DS1868 Datasheet, PDF (1/14 Pages) Dallas Semiconductor – Dual Digital Potentiometer Chip

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DS1868
Dual Digital Potentiometer Chip
FEATURES
§ Ultra-lowpower consumption, quiet, pumpless
design
§ Two digitally controlled, 256-position
potentiometers
§ Serial port provides means for setting and
reading both potentiometers
§ Resistors can be connected in series to
provide increased total resistance
§ 20-pin TSSOP, 16-pin SOIC, and 14-pin DIP
packages are available.
§ Resistive elements are temperature
compensated to ±0.3 LSB relative linearity
§ Standard resistance values:
- DS1868-10 ∼ 10 kΩ
- DS1868-50 ∼ 50 kΩ
- DS1868-100 ∼ 100 kΩ
§ +5V or ±3V operation
§ Operating Temperature Range:
- Industrial: -40°C to 85°C
PIN ASSIGNMENT
VB
1
DNC
2
H1
3
L1
4
W1
5
RST
6
CLK
7
DNC
8
DNC
9
GND
10
20
VCC
19
DNC
18
DNC
17
SOUT
16
W0
15
H0
14
L0
13
COUT
12
DNC
11
DQ ^VB
1
20-Pin TSSOP (173-mil)
H1
2
14
VCC
13
SOUT
VB
1
16
VCC ^L1
3
NC
2
15
NC
H1
3
14
SOUT ^W1
4
L1
4
13
W0 _RST
5
W1
5
12
H0
RST
6
11
L0 CLK
6
CLK
7
10
COUT
GND
8
9
DQ ^GND
7
12
W0
11
H0
10
L0
9
COUT
8
DQ
DS1868S 16-Pin SOIC (300-mil)
14-Pin DIP (300-mil)
PIN DESCRIPTION
L0, L1
- Low End of Resistor
H0, H1
- High End of Resistor
W0, W1
- Wiper Terminal of Resistor
S_OUT
- Stacked Configuration Output
RST
- Serial Port Reset Input
DQ
- Serial Port Data Input
CLK
- Serial Port Clock Input
C_OUT
V_CC
GND
- Cascade Port Output
- +5 Volt Supply
- Ground Connections
NC
- No Internal Connection
V_B
DNC
- Substrate Bias Voltage
- Do Not Connect
*All GND pins must be connected to ground.
DESCRIPTION
The DS1868 Dual Digital Potentiometer Chip consists of two digitally controlled solid-state
potentiometers. Each potentiometer is composed of 256 resistive sections. Between each resistive section
and both ends of the potentiometer are tap points which are accessible to the wiper. The position of the
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