DS1843 19-4539 Rev 1 2/12 Fast Sample-and-Hold Circuit General Description Features The DS1843 is a sample-and-hold circuit useful for cap- Fast Sample Time < 300ns turing fast signals where board space is constrained. It Hold Time > 100s includes a differential, high-speed switched capacitor input sample stage, offset nulling circuitry, and an out- Low Input Offset put buffer. The DS1843 is optimized for use in optical Buffered Output line transmission (OLT) systems for burst-mode RSSI measurement in conjunction with an external sense Small, 8-Pin DFN (2mm x 2mm) Pb-Free Package resistor. Applications Ordering Information Gigabit Passive Optical Network (GPON) OLT PART TEMP RANGE PIN-PACKAGE Gigabit Ethernet Passive Optical Network (GEPON) OLT DS1843D+ -40C to +85C 8 DFN GPON Optical Network Unit DS1843D+TRL -40C to +85C 8 DFN Sample and Hold +Denotes a lead(Pb)-free/RoHS-compliant package. TRL = Tape and reel. Typical Operating Circuit SDA 2 I C DS1842/ SCL MAX4007 INTERFACE MAIN MEMORY V EEPROM/SRAM CC 3.3V A/D CONFIG/RESULTS, MON1 V CC DS1843 SYSTEM STATUS BITS, BMD ALARMS/WARNINGS, V INP V OUTP MON3P LOOKUP TABLES, USER MEMORY MON3N C IN C S V OUTN MOD R IN MON4 DAC 12-BIT C S ADC C IN TEMP BIAS V SENSOR INN 3.3V DAC SEN DEN SEN STROBE CONTROL STROBE LOGIC GND CONTROLLER Pin Configuration appears at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. ANALOG MUXFast Sample-and-Hold Circuit ABSOLUTE MAXIMUM RATINGS Voltage Range on V .............................................-0.5V to +6V Operating Temperature Range ...........................-40C to +85C CC Voltage Range on V , V , Storage Temperature Range .............................-55C to +125C OUTP OUTN V , V , SEN, DEN ............................-0.5V to (V + 0.5V)* Lead Temperature (soldering, 10s) .................................+300C INP INN CC Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) .......................................+260C A DFN (derate 4.8mW/C above +70C).....................380.6mW *Subject to not exceeding +6V. 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, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) +2.97 +5.5 V CC DC ELECTRICAL CHARACTERISTICS (V = +2.97V to +5.5V, T = -40C to +85C, unless otherwise noted.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I (Note 1) 5.7 9 mA CC Input Capacitance C All pins (Note 2) 7 pF IN Sample Capacitance C V and V (Note 2) 5 pF S INN INP 0.3 x Logic-Input Low V SEN and DEN inputs V IL V CC 0.7 x Logic-Input High V SEN and DEN inputs V IH V CC Input Leakage I V or V SEN = 0 1 A IN INN INP, Input Voltage V V = V - V 0 1.0 V IN IN INP INN V = V - V 100k load on OUT OUTP OUTN Output Voltage V 0 1.0 V OUT each output pin Output Impedance R (Note 2) 1 1.3 k OUTMAX Output Capacitive Load C Capacitance for stable operation 50 pF OUT V = 2.9V, 1s sample time, V = 6mV 3.6 6.1 mV Total Input Referenced Voltage CC IN V OS-DIFF Offset: Differential Voltco (V = 2.9V to 5.5V) 1 mV/V CC V = 2.9V, 1s sample time, V = 6mV 3.4 8 mV Total Input Referenced Voltage CC IN V OS-SE Offset: Single-Ended Voltco (V = 2.9V to 5.5V) 1 mV/V CC 2 DS1843