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TMC2069P7C
Demonstration Board for the TMC3003 DAC
Features
• Parallel TTL Compatible Inputs
• Component and VGA Outputs
• Fairchild demo board compatibility
Description
The TMC2069P7C DAC demonstration board provides a
flexible base for evaluating the performance of the
TMC3003 triple 10 bit DAC.
The board can output analog component video or VGA.
There are high quality Hybrid filters (601-003) on the output.
Applications
•
•
•
•
Evaluation of TMC3003 DAC
Output for TMC2068P7C Decoder demo board
Output for Genesis 10-bit Line doubler board
System Breadboarding
Preliminary Information
Block Diagram
Analog RGB
VGA Output
+5V 0V -5V
96 Way
Edge
Connector
(female)
Digital Inputs:
10 bit G/Y
10 bit B/U
10 bit R/V
DAC Clock
SYNC
BLANK
TMC3003
1
High Quality
LPF
High Quality
LPF
High Quality
LPF
Analog RGB/YPbPr
Video Output
32
Analog Outputs for the TMC22153 Digital Decoder
Rev. 0.9.1
PRELIMINARY INFORMATION
describes products that are not in full production at the time of printing. Specifications are based on design goals
and limited characterization. They may change without notice. Contact Fairchild Semiconductor for current information.
TMC2069P7C
PRODUCT SPECIFICATION
Functional Description
The TMC2069P7C is designed to demonstrate the perfor-
mance of the TMC3003 Digital to Analog converter. It also
offers an example of design practices that result in high-
quality video performance.
The TMC3003 is a high-speed triple 10-bit D/A converter
especially suited for video and graphics applications.
It offers 10-bit resolution, TTL-compatible inputs, low
power consumption, and requires only a single +5 Volt
power supply. It has single ended current output, SYNC and
BLANK control inputs, and a separate current source for
adding sync pulses to the Green D/A converter output. It is
ideal for generating analog RGB from digital RGB and
driving computer display and video monitors. Three speed
grades are available: 30, 50, and 80 Msps.
The DAC module can be plugged into the TMC2068P7C
decoder demonstration board to provide analog RGB or
YPbPr outputs for viewing the decoder performance. The
board can also be plugged into the 10-bit DICE line doubler
demonstration board from Genesis. The input for the
Genesis 10 bit line doubler board is being provided by the
TMC2067P7C 10 bit ADC demonstration board connected
to the TMC2068P7C decoder demonstration board.
A set of switches routes the triple DAC outputs to either the
VGA connector or the component video connectors. The
SYNC and BLANK signals to the triple DAC are required
for the VGA mode are disabled when the component video
output is required. The component video connectors provide
sync on green.
Setup Procedure
1.
To set up the output levels on the triple dac, place a digi-
tal NTSC unmodulated ramp that has peak white at the
digital level 824 and blanking at 240.
The output analog levels should be 286 mV sync tip to
blank level and 1.0V sync tip to peak white. If the output
levels are incorrect, adjust the GREEN output using the
potentiometer RV1.
Apply either the unmodulated digital ramp used in step
1 to the red and blue inputs to adjust the Pb/BLUE and
Pr/RED outputs or apply SMPTE color bars and mea-
sure the Pb and Pr outputs.
Adjust RV2, to adjust the RED, and RV3, to adjust the
BLUE output.
a.
b.
If using the unmodulated ramp, match the output
voltage levels to the values on the green channel.
If using the SMPTE color bars, the level of Pb and
Pr peak to peak should be 525 mV.
2.
3.
Preliminary Information
4.
1.0V
286 mV
Figure 2. Unmodulated Ramp Waveform
Pass Band
0 dB
0 dB
Stop Band
With 13.5 MHz SinX/X Roll-off
0.25 dB/Div
With 13.5MHz SinX/X Roll-off
-2.0 dB
0 MHz
6 MHz
-50 dB
0 MHz
10 MHz
100 MHz
2T Pulse
475 nSec
Group Delay
20 nSec/Div
HAD=200 nSec
375 nSec
0 MHz
6 MHz
Figure 1. Output Low Pass Filters
2
PRODUCT SPECIFICATION
TMC2069P7C
Power Supply Requirements
The TMC2069P7C board requires 1.5 Amps from the +5
Volt power supply and 0.5 Amps from the -5 Volt power sup-
ply. The -5 Volt power supply powers the SMA filters. The
+5 Volt power supply not only drives TTL logic devices but
it also provides the power and voltage references to the
TMC3003. Therefore, it is recommended that a bench power
supply be used with the cable lengths kept to a minimum.
The response at 5.0MHz typically varies<
±
0.25dB with
supplies of
±
5V to
±
8V. When operating in the 0dB gain
mode, pin 6 must be well isolated from ground planes. When
operating in the +6dB gain mode, pin 6 must have a low
resistance path to ground.
For more information please contact Microelectronic
Module Corporation (MMC) at 414-785-6506.
Output Low-Pass Filters
The 601-003 filters are high end broadcast quality
filters. They are Virtual 601 post filters with a bandwidth of
5.75MHz. 5-pole, sharp cutoff, Elliptic response, with 3
sections of group delay equalization. These filters were
designed for SinX/X compensated CCIR 601 luminance
applications and make an excellent post-filter following a
D/A converter.
Preliminary Information
3
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