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MAX530ACAG View Datasheet(PDF) - Maxim Integrated

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MAX530ACAG Datasheet PDF : 16 Pages
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+5V, Low-Power, Parallel-Input,
Voltage-Output, 12-Bit DAC
Table 3. Unipolar Binary Code Table
(0V to VREFIN Output), Gain = 1
INPUT
OUTPUT
1111 1111 1111
1000 0000 0001
1000 0000 0000
4095
(VREFIN) 4096
2049
(VREFIN) 4096
2048
(VREFIN) 4096 = +VREFIN/2
0111 1111 1111
2047
(VREFIN) 4096
0000 0000 0001
0000 0000 0000
1
(VREFIN) 4096
OV
Table 4. Unipolar Binary Code Table
(0V to 2VREFIN Output), Gain = 2
INPUT
OUTPUT
1111 1111 1111
1000 0000 0001
1000 0000 0000
4095
+2 (VREFIN) 4096
2049
+2 (VREFIN) 4096
+2
(VREFIN)
2048
4096
=
+VREFIN
0111 1111 1111
2047
+2 (VREFIN) 4096
0000 0000 0001
0000 0000 0000
1
+2 (VREFIN) 4096
OV
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, 1 LSB = REFIN (2 -11).
Four-Quadrant Multiplication
The MAX530 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 12-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 212 or 4,096.
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 there is the
same number of steps. 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.
Table 5. Bipolar (Offset Binary) Code Table
(-VREFIN to +VREFIN Output)
INPUT
OUTPUT
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
2047
(+VREFIN) 2048
(+VREFIN)
1
2048
0V
1
(-VREFIN) 2048
0000 0000 0001
0000 0000 0000
2047
(-VREFIN) 2048
(-VREFIN)
2048
2048
=
-VREFIN
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