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AD5124 Datasheet(PDF) 23 Page - Analog Devices

Part # AD5124
Description  Dual-Channel, 128-/256-Position, SPI, Nonvolatile Digital Potentiometer
PDF  27 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5124 Datasheet(HTML) 23 Page - Analog Devices

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Data Sheet
AD5122/AD5142
THEORY OF OPERATION
analog.com
Rev. D | 23 of 27
Table 16. Advance Command Operation Truth Table (Continued)
Command
Number
Control Bits[DB15:DB12]
Address Bits[DB11:DB8]1
Data Bits[DB7:DB0]1
Operation
C3
C2
C1
C0
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
6
0
1
0
1
A3
A2
0
A0
X
X
X
X
X
X
X
1
+6 dB RDAC increment
7
0
1
0
1
A3
A2
0
A0
X
X
X
X
X
X
X
0
−6 dB RDAC decrement
8
0
1
1
0
A3
A2
0
A0
X
X
X
X
X
X
X
X
Copy input register to RDAC
(software LRDAC)
9
0
1
1
1
0
A2
0
A0
X
X
X
X
X
X
X
1
Copy RDAC register to EEPROM
10
0
1
1
1
0
A2
0
A0
X
X
X
X
X
X
X
0
Copy EEPROM into RDAC
11
1
0
0
0
0
0
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
Write contents of serial register data
to EEPROM
12
1
0
0
1
A3
A2
0
A0
1
0
0
0
0
0
0
D0
Top scale
D0 = 0; normal mode
D0 = 1; shutdown mode
13
1
0
0
1
A3
A2
0
A0
0
0
0
0
0
0
0
D0
Bottom scale
D0 = 1; enter
D0 = 0; exit
14
1
0
1
1
X
X
X
X
X
X
X
X
X
X
X
X
Software reset
15
1
1
0
0
A3
A2
0
A0
0
0
0
0
0
0
0
D0
Software shutdown
D0 = 0; normal mode
D0 = 1; device placed in shutdown
mode
16
1
1
0
1
X
X
X
X
X
X
X
X
X
D2
D1
D0
Copy serial register data to control
register
1 X means don’t care.
Table 17. Address Bits
A3
A2
A1
A0
Potentiometer Mode
Linear Gain Setting Mode
Stored Channel Memory
Input Register
RDAC Register
Input Register
RDAC Register
1
X1
X1
X1
All channels
All channels
All channels
All channels
Not applicable
0
0
0
0
RDAC1
RDAC1
RWB1
RWB1
RDAC1/RWB1
0
1
0
0
Not applicable
Not applicable
RAW1
RAW1
Not applicable
0
0
0
1
RDAC2
RDAC2
RWB2
RWB2
RAW1
0
1
0
1
Not applicable
Not applicable
RAW2
RAW2
Not applicable
0
0
1
0
Not applicable
Not applicable
Not applicable
Not applicable
RDAC2/RWB2
0
0
1
1
Not applicable
Not applicable
Not applicable
Not applicable
RAW2
1 X means don’t care.
Table 18. Control Register Bit Descriptions
Bit Name
Description
D0
RDAC register write protect
0 = wiper position frozen to value in EEPROM memory
1 = allows update of wiper position through digital interface (default)
D1
EEPROM program enable
0 = EEPROM program disabled
1 = enables device for EEPROM program (default)
D2
Lineal setting mode/potentiometer mode
0 = potentiometer mode (default)
1 = linear gain setting mode



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