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LTC2634HUD-LMI12

LTC2634HUD-LMI12首页预览图
型号: LTC2634HUD-LMI12
PDF文件:
  • LTC2634HUD-LMI12 PDF文件
  • LTC2634HUD-LMI12 PDF在线浏览
功能描述: Quad 12-/10-/8-Bit Rail-to-Rail DACs with 10ppm/°C Reference
PDF文件大小: 363.05 Kbytes
PDF页数: 共30页
制造商: LINER[Linear Technology]
制造商LOGO: LINER[Linear Technology] LOGO
制造商网址: http://www.linear.com
捡单宝LTC2634HUD-LMI12
PDF页面索引
120%
LTC2634
23
2634fb
OPERATION
Rail-to-Rail Output Considerations
In any rail-to-rail voltage output device, the output is limited
to voltages within the supply range.
Since the analog output of the DAC cannot go below ground,
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
CC
. If V
REF
= V
CC
and the DAC full-scale error
(FSE) is positive, the output for the highest codes limits
at V
CC
, as shown in Figure 4c. No full-scale limiting can
occur if V
REF
is less than V
CC
– FSE.
Offset and linearity are defi ned and tested over the region
of the DAC transfer function where no output limiting can
occur.
Board Layout
The PC board should have separate areas for the analog and
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
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.
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 fl ows
out the ground pin and directly to the power ground trace
without affecting the analog ground plane voltage.
It is sometimes necessary to interrupt the ground plane
to confi ne 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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