DS1666S-100+T&R Maxim Integrated Products, DS1666S-100+T&R Datasheet - Page 2

• Manufacturer Part Number: DS1666S-100+T&R
• Description: IC DIG POT 100K 16SOIC
• Manufacturer: Maxim Integrated Products

Specifications of DS1666S-100+T&R

• Taps: 128
• Resistance (ohms): 100K
• Number Of Circuits: 1
• Temperature Coefficient: 750 ppm/°C Typical
• Memory Type: Volatile
• Interface: Increment/Decrement
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Resistance In Ohms: 100K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The DS1666 is uniquely designed to provide a potentiometer that is pseudo-logarithmic rather than linear
across its entire range. The lower half of the potentiometer advances 1% of total resistance for each 3%
of scale advanced, providing for precise amplification of low volume signals. The upper half of the
potentiometer advances 2% of resistance for every 1% of scale advanced, providing for the lower
resolution gain required for high volume amplification.
GRAPH OF AUDIO TAPER Figure 1
OPERATION
The DS1666 has a total of 128 tap-points including the V
segments exist between the V
whose position is controlled via a 3-terminal control port. A block diagram of the DS1666 is shown in
Figure 2.
The 3-terminal port of the DS1666 provides an increment/ decrement interface which is activated via a
chip select input. This interface consists of the input signals
control a 7-bit up/down counter. The output of the 7-bit up/down counter controls a 1 of 128 decoder to
select wiper position. The timing diagram for the 3-terminal interface control is shown in Figure 4.
ANALOG CHARACTERISTICS
The DS1666 has a pseudo-logarithmic resistor array that resembles an audio taper potentiometer as
shown in Figure 1. Taps on the lower portion of the potentiometer increment 0.25% of the total
resistance and are specified to within ±0.5% of the expected value. Taps on the higher portion increment
1.5% of the total resistance and are specified to within ±2.0% of the expected value.
End-to-End Resistance Tolerance = ±20 %
Temperature Coefficient = 750 PPM/°C typical
L
and V
H
terminals. These tap-points are accessible to the V
2 of 9
L
and V
CS
,
H
INC
terminals. A total of 127 resistive
, and U/
D
. These input signals
W
102899
terminal