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DS1666-010-DS1666-050-DS1666-10-DS1666-100-DS1666S-010-DS1666S-050
Audio Digital Resistor
DS1666, DS1666SAudio Digital Resistor
DS1666, DS1666S
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FEATURES128 position, digitally controlled potentiometerOperates from a +5 volts power supply with TTL sig-
nal inputsWide analog voltage range of ±5 voltsResistive elements are temperature compensated to
±20 percent end to endLow–power CMOS14–pin DIP or 16–pin SOIC for surface mount applica-
tionsDefault position on power up sets wiper position at
10%Operating temperature range–40°C to +85°C; industrial
Resolution/Step
Resistance valuesLow EndHigh End–3dB Point
DS1666–1010KΩ 24Ω152Ω1.1 MHz
DS1666–5050KΩ122Ω759Ω200 KHz
DS1666–100100KΩ243Ω1.519KΩ100 KHz
PIN ASSIGNMENTU/D
INC
GND
VCC
U/D
GND
VCC
14–PIN DIP (300 MIL)
See Mech. Drawings Section
16–PIN SOIC (300 MIL)
See Mech. Drawings Section
PIN DESCRIPTION–High Terminal of Resistor–Low Terminal of Resistor–Wiper Terminal of Resistor
U/D–Up/Down Control
INC–Wiper Movement Control–Chip Select for Wiper Movement–No Connection
VCC–+5 Volts
GND–Ground–0 to –5 Volts
DESCRIPTIONThe DS1666 is a solid–state potentiometer which is set
to value by digitally controlled resistive elements. The
potentiometer is composed of 127 resistive sections.
Between each resistive section and both ends of the po-
tentiometer are TAP points accessible to the wiper. The
position of the wiper on the resistance array is controlled
by the CS, U/D and INC inputs. The position of the wiper
defaults to the 10% position on power up. The resolu-
tion of the DS1666 is shown in Figure 1.
The DS1666 Digital Audio Resistor is uniquely designed
to provide a potentiometer that is logarithmic rather than
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.
DS1666, DS1666S
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GRAPH OF AUDIO TAPER Figure 1LOW TERMINALHIGH TERMINAL
PERCENT
RESIST
ANCE
% OF ACTIVE DIGITAL TAPS
OPERATIONThe CS, U/D and INC inputs control the position of the
wiper along the resistor array (Figure 1). When CS is ac-
tive (low), a high to low transition on the INC will incre-
ment or decrement an internal counter depending on the
level of the U/D pin. When the U/D pin is low, the counter
will decrement. When the U/D pin is high, the counter will
increment. The state of the U/D pin can be changed while
CS is active allowing for precise adjustment during cali-
bration. The output of the counter is decoded to set the
position of the wiper. When the CS input transitions to the
high (inactive) level, the value of the counter is stored and
the wiper position is maintained until power (VCC) is lost.
When power is restored, the DS1666 returns to the de-
fault setting and positions the wiper to 10 percent. The
value of the end–to–end and end–to–wiper position is in-
determinate while VCC is not applied.
The DS1666 has a resistor array that resembles an au-
dio taper potentiometer as shown in Figure 1 1. Since
the taper is not linear, exact resistance values for each
of the 128 positions of the resistor is not specified. How-
ever, the end-to-end resistance is specified to be within
±20 percent of the stated resistor value over an indus-
trial temperature range of –40°C to +85°C.
ANALOG CHARACTERISTICSEnd–to–End Resistance Tolerance = ±20 percent
Typical Noise = <120 dB/Hz REF:IV
Temperature Coefficient = ±800 PPM/°C typical
Resistance at tap #74=18% ± 2% of total resistance.
PIN DESCRIPTIONSThe high end of the potentiometer. This
terminal is capable of handling input volt-
ages between ±5 volts.The Low end of the potentiometer. This
terminal is capable of handling input volt-
ages between ±5 volts.The wiper terminal of the potentiometer.
The value of the wiper is controlled by the
U/D and the INC pins.
Up/DownThe U/D input controls the direc-
(U/D)tion of the wiper movement when setting
the potentiometer.
IncrementToggling INC will move the potentiome-
(INC)ter wiper by either incrementing or decre-
menting the counter.
Chip SelectThe device is selected when CS input is
(CS)low. The current counter value is stored
when CS is returned high.
DS1666, DS1666S
022698 3/7
BLOCK DIAGRAM Figure 2VH
U/D
INC
MODE SELECTION Figure 3
DS1666, DS1666S
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ABSOLUTE MAXIMUM RATINGS*Voltage on CS, INC, U/D, and VCC Relative to Ground–0.5V to +7.0V
Voltage on VH, VL, and VW Relative to Ground–6.5V to +6.5V
Voltage on VB–6.5V to Ground
Operating Temperature–40°C to +85°C
Storage Temperature–55°C to +125°C
Soldering Temperature260°C for 10 secondsThis is a stress rating only and functional operation of the device at these or any other conditions above those
indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS (–40°C to +85°C)
DC ELECTRICAL CHARACTERISTICS (–40°C to +85°C; VCC = 5.0V ± 10%)
CAPACITANCE (tA = 25°C)
DS1666, DS1666S
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AC ELECTRICAL CHARACTERISTICS (tA=–40°C to +85°C; VCC=+5V ± 10%)
AC TIMING Figure 4tIC
tCPH
tDI
INC
U/D
VVL
NOTES:All voltages are referenced to ground.This parameter is periodically sampled and not 100% tested.Typical values are for tA = 25°C and nominal supply voltages.Wiper output open circuited.
AC TEST CONDITIONSInput Pulse Levels0V to 3V
Input Rise and Fall Times10 ns
Input Level1.5V
DS1666, DS1666S
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DS1666 ORDERING INFORMATION
