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DAC8811 Folha de dados(PDF) 9 Page - Texas Instruments

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Nome de Peças DAC8811
Descrição Electrónicos  16-Bit, Serial Input Multiplying Digital-to-Analog Converter
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
Logo TI - Texas Instruments

DAC8811 Folha de dados(HTML) 9 Page - Texas Instruments

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t(CSS)
t(DS)
t(DH)
t(CH)
t(CL)
t(CSH)
SDI
CLK
CS
D15
D14 D13 D12
D11 D10
D9
D8
D1
D0
APPLICATION INFORMATION
Stability Circuit
+
U2
GND
U1
VREF
VREF
VDD
VDD
VOUT
C1
IOUT
RFB
Positive Voltage Output Circuit
DAC8811
SLAS411A – NOVEMBER 2004 – REVISED DECEMBER 2004
THEORY OF OPERATION (continued)
Figure 19. DAC8811 Timing Diagram
Table 2. Control Logic Truth Table(1)
CLK
CS
Serial Shift Register
DAC Register
X
H
No effect
Latched
↑+
L
Shift register data advanced one bit
Latched
X
H
No effect
Latched
X
↑+
Shift register data transferred to DAC register
New data loaded from serial register
(1)
↑+ Positive logic transition; X = Don't care
Table 3. Serial Input Register Data Format, Data Loaded MSB First
B15
B0
Bit
(MSB)
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
(LSB)
Data
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
For a current-to-voltage design (see Figure 20), the DAC8811 current output (IOUT) and the connection with the
inverting node of the op amp should be as short as possible and according to correct PCB layout design. For
each code change there is a step function. If the GBP of the op amp is limited and parasitic capacitance is
excessive at the inverting node then gain peaking is possible. Therefore, for circuit stability, a compensation
capacitor C1 (4 pF to 20 pF typ) can be added to the design, as shown in Figure 20.
Figure 20. Gain Peaking Prevention Circuit With Compensation Capacitor
As Figure 21 illustrates, in order to generate a positive voltage output, a negative reference is input to the
DAC8811. This design is suggested instead of using an inverting amp to invert the output due to tolerance errors
of the resistor. For a negative reference, VOUT and GND of the reference are level-shifted to a virtual ground and
a -2.5 V input to the DAC8811 with an op amp.
9


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