AD8400 Analog Devices, AD8400 Datasheet - Page 8

• Manufacturer Part Number: AD8400
• Description: Single-channel Digital Potentiometer
• Manufacturer: Analog Devices

AD8400/AD8402/AD8403
Pin
10
11
12
13
14
1
2
3
4
5
6
7
8
9
All AGNDs must be connected to DGND.
Name
AGND
B2
A2
W2
DGND
SHDN
CS
SDI
CLK
RS
V
W1
A1
B1
DD
AD8402 PIN FUNCTION DESCRIPTIONS
Description
Analog Ground
Terminal B RDAC #2
Terminal A RDAC #2
Wiper RDAC #2, Addr = 01
Digital Ground
Terminal A Open Circuit. Shutdown controls
Variable Resistors #1 and #2.
Chip Select Input, Active Low. When CS
returns high, data in the serial input register is
decoded based on the address bits and loaded
into the target DAC register.
Serial Data Input
Serial Clock Input, Positive Edge Triggered.
Active low reset to midscale; sets RDAC
registers to 80
Positive power supply, specified for operation
at both 3 V and 5 V.
Wiper RDAC #1, Addr = 00
Terminal A RDAC #1
Terminal B RDAC #1
AGND2
AGND4
PIN CONFIGURATIONS
AGND
DGND
DGND
SHDN
SHDN
GND
SDI
SDI
CS
W2
W2
W4
W4
B1
CS
CS
B2
A2
B2
A2
B4
A4
10
11
12
1
2
3
4
6
7
1
2
3
4
5
6
7
1
2
3
4
5
8
9
(Not to Scale)
(Not to Scale)
(Not to Scale)
TOP VIEW
TOP VIEW
TOP VIEW
AD8400
AD8402
AD8403
H
.
14
13
12
10
24
23
22
20
19
18
17
16
15
14
13
11
21
8
7
6
5
9
8
A1
W1
V
CLK
W1
V
RS
CLK
SDI
B1
A1
W1
AGND1
B3
A3
W3
AGND3
V
RS
CLK
SDO
B1
A1
DD
DD
DD
2
2
.
.
Pin
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
All AGNDs must be connected to DGND.
Name
B1
GND
CS
SDI
CLK
V
W1
A1
Name
AGND2
B2
A2
W2
AGND4
B4
A4
W4
DGND
SHDN
CS
SDI
SDO
CLK
RS
V
AGND3
W3
A3
B3
AGND1
W1
A1
B1
DD
DD
AD8400 PIN FUNCTION DESCRIPTIONS
AD8403 PIN FUNCTION DESCRIPTIONS
Description
Terminal B RDAC
Ground
Chip Select Input, Active Low. When CS
returns high, data in the serial input register
is loaded into the DAC register.
Serial Data Input
Serial Clock Input, Positive Edge Triggered.
Positive power supply, specified for operation
at both 3 V and 5 V.
Wiper RDAC, Addr = 00
Terminal A RDAC
Description
Analog Ground #2
Terminal B RDAC #2
Terminal A RDAC #2
Wiper RDAC #2, Addr = 01
Analog Ground #4
Terminal B RDAC #4
Terminal A RDAC #4
Wiper RDAC #4, Addr = 11
Digital Ground
Active Low Input. Terminal A open circuit.
Shutdown controls Variable Resistors #1
through #4.
Chip Select Input, Active Low. When CS
returns high, data in the serial input register
is decoded based on the address bits and
loaded into the target DAC register.
Serial Data Input
Serial Data Output, Open Drain transistor
requires pull-up resistor.
Serial Clock Input, Positive Edge Triggered
Active Low reset to midscale; sets RDAC
registers to 80
Positive power supply, specified for
operation at both 3 V and 5 V.
Analog Ground #3
Wiper RDAC #3, Addr = 10
Terminal A RDAC #3
Terminal B RDAC #3
Analog Ground #1
Wiper RDAC #1, Addr = 00
Terminal A RDAC #1
Terminal B RDAC #1
H
.
2
2
2
2
2
.
.