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參數(shù)資料
| 型號(hào)： | MAX5018 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 電可擦除可編程邏輯器件 |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大小： | 142K |
| 代理商： | MAX5018 |
_______________Detailed Desc ription
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).
__________Applic ations 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.
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 130
, which is
easily terminated using a 330
resistor to V
EE
and a
220
resistor to ground. This arrangement gives a
Thevenin-equivalent termination of 130
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 50
or 75
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 25
or 37.5
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.
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.
M
8-Bit, High-S peed DAC
_______________________________________________________________________________________
5
PART
UPDATE
COMMENTS
MAX5018A
275Msps
Suitable for 1200 x 1500 to
1500 x 1800 displays at
60Hz to 90Hz update rate.
MAX5018B
165Msps
Suitable for 1024 x 1280 to
1200 x 1500 displays at
60Hz to 90Hz update rate.
Table 1. The MAX5018 Family and
Speed Designations
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5018AIPG | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:8-Bit, High-Speed DAC |
| MAX5018BIPG | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:8-Bit, High-Speed DAC |
| MAX5019 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Current-Mode PWM Controllers with Integrated Startup Circuit |
| MAX5019CSA | 功能描述:電流型 PWM 控制器 w/Integrated Startup RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX5019CSA+ | 功能描述:電流型 PWM 控制器 w/Integrated Startup RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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