SPT SPT1018AIN, SPT1018BIN Datasheet

SPT1018

8-BIT, HIGH SPEED D/A CONVERTER

FEATURES

• 275 MWPS Conversion Rate - Version A

• 165 MWPS Conversion Rate - Version B

• 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

Feedthrough

Signal Processing Technologies, Inc.

Convert

Ref+

Ref-

Sync, Blank, Bright, Ref - High

D0 - D3

D4 - D7

(MSBs)

4 To 15

Decode

Ref

Buffer

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)

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

PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS

DC ELECTRICAL CHARACTERISTICS

Integral Linearity Error 1.0 mA<I

Differential Linearity Error 1.0 mA<I

Gain Error VI -6.5 +6.5 % Full Scale Gain Error Tempco V 150 PPM/°C Input Capacitance, REF+, REF- V 5 pF Compliance Voltage, +Output VI -1.2 1.5 V Compliance Voltage, -Output VI -1.2 1.5 V Equivalent Output Resistance VI 20 kΩ Output Capacitance V 12 pF Maximum Current, + Output IV 45 mA Maximum Current, - Output IV 45 mA Output Offset Current VI 0.05 0.5 LSB Input Voltage, Logic HIGH VI -1.0 V Input Voltage, Logic LOW VI -1.5 V Convert Voltage, IV -0.5 -2.5 V

Common Mode Range (V Convert Voltage, Differential (V Input Current, Logic LOW, VI 35 120 µA

Data and Controls Input Current, Logic HIGH, VI 40 120 µA

Data and Controls Input Current, Convert VI 2 60 µA

ICM

IDF

to T

MIN

)

) IV 0.4 1.2 V

, CC = 0 pF, I

MAX

TEST TEST

<1.3 mA VI -.37 +.37 % Full Scale

Set

<1.3 mA VI -0.2 +0.2 % Full Scale

Set

= 1.105 mA, unless otherwise specified.

Set

-.95 +.95 LSB

-0.5 +0.5 LSB

SPT

SPT1018

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ELECTRICAL SPECIFICATIONS

VCC =ground, VEE = -5.2 V ±0.3 V, TA =T

PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS

MIN

to T

TEST

, CC = 0 pF, I

MAX

= 1.105 mA, unless otherwise specified.

Set

DC ELECTRICAL CHARACTERISTICS

Input Capacitance, V 3.0 pF Data and Controls Power Supply Sensitivity VI -120 20 +120 µA/V Supply Current VI 155 220 mA

DYNAMIC CHARACTERISTICS (R

Maximum Conversion Rate B Grade IV 165 MWPS

Rise Time 10% to 90% G.S. IV 1.6 ns

Rise Time 10% to 90% G.S. V 1.0 ns

Current Settling Time, Clocked Mode To 0.2% G.S. V 7.0 ns Current Settling Time, Clocked Mode To 0.8% G.S. V 5.5 ns Current Settling Time, Clocked Mode To 0.2% G.S. V 4.5 ns

Clock to Output Delay, Clocked Mode IV 2.2 4.0 ns

DSC

Data to Output Delay, IV 3.2 6.0 ns Transparent Mode t Convert Pulse Width, ( Low or High) B Grade IV 3.0 ns

, t

PWL

PWH

Glitch Energy Area = 1/2 VT V 4 pV-s Reference Bandwidth, -3 dB V 1.0 MHz Set-up Time, Data and Controls IV 1.0 ns

Hold Time, Data and Controls IV 0.5 ns

Slew Rate 20% to 80% G.S. IV 390 V/µS

Clock Feedthrough IV -48 dB

DST

= 37.5 ohms, CL = 5 pF, TA = 25 °C, I

A Grade IV 275 MWPS

TA = T

RL = 25 ohms

RL = 25 Ω

TA = T

A Grade IV 1.8 ns

TA = T

MIN

to T

MAX

= 1.105 mA)

Set

IV 2.0 ns

IV 4.5 ns

IV 6.0 ns

IV 1.0 ns

IV 0.5 ns

IV 325 V/µS

IV -48 dB

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

III IV

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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

Decoding

Logic

CC Ref-

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 NUMBER UPDATE COMMENTS

SPT1018A 275 MWPS Suitable for 1200 X 1500 to 1500 X 1800

SPT1018B 165 MWPS Suitable for 1024 X 1280 to 1200 X 1500

SPT

displays at 60 to 90 Hz update rate.

SPT1018

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