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AD8842 データシート(PDF) 11 Page - Analog Devices

部品番号 AD8842
部品情報  8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC
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ホームページ  http://www.analog.com
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AD8842 データシート(HTML) 11 Page - Analog Devices

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AD8842
REV. 0
–11–
Figure 32 shows a three-wire interface for a single AD8842 that
easily cascades for multiple packages. This circuit topology often
called daisy chaining requires preformating all the serial data for
each package in the chain. In the case of the 3 packages shown a
36 bit data word must be completely clocked into all the
AD8842 serial data input registers then the LD strobe would
transfer the data bits into the DAC registers updating one DAC
in each package.
Figure 32. Three-Wire Interface Updates Multiple
AD8842s
Figure 31. Addressing Multiple AD8842 Packages
There is some digital feedthrough from the digital input pins.
Operating the clock only when the DAC registers require updat-
ing minimizes the effect of the digital feedthrough on the analog
signal channels. Measurements of DAC switch feedthrough
shown in the electrical characteristics table were accomplished
by grounding the VINx inputs and cycling the data codes be-
tween all zeros and all ones. Under this condition 5 nV-s of
feedthrough was measured on the output of the switched DAC
channel. An adjacent channel measured less than 1 nV-s of digi-
tal crosstalk. The digital feedthrough and crosstalk photographs
shown in the typical performance characteristics section display
these characteristics (Figures 15 and 17).
AD8842
#2
LD
CLK
SDI
AD8842
#1
LD
CLK
SDI
AD8842
#N
LD
CLK
SDI
CLOCK
DATA
CODED
PACKAGE
ADDRESS
WR
ADDRESSS
DECODE
EN
ANALOG CONNECTIONS OMITTED FOR CLARITY
µC
PA0
PA1
PA2
DATA
CLOCK
LD
DAC A
SDI
CLK
AD8842 #1
LD
SDO
DAC H
DAC A
SDI
CLK
AD8842 #2
LD
SDO
DAC H
DAC A
SDI
CLK
AD8842 #3
LD
SDO
DAC H
VOU
VO


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