Rainbow Electronics MAX5489 - 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