DS1667 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1667

Digital Resistor with OP AMP

Dallas Semiconductor -> Maxim Integrated 

DS1667

Digital Resistor with OP AMP

www.dalsemi.com

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 additional 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

- Commercial: 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

NINV0

1

INV0

2

VB

3

W1 4

H1 5

L1 6

RST 7

CLK

8

OUT1 9

GND 10

20

VCC

19 OUT0

18 SOUT

17 W0

16 H0

15 L0

14 COUT

13 DQ

12 INVI

11 NINVI

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

See Mech. Drawings Section

PIN DESCRIPTION

VCC

GND

- +5-Volt Supply

- Ground

L0, L1

- Low End of Resistor

H0, H1

- High End of Resistor

W0, W1

- Wiper End of Resistor

VB

- 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 elements. Between each resistive section of each

potentiometer are tap points accessible to the wiper. The position of the wiper on the resistive array is set

by an 8-bit register that controls which tap point is connected to the 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 remains the

1 of 10

032000

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