Specifications

108 Control and Automation Solutions Guide
Radio Links Ease Installation of Remote
Occupancy Sensors
MAX1472, MAX7057, MAX9636/MAX9637/MAX9638,
MAX9060–MAX9064
The MAX1472 and MAX7057 ISM-Band radio transmitters, along with the MAX9636/7/8
low-noise op amps and MAX9060–MAX9064 comparators, can be used as critical
building blocks in occupancy sensors for building security. The MAX9636/7/8 op amps
process the tiny voltages in IR sensors and motion sensors, the MAX9060–MAX9064
comparators complete the alarm circuits, and the MAX1472 and MAX7057 transmitters
send the information over a radio link to a keypad or control center.
These devices are well-suited for low battery-current operation, with shutdown
currents of a microampere or less. The radio transmitters typically draw 10mA during
the short time they are sending information over the air.
Single and multiple occupancy sensor systems can be supported. The MAX1472 operates
at any single frequency in the 300MHz to 450MHz license-free band, determined by an
external crystal. The MAX7057 can be directed by a simple microcontroller to operate at
multiple frequencies using a single crystal. Adding a microprocessor and multiple sensors
can support more than one radio link by changing frequencies.
Benefits
• No need to run wires
◦ Radio link sends alarm indication
◦ 2.1 to 3.6V operation compatible
with most batteries
• Long battery life
◦ 100nA operating current for
comparators
◦ 10nA shutdown current for
transmitters
◦ 1µA shutdown current for op amps
• High sensitivity to small sensor signals
◦ Low bias current and noise density
in op amps
• Wide temperature range
◦ -40°C to +125°C for transmitters
◦ -40°C to +125°C for op amps
◦ -40°C to +125°C for comparators
• Simple or multiple sensors
◦ IR sensor with simple encoder, one
radio frequency
◦ IR, motion, relay sensors with
microcontroller and multiple radio
frequencies
The MAX9638/MAX9064/MAX7057 with multiple remote occupancy sensors.
IR
SENSOR
DATA
2.1V TO 3.6V
EN
ENCODER
ANT
MATCHING
COMPS
MAX9636
OP AMP
MAX1472
RADIO TRANSMITTER
MAX9064
COMPARATOR
IR
SENSOR
MOTION
SENSOR
OPEN/SHUT
RELAY
DATASPI
2.1V TO 3.6V
MICROCONTROLLER
ANT
MATCHING
COMPS
MAX9638
DUAL OP AMP
MAX7057
RADIO TRANSMITTER
MAX9064
COMPARATOR
MAX9064
COMPARATOR
The MAX9636/MAX9064/MAX1472 in a single remote occupancy sensor.