SPT5140

8-BIT, ULTRAHIGH-SPEED D/A CONVERTER

BLOCK DIAGRAM

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

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

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.

Sync, Blank, Bright, Ref – White

D0–D3

D4–D7

(MSBs)

4 to 15

Decode

Output

Current

Switches

Out +

Out –

Bandgap

Reference

Video Controls In

Video Data In

Feedthrough

Convert

Ref In

Ref Out

ISet

Video Data In

4

4

4

4

2

4

Ref

Buffer

Register