DS1802E/T&R; datasheet, PDF - EEWORLD Datasheet

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DS1802E/T&R;: DescriptionIC POT DL AUDIO TAP W/PB 20TSSOP; Categorysemiconductor Analog mixed-signal IC; File Size815KB，17 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1802E/T&R; Overview

IC POT DL AUDIO TAP W/PB 20TSSOP

DS1802E/T&R; Parametric

Parameter Name	Attribute value
cone	logarithm
Configuration	Potentiometer
Number of circuits	2
Number of taps	65
Resistance (ohms)	45k
interface	button, serial
memory type	Volatile
Voltage - Power	2.7 V ~ 5.5 V
characteristic	Cascade pin, mute, zero-crossing detection
Tolerance	±20%
Temperature coefficient (typ.)	750 ppm/°C
Resistance - Vernier (Ohms) (Typical)	400
Operating temperature	-40°C ~ 85°C
Package/casing	20-TSSOP (0.173", 4.40mm wide)
Supplier device packaging	20-TSSOP

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DS1802

Dual Audio Taper Potentiometer

With Pushbutton Control

www.dalsemi.com

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

Digital or mechanical pushbutton wiper

control

Serial port provides means for setting and

reading both potentiometers wipers

20-pin SOIC and 20-pin TSSOP for surface

mount applications

Operating Temperature Range:

-40°C to +85°C

Software and hardware mute

Resistance Available: 45 kΩ

PIN ASSIGNMENT

GND

COUT

CLK

RST

ZCEN

MODE

VCC

VU (UC1)

VD (DC1)

B0 (UC0)

B1 (DC0)

MUTE

AGND

20-Pin DIP (300-mil)

20-Pin SOIC (300-mil)

20-Pin TSSOP (173-mil)

See Mech. Drawings Section

PIN DESCRIPTION

L0, L1

H0, H1

W1,W2

RST

CLK

MODE

UC0, UC1

DC0, DC1

VU, VD

B0, B1

GND

MUTE

AGND

ZCEN

OUT

1 of 17

Low End of Resistor

High End of Resistor

Wiper End of Resistor

3V/5V Power Supply Input

Serial Port Reset Input

Serial Port Data Input

Serial Port Clock Input

Mode Select Input

Up Control Pushbutton Inputs

Down Control Pushbutton

Inputs

Volume-Up/Volume-Down

Inputs

Balance Pot-0, Pot-1 Inputs

Digital Ground

Mute

Analog Ground

Zero-Crossing Detect Input

Cascade Output

051401

DS1802

DESCRIPTION

The DS1802 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 DS1802 has two methods of device control, which include contact closure (pushbutton) inputs

and a 3-wire serial interface for wiper positioning. The pushbutton control inputs provide a simple

interface for device control without the need for a CPU. While the 3-wire serial interface, using a CPU,

provides the user the ability of reading or writing exact wiper positions of the two potentiometers. The

DS1802 can also be configured to operate in either independent or “stereo” modes when using pushbutton

control. Independent mode of operation allows for independent wiper control, and stereo mode of

operation provides single input control over both potentiometer wiper positions. The DS1802 is offered in

commercial temperature versions. Packages for the part include a 20-pin DIP, 20-pin SOIC, and 20-pin

TSSOP.

OPERATION

The DS1802 provides two 65-position potentiometers per package, each having a logarithmic resistive

characteristic as shown in Table 1. The DS1802 can be controlled either digitally or mechanically using a

3-wire serial interface or contact closure input, respectively. The pushbutton interface allows for a simple

mechanical control method for incrementing or decrementing wiper position. The 3-wire serial interface

is designed for CPU controlled applications and allows the potentiometer’s exact wiper position to be

read or written. Additionally, the DS1802 can be daisy-chained for multi-device environments.

Figure 1 presents a block diagram of the DS1802. As shown, the inputs from the 3-wire serial interface

and contact closure inputs drive a command/control unit. The command/control unit interprets these

inputs for control of the two potentiometers.

The MODE input is used for contact closure operation. This input allows the user to choose between

independent mode control and stereo mode control. The MODE input is discussed in detail under the

contact closure interface control.

On power-up the serial port is stable and active within 10 microseconds. The contact closure control

interface inputs are active after 50 ms. The wiper position on power-up will be at position 63, the low end

of the potentiometer. Position 64 is the mute level.

RESISTANCE CHARACTERISTICS

Table 1

POSITION

•

64(mute)

OUTPUT LEVEL (dB)

-1

-2

-3

-4

-5

•

-63

<-90

2 of 17

DS1802

Independent mode control allows the user to independently control each potentiometer's wiper position.

For independent mode control, the MODE input should be in a high state. For stereo mode control, the

MODE input should be in a low state. The input should always be tied to a well-defined logic state.

The contact closure inputs which affect independent mode control include UC0, UC1, DC0, and DC1. As

outlined in Table 2, the UC0 and UC1 inputs are used to move the potentiometers wipers towards the

high end of the potentiometer (H0, H1) terminals. The DC0 and DC1 inputs control movement towards

the low-end terminals (L0, L1). Note that UC0 and DC0 control potentiometer-0 wiper movement while

UC1 and DC1 control potentiometer-1 movement.

An additional feature of the contact closure interface is the ability to control both directions of wiper

movement with only the UC0 and UC1 contact closure inputs. This feature is referred to as single

pushbutton operation. Figure 2(a) and (b) illustrates both configurations for single pushbutton and dual

pushbutton operation.

Stereo Mode Control

Stereo mode control allows for the simultaneous positioning of both potentiometer wipers from a single

control input. Stereo mode control is entered when the MODE select input is in a low state at power-up.

The functionality available when operating in stereo mode control includes: 1) volume-up, 2) volume-

down, 3) balance-0, and 4) balance-1.

Volume Control Inputs

Volume-up and volume-down allow the user to move both wipers either up or down the resistor array

without changing the relative balance or distance between the wipers. For example, if potentiometer-0’s

wiper is set at position 28 and potentiometer-1’s wiper is set at position 20, the position distance of eight

is maintained when using either of these functions. Additionally, the balance between both wipers is

preserved if either reaches the end of its resistor array.

Balance Control Inputs

Balance control inputs allow the user to control the distance or offset between potentiometer-0 and

potentiometer-1 wiper position settings. The two input controls for balance include B0 and B1. The

balance control inputs attempt to minimize their respective wiper’s attenuation. When the DS1802 first

receives a balance control input, the position of the wiper closest to the high end terminal, H X , is stored.

Wiper position movement is then governed by this stored value.

For example, if the B0 input is used, the attenuation of potentiometer-0 will change only if it is greater

than the attenuation of potentiometer-1. The direction of movement for the potentiometer-0 wiper will be

towards the high end of the resistor array. Movement of wiper-0 will only stop once its value is equal to

that of wiper-1. At this point, continued input activity on the B0 input will cause an increase in

attenuation of potentiometer-1. Note that if the wiper of potentiometer-1 peaks at the bottom of its array,

continued B0 input activity will cause no change in the wiper positions of the device. A B1 input will be

required to change the balance of the two wipers if the potentiometer wiper peaks in this case.

In the case where both wiper positions are at position 63, no movement of the wipers will take place

when using the balance controlled inputs. A volume- up control input is required to move the wiper

positions from the bottom of the resistor arrays. Balance control operation is presented in Figure 3.

4 of 17

DS1802E/T&R; Related Products

	DS1802E/T&R;	DS1802S+	DS1802E+	DS1802+	DS1802E/T&R	DS1802E+T&R;
Description	IC POT DL AUDIO TAP W/PB 20TSSOP	digital potentiometer ics dual audio taper potentiometer	digital potentiometer ics dual audio taper potentiometer	digital potentiometer ics dual audio taper potentiometer	IC pot DL audio tap W/PB 20tssop	IC POT DL AUDIO TAP W/PB 20TSSOP
Is it lead-free?	-	Lead free	Lead free	Lead free	Contains lead	-
Is it Rohs certified?	-	conform to	conform to	conform to	incompatible	-
Maker	-	Maxim	Maxim	Maxim	Maxim	-
Parts packaging code	-	SOIC	TSSOP	DIP	TSSOP	-
package instruction	-	SOP, SOP20,.4	TSSOP, TSSOP20,.25	DIP, DIP20,.3	0.173 INCH, TSSOP-20	-
Contacts	-	20	20	20	20	-
Reach Compliance Code	-	compli	compli	compli	not_compliant	-
ECCN code	-	EAR99	EAR99	EAR99	EAR99	-
Other features	-	3-WIRE SERIAL CONTROL INTERFACE IS ALSO POSSIBLE	3-WIRE SERIAL CONTROL INTERFACE IS ALSO POSSIBLE	3-WIRE SERIAL CONTROL INTERFACE IS ALSO POSSIBLE	3-WIRE SERIAL CONTROL INTERFACE IS ALSO POSSIBLE	-
Nominal bandwidth	-	0.7 kHz	0.7 kHz	0.7 kHz	0.7 kHz	-
control interface	-	PUSH-BUTTON	PUSH-BUTTON	PUSH-BUTTON	PUSH-BUTTON	-
Converter type	-	DIGITAL POTENTIOMETER	DIGITAL POTENTIOMETER	DIGITAL POTENTIOMETER	DIGITAL POTENTIOMETER	-
JESD-30 code	-	R-PDSO-G20	R-PDSO-G20	R-PDIP-T20	R-PDSO-G20	-
JESD-609 code	-	e3	e3	e3	e0	-
length	-	12.8 mm	6.5 mm	26.16 mm	6.5 mm	-
Humidity sensitivity level	-	1	1	1	1	-
Number of functions	-	2	2	2	2	-
Number of positions	-	65	65	65	65	-
Number of terminals	-	20	20	20	20	-
Maximum operating temperature	-	85 °C	85 °C	85 °C	85 °C	-
Minimum operating temperature	-	-40 °C	-40 °C	-40 °C	-40 °C	-
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	-
encapsulated code	-	SOP	TSSOP	DIP	TSSOP	-
Encapsulate equivalent code	-	SOP20,.4	TSSOP20,.25	DIP20,.3	TSSOP20,.25	-
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	-
Package form	-	SMALL OUTLINE	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	IN-LINE	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	-
Peak Reflow Temperature (Celsius)	-	260	260	260	240	-
power supply	-	3/5 V	3/5 V	3/5 V	3/5 V	-
Certification status	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	-
resistance law	-	LOGARITHMIC	LOGARITHMIC	LOGARITHMIC	LOGARITHMIC	-
Maximum resistor tolerance	-	20%	20%	20%	20%	-
Maximum resistor terminal voltage	-	5.5 V	5.5 V	5.5 V	5.5 V	-
Minimum resistor terminal voltage	-	-0.5 V	-0.5 V	-0.5 V	-0.5 V	-
Maximum seat height	-	2.65 mm	1.1 mm	4.572 mm	1.1 mm	-
Nominal supply voltage	-	5 V	5 V	5 V	5 V	-
surface mount	-	YES	YES	NO	YES	-
Nominal temperature coefficient	-	750 ppm/°C	750 ppm/°C	750 ppm/°C	750 ppm/°C	-
Temperature level	-	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	-
Terminal surface	-	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Tin/Lead (Sn/Pb)	-
Terminal form	-	GULL WING	GULL WING	THROUGH-HOLE	GULL WING	-
Terminal pitch	-	1.27 mm	0.65 mm	2.54 mm	0.65 mm	-
Terminal location	-	DUAL	DUAL	DUAL	DUAL	-
Maximum time at peak reflow temperature	-	NOT SPECIFIED	30	30	20	-
Nominal total resistance	-	50000 Ω	50000 Ω	50000 Ω	50000 Ω	-
width	-	7.5 mm	4.4 mm	7.62 mm	4.4 mm	-

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