ADV7128KRZ30 ,CMOS 80 MHz, 10-Bit Video DACspecifications T to T unless otherwise noted.)MIN MAXParameter K Version Units Test Conditions/Comm ..
ADV7151LS110 ,CMOS 220 MHz Pseudo-Color Graphics Triple 10-Bit Video RAM-DACspecifications TMIN to uf unless otherwise noted.)
Parameter All Versions Unit Test Conditions/C ..
ADV7151LS170 ,CMOS 220 MHz Pseudo-Color Graphics Triple 10-Bit Video RAM-DACapplications.
The part is controlled and programmed through the micropro-
cessor (MPU) port. The ..
ADV7151LS220 ,CMOS 220 MHz Pseudo-Color Graphics Triple 10-Bit Video RAM-DACAPPLICATIONS
High Resolution Graphics
ADV7151
The ADV7151 (ADV*) is a complete analog output ..
ADV7152LS110 ,CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DACspecifications T to T unless otherwise noted.)L MIN MAXParameter All Versions Unit Test Conditions/ ..
ADV7152LS135 ,CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DACGENERAL DESCRIPTION®Palette Priority Select RegistersThe ADV7152 (ADV ) is a complete analog output ..
AM27C512-120JC , 512 Kilobit ( 64 K x 8-Bit ) CMOS EPROM Speed options as fast as 55 ns
AM27C512-120JC , 512 Kilobit ( 64 K x 8-Bit ) CMOS EPROM Speed options as fast as 55 ns
AM27C512-150DE , 512 Kilobit ( 64 K x 8-Bit ) CMOS EPROM Speed options as fast as 55 ns
AM27C512-150DIB , 512 Kilobit ( 64 K x 8-Bit ) CMOS EPROM Speed options as fast as 55 ns
AM27C512-150JC , 512 Kilobit ( 64 K x 8-Bit ) CMOS EPROM Speed options as fast as 55 ns
AM27C512-150JC , 512 Kilobit ( 64 K x 8-Bit ) CMOS EPROM Speed options as fast as 55 ns
ADV7128KRZ30
CMOS 80 MHz, 10-Bit Video DAC
REV.0
CMOS
80 MHz, 10-Bit Video DAC
FUNCTIONAL BLOCK DIAGRAM
PRODUCT HIGHLIGHTSFast video refresh rate, 80 MHz.Guaranteed monotonic to 10 bits. Ten bits of resolution al-
lows for implementation of linearization functions such as
gamma correction and contrast enhancement.Compatible with a wide variety of high resolution color
graphics systems including RS-343A/RS-170 and the pro-
posed SMPTE 240M standard for HDTV.Combined with a numerically controlled oscillator (AD9955),
it forms a complete frequency synthesizer (DDS).Using the parts reduced power output DAC modes, it is
ideal for power and cost sensitive communications type
applications.
GENERAL DESCRIPTIONThe ADV7128 (ADV) is a video speed, digital-to-analog con-
verter on a single monolithic chip. It consists of a high speed,
10-bit, video D/A converters; a standard TTL input interface;
and a high impedance, analog output, current source.
The ADV7128 has a 10-bit pixel input port. A single +5 V
power supply, an external 1.23 V reference and pixel clock input
are and all that are required to make the part operational.
The ADV7128 is capable of generating video output signals
which are compatible with RS-343A, RS-170 and most pro-
posed production system HDTV video standards, including
SMPTE 240M.
The ADV7128 is fabricated in a +5 V CMOS process. Its
monolithic CMOS construction ensures greater functionality
with low power dissipation. The ADV7128 is available in a 28-
lead small outline IC (SOIC).
ADV is a registered trademark of Analog Devices, Inc.
FEATURES
80 MHz Pipelined Operation
10-Bit D/A Converters
RS-343A/RS-170 Compatible Outputs
TTL Compatible Inputs
+5 V CMOS Monolithic Construction
28-Pin SOIC Package
APPLICATIONS
High Definition Television (HDTV)
High Resolution Color Graphics
Digital Radio Modulation
CAE/CAD/CAM Applications
Image Processing
Instrumentation
Video Signal Reconstruction
Direct Digital Synthesis (DDS) & I/O Modulation
Wireless LAN
Wireless Local Loop
SPEED GRADES
80 MHz
50 MHz
30 MHz
ADV7128–SPECIFICATIONS
(VAA = +5 V 6 5%; VREF = +1.235 V; RL = 37.5 V, CL = 10 pF; RSET = 560 V.
All specifications TMIN to TMAX1 unless otherwise noted.)NOTESTemperature range (TMIN to TMAX); 0°C to +70°C.Sample tested at +25°C to ensure compliance.TTL input values are 0 to 3 volts, with input rise/fall times ≤3 ns, measured between the 10% and 90% points. Timing reference points at 50% for inputs and
outputs. See timing notes in Figure 1.This includes effects due to clock and data feedthrough.
Specifications subject to change without notice.
TIMING CHARACTERISTICS1(VAA = +5 V 6 5%; VREF = +1.235 V; RL = 37.5 V, CL = 10 pF; RSET = 560 V.
All specifications TMIN to TMAX2 unless otherwise noted.)NOTESTTL input values are 0 to 3 volts, with input rise/fall times ≤3 ns, measured between the 10% and 90% points. Timing reference points at 50% for inputs
and outputs. See timing notes in Figure 1.Temperature range (TMIN to TMAX): 0°C to +70°CSample tested at +25°C to ensure compliance.
Specifications subject to change without notice.
Figure 1.Video Input/Output Timing
RECOMMENDED OPERATING CONDITIONS
ORDERING GUIDE*R = SOIC.
ADV7128
ABSOLUTE MAXIMUM RATINGS*VAA to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+7 V
Voltage on Any Digital Pin . . . . . .GND –0.5 V to VAA +0.5 V
Ambient Operating Temperature (TA) . . . . . . . .0°C to +70°C
Storage Temperature (TS) . . . . . . . . . . . . . . .–65°C to +150°C
Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . .+150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . .+300°C
Vapor Phase Soldering (2 minutes) . . . . . . . . . . . . . . .+220°C
IOUT to GND1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 V to VAA
NOTESStresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those listed in the
operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.Analog Output Short Circuit to any Power Supply or Common can be of an
indefinite duration.
PIN CONFIGURATION
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADV7128 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
PIN FUNCTION DESCRIPTION
TERMINOLOGY
Color Video (RGB)This usually refers to the technique of combining the three pri-
mary colors of red, green and blue to produce color pictures
within the usual spectrum. In RGB monitors, three DACs are
required, one for each color.
Gray ScaleThe discrete levels of video signal between reference black and
reference white levels. A 10-bit DAC contains 1024 different
levels, while an 8-bit DAC contains 256.
Raster ScanThe most basic method of sweeping a CRT one line at a time to
generate and display images.
Reference Black LevelThe maximum negative polarity amplitude of the video signal.
Reference White LevelThe maximum positive polarity amplitude of the video signal.
Video SignalThat portion of the composite video signal which varies in gray
scale levels between reference white and reference black. Also
referred to as the picture signal, this is the portion which may be
visually observed.
CIRCUIT DESCRIPTION AND OPERATIONThe ADV7128 contains one 10-bit D/A converter, with one in-
put channel containing a 10-bit register. Also integrated on
board the part is a reference amplifier.
Digital InputsTen bits of data (color information) D0–D9 are latched into the
device on the rising edge of each clock cycle. This data is pre-
sented to the 10-bit DAC and is then converted to an analog
output waveform. See Figure 2.
Figure 2.Video Data Input/Output
All these digital inputs are specified to accept TTL logic levels.
Clock InputThe CLOCK input of the ADV7128 is typically the pixel clock
rate of the system. It is also known as the dot rate. The dot rate,
and hence the required CLOCK frequency, will be determined
by the on-screen resolution, according to the following
equation:
Dot Rate =(Horiz Res) × (Vert Res) × (Refresh Rate)/
(Retrace Factor)
Horiz Res=Number of Pixels/Line.
Vert Res=Number of Lines/Frame.
Refresh Rate=Horizontal Scan Rate. This is the rate at
which the screen must be refreshed, typi-
cally 60 Hz for a noninterlaced system or
30 Hz for an interlaced system.
Retrace Factor=Total Blank Time Factor. This takes into
account that the display is blanked for a
certain fraction of the total duration of
If we, therefore, have a graphics system with a 1024 × 1024
resolution, a noninterlaced 60 Hz refresh rate and a retrace fac-
tor of 0.8, then:
Dot Rate= 1024 × 1024 × 60/0.8
= 78.6 MHz
The required CLOCK frequency is thus 78.6 MHz.
All video data and control inputs are latched into the ADV7128
on the rising edge of CLOCK, as previously described in the
“Digital Inputs” section. It is recommended that the CLOCK
input to the ADV7128 be driven by a TTL buffer (e.g.,
74F244).
Figure 3.IOUT Video Output Waveform
Table I.Video Output Truth Table for the ADV7128NOTETypical with full scale = 17.62 mA. VREF = 1.235 V, RSET = 560 Ω.
ADV7128
Reference InputAn external 1.23 V voltage reference is required to drive the
ADV7128. The AD589 from Analog Devices is an ideal choice
of reference. It is a two-terminal, low cost, temperature com-
pensated bandgap voltage reference which provides a fixed
1.23 V output voltage for input currents between 50 μA and
5 mA. Figure 4 shows a typical reference circuit connection dia-
gram. The voltage reference gets its current drive from the
ADV7128’s VAA through an on-board 1 kΩ resistor to the VREF
pin. A 0.1 μF ceramic capacitor is required between the COMP
pin and VAA. This is necessary so as to provide compensation for
the internal reference amplifier.
A resistance RSET connected between RSET and GND deter-
mines the amplitude of the output video level according to the
following equation:
IOUT (mA) = 7,969 × VREF(V)/RSET(Ω) (1)
Using a variable value of RSET, as shown in Figure 4, allows for
accurate adjustment of the analog output video levels. Use of a
fixed 560 Ω RSET resistor yields the analog output levels as
quoted in the specification page. These values typically corre-
spond to the RS-343A video waveform values as shown in
Figure 3.
Figure 4.Reference Circuit
D/A ConverterThe ADV7128 contains a 10-bit D/A converter. The DAC is
designed using an advanced, high speed, segmented architec-
ture. The bit currents corresponding to each digital input are
routed to either the analog output (bit = “1”) or GND (bit =
“0”) by a sophisticated decoding scheme. The use of identical
current sources in a monolithic design guarantees monotonicity
and low glitch. The on-board operational amplifier stabilizes the
full-scale output current against temperature and power supply
variations.
Analog OutputThe analog output of the ADV7128 is a high impedance current
will develop RS-343A video output voltage levels across a 75 Ω
monitor.
Figure 5a.Analog Output Termination for RS-343A
A suggested method of driving RS-170 video levels into a 75 Ω
monitor is shown in Figure 5b. The output current level of the
DAC remains unchanged, but the source termination resistance,
ZS, on the DAC is increased from 75 Ω to 150 Ω.
Figure 5b.Analog Output Termination for RS-170
More detailed information regarding load terminations for vari-
ous output configurations, including RS-343A and RS-170, is
available in an Application Note entitled “Video Formats & Re-
quired Load Terminations” available from Analog Devices,
publication no. E1228-15-1/89.
Figure 3 shows the video waveforms associated with the current
output driving the doubly terminated 75 Ω load of Figure 5a.
Gray Scale OperationThe ADV7128 can be used for stand-alone, gray scale (mono-
chrome) or composite video applications (i.e., only one channel
used for video information).
Video Output BufferThe ADV7128 is specified to drive transmission line loads,
which is what most monitors are rated as. The analog output
configurations to drive such loads are described in the Analog
Interface section and illustrated in Figure 5. However, in some
applications it may be required to drive long “transmission line”
cable lengths. Cable lengths greater than 10 meters can attenu-
ate and distort high frequency analog output pulses. The inclu-
sion of output buffers will compensate for some cable distortion.
Buffers with large full power bandwidths and gains between 2
and 4 will be required. These buffers will also need to be able to
supply sufficient current over the complete output voltage
swing. Analog Devices produces a range of suitable op amps for
such applications. These include the AD84x series of monolithic
op amps. In very high frequency applications (80 MHz), the
AD9617 is recommended. More information on line driver buff-
ering circuits is given in the relevant op amp data sheets.
