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DS1667

Digital Resistor with OP AMP

DS1667

021492 1/11

FEATURES

• Two digitally controlled 256-position potentiometers

• Serial port provides means for setting and reading

both potentiometers

• Resistors can be connected in series to provide addi-

tional resolution

• Default wiper position on power up is 50%

• Resistive elements are temperature compensated to

20% end to end

• Two high gain wide bandwidth operational amplifiers

• Low power CMOS design

• Applications include analog–to–digital and digital–to–

analog converters, variable oscillators, and variable

gain amplifiers

• 20–pin DIP package or optional 20–pin SOIC surface

mount package

• Operating temperature range of 0°C to 70°C

• Resistance Values

RESOLUTION -3 dB POINT

DS1667-10: 10K 39 ohms 1.1 MHz

DS1667-50: 50K 195 ohms 200 kHz

DS1667-100: 100K 390 ohms 100 kHz

PIN ASSIGNMENT

OUT0

SOUT

COUT

INVI

NINVI

NINV0

INV0

RST

CLK

OUT1

GND

20-Pin DIP (300 Mil) and 20-Pin SOIC

PIN DESCRIPTION

- +5 Volt Supply

GND - Ground

L0, L1 - Low End of Resistor

H0, H1 - High End of Resistor

W0, W1 - Wiper End of Resistor

- Substrate Bias and OP AMP

Negative Supply

SOUT - Wiper for Stacked

Configuration

RST

- Serial Port Reset Input

DQ - Serial Port Input/Output

CLK - Serial Port Clock Input

COUT - Cascade Serial Port Output

NINV0, NINVI - Noninverting OP AMP Input

INV0, INVI - Inverting OP AMP Input

OUT0, OUT1 - OP AMP Outputs

DESCRIPTION

The DS1667 is a dual–solid state potentiometer that is

adjustable by digitally selected resistive elements.

Each potentiometer is composed of 256 resistive ele-

ments. Between each resistive section of each poten-

tiometer are tap points accessible to the wiper. The po-

sition of the wiper on the resistive array is set by an 8–bit

wiper output. Each 8–bit register can be read or written

by sending or receiving data bits over a 3–wire serial

port. In addition, the resistors can be stacked such that

a single potentiometer of 512 sections results. When

two separate potentiometers are used, the resolution of

the DS1667 is equal to the resistance value divided by

256. When the potentiometers are stacked end to end,

the resistance value is doubled while the resolution re-

mains the same. The DS1667 also contains two high

gain wide bandwidth operational amplifiers. Each am-

plifier has both the inverting and non-inverting inputs

and the output available for user configuration. The op-

erational amplifiers can be paired with the resistive ele-

1 2 3 4 5 6 ... 10 11

Inhaltsverzeichnis

Seite 1 - Digital Resistor with OP AMP

Seite 2 - BLOCK DIAGRAM Figure 1

DS1667021492 10/11OPERATIONAL AMPLIFIER SECTIONAC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 5.0V ± 10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESSl

Seite 3 - 021492 3/11

DS1667021492 11/11LOAD SCHEMATIC Figure 8+5 VOLTS50 pFD.U.T.680 Ω1.1K

Seite 4 - WRITING DATA Figure 2

DS1667021492 2/11ments to perform such functions as analog to digitalconversion, digital to analog conversion, variable gainamplifiers, and variable o

Seite 5 - DS1667 LINEARITY MEASUREMENTS

DS1667021492 3/11Information is written to and read from the wiper 0 andwiper 1 registers and the stack select bit via the 17-bitI/O shift register.

Seite 6

DS1667021492 4/11WRITING DATA Figure 2RSTDQCLKI/O SRWIPER 0 & 1STACK SELECTPREVIOUS VALUENEW VALUENEW CONTROL REG.+0, 1+0DON’T CAREDON’T CARE BIT

Seite 7

DS1667021492 5/11READING DATA Figure 4RSTCLKCONTROLREGISTERSCURRENT SETTINGSNOBIT 16COUTBIT 15 BIT 14 BIT 0 BIT 16CHANGESDS1667 LINEARITY MEASUREMENT

Seite 8 - °C to 70°C)

DS1667021492 6/11LINEARITY MEASUREMENT CONFIGURATION Figure 5+5V–5VHXPOTXRWX+–V0I0 = 0LXWXX=0 POT0X=1 POT1DS1667 ABSOLUTE AND RELATIVE LINEARITY Fig

Seite 9 - O,SOURCE

DS1667021492 7/11TIMING DIAGRAM: RESISTOR SECTION Figure 7RSTCLKDQ INPUTSCOUTtHHTtWtHLTtWtHtHtSUtSUtPLH

Seite 10 - °C to 70°C; V

DS1667021492 8/11ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground (VB = GND) –0.5V to +7.0VVoltage on Resistor Pins when VB = -5.5V -5.5

Seite 11 - LOAD SCHEMATIC Figure 8

DS1667021492 9/11CAPACITANCE (tA = 25°C)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESInput Capacitance CIN5 pFOutput Capacitance COUT7 pFAC ELECTRICAL CHA

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