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TLV5638 Datasheet(PDF) 12 Page - Texas Instruments

Part No. TLV5638
Description  2.7-V TO 5.5-V LOW-POWER DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTER WITH INTERNAL REFERENCE AND POWER DOWN
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV5638 Datasheet(HTML) 12 Page - Texas Instruments

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EXAMPLES OF OPERATION:
TLV5638
SLAS225C – JUNE 1999 – REVISED JANUARY 2004
1. Set DAC A output, select fast mode, select internal reference at 2.048 V:
a.
Set reference voltage to 2.048 V (CONTROL register)
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
1
0
1
0
0
0
0
0
0
0
0
0
0
1
0
b.
Write new DAC A value and update DAC A output:
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
1
0
0
New DAC A output value
The DAC A output is updated on the rising clock edge after D0 is sampled.
To output data consecutively using the same DAC configuration, it is not necessary to program the
CONTROL register again.
2. Set DAC B output, select fast mode, select external reference:
a.
Select external reference (CONTROL register):
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
b.
Write new DAC B value to BUFFER and update DAC B output:
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
1
0
0
New BUFFER content and DAC B output value
The DAC A output is updated on the rising clock edge after D0 is sampled.
To output data consecutively using the same DAC configuration, it is not necessary to program the
CONTROL register again.
3. Set DAC A value, set DAC B value, update both simultaneously, select slow mode, select internal reference
at 1.024 V:
a.
Set reference voltage to 1.024 V (CONTROL register)
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
b.
Write data for DAC B to BUFFER:
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
1
New DAC B value
c.
Write new DAC A value and update DAC A and B simultaneously:
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
0
0
0
New DAC A value
Both outputs are updated on the rising clock edge after D0 from the DAC A data word is sampled.
To output data consecutively using the same DAC configuration, it is not necessary to program the
CONTROL register again.
1. Set power-down mode:
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X = Don't care
12


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