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DS1859E-020 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1859E-020 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 10 page Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors ______________________________________________ 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. General Description The DS1859 dual, temperature-controlled, nonvolatile (NV) variable resistors with three monitors consists of two 50k Ω or two 20kΩ, 256-position, linear, variable resistors; three analog monitor inputs (MON1, MON2, MON3); and a direct-to-digital temperature sensor. The device provides an ideal method for setting and tem- perature-compensating bias voltages and currents in control applications using minimal circuitry. The vari- able resistor settings are stored in EEPROM memory and can be accessed over the 2-wire serial bus. Applications Optical Transceivers Optical Transponders Instrumentation and Industrial Controls RF Power Amps Diagnostic Monitoring Features ♦ SFF-8472 Compatible ♦ Five Monitored Channels (Temperature, VCC, MON1, MON2, MON3) ♦ Three External Analog Inputs (MON1, MON2, MON3) That Support Internal and External Calibration ♦ Scalable Dynamic Range for External Analog Inputs ♦ Internal Direct-to-Digital Temperature Sensor ♦ Alarm and Warning Flags for All Monitored Channels ♦ Two 50kΩ or Two 20kΩ, Linear, 256-Position, Nonvolatile Temperature-Controlled Variable Resistors ♦ Resistor Settings Changeable Every 2°C ♦ Access to Monitoring and ID Information Configurable with Separate Device Addresses ♦ 2-Wire Serial Interface ♦ Two Buffers with TTL/CMOS-Compatible Inputs and Open-Drain Outputs ♦ Operates from a 3.3V or 5V Supply ♦ Operating Temperature Range of -40°C to +95°C Ordering Information Rev 1; 11/03 PART RESISTANCE PIN-PACKAGE DS1859E-050 50k Ω 16 TSSOP DS1859E-020 20k Ω 16 TSSOP DS1859E-050/T&R 50k Ω 16 TSSOP (Tape-and-Reel) DS1859E-020/T&R 20k Ω 16 TSSOP (Tape-and-Reel) DS1859B-050 50k Ω 16-Ball CSBGA DS1859B-020 20k Ω 16-Ball CSBGA A TOP VIEW B C D 1 CSBGA (4mm x 4mm) 1.0mm PITCH TSSOP 3 24 MON3 OUT1 IN2 MON1 L0 GND WPEN L1 H0 SDA OUT2 H1 VCC SCL IN1 MON2 DS1859 SDA 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 SCL OUT1 IN1 OUT2 IN2 WPEN GND VCC H1 L1 H0 L0 MON3 MON2 MON1 Pin Configurations DS1859 SDA 1 2 3 4 5 6 7 8 16 0.1 µF 15 14 13 12 11 10 9 SCL OUT1 IN1 OUT2 IN2 WPEN GND VCC H1 L1 H0 L0 MON3 MON2 MON1 GROUND TO DISABLE WRITE PROTECT Rx POWER* DIAGNOSTIC INPUTS TO LASER MODULATION CONTROL TO LASER BIAS CONTROL DECOUPLING CAP Tx POWER* Tx BIAS* *SATISFIES SFF-8472 COMPATIBILITY VCC VCC = 3.3V 4.7k Ω 4.7k Ω Tx-FAULT LOS 2-WIRE INTERFACE Typical Operating Circuit |
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