Rainbow Electronics MAX5489 User Manual
Page 12
MAX5487/MAX5488/MAX5489
Dual, 256-Tap, Nonvolatile, SPI-Interface,
Linear-Taper Digital Potentiometers
12
______________________________________________________________________________________
Figure 7. Adjustable Voltage Reference
MAX6160
IN
5V
OUT
ADJ
GND
HA
LA
WA
VOUT1
IN
OUT
ADJ
GND
HB
LB
WB
V
OUT2
1/2 MAX5487
1/2 MAX5488
1/2 MAX5489
MAX6160
1/2 MAX5487
1/2 MAX5488
1/2 MAX5489
FOR THE MAX5487
V
OUT_
= 1.23V x
10k
Ω
R
FOR THE MAX5488
V
OUT_
= 1.23V x
50k
Ω
R
FOR THE MAX5489
V
OUT_
= 1.23V x
100k
Ω
R
R
2
= R
HL
x D / 256
WHERE R
HL
= END-TO-END RESISTANCE
AND D = DECIMAL VALUE OF WIPER CODE
R
R
Figure 8. Offset Voltage and Gain Adjustment
3
2
5V
7
4
1
6
8
MAX410
HA
LA
WA
R2
R1
HB
LB
WB
1/2 MAX5487/MAX5488/MAX5489
1/2 MAX5487/MAX5488/MAX5489
R
2
= R
HL
x D / 256
WHERE R
HL
= END-TO-END RESISTANCE
AND = D DECIMAL VALUE OF WIPER CODE