19-1204; Rev 0; 3/97
8-Bit, High-Speed DAC
_______________General Description
The MAX5018 is a monolithic, 8-bit digital-to-analog
converter (DAC) capable of accepting video data at
165Msps or 275Msps. Complete with video controls
(sync, blank, reference white (force high), and bright),
the MAX5018 directly drives doubly terminated 50Ω or
75Ω loads to standard composite video levels.
Standard setup level is 7.5IRE. The MAX5018 is pin
compatible with the HDAC10180 and the TDC1018,
with improved performance. The MAX5018 contains
data and control input registers, video control logic, ref-
erence buffer, and current switches.
Two performance grades of the MAX5018 are available.
Both are packaged in a 24-pin PDIP in the -20°C to
+85°C industrial temperature range.
____________________________Features
o
275Msps Conversion Rate (MAX5018A)
165Msps Conversion Rate (MAX5018B)
o
TDC1018 and HDAC10180 Compatible with
Improved Performance
o
RS-343-A Compatible
o
Complete Video Controls: Sync, Blank, Bright,
and Reference White (force high)
o
ECL Compatible
o
Single Power Supply
o
Registered Data and Video Controls
o
Differential Current Outputs
o
ESD-Protected Data and Control Inputs
MAX5018
________________________Applications
High-Resolution Color or Monochrome Raster
Graphics Displays to 1500 x 1800 Pixels
Medical Electronics: CAT, PET, and MRI Displays
CAD/CAE Workstations
Solids Modeling
General-Purpose, High-Speed Digital-to-Analog
Conversion
Digital Synthesizers
Automated Test Equipment
Digital Transmitters/Modulators
______________Ordering Information
PART
MAX5018AIPG
MAX5018BIPG
TEMP. RANGE
-20°C to +85°C
-20°C to +85°C
PIN-PACKAGE
24 Plastic DIP
24 Plastic DIP
__________________Pin Configuration
TOP VIEW
D3 1
D2 2
D1 3
D0 4
V
EE
5
CONV 6
CONV 7
FT 8
V
CC
9
FH 10
Blank 11
BRT 12
24 D4
23 D5
22 D6
21 D7
________________Functional Diagram
MAX5018
20 V
EE
19 Out+
18 Out-
17 V
CC
16 COMP
15 Ref+
14 Ref-
13 Sync
MAX5018
DIP
________________________________________________________________
Maxim Integrated Products
1
For the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
8-Bit, High-Speed DAC
MAX5018
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
V
EE
(measured to V
CC
)..........................................-7.0V to 0.5V
Input Voltages
CONV, Data, and Controls (measured to V
CC
)........V
EE
to 0.5V
Ref+ (measured to V
CC
) ..........................................V
EE
to 0.5V
Ref- (measured to V
CC
)............................................V
EE
to 0.5V
Operating Temperature Ranges
Ambient .............................................................-20°C to +85°C
Junction..........................................................................+175°C
Lead Temperature (soldering, 10sec) .............................+300°C
Storage Temperature Range .............................-60°C to +150°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= ground, V
EE
= -5.2V ±0.3V, C
C
= 0pF, I
SET
= 1.105mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Integral Linearity Error
Differential Linearity Error
Gain Error
Gain-Error Tempco
Input Capacitance,
Ref+, Ref-
Compliance Voltage,
Positive Output
Compliance Voltage,
Negative Output
Equivalent Output
Resistance
Output Capacitance
Maximum Current,
Positive Output
Maximum Current,
Negative Output
Output Offset Current
Input Voltage, Logic High
Input Voltage, Logic Low
Convert Voltage,
Common-Mode Range
Convert Voltage,
Differential
Input Current, Logic Low,
Data and Controls
Input Current, Logic High,
Data and Controls
Input Current, Convert
I
IL
I
IH
I
CONV
R
OUT
C
OUT
IO+
(MAX)
IO-
(MAX)
I
OS
V
IH
V
IL
C
REF
SYMBOL
ILE
DLE
CONDITIONS
1.0mA < I
SET
< 1.3mA
1.0mA < I
SET
< 1.3mA
TEST
LEVEL
VI
VI
VI
V
V
VI
VI
VI
V
IV
IV
VI
VI
VI
IV
IV
VI
VI
VI
-0.5
0.4
35
40
2
-1.0
-1.5
-2.5
1.2
120
120
60
45
-45
0.05
0.5
-1.2
-1.2
20
12
MIN
-0.37
-0.95
-0.2
-0.5
-6.5
150
5
1.5
1.5
TYP
MAX
0.37
0.95
0.2
0.5
6.5
UNITS
% Full Scale
LSB
% Full Scale
LSB
% Full Scale
ppm/°C
pF
V
V
kΩ
pF
mA
mA
LSB
V
V
V
V
µA
µA
µA
2
_______________________________________________________________________________________
8-Bit, High-Speed DAC
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= ground, V
EE
= -5.2V ±0.3V, C
C
= 0pF, I
SET
= 1.105mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Input Capacitance, Data
and Controls
Power-Supply Sensitivity
Supply Current
SYMBOL
C
IN
CONDITIONS
TEST
LEVEL
V
VI
VI
-120
MIN
TYP
3
20
155
120
220
MAX
UNITS
pF
µA/V
mA
MAX5018
I
EE
AC ELECTRICAL CHARACTERISTICS
(R
L
= 37.5Ω, C
L
= 5pF, I
SET
= 1.105mA, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Maximum Conversion Rate
SYMBOL
MAX5018B
MAX5018A
t
R
10% to 90% G.S., T
A
= T
MIN
to T
MAX
10% to 90% G.S., R
L
= 25Ω
To 0.2% G.S.
To 0.8% G.S.
To 0.2% G.S., R
L
= 25Ω
T
A
= T
MIN
to T
MAX
T
A
= T
MIN
to T
MAX
B Grade
A Grade
Area = 1/2VT
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
20% to 80% G.S., T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= T
MIN
to T
MAX
CONDITIONS
TEST
LEVEL
III
III
III
IV
V
V
V
V
III
IV
III
IV
III
III
V
V
III
IV
III
IV
III
IV
III
IV
MIN
165
275
1.6
2.0
1.0
7.0
5.5
4.5
2.2
3.2
3.0
1.8
4
1.0
1.0
1.0
0.5
0.5
390
325
-48
-48
TYP
MAX
UNITS
Msps
Msps
ns
Rise Time
Current Settling Time,
Clocked Mode
Clock to Output Delay,
Clocked Mode
Data to Output Delay,
Transparent Mode
Convert Pulse Width,
(low or high)
Glitch Energy
Reference Bandwidth, -3dB
Setup Time, Data and
Controls
Hold Time, Data and
Controls
Slew Rate
Clock Feedthrough
t
SI
ns
4.0
4.5
6.0
6.0
t
DSC
t
DST
t
PWL
,
t
PWH
ns
ns
ns
pV-s
MHz
ns
ns
V/µs
dB
t
S
t
H
_______________________________________________________________________________________
3
8-Bit, High-Speed DAC
MAX5018
TEST-LEVEL CODES
All electrical characteristics are subject to
the following conditions:
All parameters having min/max specifica-
tions 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 specifica-
tion is not tested at the specified condition.
Unless otherwise noted, all tests are pulsed
tests; therefore, T
j
= T
C
= T
A
.
TEST LEVEL
I
II
III
IV
V
VI
TEST PROCEDURE
100% production tested at the specified temperature.
100% production tested at T
A
= +25°C, and sample
tested at the specified temperatures.
QA sample tested at only the specified temperatures.
Parameter is guaranteed (but not tested) by design
and characterization data.
Parameter is a typical value for reference only.
100% production tested at T
A
= +25°C. Parameter is
guaranteed over specified temperature range.
______________________________________________________________Pin Description
PIN
1, 2, 3
4
5, 20
6
7
8
9, 17
10
11
12
13
14
15
16
18
19
21
22, 23, 24
NAME
D3, D2, D1
D0
V
EE
CONV
CONV
FT
V
CC
FH
Blank
BRT
Sync
Ref-
Ref+
COMP
Out-
Out+
D7
D6, D5, D4
Data Bits 3, 2, and 1
Data Bit 0 (LSB)
Negative Supply
Convert Clock Input
Convert-Clock-Input Complement
Register Feedthrough Control
Positive Supply
Data Force-High Control
Video Blank Input
Video Bright Input
Video Sync Input
Reference Current, Negative Input
Reference Current, Positive Input
Compensation Input
Output Current Negative
Output Current Positive
Data Bit 7 (MSB)
Data Bits 6, 5, and 4
FUNCTION
4
_______________________________________________________________________________________
8-Bit, High-Speed DAC
_______________Detailed Description
The MAX5018 is an ultra-high-speed video digital-to-
analog converter (DAC) capable of up to 275Msps con-
version rates. This high speed makes the device
suitable for driving 1500 x 1800 pixel displays at 70Hz
to 90Hz update rates.
The MAX5018 is separated into different conversion-
rate categories, as shown in Table 1.
The MAX5018 has ECL logic-level-compatible video
controls and data inputs. The complementary analog
output currents produced by the devices are propor-
tional to the product of the digital control and data
inputs in conjunction with the analog reference current.
The MAX5018 is segmented so that the input data’s
four MSBs are separated into a parallel thermometer
code. From here, fifteen identical current sinks are driv-
en to fabricate sixteen coarse output levels. The
remaining four LSBs drive four binary-weighted current
switches.
MSB currents are then summed with the LSBs that con-
tribute one-sixteenth of full-scale to provide the 256 dis-
tinct analog output levels.
The video-control inputs drive weighted current sinks,
which are added to the output current to produce com-
posite video-output levels. These controls (sync, blank,
reference white (force high), and bright) are required in
video applications.
A feature that similar video DACs do not have is feed-
through control. The feedthrough pin (FT) allows regis-
tered or unregistered operation of the video control and
data inputs. In registered mode, the composite func-
tions are latched to the pixel data to prevent screen-
edge distortions (generally found on unregistered video
DACs).
__________Applications Information
General
Figure 1 shows a typical application using the MAX5018
in a color-raster circuit. The MAX5018 requires few exter-
nal components and is extremely easy to use. The
MAX5018’s very high operating speeds require good cir-
cuit layout, supply decoupling, and proper transmission-
line design. For best performance, note the following
considerations.
MAX5018
Input Considerations
Video-input data and controls can be directly con-
nected to the MAX5018. Note that all ECL inputs are
terminated as closely to the device as possible to
reduce ringing, crosstalk, and reflections. Maxim rec-
ommends that stripline or microstrip techniques be
used for all ECL interfaces. A convenient and common-
ly used microstrip impedance is about 130Ω, which is
easily terminated using a 330Ω resistor to V
EE
and a
220Ω resistor to ground. This arrangement gives a
Thevenin-equivalent termination of 130Ω to -2V without
the need for a -2V supply. Standard single in-line pack-
age (SIP) 220/330 resistor networks are available for
this purpose.
Figure 2 shows equivalent input circuits.
Output Considerations
The analog outputs are designed to directly drive a
dual 50Ω or 75Ω load-transmission system as shown in
Figure 1. The MAX5018 output source impedances are
high-impedance current sinks. The load impedance
(R
L
) must be 25Ω or 37.5Ω to attain standard RS-343-A
video levels. Any deviation from this impedance affects
the resulting video output levels proportionally. As with
the data interface, it is important that all analog trans-
mission lines have matched impedance throughout,
including connectors and transitions between printed
wiring and coaxial cable. The combination of matched
source-termination resistor R
S
and load terminator R
L
minimizes reflections of both forward and reverse trav-
eling waves in the analog transmission system.
Table 1. The MAX5018 Family and
Speed Designations
PART
MAX5018A
UPDATE
275Msps
COMMENTS
Suitable for 1200 x 1500 to
1500 x 1800 displays at
60Hz to 90Hz update rate.
Suitable for 1024 x 1280 to
1200 x 1500 displays at
60Hz to 90Hz update rate.
Power Considerations
The MAX5018 has two analog power-supply pins and
operates from a standard -5.2V single supply. Proper
supply bypassing augments the MAX5018’s inherent
supply-noise-rejection characteristics. As shown in
Figure 1, each supply pin should be bypassed as
close to the device as possible with 0.01µF and 10µF
capacitors.
MAX5018B
165Msps
_______________________________________________________________________________________
5
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