DC-VIDEO-TVP5146N Altera, DC-VIDEO-TVP5146N Datasheet - Page 27

• Manufacturer Part Number: DC-VIDEO-TVP5146N
• Description: VIDEO DAUGHTER CARD
• Manufacturer: Altera
• Series: Stratix® IIIr

Specifications of DC-VIDEO-TVP5146N

• Main Purpose: Video, Daughter Card
• Embedded: No
• Utilized Ic / Part: Altera Dev Kits
• Primary Attributes: Dual Composite Video Input - NTSC or PAL
• Secondary Attributes: 10-bit BT.656 Output, Compatible with Expansion Connector, Standard on Most Altera Development Kits
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 544-1704

Altera Corporation
D/A Converters
The Stratix II EP2S180 DSP development board has two D/A converters.
The D/A subsystem of the board has the following features:
■
■
1
The D/A clock signals are output directly from the Stratix II device to the
converters.
Figure 2–5
output of a D/A converter chip, DAC904, consists of a current source
whose maximum value is 20 mA. This differential output is converted to
a single -ended output using an RF transformer. The DSP board uses a 1:1
ratio transformer to interface to a 50 ohm impedance load. Each of the
outputs is terminated with a 49.9 ohm resistor to ground. This circuit
results in outputs being AC-coupled and inherently isolated due to
transformer’s magnetic coupling. The output of the transformer is then
brought to an SMA connector.
Figure 2–5. On-Board Circuitry after D/A Converter
1
The converters produce 14-bit samples at a maximum rate of 165
MSPS.
The analog output from each D/A converter is single-ended.
The D/A converters expect data in an unsigned integer format.
The development kit includes an SLP-50 anti-aliasing filter from
Mini-Circuits. This filter provides a 55-MHz cut-off frequency.
For systems with other bandwidth requirements, a variety of
anti-aliasing filters are available from commercial
manufacturers that suit system requirements.
shows the on-board circuitry after a D/A converter. The
Stratix II EP2S180 DSP Development Board Reference Manual
Core Version a.b.c variable
Board Components & Interfaces
2–19