SP8538

SP8538 SIGNAL PROCESSING EXCELLENCE Micropower Sampling 12-Bit A/D Converter s s s s s s s s s s s Low Cost 12-Bit Serial Sampling ADC Guaranteed +1.0 LSB Max INL Guaranteed No Missing Codes 8-Pin NSOIC Plastic Package Low Power @ 250µA including Automatic Shutdown: 1nA(typ) Programmable Input Configuration: Full differential or 2 channel single-ended Single Supply 3.0V to 5.5V operation Half Duplex Digital Serial Interface Sample Rate: 40µS Pin Compatible Upgrade to LTC 1298 DESCRIPTION The SP8538 is a very low power 12-Bit data acquisition chip. The SP8538 typically draws 250µA of supply current when sampling at 25 kHz. Supply current drops linearly as the sample rate is reduced. The ADC automatically powers down when not performing conversions, drawing only leakage current. The SP8538 is available in 8-Pin NSOIC packages, specified over Commercial and Industrial temperature ranges. The SP8538 is best suited for Battery-Operated Systems, Portable Data Acquisition Instrumentation, Battery Monitoring, and Remote Sensing applications. The serial port allows efficient data transfer to a wide range of microprocessors and microcontrollers over 3 or 4 wires. GND VCC REFL REFH Internal VCC 12 REFL DAC REFH Csample P CH0 PARALLEL TO SERIAL SHIFT REGISTER MUX CH1 COMPARATOR SAR Dout Csample N DIN INPUT DATA REG CS CLK TIMING & CONTROL LOGIC SP8538 Block Diagram SP8538DS/01 SP8538 Micropower Sampling 12-Bit A/D Converter © Copyright 1999 Sipex Corporation 1 ABSOLU...