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TLV5626 Datasheet(PDF) 13 Page - Texas Instruments

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Part # TLV5626
Description  2.7 V TO 5.5 V LOW POWER DUAL 8-BIT DIGITAL-TO-ANALOG CONVERTER WITH INTERNAL REFERENCE AND POWER DOWN
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLV5626 Datasheet(HTML) 13 Page - Texas Instruments

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TLV5626
2.7 V TO 5.5 V LOW POWER DUAL 8-BIT DIGITAL-TO-ANALOG
CONVERTER WITH INTERNAL REFERENCE AND POWER DOWN
SLAS236 –JUNE 1999
13
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
APPLICATION INFORMATION
examples of operation: (continued)
D Set DAC A value, set DAC B value, update both simultaneously, select slow mode, select internal reference
at 1.024 V:
1.
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
2.
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
0
0
0
0
X = Don’t care
3.
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
0
0
0
0
X = Don’t care
Both outputs are updated on the rising clock edge after D0 from the DAC A data word is sampled.
D 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
linearity, offset, and gain error using single ended supplies
When an amplifier is operated from a single supply, the voltage offset can still be either positive or negative. With
a positive offset, the output voltage changes on the first code change. With a negative offset, the output voltage
may not change with the first code, depending on the magnitude of the offset voltage.
The output amplifier attempts to drive the output to a negative voltage. However, because the most negative
supply rail is ground, the output cannot drive below ground and clamps the output at 0 V.
The output voltage then remains at zero until the input code value produces a sufficient positive output voltage
to overcome the negative offset voltage, resulting in the transfer function shown in Figure 14.
DAC Code
Output
Voltage
0 V
Negative
Offset
Figure 14. Effect of Negative Offset (single supply)


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