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AD7538AQ 데이터시트(PDF) 9 Page - Analog Devices

부품명 AD7538AQ
상세설명  LC2MOS Microprocessor-Compatible 14-Bit DAC
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홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD7538AQ 데이터시트(HTML) 9 Page - Analog Devices

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AD7538
Rev. B | Page 9 of 16
DAC SECTION
Figure 4 shows a simplified circuit diagram for the AD7538
DAC section. The three MSBs of the 14-bit data word are
decoded to drive the seven switches (A to G). The 11 LSBs
of the data word consist of an R-2R ladder operated in a
current steering configuration.
The R-2R ladder current is ⅛ of the total reference input
current. ⅞ current flows in the parallel ladder structure.
Switch A to Switch G steer equally weighted currents between
IOUT and AGND.
Because the input resistance at VREF is constant, it may be driven
by a voltage source or a current source of positive or negative
polarity.
2R
2R
2R
2R
2R
2R
2R
2R
2R
2R
2R
RR
R
R/4
G
F
E
D
C
B
A
S10
S9
S0
VREF
RFB
IOUT
AGND
Figure 4. Simplified Circuit Diagram for the AD7538 DAC Section


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