MICRF507 Datasheet, PDF (1/46 Pages) Micrel Semiconductor – 470MHz to 510MHz Low-Power FSK Transceiver with +10dBm Power Amplifier

MICRF507
470MHz to 510MHz Low-Power FSK
Transceiver with +10dBm Power Amplifier
General Description
The MICRF507 is a fully integrated FSK transceiver with
+10dBm power amplifier and transmit/receive switch. The
device is targeted at automated meter reading (AMR)
applications in the China Short Range Device (SRD)
frequency band of 470MHz to 510MHz. The device
supports data rates up to 20kbps with PLL divider
modulation and up to 200kbps with VCO modulation. The
receiver achieves a sensitivity of -113dBm at a data rate of
2.4kbps while only consuming 12mA of supply current.
The integrated power amplifier (PA) delivers +10dBm of
output power while only consuming 21.5mA of supply
current. Power down supply current is a low 0.2µA while
retaining register information and a low 280µA in standby
mode where only the crystal oscillator is enabled.
The receiver of the MICRF507 utilizes a Zero IF (ZIF) I/Q
architecture, integrating a low-noise amplifier (LNA) with
bypass mode, I/Q quadrature mixers, three-pole Sallen-
Key IF channel pre-filters, and six-pole elliptic switched
capacitor IF filters, providing excellent selectivity, adjacent
channel rejection and blocking performance. FSK
demodulation is implemented digitally and a synchronizer,
when enabled, recovers the received bit clock. A receive
signal strength indicator (RSSI) circuit indicates the
received signal level over a 50dB range. An integrated
Frequency Error Estimator (FEE) and crystal tuning
capability allow fine tuning of the RF frequency.
The transmitter of the MICRF507 consists of an FSK
modulator and power amplifier with output power
adjustable from +10dBm to -3.5dBm in seven steps.
Modulation can be achieved by applying two sets of PLL
divider ratios or through direct VCO modulation by varying
VCO tank capacitance.
The MICRF507 requires a 2.0V to 2.5V supply voltage,
operates over the -40˚C to +85˚C temperature range, and
is available in a 32-pin MLF^® package.
Features
RadioWire^®
• -113dBm sensitivity at 2.4kbps encoded bit rate
• +10dBm power amplifier with seven gain steps
• 12mA receive supply current
• 21.5mA transmit supply current at +10dBm
• 0.2μA power down current (registers retain settings)
• 280µA standby current (crystal oscillator enabled)
• Data rates up to 20kbps with PLL divider modulation
• Data rates up to 200kbps with VCO modulation
• Integrated transmit and receive (T/R) switch
• LNA with bypass mode
• Zero IF I/Q receiver architecture
• IF pre-amplifiers with DC-offset removal
• Three-pole Sallen-Key IF channel low-pass pre-filter
• Six-pole elliptic switched capacitor IF low-pass filter
• 50kHz to 350kHz programmable baseband bandwidth
• 59dB blocking at ±1MHz offset
• 53dB adjacent channel rejection at ±500kHz offset
• FSK digital demodulator with clock recovery
• 50dB Received Signal Strength Indicator (RSSI)
• Frequency Error Estimator (FEE)
• Reference crystal tuning capability
• 2.0 to 2.5V supply voltage range
• -40˚C to +85˚C operating temperature range
• Available in 32-pin MLF^® package
(5.0mm x 5.0mm x 0.85mm)
Applications
• China Short Range Device (SRD) Communications
• Automated Meter Reading (AMR)
• Advanced Metering Infrastructure (AMI)
• Wireless Remote Meter Reading
RadioWire is a registered trademark of Micrel, Inc.
MLF is a registered trademark of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 2010
M9999-032210-B