DS3902 Rev 1 2/06 Dual, NV, Variable Resistors with User EEPROM General Description Features Dual 256-Position Linear Digital Resistors The DS3902 features a dual, nonvolatile (NV), low tem- perature-coefficient, variable digital resistor with 256 Available as 50k/30k or 50k/15k user-selectable positions. The DS3902 can operate Resistor Settings Stored in NV Memory over a wide supply range of 2.4V to 5.5V, and commu- 2 Low Temperature Coefficient nication with the device is achieved through an I C 2 compatible serial interface. Internal address settings I C-Compatible Serial Interface allow the DS3902 slave address to be programmed to Wide Operating Voltage (2.4V to 5.5V) one of 128 possible addresses. The low cost and the Software Write Protection small size of the DS3902 make it an ideal replacement User-EEPROM Memory for conventional mechanical-trimming resistors. Programmable Slave Address Operating Temperature Range: -40C to +95C Small 8-Pin SOP Package Applications Optical Transceivers Ordering Information Optical Transponders Instrumentation and Industrial Controls RESISTOR TOP PIN- PART VALUES RF Power Amps MARK PACKAGE (R0, R1) Audio Power-Amp Biasing DS3902U-530 30k, 50k 3902A 8 SOP Replacement for Mechanical Variable Resistors DS3902U-515 15k, 50k 3902B 8 SOP and DIP Switches Ordering Information continued at end of data sheet. Typical Operating Circuit V CC V CC IN+ 0.1F V CC IN- TX DISABLE 4.7k 4.7k OUT- TX FAULT DS3902 2 SCL BIAS SET BIASMAX 2-WIRE OUT+ LASER H0 MASTER SDA 2 APCSET DRIVER IC MOD SET H1 BIAS+ 2 V MODSET CC 1 ADD SEL BIAS- PC MON GND BS MON MD NOTES: 1. WITH ADD SEL TIED TO GND, THE SLAVE ADDRESS WILL BE A2H. 2. FOR A DETAILED APPLICATION DIAGRAM OF A SPECIFIC LD, CONSULT THE LASER DRIVER DATA SHEET. Pin Configuration 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, NV, Variable Resistors with User EEPROM ABSOLUTE MAXIMUM RATINGS Voltage Range on V , SDA, SCL, H0, Operating Temperature Range ...........................-40C to +95C CC and H1 Relative to Ground................................-0.5V to +6.0V Programming Temperature Range .........................0C to +70C Voltage Range on ADD SEL Relative Storage Temperature Range .............................-55C to +125C to Ground ...............-0.5V to (V + 0.5V), not to exceed 6.0V Soldering Temperature ...............................................See IPC/JEDEC CC Resistor Current ....................................................................3mA J-STD-020A Specification 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 DC OPERATING CONDITIONS (T = -40C to +95C) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) +2.4 +5.5 V CC Input Logic 1 0.7 x V + CC V V IH (SDA, SCL, ADD SEL) V 0.3 CC Input Logic 0 +0.3 x V -0.3 V IL (SDA, SCL, ADD SEL) V CC Resistor Inputs H0, H1 -0.3 +5.5 V Resistor Current I 3mA RES DC ELECTRICAL CHARACTERISTICS (V = +2.4V to +5.5V, T = -40C to +95C, unless otherwise noted.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Standby Current I (Note 2) 200 A STBY Input Leakage I -1 +1 A L V 3mA sink current 0 0.4 OL1 Low-Level Output Voltage (SDA) V V 6mA sink current 0 0.6 OL2 ANALOG RESISTOR CHARACTERISTICS (V = +2.4V to +5.5V, T = -40C to +95C, unless otherwise noted.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Resistance Tolerance T = +25C -20 +20 % A Position 0 Resistance 160 250 Absolute Linearity (Note 3) -1 +1 LSB Relative Linearity (Note 4) -0.75 +0.75 LSB Temperature Coefficient At position FFh. (Notes 5, 6) -300 +300 ppm/C High-Impedance Resistor Current I H0, H1 = V -1 +1 A RHIZ CC 2 DS3902