Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer logarithmic Non-permanent TSSOP 14

1 of 10 030300

FEATURES

 Ultra-low power consumption

 Operates from 3V or 5V supplies

 Two digitally controlled, 65-position

potentiometers including mute

 Logarithmic resistive characteristics (1 dB

per step)

 Zero-crossing detection eliminates noise

caused by wiper movement

 Serial port provides means for setting and

reading both potentiometers wipers

 14-pin PDIP, 16-pin SOIC, and 14-pin

TSSOP packages

 Operating Temperature Range:

- Industrial: -40°C to +85°C

 Software mute

 Resistance available: 45 kΩ

PIN DESCRIPTION

L0, L1 - Low End of Resistor

H0, H1 - High End of Resistor

W0,W1 - Wiper End of Resistor

- 3V or 5V Power Supply Input

RST - Serial Port Reset Input

D - Serial Port Data Input

CLK - Serial Port Clock Input

GND - Digital Ground

AGND - Analog Ground

ZCEN - Zero-Crossing Detect Input

OUT

- Cascade Output

NC - No Connect

PIN ASSIGNMENT

DESCRIPTION

The DS1801 is a dual audio taper potentiometer having logarithmic resistive characteristics over the

device range. Each potentiometer provides 65 wiper positions with a 1 dB increment per step and device

mute. The 3-wire serial interface, using a CPU, provides the user the ability of reading or writing exact

wiper positions of the two potentiometers. Additionally, the part contains a zero-crossing detection

feature that minimizes noise resulting from wiper transitions. Packages for the part include a 14-pin

PDIP, 16-pin SOIC, and 14-pin TSSOP.

DS1801

Dual Audio Taper Potentiomete

www.dalsemi.com

GND 1 14 VCC

COUT 2 13 CLK

RST 3 12 D

ZCEN 4 11 AGND

W0 5 10 H1

L0 6 9 L1

H0 7 8 W1

DS1801 14-Pin PDIP (300-mil)

DS1801 14-Pin TSSOP (173-mil)

GND 1 16 VCC

COUT 2 15 CLK

RST 3 14 D

ZCEN 4 13 NC

NC 5 12 AGND

W0 6 11 H1

L0 7 10 L1

H0 8 9 W1

DS1801S 16-PIN SOIC (300-mil)

See Mech. Drawings Section

Summary of content (10 pages)

PAGE 1
DS1801 Dual Audio Taper Potentiometer www.dalsemi.
PAGE 2
DS1801 OPERATION The DS1801 provides two 65-position potentiometers per package, each having a logarithmic resistive characteristic as shown in Table 1. The DS1801 is controlled by a 3-wire serial interface. The 3-wire serial interface is designed for CPU-controlled applications and allows the potentiometer’s exact wiper position to be read or written. The DS1801 design supports daisy-chaining for multi-device environments. Figure 1 presents a block diagram of the DS1801.
PAGE 3
DS1801 3-WIRE SERIAL INTERFACE CONTROL Communication and control of the DS1801 is accomplished through a 3-wire serial port interface that drives an internal control logic unit. The 3-wire serial interface is designed for microprocessor or microcontroller applications. The interface consists of three input signals which include RST , CLK and D. The RST control signal is used to enable 3-wire serial port write operations.
PAGE 4
DS1801 TIMING DIAGRAMS Figure 3 4 of 10
PAGE 5
DS1801 CASCADE OPERATION A feature of the DS1801 is the ability to control multiple devices from a single processor. Multiple DS1801s can be linked or daisy-chained as shown in Figure 4. As a data bit is entered into the I/O shift register of the DS1801, bit 0 of the I/O shift register will appear at the COUT output after a maximum delay of 50 nanoseconds. The COUT output of the DS1801 can be used to drive the D input of another DS1801.
PAGE 6
DS1801 TYPICAL SUPPLY CURRENT VS.
PAGE 7
DS1801 ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature Soldering Temperature -0.7V to +7.0V -40° to +85°C; industrial -55°C to +125°C 260°C for 10 seconds * This 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.
PAGE 8
DS1801 ANALOG RESISTOR CHARACTERISTICS (-40°C to +85°C; VCC=2.7V to 5.5V) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES End to End Resistor Tolerance -20 +20 % 13 Absolute Tolerance -1 +1 dB 8 Interchannel Matching -0.5 +0.5 dB 4 Tap-to-Tap Tolerance -0.25 +0.
PAGE 9
DS1801 AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL MIN CLK Frequency fCLK DC Width of CLK Pulse tCH Data Setup Time (-40°C to +85°C; VCC=2.7V to 5.
PAGE 10
DS1801 DIGITAL OUTPUT LOAD Figure 6 INTERNAL GROUND CONNECTIONS Figure 7 NOTE: GND and AGND must be tied to the same voltage level.