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DS1882 Datasheet

Download or read online Maxim Integrated DS1882 Dual Log Audio Digital Potentiometer pdf datasheet.



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Dual Log Audio Digital Potentiometer
General Description
The DS1882 is a dual, nonvolatile (NV) digital poten-
tiometer designed to operate in audio systems that
accomodate up to ±7V signal levels. The potentiometer
settings can be stored in EEPROM so that they are
retained when the power is cycled. The DS1882 has
separate supplies for the potentiometers (V
communication circuitry (V
). For clickless/popless
DD
operation, a zero-crossing detector allows the wiper
position to change when there is no voltage across the
potentiometer. The DS1882 is also designed to mini-
mize crosstalk, and the two digital potentiometers pro-
vide 0.5dB channel-to-channel matching 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 DS1882 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
V-
4
A0
5
DS1882
W0
6
L0
7
H0
8
TSSOP/SO
2
Purchase of I
C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
2
license under the Philips I
C Patent Rights to use these components in an I
Standard Specification as defined by Philips.
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.
o Dual, Audio Log Taper Potentiometers
o Low THD+N and Crosstalk
o ±7V Analog Supply (Independent of Digital
Supply)
o 5V Digital Supply
) and the
CC
o Potentiometer Settings Configurable as
Nonvolatile or Volatile
o Zero-Crossing Detector Eliminates Switching
Noise
o Two User-Configurable Attenuation Options
o Configuration Option 1: 63 Positions Provide 1dB
Attenuation Steps from 0dB to -62dB Plus Mute
o 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
o I
2
C*-Compatible Serial Interface
o Three Address Pins Allow Up to 8 Devices on
2
I
C Bus
o 45kΩ Potentiometer End-to-End Resistance
o Industrial Temperature Range (-40°C to +85°C)
Applications
o 16-Pin TSSOP or SO Package
DS1882E-050+
16
V
DS1882E-050+T&R -40°C to +85°C
DD
15
V
CC
14
SCL
DS1882Z-050+
13
SDA
12
CE
DS1882Z-050+T&R -40°C to +85°C
11
W1
10
H1
+Denotes lead-free package.
9
L1
Typical Operating Circuit appears at end of data sheet.
2
______________________________________________ Maxim Integrated Products
Ordering Information
TEMP
VERSION
PART
RANGE
(kΩ)
-40°C to +85°C
45
45
-40°C to +85°C
45
45
C system, provided that the system conforms to the I
Features
PIN-
PACKAGE
16 TSSOP
(173 mils)
16 TS S O P
( 173 m i l s)
Tap e- and - Reel
16 S O
( 150 m i l s)
16 S O
( 150 m i l s)
Tap e- and - Reel
2
C
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 DS1882 is both software and pin compatible with the DS1808 in 5V applications. Notebook and PC Audio Portable Audio Equipment ...

Page 2

... Voltage on V- Relative to GND ...-8.0V to 0.5V 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 Log Audio Digital Potentiometer ANALOG POTENTIOMETER CHARACTERISTICS (V 4.5V to 5.5V 4.5V to 7.0V -4.5V to -7.0V PARAMETER End-to-End Resistance End-to-End Resistance Tolerance Ratiometric Temperature Coefficient End-to-End Resistance Temperature Coefficient Wiper ...

Page 4

... SDA SCL Note crossing detection has timed out. Note 5: The DS1882 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 Log Audio Digital Potentiometer ( 5.0V -5.0V POTENTIOMETER 1 (CONFIGURATON 2) ATTENUATION vs. SETTING 0 -20.0 -40.0 -60.0 -80.0 -100 ...

Page 6

... CONFIGURATION REGISTER INTERFACE POTENTIOMETER SETTING REGISTERS DECODER VALUE ZERO-CROSSING ZERO-CROSSING DETECTOR Pin Description FUNCTION 2 C slave address of the device slave address of the device communication. Block Diagram GND V- DS1882 GND V- POTENTIOMETER 1 VALUE DETECTOR UPDATE ...

Page 7

... When the zero-crossing detec- tion feature is not enabled, the DS1882 will allow wiper movement as soon as the DS1882 has issued the acknowledge to the master-controlling device. ...

Page 8

Dual Log Audio Digital Potentiometer Table 2. Configuration Option 2 TAP POSITION ...

Page 9

Dual Log Audio 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 of ...

Page 10

Dual Log Audio 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 Default: ...

Page 11

... SLAVE ADDRESS BYTE Potentiometer 0 is the first returned from the DS1882 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 12

... Dual Log Audio Digital Potentiometer Writing Command Byte Values An example of writing to the DS1882 is shown in Figure 2. The DS1882 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 13

Dual Log Audio 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 pulse, ...

Page 14

... It is possible to take advantage of that phenomenon by repeatedly addressing the DS1882, which allows the next page to be written as soon as the DS1882 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 15

... Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ___ 15 © 2006 Maxim Integrated Products is a registered trademark of Dallas Semiconductor Corporation. Springer SDA is an open-collector output on the DS1882 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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