Rainbow Electronics MAX9947 - Manual

_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
AISG Integrated Transceiver
MAX9947
General Description
The MAX9947 is an AISG-compliant, fully integrated
transceiver.
The MAX9947 receiver offers a typical dynamic range of
20dB and integrates a bandpass filter that operates in the
2.176MHz frequency with a narrow 200kHz bandwidth.
The MAX9947 transmitter integrates a bandpass filter
that is compliant with the AISG spectrum emission pro-
file. It can modulate OOK signals up to 115.2kbps. The
output power can be varied with external resistors from
+7dBm to +12dBm to compensate for loss in the external
circuitry and cabling.
The MAX9947 also features a direction output to facilitate
the RS-485 bus arbitration in tower-mounted equipment.
The MAX9947 is available in a small, 3mm x 3mm 16-pin
TQFN and is rated for operation in the -40°C to +85°C
temperature range.
Applications
Base Stations
Tower Equipment
Features
S
Receiver Wide Input Dynamic Range
-15dBm to +5dBm in 50I
S Variable Transmitter Output Level from +7dBm to
+12dBm
S AISG-Compliant Output Emission Profile
S Autodirection Output
S No Need of Microcontrollers to Handle Bus
Arbitration in Tower-Mounted Equipment
S
Supports All AISG Data Rates
9.6kbps
38.4kbps
115.2kbps
S
Bandpass Filter Compliant with AISG Protocol
Centered Around 2.176MHz
S 3.0V to 5.5V Voltage Supply
S Independent Logic Supply
S Small, 3mm x 3mm 16-Pin TQFN Package
19-5029; Rev 0; 12/09
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad. Connect EP to GND to enhance thermal
dissipation.
Functional Diagram
PART
TEMP
RANGE
PIN-PACKAGE
TOP
MARK
MAX9947ETE+
-40NC to
+85NC
16 Thin QFN-EP* AFH
MAX9947
BANDPASS FILTER
RXIN
SYNCOUT
TXOUT
1.5V
REF
-15dBm
BANDPASS FILTER
+7dBm TO +12dBm
RES BIAS
OOK
DEMODULATOR
DIRECTION
DETECTION
STATE MACHINE
ANALOG
SWITCH
GND
RXOUT
DIR
DIRMD2
DIRMD1
TXIN
XTAL2
XTAL1
V CC
V L
ABRIDGED