Datasheet > LTC2634HUD-LMX8PBF

LTC2634HUD-LMX8PBF

更新时间： 2022-12-15 00:18:25

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
28页	377K
描述
Quad 12-/10-/8-Bit Rail-to-Rail DACs with 10ppm/°C Reference

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LTC2634

OPERATION

Rail-to-Rail Output Considerations

the LTC2634 GND pin to the ground plane should be as

low as possible. Resistance here will add directly to the

effective DC output impedance of the device (typically

0.1Ω). Note that the LTC2634 is no more susceptible to

this effect than any other parts of this type; on the con-

trary, it allows layout-based performance improvements

to shine rather than limiting attainable performance with

excessive internal resistance.

Inanyrail-to-railvoltageoutputdevice,theoutputislimited

to voltages within the supply range.

SincetheanalogoutputoftheDACcannotgobelowground,

it may limit for the lowest codes as shown in Figure 4b.

Similarly, limiting can occur near full-scale when the REF

pin is tied to V . If V = V and the DAC full-scale error

REF

(FSE) is positive, the output for the highest codes limits

Another technique for minimizing errors is to use a sepa-

rate power ground return trace on another board layer.

The trace should run between the point where the power

supply is connected to the board and the DAC ground pin.

Thus the DAC ground pin becomes the common point for

analog ground, digital ground, and power ground. When

the LTC2634 is sinking large currents, this current ﬂows

out the ground pin and directly to the power ground trace

without affecting the analog ground plane voltage.

at V , as shown in Figure 4c. No full-scale limiting can

occur if V is less than V – FSE.

REF

Offset and linearity are deﬁned and tested over the region

of the DAC transfer function where no output limiting can

occur.

Board Layout

ThePCboardshouldhaveseparateareasfortheanalogand

digital sections of the circuit. A single, solid ground plane

should be used, with analog and digital signals carefully

routed over separate areas of the plane. This keeps digital

signals away from sensitive analog signals and minimizes

the interaction between digital ground currents and the

analog section of the ground plane. The resistance from

It is sometimes necessary to interrupt the ground plane

to conﬁne digital ground currents to the digital portion of

the plane. When doing this, make the gap in the plane only

as long as it needs to be to serve its purpose and ensure

that no traces cross over the gap.

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