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LTC2755 Datasheet(PDF) 20 Page - Linear Technology

Part # LTC2755
Description  Quad Current Output 12-/14-/16-Bit SoftSpan DACs with Parallel I/O
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2755 Datasheet(HTML) 20 Page - Linear Technology

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LTC2755
20
2755f
Grounding
As with any high resolution converter, clean grounding is
important. A low impedance analog ground plane and star
grounding techniques should be used. IOUT2X must be tied
to the star ground with as low a resistance as possible.
When it is not possible to locate star ground close to
IOUT2, a low resistance trace should be used to route this
pin to star ground. This minimizes the voltage drop from
this pin to ground caused by the code dependent current
flowing to ground. When the resistance of this circuit
board trace becomes greater than 1Ω, a force/sense am-
plifier configuration should be used to drive this pin (see
APPLICATIONS INFORMATION
Figure 2). This preserves the excellent accuracy (1LSB
INL and DNL) of the LTC2755-16.
Layout
Figures 3, 4, 5, and 6 show the layout for the LTC2755
evaluation board, DC1112. This shows how to route
the digital signals around the device without interfering
with the reference and output op amps. Complete demo
board documentation is available in the DC1112 quick
start guide.
1/2 LT1469
1/2 LT1469
DAC A
LTC2755-16
VREF
5V
2
1
3
59
60
61
64
63
1
62
IOUT1A
15pF
IOUT2A
RFBA
RVOSA
REFA
RCOM1
RIN1
ROFSA
VOUTA
2
58
6
1
23
IOUT2
2
3
*SCHOTTKY BARRIER DIODE
ZETEX*
BAT54S
LT1001
2755 F02
1000pF
ALTERNATE AMPLIFIER FOR OPTIMUM SETTLING TIME PERFORMANCE
6
1
23
2,14, 34, 46
LT1468
3
ZETEX
BAT54S
2
200Ω
200Ω
IOUT2
150pF
3
2
DAC B
DAC C
DAC D
+
+
+
Figure 2. Optional Circuits for Driving IOUT2 from GND with a Force/Sense Amplifier.


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