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PDF MICRF007 Data sheet ( Hoja de datos )
| Número de pieza | MICRF007 | |
| Descripción | QwikRadio Low-Power UHF Receiver | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MICRF007
Micrel
MICRF007
QwikRadio® Low-Power UHF Receiver
General Description
The MICRF007 is a single chip, ON-OFF Keyed (ASK/OOK)
Receiver for remote wireless applications, employing Micrel’s
latest QwikRadio® technology.This device is a true “antenna-in
to data-out” monolithic device. All RF and IF tuning is accom-
plished automatically within the IC, which eliminates manual
tuning, and reduces production costs. The result is a highly
reliable yet extremely low cost solution. The MICRF007 is an
enhanced version of the MICRF002 and MICRF011.
The MICRF007 is a conventional superhetrodyne receiver,
with an (internal) Local oscillator fixed at a single frequency
based on an external reference crystal or clock. As with any
conventional superhetrodyne receiver, the companion trans-
mitter’s frequency must be accurately controlled, generally
with a crystal or SAW (surface acoustic wave) resonator.
The MICRF007 provides two enhancements over the MI-
CRF001/011: (1) a Shutdown Mode, which may be used for
duty-cycle operation, and (2) reduced current consumption.
The MICRF007 requires a mere 2.3mA at 315MHz (3.8mA
at 433.92MHz) when fully operational. These features make
the MICRF007 ideal for low and ultra-low power applications,
such as RKE and RFID.
All post-detection (demodulator) data filtering is provided on
the MICRF007, so no external baseband filters are required.
The demodulator filter bandwidth is fixed at 2.5kHz. Data
rates up to 3.2kbps NRZ may be used.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
Features
QwikRadio®
• Complete UHF receiver on a monolithic chip
• 300MHz to 440MHz
• Data rates up to 3.2kbps NRZ
• Automatic tuning, no manual adjustment
• Low power consumption
– 315MHz:
2.3 mA fully operational
0.5µA shutdown
230µA polled at a 10:1 duty cycle ratio
– 433.92MHz:
3.8mA fully operational
0.5µA shutdown
380µA polled at a 10:1 duty cycle ratio
• Virtually no RF re-radiation at the antenna
• CMOS logic interface to standard decoder and micro-
processor ICs
• Extremely low external part count
• No filters or inductors required
Applications
• Automotive remote keyless entry (RKE)
• Long range RF identification
• Remote fan and light control
• Garage door and gate openers
Typical Application
50Ω�Ant
1.8pF
56nH
MICRF007
VSS REFOSC
4.8970MHz
ANT
CAGC
+5V 2.2µF
VDD
SHUT
CTH
0.039µF
DO
Data
Output
315MHz 1200b/s On-Off Keyed Receiver
QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 17, 2005
1
M9999-021705
1 page  
MICRF007
Typical Characteristics
Supply Current
vs. Frequency
6.0
TA = 25°C
V DD = 5V
4.5
3.0
Continuous Operation
1.5
300 325 350 375 400 425 450
FREQUENCY (MHz)
Supply Current
vs. Temperature
3.5 f = 315MHz
V DD = 5V
3.0 Continuous Operation
2.5
2.0
1.5
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Micrel
February 17, 2005
5
M9999-021705
5 Page 
MICRF007
Application Example
315MHz Receiver/Decoder Application
Figure 10 illustrates a typical application for the MICRF007
UHF Receiver IC. This receiver operates continuously (not
duty cycled) in fixed-mode, and features 6-bit address decod-
ing and two output code bits.
Micrel
Operation in this example is at 315MHz, and may be cus-
tomized by selection of the appropriate frequency reference
(Y1), and adjustment of the antenna length. Changes from
the 1Kbps data rate may require a change in the value of R1.
A bill of materials accompanies the schematic.
+5V
Supply Input
1/4 monopole
antenna (23.1cm)
C4
1.8pF
L1
56nH
C1
4.7µF
C5
100µF
RF Baseband
(Analog) (Digital)
Ground Ground
C6
100pF
C2
39nF
U1 MICRF007
VSS REFOSC
Y1
4.8970MHz
ANT CAGC
VDD
CTH
SHUT
DO
R3
100k
C3
2.2µF
6-bit
address
U2 HT-12D
A0 VDD
A1 VT
A2 OSC1
A3 OSC2
A4 DIN
A5 D11
A6 D10
A7 D9
VSS
D8
R2
1k
R1
68k
Code Bit 0
Code Bit 1
Figure 10. 315MHz, 1Kbps On-Off Keyed Receiver with Decoder
Bill of Materials
Item Part Number
C1 GRM21BF51A475ZA01L
C2 VJ0603Y393KXXA
C3 GRM188R61A225XE348
C4 GRM1885C1H1R8CZ01B
C5 GRM188R71E104KA01B
C6 GRM1885C1H101JA01B
D1 SSF-LX100LID
L1 0603CS-56NX-B
R1 CRCW06036812F
R2 CRCW06031001F
R3 CRCW06031003F
U1 MICRF007BM
U2 HT-12D
Y1 AB-4.8970MHZ-20-D
Notes:
1. Vishay, tel. (203) 268-6261
2. Lumex, tel. (800) 278-5666
3. Micrel Inc., tel (408) 944-0800
4. Holteck, tel (408) 894-9046
5. Abracon, tel. (949) 448-7070
6. Coilcraft, tel. (510) 814-8954
7. Murata, tel (408) 397-1284
February 17, 2005
Manufacturer
Murata(7)
Vishay(1)
Murata(7)
Murata(7)
Murata(7)
Murata(7)
Lumex(2)
Coilcraft(6)
Vishay(1)
Vishay(1)
Vishay(1)
Micrel(3)
Holtek(4)
Abracon(5)
11
Description
4.7µF Y5V
39nF
2.2µF X5R
1.8pF COG ceramic capacitor
100nF capacitor
100pF capacitor
red LED
56mH wire wound, Q=38
68k; 1/4W; 5%
1k; 1/4W; 5%
100k
UHF Reciever
Logic decoder
4.8970MHz crystal
Qty.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
M9999-021705
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MICRF007.PDF ] | |
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