DS1843

DS1843 19-4539; Rev 1; 2/12 Fast Sample-and-Hold Circuit General Description The DS1843 is a sample-and-hold circuit useful for capturing fast signals where board space is constrained. It includes a differential, high-speed switched capacitor input sample stage, offset nulling circuitry, and an output buffer. The DS1843 is optimized for use in optical line transmission (OLT) systems for burst-mode RSSI measurement in conjunction with an external sense resistor. Applications Gigabit Passive Optical Network (GPON) OLT Gigabit Ethernet Passive Optical Network (GEPON) OLT GPON Optical Network Unit Sample and Hold Features o Fast Sample Time < 300ns o Hold Time > 100µs o Low Input Offset o Buffered Output o Small, 8-Pin µDFN (2mm x 2mm) Pb-Free Package Ordering Information PART TEMP RANGE PIN-PACKAGE DS1843D+ -40°C to +85°C 8 µDFN DS1843D+TRL -40°C to +85°C 8 µDFN +Denotes a lead(Pb)-free/RoHS-compliant package. TRL = Tape and reel. Typical Operating Circuit DS1842/ MAX4007 3.3V VCC VINP CIN RIN CIN VINN DS1843 CS CS STROBE SEN GND CONTROL LOGIC SDA I2C SCL INTERFACE VCC VOUTP VOUTN MON1 BMD MON3P MON3N MON4 TEMP 3.3V SENSOR DEN STROBE SEN ANALOG MUX MAIN MEMORY EEPROM/SRAM A/D CONFIG/RESULTS, SYSTEM STATUS BITS, ALARMS/WARNINGS, LOOKUP TABLES, USER MEMORY 12-BIT ADC MOD DAC BIAS DAC CONTROLLER Pin Configuration appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, d...