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SP8538

Micropower Sampling 12-Bit A/D Converter

Signal Processing Technologies 

SIGNAL PROCESSING EXCELLENCE

SP8538

Micropower Sampling 12-Bit A/D Converter

s Low Cost

s 12-Bit Serial Sampling ADC

s Guaranteed +1.0 LSB Max INL

s Guaranteed No Missing Codes

s 8-Pin NSOIC Plastic Package

s Low Power @ 250µA including

Automatic Shutdown: 1nA(typ)

s Programmable Input Configuration:

Full differential or 2 channel

single-ended

s Single Supply 3.0V to 5.5V operation

s Half Duplex Digital Serial Interface

s Sample Rate: 40µS

s 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

CH0

CH1

DIN

MUX

INPUT

DATA

REG

REFL

DAC

REFH

Csample P

Csample N

COMPARATOR

SAR

PARALLEL TO

SERIAL SHIFT

REGISTER

Dout

CS

CLK

SP8538 Block Diagram

SP8538DS/01

TIMING &

CONTROL LOGIC

SP8538 Micropower Sampling 12-Bit A/D Converter

1

© Copyright 1999 Sipex Corporation

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