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DS1881 Datasheet

Download or read online Maxim Integrated DS1881 Dual NV Audio Taper Digital Potentiometer pdf datasheet.



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Rev 0; 1/06
Dual NV Audio Taper Digital Potentiometer
General Description
The DS1881 is a dual, nonvolatile (NV) digital poten-
tiometer designed to operate in audio systems that
require 5V signal levels. The potentiometer settings can
be stored in EEPROM so that they are retained when the
power is cycled. The DS1881 has separate supplies for
the potentiometers (V
) and the communication circuit-
CC
ry (V
). For clickless/popless operation, a zero-crossing
DD
detector allows the wiper position to change when there
is no voltage across the potentiometer. The device is
also designed to minimize crosstalk, and the two digital
potentiometers provide 0.5dB channel-to-channel match-
ing to prevent volume differences between channels.
Total harmonic distortion (THD) is also minimal as long
as the wiper drives a high-impedance load.
Two attenuation configuration options provide optimum
flexibility for the specific application. Configuration
Option 1 provides 63 logarithmic tapered steps (0dB to
-62dB, 1dB/step) plus a mute setting. Configuration
Option 2 has 32 logarithmic steps plus mute and pro-
vides software compatibility with the DS1808. When
Configuration Option 2 is used in combination with the
16-pin SO package, the DS1881 is both software and pin
compatible with the DS1808 in 5V applications.
Notebook and PC Audio
Portable Audio Equipment
Car Stereo
Consumer Audio/Video
Pin Configuration
TOP VIEW
+
GND
1
A2
2
A1
3
N.C.
4
DS1881
A0
5
W0
6
L0
7
H0
8
TSSOP/SO
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
♦ Dual, Audio Log Taper Potentiometers
♦ Low THD+N and Crosstalk
♦ 5V Analog Supply (Independent of Digital Supply)
♦ 3V to 5V Digital Supply Range
♦ Potentiometer Settings Configurable as NV
or Volatile
♦ Zero-Crossing Detector Eliminates Switching
Noise
♦ Two User-Configurable Attenuation Options
♦ Configuration Option 1: 63 Positions Provide 1dB
Attenuation Steps from 0dB to -62dB Plus Mute
♦ Configuration Option 2: (Software-Compatible
with the DS1808): 33 Positions Plus Mute as
Follows
Positions 0–12: 1dB per Step for 12 Steps
Positions 13–24: 2dB per Step for 12 Steps
Positions 25–32: 3dB per Step for 8 Steps
♦ I
2
C-Compatible Serial Interface
♦ Three Address Pins Allow Up to 8 Devices on
2
I
C Bus
♦ 45kΩ Potentiometer End-to-End Resistance
♦ Industrial Temperature Range (-40°C to +85°C)
Applications
♦ 16-Pin TSSOP or SO Package
PART
DS1881E-050+
16
V
DD
DS1881E-050+T&R -40°C to +85°C
15
V
CC
14
SCL
DS1881Z-050+
13
SDA
12
CE
11
W1
DS1881Z-050+T&R -40°C to +85°C
10
H1
+Denotes lead-free package.
9
L1
Typical Operating Circuit appears at end of data sheet.
______________________________________________ Maxim Integrated Products
Features
Ordering Information
TEMP
VERSION
PIN-
RANGE
(kΩ)
PACKAGE
16 TSSOP
-40°C to +85°C
45
(173 mils)
16 TS S O P
45
( 173 m i l s)
Tap e- and - Reel
16 S O
-40°C to +85°C
45
( 150 m i l s)
16 S O
( 150 m i l s)
45
Tap e- and - Reel
1

Summary of Contents

Page 1

... Option 2 has 32 logarithmic steps plus mute and pro- vides software compatibility with the DS1808. When Configuration Option 2 is used in combination with the 16-pin SO package, the DS1881 is both software and pin compatible with the DS1808 in 5V applications. Notebook and PC Audio Portable Audio Equipment ...

Page 2

... GND...-0.5V to 6.0V Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...

Page 3

Dual NV Audio Taper Digital Potentiometer ANALOG POTENTIOMETER CHARACTERISTICS (V 2.7V to 5.5V 4.5V to 5.5V PARAMETER End-to-End Resistance End-to-End Resistance Tolerance Ratiometric Temperature Coefficient End-to-End Resistance Temperature Coefficient Wiper Resistance Absolute Attenuation Tolerance ...

Page 4

... SDA SCL Note crossing detection has timed out. Note 5: The DS1881 will not obstruct the SDA and SCL lines not violate their minimum and maximum input voltage levels. Note 6: Guaranteed by design. Note 7: Above Position 50, these are typical maximum. Guaranteed by characterization. ...

Page 5

Dual NV Audio Taper Digital Potentiometer ( 5.0V 25°C POTENTIOMETER 0 (CONFIGURATON 1) ATTENUATION vs. SETTING 0 -20.0 -40.0 -60.0 -80.0 -100 SETTING (DEC) POTENTIOMETER ...

Page 6

Dual NV Audio Taper Digital Potentiometer ( 5.0V 25°C THDN vs. FREQUENCY (0dB) 0.0018 0.0016 0.0014 0.0012 0.0010 0.0008 0.0006 0.0004 0.0002 0 0.01 0.1 1 FREQUENCY (kHz) PIN NAME 1 GND ...

Page 7

... Dual NV Audio Taper Digital Potentiometer SDA SCL INTERFACE A0 CE POTENTIOMETER 0 VALUE H0 W0 ZERO-CROSSING L0 DETECTOR UPDATE ___ V DD CONFIGURATION REGISTER POTENTIOMETER SETTING DS1881 REGISTERS POTENTIOMETER 1 DECODER VALUE ZERO-CROSSING DETECTOR UPDATE Block Diagram GND GND ...

Page 8

... When the zero-crossing detec- tion feature is not enabled, the DS1881 will allow wiper movement as soon as the DS1881 has issued the acknowledge to the master-controlling device. ...

Page 9

Dual NV Audio Taper Digital Potentiometer Table 2. Configuration Option 2 TAP POSITION ATTENUATION (dB ...

Page 10

Dual NV Audio Taper Digital Potentiometer Potentiometer Wiper Setting are the values of the two MSBs of the Command Byte, then the wiper settings of the poten- tiometers are to be programmed. The lower 6 LSBs ...

Page 11

Dual NV Audio Taper Digital Potentiometer Configuration Register entered as the value of the two MSBs of the Command Byte, then the Configuration Register modified. The three LSBs of the Configuration CONFIGURATION REGISTER Factory ...

Page 12

... SLAVE ADDRESS BYTE Potentiometer 0 is the first returned from the DS1881 then followed by the value of Potentiometer 1 and then the value of the Configuration Register. Once the 8 bits of the Configuration Register have been sent, the master needs to issue an acknowledge, unless it is the last byte to be read, in which case the master issues a not acknowledge ...

Page 13

... Dual NV Audio Taper Digital Potentiometer Writing Command Byte Values An example of writing to the DS1881 is shown in Figure 2. The DS1881 has one write command that is used to change the Potentiometer Wiper Setting registers and the Configuration Register. All write operations begin with a START from the master, followed by a slave address byte ...

Page 14

Dual NV Audio Taper Digital Potentiometer setup time (see Figure 4) before the next rising edge of SCL during a bit read. The device shifts out each bit of data on SDA at the falling edge of the previous SCL ...

Page 15

... It is possible to take advantage of that phenomenon by repeatedly addressing the DS1881, which allows the next page to be written as soon as the DS1881 is ready to receive the data. The alternative to acknowledge polling is to wait for a maxi bus mum period of t again to the device ...

Page 16

... Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products is a registered trademark of Dallas Semiconductor Corporation. Heaney SDA is an open-collector output on the DS1881 that requires a pullup resistor to realize high logic levels. A master using either an open-collector output with a pullup resistor or a push-pull output driver can be uti- lized for SCL ...

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