MP7226KP 查看數據表（PDF） - Exar Corporation

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MP7226KP

BiCMOS Fixed, Quad, Voltage Output, Single or Dual Supply 8-Bit Digital-to-Analog Converter

Exar Corporation 

MP7226

R

DAC

R

Output

R

VOFFSET

R

–

+

VOUT

VOUT = Dn X VREF + VOFFSET

where Dn is the digital input code

and can vary 0 to 255

R

R

DAC

Output1

DAC

Output2

–

R

+

R

VOUT

VOUT = Dn1 X VREF + Dn2 X VREF

where Dn is the digital input code and

can vary 0 to 255

Figure 7. Digitally Programmable Offset Adjustment Circuits

AC

Reference

+

Input

–

DAC

or DC Voltage

+15 V

VREF

VDD

–

DAC

+

VOUT

VSS

–5 V or GND

AGND

Figure 8. Digitally Programmable

AC Reference Input Signal Circuit (DC Couple)

Offsetting DAC Outputs

Figure 7. shows examples of offset circuits.

DAC offset effects

When using the device in single supply applications, and

minimum reference voltage, there is a possibility that the DAC

output will not change when the code is incremented from 0.

Once the DAC has reached the offset voltage of the output

Rev. 2.00

buffer, the DAC output will begin to increment in a normal opera-

tion.

5V Operation

The MP7226 can be operated with a single power supply

(VDD = +5V ) or dual power supplies ( VDD = +5V and VSS =

–5V) . The reference voltage range is reduced along with Some

performance parameter degradation. However the DNL of each

DAC remains at 1 LSB guaranteeing monotonicity.

11

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