MAX503CAG datasheet(14/16 Pages) MAXIM

14 / 16 page

5V, Low-Power, Parallel-Input,

Voltage-Output, 10-Bit DAC

______________________________________________________________________________________

INPUT*

OUTPUT

1111

11(00)

1000

0000

01(00)

1000

0000

00(00)

0111

1111

11(00)

0000

01(00)

0000

00(00)

(VREFIN)

1023

1024

(VREFIN)

513

1024

(VREFIN)

512

1024

(VREFIN)

511

1024

(VREFIN)

1024

= +VREFIN/2

Table 3. Unipolar Binary Code Table

(0V to VREFIN Output), Gain = 1

INPUT*

OUTPUT

1111

11(00)

1000

0000

01(00)

1000

0000

00(00)

0111

1111

11(00)

0000

01(00)

0000

00(00)

+2 (VREFIN)

1023

1024

+2 (VREFIN)

513

1024

+2 (VREFIN)

512

1024

+2 (VREFIN)

511

1024

+2 (VREFIN)

1024

= +VREFIN

Table 4. Unipolar Binary Code Table

(0V to 2VREFIN Output), Gain = 2

INPUT*

OUTPUT

1111

11(00)

1000

0000

01(00)

1000

0000

00(00)

0111

1111

11(00)

0000

01(00)

0000

00(00)

(+VREFIN)

511

512

(+VREFIN)

512

(-VREFIN)

512

(-VREFIN)

511

512

(-VREFIN)

512

= -VREFIN

Table 5. Bipolar (Offset Binary) Code

Table (-VREFIN to +VREFIN Output)

Bipolar Configuration

A -VREFIN to +VREFIN bipolar range is set up by con-

necting ROFS to REFIN and RFB to VOUT, and operat-

ing from dual (±5V) supplies (Figure 11). Table 5

shows the DAC-latch contents (input) vs. VOUT (out-

put). In this range, 1LSB = VREFIN (2 -9).

Four-Quadrant Multiplication

The MAX503 can be used as a four-quadrant multiplier

by connecting ROFS to REFIN and RFB to VOUT, and

using (1) an offset binary digital code, (2) bipolar

power supplies, and (3) a bipolar analog input at

REFIN within the range VSS + 2V to VDD - 2V, as shown

in Figure 12.

In general, a 10-bit DAC’s output is D(VREFIN)(G),

where “G” is the gain (1 or 2) and “D” is the binary rep-

resentation of the digital input divided by 210 or 1,024.

This formula is precise for unipolar operation. However,

for bipolar, offset binary operation, the MSB is really a

polarity bit. No resolution is lost because the number of

steps is the same. The output voltage, however, has

been shifted from a range of, for example, 0V to

4.096V (G = 2) to a range of -2.048V to +2.048V.

Keep in mind that when using the DAC as a four-quad-

rant multiplier, the scale is skewed. The negative full

scale is -VREFIN, while the positive full scale is

+VREFIN - 1LSB.

* Write 10-bit data words with two sub-LSB 0s because the

DAC input latch is 12 bits wide.

* Write 10-bit data words with two sub-LSB 0s because the

DAC input latch is 12 bits wide.

* Write 10-bit data words with two sub-LSB 0s because the

DAC input latch is 12 bits wide.

MAX503CAG Datasheet(PDF) 14 Page - Maxim Integrated Products

MAX503CAG Datasheet(HTML) 14 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Datasheet Download

Link URL