function ..................................................................................................16
15. Package Information................................................................................................................18
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
RF83 300~440MHz ASK Receiver V1.1
7. 8-Pin Options
The standard 16-pin package allows complete control of all configurable features. Some reduced
function 8-pin versions are also available.
For high-volume applications additional customized 8-pin devices can be produced. SWEN, SEL0
and SEL1 pins are internally bonded to reduce the pin count. Pin 6 may be configured as either
SHUT or WAKEB.
SEL0
1
0
1
0
SEL1
1
1
0
0
Demodulator Bandwidth
Sweep Mode
Fixed Mode
5000 Hz
10000Hz
2500 Hz
5000Hz
1250 Hz
2500 Hz
625 Hz
1250 Hz
Table 1. Nominal Demodulator Filter Bandwidth vs. SEL0, SEL1 and Operating Mode
8. Pin Description
Pin Number
16-Pin Pkg.
1
2, 3
4
5
6
7
8
9
Pin Number
8-Pin Pkg.
1
2
3
4
Pin
Name
SEL0
VSSRF
ANT
VDDRF
VDDBB
CTH
NC
VSSBB
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Pin Function
Bandwidth Selection Bit 0 (Digital Input): Used in
conjunction with SEL1 to set the desired demodulator filter
bandwidth. See Table 1. Internally pulled-up to VDDRF
RF Power Supply: Ground return to the RF section power
supply.
Antenna (Analog Input): For optimal performance the
ANT pin should be impedance matched to the antenna. See
“Applications Information” for information on input
impedance and matching techniques
RF Power Supply: Positive supply input for the RF section
of the IC
Base-Band Power Supply: Positive supply input for the
baseband section (digital section) of the IC
Data Slicing Threshold Capacitor (Analog I/O): Capacitor
connected to this pin extracts the dc average value from the
demodulated waveform which becomes the reference for
the internal data slicing comparator
Not internally connected
Base-Band Power Supply: Ground return to the baseband
section power supply
-4-
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
RF83 300~440MHz ASK Receiver V1.1
13.1.1.3. Crystal or Ceramic Resonator Selection
Do not use resonators with integral capacitors since capacitors are included in the IC, also care should be
taken to ensure low ESR capacitors are selected. Application Hint 34 and Application Hint 35 provide
additional information and recommended sources for crystals and resonators.
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 the
operating 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
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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)
Reference Oscillator Frequency (fT)
315MHz
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
- 10 -
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet RF83.PDF ] | |
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