NXP AISG Transceivers
ASC3011, ASC3012
AISG transceivers with tunable
dynamic range and multiple carriers
The NXP ASC3011 and ASC3012 AISG transceiver products are highly integrated DSP based AISG
modems with software programmable parameters that can be used on tower mounted devices or
base-stations. These devices are optimized for a very low external component count. The receiver
sensitivity and transmitter output power have a high dynamic range, preprogrammed to conform
to the AISG standard or tunable to higher levels according to application requirements.
Key features
`
Two independent AISG modems in small package
`
Low component count and small application size
`
Receiver band-pass filter and transmitter emission profile
compliant with AISG standard
`
Supports 2.176 MHz, 4.352 MHz and 6.528 MHz
`
Advanced DSP-based modem
`
Receiver sensitivity better than AISG standard to
compensate for external circuit attenuation
`
Three programmable receiver sensitivity levels: AISG
standard, high and ultra high
`
Programmable transmitter cable power of 0 dBm to +10 dBm
`
Supports 9.6 kbps and 38.4 kbps AISG OOK data rates
`
Integrated 50
Ω
termination for receiver and transmitter
signals
`
5 V tolerant IO
`
1.8 V and 3.3 V power supply
`
9 x 9 mm HVQFN-64 pin package
Key benefits
`
Combines two AISG transceivers in single 9 x 9 mm package
`
Highly integrated solution:
- Cost effective
- Low component count
- Small size
- Low power
Interfaces supported
`
I
2
C master/slave:
- Configurable I
2
C address selection for connecting four
ASC3011/12 devices on the same I
2
C lines
`
UART/RS-485
Description
The programmable ASC3011 (single modem) and ASC3012
(dual modem) AISG transceivers with programmable carrier
frequency are highly optimized, cost efficient and flexible
solutions for AISG communication between base stations and
tower mounted devices.
The products can be used in base station controllers as well
as in tower mounted devices. With two independently tunable
AISG modems in a single package, the ASC3012 product is a
very cost and size optimized solution.
By the two/three wire interface the products can communicate
with the UART of a microcontroller or an RS-485 transceiver.
The parameters of each modem can be independently
programmed using the I
2
C interface. The products conform to
the AISG standard.
In addition to the default AISG carrier frequency of 2.176 MHz,
the products also support 4.352 MHz, and 6.528 MHz carrier
frequencies to support channel multiplexing of two or three
carriers on the same RF feeder cable.
The receiver is programmable to three different sensitivity
levels depending on the application requirements. The
receiver band-pass filter is AISG compliant and guarantees
excellent performance at low signal strength even with
presence of co-channels.
Development platform
Some modem parameters of the ASC3011 and ASC3012 AISG
transceivers are programmable, like receiver sensitivity and
output power. NXP provides a Software Development Kit
(SDK) with tools to set such modem parameters. NXP provides
also AISG Layer-2 and Layer-7 reference software for an
external microcontroller to interface with the RS-485/UART of
the ASC3011/12 devices. The same reference software can be
used also for the NXP AISG transceivers with embedded ARM
®
Cortex™-M3 CPU — ASC3101 single modem transceiver and
ASC3112 dual modem transceiver.
Using the NXP AISG reference protocol stack will enable base
station and tower mounted device manufacturers to build AISG
compliant products with guaranteed interoperability between
products of different device manufacturers using NXP’s AISG
transceiver products.
Block diagram of typical RET system
Integrated ANT
Application block diagram
Interface of RS-485 transceiver with ASC3011/12
TX
RS-485 Interface
TRANSCEIVER
TXI
DIR
RXO
aisg_rx(RXI)
aisg_tx(TXO)
To RF cable
ANT
RS-485
RE/DE
RX
ASC3011/12
1/2 MODEM
RF FILTER
RET
RF
AISG (RS-485) + DC
MODEM
PROGRAMMING
INTERFACE
To Microcontroller
I
2
C
ANT
Interface of microcontroller with ASC3011/12
TX
RX
UART
MICROCONTROLLER
RTS
I
2
C
TXI
RXO
DIR
aisg_rx(RXI)
aisg_tx(TXO)
To RF cable
TRANSCEIVER
UART
RS485
To daisy
chaining
Power
supply
POWER
ASC3011/12
1/2 MODEM
RF FILTER
ASC3011
RF
Smart
bias T
RET
AISG (OOK)
AISG (RS-485) + DC
RF + OOK + DC
RF feeder
cable
DC-bias T
MODEM
PROGRAMMING
INTERFACE
DC
AISG (OOK) + DC
RF
SEPARATOR
RF + AISG (OOK) + DC
Part numbers
Part number
ASC3011
ASC3012
Description
Single AISG modem (64 pin)
Dual AISG modem (64 pin)
™
Antenna Interface Standards Group
www.nxp.com
© 2013 NXP Semiconductors N.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The
information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and
may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof
does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Date of release: March 2013
Document order number: 9397 750 17403
Printed in the Netherlands
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