• Compatible with TDC1018 and HDAC10180
with Improved Performance
• RS-343-A Compatible
• Complete Video Controls: Sync, Blank, Bright
and Reference White (Force High)
• 10KH, 100K ECL Compatible
• Single Power Supply
• Registered Data and Video Controls
• Differential Current Outputs
• ESD Protected Data and Control Inputs
GENERAL DESCRIPTION
The SPT1018 is a monolithic 8-bit digital-to-analog converter
capable of accepting video data at a 165 or 275 MWPS rate.
Complete with video controls (Sync, Blank, Reference White
[Force High], Bright), the SPT1018 directly drives doublyterminated 50 or 75 ohm loads to standard composite video
levels. The standard set-up level is 7.5 IRE. The SPT1018 is
pin-compatible with the HDAC10180 and the TDC1018, with
APPLICATIONS
• High Resolution Color or Monochrome Raster
Graphics Displays
• Medical Electronics: CAT, PET, MR Imaging Displays
• CAD/CAE Workstations
• Solids Modeling
• General Purpose High-Speed D/A Conversion
• Digital Synthesizers
• Automated Test Equipment
• Digital Transmitters/Modulators
improved performance. The SPT1018 contains data and
control input registers, video control logic, reference buffer,
and current switches.
The SPT1018 is available in a 24-lead PDIP package in the
industrial temperature range. Contact the factory for military
temperature and /883 versions.
BLOCK DIAGRAM
Video Controls In
Video Data In
Video Data In
Feedthrough
Signal Processing Technologies, Inc.
Convert
Ref+
Ref-
Sync, Blank, Bright, Ref - High
D0 - D3
D4 - D7
(MSBs)
4
4
Register
4 To 15
Decode
4
2
Ref
Buffer
4
4
Output
Current
Switches
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300 FAX: (719) 528-2370
Out +
Out -
Comp
ABSOLUTE MAXIMUM RATING (Beyond which damage may occur)
1
Supply Voltages
VEE (measured to VCC) ............................... -7.0 to 0.5 V
Input Voltages
CONV, Data, and Controls .......................... VEE to 0.5 V
(measured to VCC)
Temperature
Operating,ambient ................................-25 to +85 °C
junction......................................... +175 °C
Lead, Soldering (10 seconds)............................. +300 °C
Storage .....................................................-60 to +150 °C
Ref+ (measured to VCC) ..............................VEE to 0.5 V
Ref- (measured to VCC)............................... VEE to 0.5 V
Note: 1. Operation at any Absolute Maximum Ratings is not implied. See Electrical Specifications for proper nominal applied
conditions in typical applications.
ELECTRICAL SPECIFICATIONS
VCC =ground, VEE = -5.2 V ±0.3 V, TA =T
PARAMETERSCONDITIONSLEVELMINTYPMAXUNITS
DC ELECTRICAL CHARACTERISTICS
Integral Linearity Error1.0 mA<I
Differential Linearity Error1.0 mA<I
Gain ErrorVI-6.5+6.5% Full Scale
Gain Error TempcoV150PPM/°C
Input Capacitance, REF+, REF-V5pF
Compliance Voltage, +OutputVI-1.21.5V
Compliance Voltage, -OutputVI-1.21.5V
Equivalent Output ResistanceVI20kΩ
Output CapacitanceV12pF
Maximum Current, + OutputIV45mA
Maximum Current, - OutputIV45mA
Output Offset CurrentVI0.050.5LSB
Input Voltage, Logic HIGHVI-1.0V
Input Voltage, Logic LOWVI-1.5V
Convert Voltage,IV-0.5-2.5V
Common Mode Range (V
Convert Voltage, Differential (V
Input Current, Logic LOW,VI35120µA
Data and Controls
Input Current, Logic HIGH,VI40120µA
Data and Controls
Input Current, ConvertVI260µA
ICM
IDF
to T
MIN
)
)IV0.41.2V
, CC = 0 pF, I
MAX
TESTTEST
<1.3 mAVI-.37+.37% Full Scale
Set
<1.3 mAVI-0.2+0.2% Full Scale
Set
= 1.105 mA, unless otherwise specified.
Set
-.95+.95LSB
-0.5+0.5LSB
SPT
SPT1018
25/14/97
ELECTRICAL SPECIFICATIONS
VCC =ground, VEE = -5.2 V ±0.3 V, TA =T
PARAMETERSCONDITIONSLEVELMINTYPMAXUNITS
MIN
to T
TEST
, CC = 0 pF, I
MAX
= 1.105 mA, unless otherwise specified.
Set
DC ELECTRICAL CHARACTERISTICS
Input Capacitance,V3.0pF
Data and Controls
Power Supply SensitivityVI-12020+120µA/V
Supply CurrentVI155220mA
DYNAMIC CHARACTERISTICS (R
Maximum Conversion RateB GradeIV165MWPS
Rise Time10% to 90% G.S.IV1.6ns
Rise Time10% to 90% G.S.V1.0ns
Current Settling Time, Clocked ModeTo 0.2% G.S.V7.0ns
Current Settling Time, Clocked ModeTo 0.8% G.S.V5.5ns
Current Settling Time, Clocked ModeTo 0.2% G.S.V4.5ns
t
SI
Clock to Output Delay, Clocked ModeIV2.24.0ns
t
DSC
Data to Output Delay,IV3.26.0ns
Transparent Mode t
Convert Pulse Width, ( Low or High)B GradeIV3.0ns
t
, t
PWL
PWH
Glitch EnergyArea = 1/2 VTV4pV-s
Reference Bandwidth, -3 dBV1.0MHz
Set-up Time, Data and ControlsIV1.0ns
t
S
Hold Time, Data and ControlsIV0.5ns
t
H
Slew Rate20% to 80% G.S.IV390V/µS
Clock FeedthroughIV-48dB
DST
= 37.5 ohms, CL = 5 pF, TA = 25 °C, I
L
A GradeIV275MWPS
TA = T
RL = 25 ohms
RL = 25 Ω
TA = T
TA = T
A GradeIV1.8ns
TA = T
TA = T
TA = T
TA = T
MIN
MIN
MIN
MIN
MIN
MIN
MIN
to T
to T
to T
to T
to T
to T
to T
MAX
MAX
MAX
MAX
MAX
MAX
MAX
= 1.105 mA)
Set
IV2.0ns
IV4.5ns
IV6.0ns
IV1.0ns
IV0.5ns
IV325V/µS
IV-48dB
TEST LEVEL CODES
All electrical characteristics are subject to the
following conditions: All parameters having min/
max specifications are guaranteed. The Test
Level column indicates the specific device testing actually performed during production and
Quality Assurance inspection. Any blank section in the data column indicates that the specification is not tested at the specified condition.
SPT
TEST LEVEL
I
II
III
IV
V
VI
35/14/97
TEST PROCEDURE
100% production tested at the specified temperature.
100% production tested at TA = +25 °C, and sample
tested at the specified temperatures.
QA sample tested only at the specified temperatures.
Parameter is guaranteed (but not tested) by design
and characterization data.
Parameter is a typical value for information purposes
only.
100% production tested at TA = +25 °C. Parameter is
guaranteed over specified temperature range.
SPT1018
Figure 1 - Functional Diagram
D0 - D7
Composite
Video Controls
CONV
CONV
Feedthrough
8
4
2
V
EE
Decoding
Logic
V
CCRef-
APPLICATION INFORMATION
The SPT1018 is a high speed video digital-to-analog converter capable of conversion rates of up to 275 MWPS. This
makes the device suitable for driving 1500 X 1800 pixel
displays at 70 to 90 Hz update rates.
The SPT1018 is separated into different conversion rate
categories as shown in table I.
The SPT1018 has 10 KH and 100K ECL logic level compatible video controls and data inputs. The complementary
analog output currents produced by the devices are proportional to the product of the digital control and data inputs in
conjunction with the analog reference current. The SPT1018
is segmented so that the four MSBs of the input data are
separated into a parallel thermometer code. From here,
Current
Sources
And
Switches
Data
Registers
Current
Source
Biasing
Amp
+-
Ref+
Out +
Out -
fifteen identical current sinks are driven to fabricate sixteen
coarse output levels. The remaining four LSBs drive four
binary weighted current switches.
The MSB currents are then summed with the LSBs, which
provide a one-sixteenth of full scale contribution, to provide
the 256 distinct analog output levels.
The video control inputs drive weighted current sinks that are
added to the output current to produce composite video
output levels. These controls, Sync, Blank, Reference White
(Force High), and Bright are needed in video applications.
Another feature that similar video D/A converters do not have
is the Feedthrough Control. This pin allows registered or
unregistered operation of the video control and data inputs.
In the registered mode, the composite functions are latched
to the pixel data to prevent screen-edge distortions generally
found on unregistered video DACs.
Table I - The SPT1018 Family and Speed Designations
PART NUMBERUPDATECOMMENTS
SPT1018A275 MWPSSuitable for 1200 X 1500 to 1500 X 1800
SPT1018B165 MWPSSuitable for 1024 X 1280 to 1200 X 1500
SPT
displays at 60 to 90 Hz update rate.
displays at 60 to 90 Hz update rate.
SPT1018
45/14/97
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