MICRF505
Micrel
MICRF505
868MHz and 915MHz ISM Band Transceiver
General Description
The MICRF505 is a true single chip, frequency shift keying
(FSK) transceiver intended for use in half-duplex, bidirec-
tional RF links. The multi-channeled FSK transceiver is
intended for UHF radio equipment in compliance with the
North American Federal Communications Commission (FCC)
part 15.247 and 249, as well as the European Telecommuni-
cation Standard Institute (ETSI) specification, EN300 220.
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 output power of the
power amplifier can be programmed to seven 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 which
makes 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 pre-amplifier, a third order Sallen-Key RC
low-pass filter that protects the following switched-capacitor
filter from strong adjacent channel signals, and a limiter. The
main channel filter is a switched-capacitor implementation of
a six-pole elliptic low pass filter. The cut-off frequency of the
Sallen-Key RC filter can be programmed to four different
frequencies: 100kHz, 150kHz, 230kHz, and 340kHz. The I
and Q channel outputs are demodulated and produce a
digital data output. The demodulator detects the relative
phase of the I and the Q channel signal. If the I channel signal
lags behind the Q channel, the FSK tone frequency is above
the LO frequency (data ‘1’). If the I channel leads the Q
channel, the FSK tone is below the LO frequency (data ‘0’).
The output of the receiver is available on the DataIXO pin. A
receive signal strength indicator (RSSI) circuit indicates the
received signal level. All support documentation can be
found on Micrel’s web site at www.micrel.com.
Features
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True single chip transceiver
Digital bit synchronizer
Received signal strength indicator (RSSI)
RX and TX power management
Power down function
Reference crystal tuning capabilities
Baseband shaping
Three-wire programmable serial interface
Register read back function
Telemetry
Remote metering
Wireless controller
Remote data repeater
Remote control systems
Wireless modem
Wireless security system
Applications
Ordering Information
Part Number
MICRF505BML
Junction Temp. Range
–40∞C to +85∞C
Package
32-Pin MLF™
Micro
LeadFrame and MLF are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 13, 2004
1
M9999-051304
MICRF505
Micrel
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
) ................................................. +3.3V
Voltage on any pin (GND = 0V) ................. –0.3V to 2.7V
Lead Temperature (soldering, 4 sec.) ...................... TBD∞C
Storage Temperature (T
S
) ....................... –55∞C to +150∞C
ESD Rating
(3) ...............................................................................
2kV
Operating Ratings
(2)
Supply Voltage (V
IN
) ................................... +2.0V to +2.5V
RF Frequencies ................................... 850MHz to 950MHz
Data Rate (NRZ) .............................................. < 200kBaud
Ambient Temperature (T
A
) ......................... –40∞C to +85∞C
Package Thermal Resistance
MLF™
(q
JA
) multi-layer board .......................... 41.7∞C/W
Electrical Characteristics
(4)
f
RF
= 915MHz, Data-rate = 125kbps, Modulation type = closed-loop VCO modulation, V
DD
= 2.5V; T
A
= 25∞C,
bold
values indicate
–40∞C
£
T
A
£
+85∞C; unless noted.
Symbol
Parameter
RF Frequency Operating Range
Power Supply
Power Down Current
Standby Current
VCO and PLL Section
Reference Frequency
PLL Lock Time
3kHz bandwidth
915MHz to 915.5MHz
902MHz to 927MHz
20kHz bandwidth
Switch Time
3kHz loop bandwidth
Rx – Tx
Tx – Rx
Standby Rx
Standby Tx
Crystal Oscillator Start-Up Time
Charge Pump Current
16MHz, 9pF load, 5.6pF loading capacitors
VCP
OUT
= 1.1V, CP_HI = 0
VCP
OUT
= 1.1V, CP_HI = 1
Charge Pump Tolerance
Transmit Section
Output Power
R
LOAD
= 50W, Pa2-0-111
R
LOAD
= 50W, Pa2-0-001
Output Power Tolerance
Over temperature range
Over power supply range
Tx Current Consumption
R
LOAD
= 50W, Pa2-0-111
R
LOAD
= 50W, Pa2-0-001
Tx Current Consumption Variation
Binary FSK Frequency Separation
(5)
Data Rate
(5)
Occupid bandwidth
10dBm
bitrate = 200kbps
VCO modulation
20kbps,
b
= 2, 20dBc
125kbps,
b
= 2, 20dBc
200kbps,
b
= 2, 20dBc
2nd Harmonic
3rd Harmonic
Spurious Emission < 1GHz
(5)
Spurious Emission < 1GHz
(5)
M9999-051304
–25
–15
< –54
< –30
20
20
10
–8
2
3
28
14
2.5
500
200
dBm
dBm
dB
dB
mA
mA
mA
kHz
kbps
kHz
kHz
kHz
dBm
dBm
dBm
dBm
4
0.5
1.7
0.3
0.6
0.6
1.1
1.2
1.2
125
500
20
40
MHz
ms
ms
ms
ms
ms
ms
ms
ms
mA
mA
%
Condition
Min
850
2.0
0.3
280
Typ
Max
950
2.5
Units
MHz
V
mA
mA
4
May 13, 2004
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