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AD7538 Folha de dados(PDF) 9 Page - Analog Devices

Nome de Peças AD7538
Descrição Electrónicos  Microprocessor-Compatible 14-Bit DAC
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD7538 Folha de dados(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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