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RF83L Schematic ( PDF Datasheet ) - HOPERF

Teilenummer RF83L
Beschreibung 300 - 440MHz ASK/OOK Receiver
Hersteller HOPERF
Logo HOPERF Logo 




Gesamt 21 Seiten
RF83L Datasheet, Funktion
Receiver V1.0
RF83L 300~440MHz ASK/OOK
RF83L 300MHz-440MHz ASK/OOK Receiver
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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Features
300MHz to 440MHz frequency range
Operational voltage: 2.2V-3.6V
High receiver sensitivity: -108dBm
Data-rate up to 10kbps (fixed-mode)
Low Power Consumption
2.5mA fully operational at 315MHZ,
3.5mA fully operational at 433MHZ,
0.9µA in shutdown
300µA in polled operation (10:1 duty-cycle)
Wake-up output flag to enable decoders and microprocessors
Very low RF re-radiation at the antenna
Highly integrated with extremely low external part count
16PIN SOP
Applications
Automotive Remote Keyless Entry (RKE)
Remote controls
Remote fan and light control
Garage door and gate openers
8PIN SOP
RF83L
The RF83L 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
RF83L is a fully featured part in 16-pin packaging and The RF83A/B/C/DL is a same part packaged in 8-
pin packaging with a reduced feature set.
The RF83L 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 RF83L 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 RF83L, so no external
filters are necessary. One of four demodulator filter bandwidths may be selected externally by the user.
The RF83L offer two modes of operation; fixed-mode (FIX) and sweep-mode (SWP). In fixed mode the
RF83L functions as a conventional super-heterodyne receiver. In sweep mode the RF83L sweeps a wider RF
spectrum. Fixed-mode provides better selectivity and sensitivity performance and sweep mode enables the
RF83L to be used with low cost, imprecise transmitters.
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
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RF83L Datasheet, Funktion
RF83L 300~440MHz ASK/OOK Receiver V1.0
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
15
8
REFOSC
Reference Oscillator: Timing reference, sets the RF receive
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
7. 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
+5.5V
VSS–0.3 to VDD+0.3
+150°C
–65°C to +150°C
+260°C
Note 3
8.Operating Ratings (Note 2)
RF Frequency Range
Supply Voltage (VDDRF, VDDBB, 300~440MHz)
Data Duty-Cycle
Reference Oscillator Input Range
Ambient Temperature (TA)
300MHz to 440MHz
+2.2V to +3.6V
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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RF83L pdf, datenblatt
RF83L 300~440MHz ASK/OOK Receiver V1.0
In SWEEP mode a reference oscillator with frequency accurate to two-decimal-places is generally
adequate. A crystal may be used and may be necessary in some cases if the transmit frequency is
particularly imprecise.
Transmit Frequency (fTX)
315MHz
390 MHz
418 MHz
433.92 MHz
Reference Oscillator Frequency (fT)
4.88 MHz
6.05 MHz
6.48 MHz
6.73 MHz
Table 3. Recommended Reference Oscillator Values For Typical Transmit Frequencies
(sweep-mode)
12.3. Step 3: Selecting the CTH Capacitor
Extraction of the dc value of the demodulated signal for purposes of logic-level data slicing is
accomplished using the external threshold capacitor CTH and the on-chip switched-capacitor
“resistor” RSC, shown in the block diagram.
Slicing level time constant values vary somewhat with decoder type, data pattern, and data rate,
but typically values range from 5ms to 50ms. Optimization of the value of CTH is required to
maximize range.
12.3.1. Selecting Capacitor CTH
The first step in the process is selection of a data-slicing-level time constant. This selection is
strongly dependent on system issues including system decode response time and data code
structure (that is, existence of data preamble, etc.). This issue is covered in more detail in
Application Note 22.
The effective resistance of RSC is listed in the electrical characteristics table as 145kat 315MHz,
this value scales linearly with frequency. Source impedance of the CTH pin at other frequencies is
given by equation (4), where fT is in MHz:
(4) RSC =145k
4.8970
fT
τ of 5x the bit-rate is recommended. Assuming that a slicing level time constant τ has been
established, capacitor CTH may be computed using equation
(5) CTH =
τ
RSC
A standard ±20% X7R ceramic capacitor is generally sufficient. Refer to Application Hint 42 for
CTH and CAGC selection examples.
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
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