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DAC8564IAPWR Scheda tecnica(PDF) 33 Page - Texas Instruments

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Il numero della parte DAC8564IAPWR
Spiegazioni elettronici  16-Bit, Quad Channel, Ultra-Low Glitch, Voltage Output
PDF  51 Pages
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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DAC8564IAPWR Scheda tecnica(HTML) 33 Page - Texas Instruments

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DAC8564
www.ti.com
SBAS403D
– JUNE 2007 – REVISED MAY 2011
OPERATING EXAMPLES: DAC8564
For the following examples, ensure that DAC pins A0 and A1 are both connected to ground. Pins A0 and A1
must always match data bits DB22 and DB23 within the SPI write sequence/protocol. X = don't care. Value can
be either '0' or '1'.
Example 1: Write to Data Buffer A Through Buffer D; Load DAC A Through DAC D Simultaneously
•
1st: Write to data buffer A:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
–DB0
(A1)
(A0)
(LD1)
(LD0)
(DAC Sel 1) (DAC Sel 0)
(PD0)
0
0
0
0
0
0
0
0
D15
D14
D13
D12
D11
–D0
•
2nd: Write to data buffer B:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
–DB0
(A1)
(A0)
(LD1)
(LD0)
(DAC Sel 1) (DAC Sel 0)
(PD0)
0
0
0
0
0
0
1
0
D15
D14
D13
D12
D11
–D0
•
3rd: Write to data buffer C:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
–DB0
(A1)
(A0)
(LD1)
(LD0)
(DAC Sel 1) (DAC Sel 0)
(PD0)
0
0
0
0
0
1
0
0
D15
D14
D13
D12
D11
–D0
•
4th: Write to data buffer D and simultaneously update all DACs:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
–DB0
(A1)
(A0)
(LD1)
(LD0)
(DAC Sel 1) (DAC Sel 0)
(PD0)
0
0
1
0
0
1
1
0
D15
D14
D13
D12
D11
–D0
The DAC A, DAC B, DAC C, and DAC D analog outputs simultaneously settle to the specified values upon
completion of the 4th write sequence. (The DAC voltages update simultaneously after the 24th SCLK falling edge
of the fourth write cycle).
Example 2: Load New Data to DAC A Through DAC D Sequentially
•
1st: Write to data buffer A and load DAC A: DAC A output settles to specified value upon completion:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
–DB0
(A1)
(A0)
(LD1)
(LD0)
(DAC Sel 1) (DAC Sel 0)
(PD0)
0
0
0
1
0
0
0
0
D15
D14
D13
D12
D11
–D0
•
2nd: Write to data buffer B and load DAC B: DAC B output settles to specified value upon completion:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
–DB0
(A1)
(A0)
(LD1)
(LD0)
(DAC Sel 1) (DAC Sel 0)
(PD0)
0
0
0
1
0
0
1
0
D15
D14
D13
D12
D11
–D0
•
3rd: Write to data buffer C and load DAC C: DAC C output settles to specified value upon completion:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
–DB0
(A1)
(A0)
(LD1)
(LD0)
(DAC Sel 1) (DAC Sel 0)
(PD0)
0
0
0
1
0
1
0
0
D15
D14
D13
D12
D11
–D0
•
4th: Write to data buffer D and load DAC D: DAC D output settles to specified value upon completion:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
–DB0
(A1)
(A0)
(LD1)
(LD0)
(DAC Sel 1) (DAC Sel 0)
(PD0)
0
0
0
1
0
1
1
0
D15
D14
D13
D12
D11
–D0
After completion of each write cycle, DAC analog output settles to the voltage specified.
Copyright
© 2007–2011, Texas Instruments Incorporated
33



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