Information

132 | Signal Chain Guide 2013 Texas Instruments
Interface
Other Line Circuit
Get more information: www.ti.com/product/SN65HVD62
AISG On-Off Keying Coax Modem Transceiver
SN65HVD62
This transceiver modulates and demodulates signals between the logic (baseband)
and a frequency suitable for long coaxial media and is designed to be compliant with
Antenna Interface Standards Group v2.0 specification.
The HVD62 receiver integrates an active bandpass filter to enable demodulation of
signals even in the presence of spurious frequency components. The filter has a 2.176
MHz center frequency.
The transmitter supports adjustable output power levels varying from +0 dBm to
+6
dBmdeliveredtothe50Ωcoaxcable.TheHVD62transmitteriscompliantwiththe
spectrum emission requirement provided by the AISG standard.
A direction control output is provided which facilitates bus arbitration for an RS-485
interface. These devices integrate an oscillator input for a crystal, and also accept
standard clock inputs to the oscillator.
SN65HVS885 functional block diagram
Key Features
• Supplyrangingfrom3Vto5.5V
• Independentlogicsupplyof1.6Vto
5.5 V
• Wideinputdynamicrangeof–15dBm
to +5 dBm for receiver
• Powerdeliveredbythedrivertothe
coax can be adjusted from 0 dBm to
+6 dBm
• AISGcompliantoutputemissionprofile
• Low-powerstandbymode
• DirectioncontroloutputforRS-485
bus arbitration
•
Supportsupto115kbpssignaling
• Integratedactivebandpassfilterwith
center frequency at 2.176 MHz
• 3mm×3mm16-PinQFNPackage
Applications
• AISG–interfaceforantennaline
devices
• Towermountedamplifiers(TMA)
• Generalmodeminterfaces
XTAL
Buffer
OUTPUT
STAGE
Buffer
OOK
DEMOD
RES
XTAL1
TXIN
RXOUT
TXOUT
V
L
GND
Buffer
OOK
MOD
PREAMP
FILTER
Control
Logic
COMP
2.176
FILTER
2.176
SYNCOUT
RXIN
DIR
DIRSET1
RECEIVER
THRESHOLD
14
15
2
7
6
5
4
16
11
3
12
9
1
13
8
10
BIAS
GND
Vcc
XTAL2
DIRSET2
AISG Modem Transceiver
Device Description Standard
Supply
Voltage
(V)
Independent
Logic Supply (V)
Carrier
Frequency
(MHz)
Datarate
(kbps)
Max Supply
Current
(mA)
Low Power
Standby
Mode
Auto
Direction
Output
HiRel
Avail. Package Price*
SN65HVD62
On-Off Keying Coax
Modem Transceiver
AISG 3 to 5.5 1.6 to 5.5 2.176 115 33 Yes Yes N QFN-16 2.00
*Suggested resale price in U.S. dollars in quantities of 1,000. See www.ti.com/hirel for HiRel options.
SN65HVD62 functional block diagram