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參數(shù)資料
| 型號(hào)： | MICRF501 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 512 MACROCELL 3.3 VOLT ZERO POWER ISP CP - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 300MHz至600MHz的RadioWire⑩射頻收發(fā)器 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 141K |
| 代理商： | MICRF501 |
March 2003
1
MICRF501
MICRF501
Micrel
MICRF501
300MHz to 600MHz RadioWire RF Transceiver
Final
General Description
The MICRF501 is a single chip tranceiver intended for ISM
(Industrial, Scientific and Medical) and SRD (Short Range
Device) frequency bands from 300MHz to 600MHz with FSK
data rates up to 128k baud.
The transmitter consists of a PLL frequency synthesizer and
a power amplifier. The frequency synthesizer consists of a
voltage-controlled oscillator (VCO), a crystal oscillator, dual-
modulus prescaler, programmable frequency dividers and a
phase-detector. The loop filter is external for flexibility and
can be a simple passive circuit. The VCO is a Colpitts
oscillator which requires an external resonator and varactor.
FSK modulation can be applied externally to the VCO or the
crystal oscillator. The synthesizer has two different N, M and
A frequency dividers. FSK modulation can also be imple-
mented by switching between these dividers (max. 2400bps).
The lengths of the N and M and A registers are 12, 10 and 6
bits respectively. For all types of FSK modulation, data is
entered at the DATAIXO pin (see application circuit). The
output power of the power amplifier can be programmed to
eight levels. A lock-detect circuit detects when the PLL is in
lock.
In receive mode the PLL synthesizer generates the local
oscillator (LO) signal. The N, M and A values that give the LO
frequency are stored in the N0, M0 and A0 registers. The
receiver is a zero intermediate frequency (IF) type in order to
make channel filtering possible with low-power integrated
low-pass filters. The receiver consists of a low noise amplifier
(LNA) that drives a quadrature mixer pair. The mixer outputs
feed two identical signal channels in phase quadrature. Each
channel includes a preamplifier, a third order Sallen-Key RC
low pass filter that protects the following gyrator filter from
strong adjacent channel signals and finally, a limiter. The
main channel filter is a gyrator capacitor implementation of a
seven-pole elliptic low pass filter. The elliptic filter minimizes
the total capacitance required for a given selectivity and
dynamic range. The cut-off frequency of the Sallen-Key RC
filter can be programmed to four different frequencies: 10kHz,
30kHz, 60kHz and 200kHz. An external resistor adjusts the
cut-off frequency of the gyrator filter. The demodulator de-
modulates the I and Q channel outputs and produces a digital
data output. It detects the relative phase of the I and the Q
channel signal. If the I channel signal lags the Q channel, the
FSK tone frequency lies above the LO frequency (data ‘1’). If
the I channel leads the Q channel, the FSK tone lies below the
LO frequency (data ‘0’). The output of the receiver is available
on the DATAIXO pin. A RSSI (Receive Signal Strength
Indicator) circuit indicates the received signal level.
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
Features
Frequency range: 300MHz to 600MHz
Modulation: FSK
RF output power: 12dBm
Sensitivity (19.2k bauds, BER=10
-3
): –105dBm
Maximum data rate: 128k bauds
Applications
Telemetry
Remote metering
Wireless controller
Wireless data repeaters
Remote control systems
Wireless modem
Wireless security system
Ordering Information
Part Number
MICRF501BLQ
Ambient Temp. Range
–40
°
C to +85
°
C
Package
44-Lead LQFP
RadioWire is a trademark of Micrel, Inc.
A two pin serial interface is used to program the circuit.
External components are necessary for RF input and output
impedance matching and decoupling of power. Other exter-
nal components are the VCO resonator circuit with varactor,
crystal, feedback capacitors and components for FSK modu-
lation with the VCO, loop filter, bias resistors for the power
amplifier and gyrator filters. A T/R switch can be implemented
with 2-pin diodes. This gives maximum input sensitivity and
transmit output power.
RadioWire
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