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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 @ 250碌A(chǔ) 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: 40碌S

Pin Compatible Upgrade to LTC 1298

DESCRIPTION

The

SP8538

is a very low power 12-Bit data acquisition chip. The

SP8538

typically draws 250碌A(chǔ)

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

漏 Copyright 1999 Sipex Corporation

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