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PDF DS1882 Data sheet ( Hoja de datos )
| Número de pieza | DS1882 | |
| Descripción | Dual Log Audio Digital Potentiometer | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 0; 6/06
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 (VCC) and the
communication circuitry (VDD). For clickless/popless
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
Applications
Pin Configuration
TOP VIEW
+
GND 1
A2 2
A1 3
V- 4
A0 5
DS1882
W0 6
L0 7
H0 8
16 VDD
15 VCC
14 SCL
13 SDA
12 CE
11 W1
10 H1
9 L1
Features
o Dual, Audio Log Taper Potentiometers
o Low THD+N and Crosstalk
o ±7V Analog Supply (Independent of Digital
Supply)
o 5V Digital Supply
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 I2C*-Compatible Serial Interface
o Three Address Pins Allow Up to 8 Devices on
I2C Bus
o 45kΩ Potentiometer End-to-End Resistance
o Industrial Temperature Range (-40°C to +85°C)
o 16-Pin TSSOP or SO Package
Ordering Information
PART
TEMP
RANGE
VERSION PIN-
(kΩ) PACKAGE
DS1882E-050+
-40°C to +85°C 45 16 TSSOP
(173 mils)
16 TSSOP
DS1882E-050+T&R -40°C to +85°C 45 (173 mils)
Tape-and-Reel
DS1882Z-050+
-40°C to +85°C
45
16 SO
(150 mils)
16 SO
DS1882Z-050+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 Log Audio Digital Potentiometer
Typical Operating Characteristics (continued)
(VDD = VCC = +5.0V, V- = -5.0V, TA = +25°C.)
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
-2.0
-2.5
-3.0
-3.5 POTENTIOMETER 0
-4.0
-4.5
-5.0
-40 -20 0 20 40
60
80
TEMPERATURE (°C)
RESISTANCE vs. POWER-UP VOLTAGE
100
HIGH IMPEDANCE
80
60
40
20
MUTE
PROGRAMMED
RESISTANCE (6dBh)
0
012345
POWER-UP VOLTAGE (V)
RESISTANCE
vs. POWER-DOWN VOLTAGE
100
HIGH IMPEDANCE
80
60
40
20
MUTE
PROGRAMMED
RESISTANCE (6dBh)
0
012345
POWER-DOWN VOLTAGE (V)
ICC vs. ZERO-CROSSING TIMING
1000
900
800 ZERO-CROSSING
700
DETECTION
ACTIVATED
600
ZERO-CROSSING
TIMEOUT OR ZERO-
CROSSING EVENT
500
400
300 TYPICAL
TIMEOUT
200 OF 50ms
100
0
TIME (ms)
0.0018
0.0016
0.0014
0.0012
0.0010
0.0008
0.0006
0.0004
0.0002
0
0.01
THD+N vs. FREQUENCY (0dB)
0.10 1.00 10.00
FREQUENCY (kHz)
100.00
CROSSTALK vs. FREQUENCY (-6dB)
0
-20
-40
-60
-80
-100
-120
-140
-160
0.01
0.10 1.00 10.00
FREQUENCY (kHz)
100.00
_____________________________________________________________________ 5
5 Page 
Dual Log Audio Digital Potentiometer
I2C Interface for the DS1882
The CE pin serves as a communication enable pin.
When active (CE = 0), the inputs SDA and SCL are rec-
ognized by the device. If inactive (CE = 1), pins SDA
and SCL are disabled, making I2C communication
impossible.
Three pins, A0, A1, A2, serve as slave address inputs.
For multidrop configurations, they allow eight such
devices to be addressed by the same I2C bus. If the
I2C address matches the hardware levels of these bits,
the DS1882 is allowed to receive communications from
the I2C bus.
The I2C slave address byte is shown below. This is the
first byte transmitted from the master to the DS1882.
The upper nibble value is fixed to 0101. Bit values A2,
A1, and A0 are determined by the states of the corre-
sponding pins. The LSB, R/W, determines whether a
read or write will be performed.
The next byte to be transmitted is the Command Byte
(see the Command Byte section for details).
0
MSB
1
SLAVE ADDRESS BYTE
0 1 A2 A1
A0 R/W
LSB
Reading Pot Values
As shown in Figure 1, the DS1882 provides one read
command operation. This operation allows the user to
read both Potentiometer Wiper Setting Registers and
the Configuration Register. To initiate a read operation,
the R/W bit of the slave address byte is set to 1.
Communication to read the DS1882 begins with a
START condition, which is issued by the master device.
The slave address byte sent from the master device fol-
lows the START condition. Once a matching slave
address byte has been received by the DS1882, the
DS1882 responds with an acknowledge. The master
can then begin to receive data. The value of the wiper
of Potentiometer 0 is the first returned from the DS1882.
It is 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. If desired, the master may stop the
communication transfer at this point by issuing the
STOP condition after the not acknowledge. However, if
the value of the three registers is needed again, the
transfer can continue by clocking the 8 bits of the
Potentiometer 0 value as described above.
SLAVE ADDRESS
BYTE
MSB LSB
0
1
0
1
A
2
A
1
A
0
1
R/W = 1
Figure 1. Read Protocol
READ PROTOCOL
COMMAND
BYTE
MSB LSB
COMMAND
BYTE
MSB LSB
0 0 POT-0
0 1 POT-1
DATA BYTES ARE READ IN THE ORDER SHOWN ABOVE.
MSB
10
COMMAND
BYTE
LSB
CONFIG
REG
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet DS1882.PDF ] | |
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