MAX5140 データシートの表示（PDF） - Maxim Integrated

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MAX5140

8-Bit, Ultra-High-Speed DAC

Maxim Integrated 

8-Bit, Ultra-High-Speed DAC

______________________________________________________________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

VEE

CONV

CONV

FT

VCC

FH

Blank

BRT

Sync

Ref Out

Ref In

ISet

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 Output

Reference Input

Reference Current

Output Current Negative

Output Current Positive

Data Bit 7 (MSB)

Data Bits 6, 5, and 4

FUNCTION

Detailed Description

The MAX5140 is an ultra-high-speed video digital-to-

analog converter (DAC) capable of up to 400Msps con-

version rates. This high speed makes the device

suitable for driving 2048 x 2048 pixel displays at 60Hz

to 90Hz update rates.

In addition, the MAX5140 includes an internal bandgap

reference, which may be used to drive two other

MAX5140s, if desired.

The MAX5140 has ECL logic-level-compatible video

control 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 MAX5140 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).

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