MAX5479 Maxim, MAX5479 Datasheet - Page 13

• Manufacturer Part Number: MAX5479
• Description: Dual - 256-Tap/ Nonvolatile/ I2C-Interface/ Digital Potentiometers
• Manufacturer: Maxim

Figure 11. Programmable Filter
Figure 13. Adjustable Voltage Reference
SDA
TOP VIEW
V
SCL
DD
A0
R
WHERE R
AND D = DECIMAL VALUE OF WIPER CODE
1
2
3
4
V
2
, R
IN
MAX6160
3
= R
N.C.
16
GND
A1
5
5V
IN
HL
(3mm x 3mm)
HL
HA
= END-TO-END RESISTANCE
THIN QFN
x D / 256
MAX5477
MAX5478
MAX5479
15
A2
HA
6
OUT
ADJ
GND
WA
14
Dual, 256-Tap, Nonvolatile, I
MAX5477
MAX5478
MAX5479
7
R
WA
3
______________________________________________________________________________________
WA
N.C.
13
LA
8
R
LA
HA
12
11
10
LA
9
Pin Configurations
HB
WB
LB
WP
1/2 MAX5477
1/2 MAX5478
1/2 MAX5479
C
WA
WB
WP
R
HA
HB
LA
LB
2
V OUT1
LB
1
2
3
4
5
6
7
HB
(4.4mm x 5mm)
MAX410
WB
MAX5477
MAX5478
MAX5479
V+
V-
TSSOP
R
1
MAX6160
V
OUT
14
13
12
11
10
8
9
GND
IN
V
SCL
SDA
A0
A1
A2
GND
DD
OUT
ADJ
WB
Connect the high and low terminals of one potentiome-
ter of a MAX5477 between the NULL inputs of a
MAX410 and the wiper to the op amp’s positive supply
to nullify the offset voltage over the operating tempera-
ture range. Install the other potentiometer in the feed-
back path to adjust the gain of the MAX410 (Figure 12).
Figure 13 shows the MAX5477/MAX5478/MAX5479
used as the feedback resistors in multiple adjustable
voltage reference applications. Independently adjust
the output voltages of the MAX6160 parts from 1.23V to
V
MAX5477/MAX5478/MAX5479.
Figure 12. Offset Voltage Adjustment Circuit
TRANSISTOR COUNT: 12,651
PROCESS: BiCMOS
Digital Potentiometers
IN
R
- 0.2V by changing the wiper positions of the
LB
HB
R2
HB
LB
Offset Voltage and Gain Adjustment
1/2 MAX5477
1/2 MAX5478
1/2 MAX5479
3
2
V
OUT2
7
5V
MAX410
WB
4
1
Adjustable Voltage Reference
1/2 MAX5477
HA
R1
8
V
V
V
WA
OUT_
OUT_
OUT_
WHERE R = R
AND D = DECIMAL VALUE OF WIPER CODE
2
R
WHERE R
AND = D DECIMAL VALUE OF WIPER CODE
= 1.23V x
= 1.23V x
= 1.23V x
C-Interface,
2
1/2 MAX5477
= R
Chip Information
6
HL
LA
x D / 256
HL
HL
100kΩ
= END-TO-END RESISTANCE
10kΩ
50kΩ
x D / 256
R
R
R
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FOR THE MAX5477
FOR THE MAX5478
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13