MAX509 Maxim, MAX509 Datasheet - Page 17

• Manufacturer Part Number: MAX509
• Description: Quad / Serial 8-Bit DACs with Rail-to-Rail Outputs
• Manufacturer: Maxim

Figure 14. MAX509 AGND Bias Circuit (Negative Offset)
Each DAC output may be configured for 4-quadrant
multiplication using Figure 16 and 17's circuit. One op
amp and two resistors are required per channel. With
R1 = R2:
where NB represents the digital word in DAC register A.
The recommended value for resistors R1 and R2 is
330kΩ (±0.1%). Table 3 shows the digital code vs. out-
put voltage for Figure 16 and 17's circuit.
V
MAX873
OUT
+5V
= V
______________________________________________________________________________________
0.1 F
REF
+2.5V
4-Quadrant Multiplication
[2(NB/256)-1]
ICL7611A
0.1%
330k
R1
NOT SHOWN
INTERFACE
SERIAL
2
3
1
7
+5V
-5V
330k
0.1%
8
R2
6
0.1 F
0.1 F
with Rail-to-Rail Outputs
0.1 F
Quad, Serial 8-Bit DACs
5
REFERENCE INPUTS
4
V
DAC B
DAC C
DAC D
-5V
DAC A
SS
3
17
16
AGND
6
18
V
+5V
DD
MAX509
DGND
8
2
1
20
19
0.1 F
OUTA
OUTB
OUTC
OUTD
17