MAX5018 データシートの表示（PDF） - Maxim Integrated

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MAX5018

8-Bit, High-Speed DAC

Maxim Integrated 

8-Bit, High-Speed DAC

Conv

Conv

IBias

VEE

Ref In

ISet

Reference

Segment

Switch

VCC

Data and

Controls

IBias

IBias

IBias

VEE

V

80 kΩ

VEE

Figure 2. Equivalent Input Circuits—Data, Clock, Controls, and Reference

Compensation

The MAX5018 provides an external compensation input

(COMP) for the reference buffer amplifier. To use this

pin correctly, connect a capacitor between COMP and

VEE, as shown in Figure 1. Keep lead lengths as short

as possible. Use a large capacitor (0.01µF) if the refer-

ence is to be kept as a constant. The capacitor’s value

determines the amplifier’s bandwidth. If reference mod-

ulation is required, smaller capacitance values can be

used to achieve up to a 1MHz bandwidth.

Data Inputs and Video Controls

The MAX5018 has standard, single-ended data inputs.

The inputs are registered to produce the lowest differ-

ential data-propagation delay (skew) to minimize glitch-

ing. Also, four video-control inputs generate composite

video outputs: sync, blank, bright, and reference white

(force high). Feedthrough control is also provided. All

of the controls and data inputs are ECL compatible. In

addition, all have internal pulldown resistors to leave

them at a logic low so the pins are inactive when not

used. This feature is useful if the devices are applied as

standard DACs without the need for video controls, or if

fewer than eight bits are used.

The MAX5018 is usually configured in synchronous

mode. In this mode, the controls and data are synchro-

nized to prevent pixel dropout. This reduces screen-

edge distortions and provides the lowest output noise

while maintaining the highest conversion rate. With the

FT control open (low), each rising edge of the convert

clock (CONV) latches decoded data and control values

into a D-type internal register. The switched-current

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