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PDF DS1881 Data sheet ( Hoja de datos )
| Número de pieza | DS1881 | |
| Descripción | Dual NV Audio Taper Digital Potentiometer | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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 (VCC) and the communication circuit-
ry (VDD). For clickless/popless operation, a zero-crossing
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
Applications
Pin Configuration
TOP VIEW
+
GND 1
A2 2
A1 3
N.C. 4
A0 5
DS1881
W0 6
L0 7
H0 8
16 VDD
15 VCC
14 SCL
13 SDA
12 CE
11 W1
10 H1
9 L1
Features
♦ 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
♦ I2C*-Compatible Serial Interface
♦ Three Address Pins Allow Up to 8 Devices on
I2C Bus
♦ 45kΩ Potentiometer End-to-End Resistance
♦ Industrial Temperature Range (-40°C to +85°C)
♦ 16-Pin TSSOP or SO Package
Ordering Information
PART
TEMP
RANGE
VERSION PIN-
(kΩ) PACKAGE
DS1881E-045+
-40°C to +85°C
45
16 TSSOP
(173 mils)
16 TSSOP
DS1881E-045+T&R -40°C to +85°C 45 (173 mils)
Tape-and-Reel
DS1881Z-045+
-40°C to +85°C
45
16 SO
(150 mils)
16 SO
DS1881Z-045+T&R -40°C to +85°C 45 (150 mils)
Tape-and-Reel
+Denotes lead-free package.
TSSOP/SO
Typical Operating Circuit appears at end of data sheet.
Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
Standard Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
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.
1 page  
Dual NV Audio Taper Digital Potentiometer
(VDD = VCC = +5.0V, TA = +25°C.)
Typical Operating Characteristics (continued)
POTENTIOMETER 0 (CONFIGURATON 1)
ATTENUATION vs. SETTING
0
POTENTIOMETER 0 (CONFIGURATON 2)
ATTENUATION vs. SETTING
0
POTENTIOMETER 1 (CONFIGURATON 1)
ATTENUATION vs. SETTING
0
-20.0 -20.0 -20.0
-40.0 -40.0 -40.0
-60.0 -60.0 -60.0
-80.0 -80.0 -80.0
-100.0
0
9 18 27 36 45 54 63
SETTING (DEC)
-100.0
0 3 6 9 12 15 18 21 24 27 30 33
SETTING (DEC)
-100.0
0
9 18 27 36 45 54 63
SETTING (DEC)
POTENTIOMETER 1 (CONFIGURATON 2)
ATTENUATION vs. SETTING
0
-20.0
-40.0
-60.0
-80.0
-100.0
0 3 6 9 12 15 18 21 24 27 30 33
SETTING (DEC)
END-TO-END RESISTANCE PERCENT
CHANGE FROM +25°C vs. TEMPERATURE
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5 POTENTIOMETER 1
-1.0
-1.5 POTENTIOMETER 0
-2.0
-2.5
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
RESISTANCE vs. POWER-UP VOLTAGE
100
HIGH IMPEDANCE
80
60
40
MUTE WHILE
20 EEPROM
LOADS
PROGRAMMED
RESISTANCE (-6dB)
0
012345
POWER-UP VOLTAGE (V)
RESISTANCE
vs. POWER-DOWN VOLTAGE
100
80
60
40
20
MUTE
PROGRAMMED
RESISTANCE (-6dB)
0
012345
POWER-UP VOLTAGE (V)
SUPPLY CURRENT
vs. ZERO-CROSSING TIMING
1000
900
800
700 ZERO-CROSSING
600
DETECTION
ACTIVATED
500
ZERO-CROSSING
TIMEOUT OR ZERO-
CROSSING EVENT
400
300
200
TYPICAL
TIMEOUT
100 OF 50ms
0
TIME (ms)
_____________________________________________________________________ 5
5 Page 
Dual NV Audio Taper Digital Potentiometer
Configuration Register
If 10 is entered as the value of the two MSBs of the
Command Byte, then the Configuration Register is to
be modified. The three LSBs of the Configuration
CONFIGURATION REGISTER
Factory Default:
Memory Type:
87h
NV (EEPROM)
Register control the NV/volatile wiper setting, the zero-
crossing detection feature, and the potentiometer atten-
uation configuration.
1
0
X
X
X
V/NV
CONTROL
ZERO-
CROSSING
POT
CONFIG
b7 b6 b5 b4 b3 b2 b1 b0
bits 7, 6
bits 5, 4, 3
bit 2
bit 1
bit 0
Configuration Selection: When bit 7 is set to a 1 and bit 6 is set to a 0, the following configuration bits can be set
and stored in EEPROM.
These bits have no function.
Volatile/Nonvolatile Potentiometer Register Control Bit: A control bit that sets the potentiometer registers to be
either volatile or nonvolatile memory.
0 = Potentiometer registers are set to nonvolatile memory storage.
1 = Potentiometer registers are set to volatile memory storage. On power-up, the potentiometer wipers are in the
mute position (default).
Zero-Crossing Detection Enable Bit: A bit used to enable and disable the zero-crossing functionality.
0 = Zero-crossing detection is disabled.
1 = Zero-crossing detection is enabled (default).
Potentiometer Position Configuration: A control bit used to select the number of positions both potentiometers
have.
0 = Potentiometers have 63 positions and mute.
1 = Potentiometers have 33 positions and mute (default).
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet DS1881.PDF ] | |
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