SPT5140
8-BIT, ULTRAHIGH-SPEED D/A CONVERTER
FEATURES
• 400 MWPS nominal conversion rate
• RS-343-A compatible
• Complete video controls: Sync, Blank, Bright
and Reference White (Force High)
• 10 KH, 100K ECL compatible
• Single power supply
• Registered data and video controls
• Differential current outputs
• Stable on-chip bandgap reference
• 50 and 75 ohm output drive
• ESD-protected data and control inputs
APPLICATIONS
• Raster graphics
• High-resolution color or monochrome displays
to 2k x 2k pixels
• 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
GENERAL DESCRIPTION
The SPT5140 is a monolithic 8-bit digital-to-analog con-
verter capable of accepting video data at 400 MWPS.
Complete with video controls — Sync, Blank, Reference
White (Force High), Bright — the SPT5140 directly drives
doubly-terminated 50 or 75 ohm loads to standard com-
posite video levels. Standard set-up level is 7.5 IRE. The
SPT5140 includes an internal precision bandgap refer-
ence which can drive two other SPT5140s in an RGB
graphics system.
The SPT5140 is available in a 24-lead PDIP package in
the industrial temperature range of –25
°C
to +85
°C.
Contact the factory for military temperature and /883
versions.
BLOCK DIAGRAM
Sync, Blank, Bright, Ref – White
Video Controls In
4
Video Data In
D0–D3
4
4
4
Out +
Register
Video Data In
D4–D7
(MSBs)
4
Output
Current
Switches
Out –
4 to 15
Decode
Feedthrough
Convert
2
ISet
Ref In
Ref Out
Ref
Buffer
Bandgap
Reference
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
