DS1882 Rev 0 6/06 Dual Log Audio Digital Potentiometer General Description Features Dual, Audio Log Taper Potentiometers The DS1882 is a dual, nonvolatile (NV) digital poten- tiometer designed to operate in audio systems that Low THD+N and Crosstalk accomodate up to 7V signal levels. The potentiometer 7V Analog Supply (Independent of Digital settings can be stored in EEPROM so that they are Supply) retained when the power is cycled. The DS1882 has 5V Digital Supply separate supplies for the potentiometers (V ) and the CC communication circuitry (V ). For clickless/popless Potentiometer Settings Configurable as DD operation, a zero-crossing detector allows the wiper Nonvolatile or Volatile position to change when there is no voltage across the Zero-Crossing Detector Eliminates Switching potentiometer. The DS1882 is also designed to mini- Noise mize crosstalk, and the two digital potentiometers pro- Two User-Configurable Attenuation Options vide 0.5dB channel-to-channel matching to prevent Configuration Option 1: 63 Positions Provide 1dB volume differences between channels. Total harmonic Attenuation Steps from 0dB to -62dB Plus Mute distortion (THD) is also minimal as long as the wiper Configuration Option 2: (Software-Compatible drives a high-impedance load. with the DS1808): 33 Positions Plus Mute as Two attenuation configuration options provide optimum Follows flexibility for the specific application. Configuration Positions 012: 1dB per Step for 12 Steps Option 1 provides 63 logarithmic tapered steps (0dB to Positions 1324: 2dB per Step for 12 Steps -62dB, 1dB/step) plus a mute setting. Configuration Positions 2532: 3dB per Step for 8 Steps Option 2 has 32 logarithmic steps plus mute and pro- 2 I C*-Compatible Serial Interface vides software compatibility with the DS1808. When Three Address Pins Allow Up to 8 Devices on Configuration Option 2 is used in combination with the 2 I C Bus 16-pin SO package, the DS1882 is both software and pin compatible with the DS1808 in 5V applications. 45k Potentiometer End-to-End Resistance Industrial Temperature Range (-40C to +85C) Applications 16-Pin TSSOP or SO Package Notebook and PC Audio Portable Audio Equipment Ordering Information Car Stereo TEMP VERSION PIN- PART Consumer Audio/Video RANGE (k ) PACKAGE 16 TSSOP Pin Configuration DS1882E-050+ -40C to +85C 45 (173 mils) TOP VIEW 16 TSS O P + GND 1 16 V DS1882E-050+T&R -40C to +85C 45 ( 173 mi l s) DD Tap e- and - Reel A2 2 15 V CC A1 3 14 SCL 16 SO DS1882Z-050+ -40C to +85C 45 ( 150 mi l s) V- 4 13 SDA A0 5 12 CE DS1882 16 SO DS1882Z-050+T&R -40C to +85C 45 ( 150 mi l s) W0 6 11 W1 Tap e- and - Reel L0 7 10 H1 +Denotes lead-free package. H08L91 TSSOP/SO Typical Operating Circuit appears at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Dual Log Audio Digital Potentiometer ABSOLUTE MAXIMUM RATINGS Voltage on V , SDA, and SCL Relative to GND .....-0.5V to +6.0V Maximum Resistor Current .................................................3mA DD Voltage on A2, A1, A0, and CE Relative Operating Temperature Range ...........................-40C to +85C to GND.................-0.5V to (V + 0.5V), not to exceed +6.0V Programming Temperature Range .........................0C to +70C DD Voltage on V Relative to GND...........................-0.5V to +8.0V Storage Temperature Range .............................-55C to +125C CC Voltage on H1, H0, W1, W0, L1, and L0 Relative Soldering Temperature...................See J-STD-020 Specification to GND............................................(V- - 0.5V) to (V + 0.5V) CC 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. RECOMMENDED OPERATING CONDITIONS (T = -40C to +85C) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V Digital Supply Voltage (Notes 1, 2) 4.5 5.5 V DD Analog Supply Range V (Notes 1, 2) 4.5 7.0 V CC V- Negative Supply Voltage (Notes 1, 2) -7.0 -4.5 V Potentiometer Voltages -V V V CC Wiper Current 1 mA DC ELECTRICAL CHARACTERISTICS (V = +4.5V to +5.5V, V = +4.5V to +7.0V, V- = -4.5V to -7.0V, T = -40C to +85C.) DD CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Digital Supply Current I (Note 3) 0.2 5 A DD Analog Supply Current I (Note 4) 2.5 10 A CC Input Logic 0 0.15 x V (Note 5) -0.3 V IL (CE, SDA, SCL, A0, A1, A2) V DD Input Logic 1 0.8 x V + DD V (Note 5) V IH (CE, SDA, SCL, A0, A1, A2) V 0.3 DD I = 4mA 0.4 OL Output-Voltage Low (SDA) V V OL I = 6mA 0.6 OL Input Leakage Current I -1 +1 A LI I/O Pin Input Current (SDA) 0.4V < V < (0.9 x V ) -10 +10 A SDA DD I/O Capacitance C (Note 6) 10 pF I/O Power-Up Time t 1ms PU 2 DS1882