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PDF SPT1018 Data sheet ( Hoja de datos )
| Número de pieza | SPT1018 | |
| Descripción | HIGH SPEED D/A CONVERTER | |
| Fabricantes | SPT | |
| Logotipo |  |
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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
SPT1018
8-BIT, HIGH SPEED D/A CONVERTER
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
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 doubly-
terminated 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
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
Sync, Blank, Bright, Ref - High
D0 - D3
4
4
Video Data In
D4 - D7
(MSBs)
4
4 To 15
Decode
Feedthrough
Convert
2
Register
4
4
Ref+
Ref-
Ref
Buffer
Output
Current
Switches
Out +
Out -
Comp
Signal Processing Technologies, Inc.
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300 FAX: (719) 528-2370
1 page  
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Figure 2 - Typical Interface Circuit
Video
Control
Inputs
FT
FH
Blank
BRT
Sync
Video
Data
Inputs
D0 (LSB)
D1
D2
D3
D4
D5
D6
D7 (MSB)
R1
500 Ω
Clock
R2
750 Ω
CONV
CONV
ISet
LM113/313
1 kΩ
2 kΩ
V+ ( ISet * )
V-
.01 µF
– 5.2 V
FB
4
4
4 To 15
Decode
Ref+
Ref
Buffer
Ref-
VCC
.01 µF
10 µF
VEE
-5.2 V
Out-
R3
50/75 Ω
Out+
Video Monitor
50/75 Ω COAX
R4
50/75 Ω
NOTES:
1. V- = -1.2 V (typical) for LM113.
2. V+ = -1.2 V
3.
ISet
=
V+
αT(R 1+R
2)
4. RL = R3 / / R4
5.
VOut-
= K 255-Digital
Input
255
Code
x I Set
RL
+ [KI
x
I
Set
x RL (Bright)]
6. VSync = (K x ISet x RL) + (K2 x ISet x RL)
K = 15.8069
COMP
K1 = 1.7617
K2 = 10.0392
7. FB = Ferrite bead, Fair-rite P/N 217430011 or equivalent.
8. All reference resistors 1/8 W 1% metal film
power supply decoupling 50 V ceramic disc.
9. x = ECL Termination
10. = VCC = AGND
11. See figure 8 for detail on Ref Buffer.
10. = DGND (digital input drivers).
TYPICAL INTERFACE CIRCUIT
GENERAL
A typical interface circuit using the SPT1018 in a color raster
application is shown in figure 2. The SPT1018 requires few
external components and is extremely easy to use. The very
high operating speeds of the SPT1018 require good circuit
layout, decoupling of supplies, and proper design of trans-
mission lines. The following considerations should be noted
to achieve best performance.
INPUT CONSIDERATIONS
Video input data and controls may be directly connected to
the SPT1018. Note that all ECL inputs are terminated as
closely to the device as possible to reduce ringing, crosstalk
and reflections. A convenient and commonly used microstrip
impedance is about 130 ohms, which is easily terminated
using a 330 ohm resistor to VEE and a 220 ohm resistor to
Ground. This arrangement gives a Thevenin equivalent ter-
mination of 130 ohms to -2 volts without the need for a
-2 volt supply. Standard SIP (Single Inline Package) 220/330
resistor networks are available for this purpose. It is recom-
mended that stripline or microstrip techniques be used for all
ECL interface. Printed circuit wiring of known impedance
over a solid ground plane is recommended.
OUTPUT CONSIDERATIONS
The analog outputs are designed to directly drive a dual 50 or
75 ohm load transmission system as shown. The source
impedances of the SPT1018 outputs are high impedance
current sinks. The load impedance (RL) must be 25
or 37.5 ohms to attain standard RS-343-A video levels. Any
deviation from this impedance will affect the resulting video
output levels proportionally. As with the data interface, it is
important that the analog transmission lines have matched
impedance throughout, including connectors and transitions
between printed wiring and coaxial cable. The combination of
matched source termination resistor RS and load terminator
RL minimizes reflections of both forward and reverse travel-
ing waves in the analog transmission system. The return path
for analog output current is VCC which is connected to the
source termination resistor RS.
SPT
5
SPT1018
5/14/97
5 Page 
www.DataSheet4U.com
PIN ASSIGNMENTS
D3 1
D2 2
D1 3
D0 4
VEE 5
CONV 6
CONV 7
FT 8
VCC 9
FH 10
Blank 11
BRT 12
PDIP
24 D4
23 D5
22 D6
21 D7
20 VEE
19 Out +
18 Out -
17 VCC
16 Comp
15 Ref+
14 Ref-
13 Sync
PIN FUNCTIONS
Name
D3
D2
D1
D0
VEE
CONV
Function
Data Bit 3
Data Bit 2
Data Bit 1
Data Bit 0 (LSB)
Negative Supply
Convert Clock Input
CONV
FT
VCC
FH
Blank
BRT
Sync
Ref-
Ref+
COMP
Out-
Out+
D7
D6
D5
D4
Convert Clock Input Complement
Register Feedthrough Control
Positive Supply
Data Force High Control
Video Blank Input
Video Bright Input
Video Sync Input
Reference Current - Input
Reference Current + Input
Compensation Input
Output Current Negative
Output Current Positive
Data Bit 7 (MSB)
Data Bit 6
Data Bit 5
Data Bit 4
ORDERING INFORMATION
PART NUMBER
DESCRIPTION
SPT1018AIN
8-BIT, 275 MWPS DAC
SPT1018BIN
8-BIT, 165 MWPS DAC
TEMPERATURE RANGE
-25 to +85 °C
-25 to +85 °C
PACKAGE
24L PDIP
24L PDIP
Signal Processing Technologies, Inc. reserves the right to change products and specifications without notice. Permission is hereby expressly
granted to copy this literature for informational purposes only. Copying this material for any other use is strictly prohibited.
WARNING - LIFE SUPPORT APPLICATIONS POLICY - SPT products should not be used within Life Support Systems without the specific
written consent of SPT. A Life Support System is a product or system intended to support or sustain life which, if it fails, can be reasonably
expected to result in significant personal injury or death.
Signal Processing Technologies believes that ultrasonic cleaning of its products may damage the wire bonding, leading to device
failure. It is therefore not recommended, and exposure of a device to such a process will void the product warranty.
SPT
11
SPT1018
5/14/97
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SPT1018.PDF ] | |
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