max5387laud Maxim Integrated Products, Inc., max5387laud Datasheet - Page 12

• Manufacturer Part Number: max5387laud
• Description: Dual, 256-tap, Volatile, Low-voltage Linear Taper Digital Potentiometer
• Manufacturer: Maxim Integrated Products, Inc.

REG B: The data byte writes to register B and the wiper
of potentiometer B moves to the appropriate position.
D[7:0] indicates the position of the wiper. D[7:0] = 00h
moves the wiper to the position closest to LB. D[7:0] =
FFh moves the wiper to the position closest to HB. D[7:0]
is 80h following power-on.
REGS A and B: The data byte writes to registers A and
B and the wipers of potentiometers A and B move to
the appropriate position. D[7:0] indicates the position
of the wiper. D[7:0] = 00h moves the wipers to the posi-
tion closest to L_. D[7:0] = FFh moves the wipers to the
position closest to H_. D[7:0] is 80h following power-on.
Figure 8 shows a potentiometer adjusting the gain of a
noninverting amplifier. Figure 9 shows a potentiometer
adjusting the gain of an inverting amplifier.
Figure 8. Variable Gain Noninverting Amplifier
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Table 2. I
12
CYCLE NO.
A AND B
REG A
REG B
REGS
SCL
_____________________________________________________________________________________
2
C Command Byte Summary
Applications Information
A6
1
0
0
0
L
V
A5
IN
2
1
1
1
W
A4
ADDRESS BYTE
3
0
0
0
Variable Gain Amplifier
H
A3
4
1
1
1
A2
A2
A2
A2
5
A1
A1
A1
A1
6
A0
A0
A0
A0
7
V
OUT
W
8
0
0
0
ACK
(A)
9
R7
10
0
0
0
R6
11
0
0
0
R5
12
0
0
0
COMMAND BYTE
R4
13
1
1
1
Figure 10 shows an adjustable dual linear regulator
using a dual potentiometer as two variable resistors.
Figure 11 shows an adjustable voltage reference circuit
using a potentiometer as a voltage-divider.
Figure 9. Variable Gain Inverting Amplifier
Figure 10. Adjustable Dual Linear Regulator
R3
14
0
0
0
V+
15
R2
IN
0
0
0
MAX8866
R1
16
0
1
1
V
R0
17
1
0
1
IN
OUT1
OUT2
SET1
SET2
ACK
(A)
18
Adjustable Voltage Reference
D7
D7
D7
D7
19
Adjustable Dual Regulator
D6
D6
D6
D6
20
W
H
D5
D5
D5
D5
21
H
L
D4
D4
D4
D4
DATA BYTE
22
W
H
L
D3
D3
D3
D3
23
L
W
D2
D2
D2
D2
24
V
OUT
D1
D1
D1
D1
25
D0
D0
D0
D0
26
ACK
V
(A)
V
27
OUT1
OUT2