MP7226

10

Rev. 2.00

AGND

DAC

–

+

R2

R1

if R1 = R2

Figure 5. Bipolar Output Circuit

–

+

Bipolar Binary Operation

The Bipolar Mode configuration for each DAC requires one

external op-amp and two resistors per channel.

Figure 5. shows a typical Bipolar Operation circuit using the

MP7226.

Table 3. shows the code relationship for the circuit of

Figure 5. assuming R1 = R2 .

AC Reference Signal

An AC signal can be applied to the reference of the MP7226

for multiplying capability within the upper (+10V) and lower

(+2V) limits of the reference voltage input, with either single or

dual supplies . This signal must be level shifted or AC coupled

with proper bias level before being applied to the reference in-

put.

Figure 6. shows techniques for applying an AC signal to the

MP7226. Since all four DACs share a common reference, they

will all share this AC modulated reference. Input frequencies up

to 50kHz will typically be distorted less than 0.1% .

–5 V or GND

AGND

DAC

–

+

R1

Figure 6. AC Reference Input Signal Circuit (AC Couple)

–

+

R2

C

AC

Reference

Input

+4 V

–4 V

+15 V

DC

Offset

+10 V

+2 V