DS1666, DS1666S
DS1666, DS1666S
Audio Digital Resistor
FEATURES
PIN ASSIGNMENT
• 128 position, digitally controlled potentiometer
NC
U/D
INC
CS
1
2
3
4
5
6
7
14
13
12
11
10
9
NC
• Operates from a +5 volts power supply with TTL sig-
V
V
V
V
V
CC
B
nal inputs
• Wide analog voltage range of ±5 volts
W
H
GND
NC
• Resistive elements are temperature compensated to
±20 percent end to end
L
NC
8
NC
• Low–power CMOS
14–PIN DIP (300 MIL)
See Mech. Drawings Section
• 14–pinDIPor16–pinSOICforsurfacemountapplica-
U/D
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
tions
NC
NC
V
B
• Default position on power up sets wiper position at
10%
INC
NC
V
V
W
H
CS
NC
NC
• Operating temperature range
NC
–
–40°C to +85°C; industrial
GND
V
L
16–PIN SOIC (300 MIL)
See Mech. Drawings Section
Resolution/Step
Resistance values Low End High End –3dB Point
DS1666–10 10KΩ
DS1666–50 50KΩ
DS1666–100100KΩ 243Ω
24Ω
122Ω
152Ω
759Ω
1.519KΩ 100 KHz
1.1 MHz
200 KHz
PIN DESCRIPTION
V
V
V
–
–
–
–
–
–
–
–
–
–
High Terminal of Resistor
Low Terminal of Resistor
Wiper Terminal of Resistor
Up/Down Control
H
L
W
U/D
INC
CS
Wiper Movement Control
Chip Select for Wiper Movement
No Connection
NC
V
CC
+5 Volts
GND
Ground
V
B
0 to –5 Volts
DESCRIPTION
The DS1666 is a solid–state potentiometer which is set
to value by digitally controlled resistive elements. The
potentiometer is composed of 127 resistive sections.
Betweeneach resistive section and both ends of the po-
tentiometerare TAP points accessible to the wiper. The
positionofthewiperontheresistancearrayiscontrolled
bytheCS, U/DandINCinputs. Thepositionofthewiper
defaults to the 10% position on power up. The resolu-
tion of the DS1666 is shown in Figure 1.
TheDS1666DigitalAudioResistorisuniquelydesigned
toprovideapotentiometerthatislogarithmicratherthan
linear across its entire range. The lower half of the po-
tentiometer advances 1% of total resistance for each
3% of scale advanced, providing for precise amplifica-
tion of low volume signals. The upper half of the poten-
tiometer advances 2% of resistance for every 1% of
scale advanced, providing for the lower resolution gain
required for high volume amplification.
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