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SP8537DS/03

SP8537 Micropower Sampling 10–Bit Voltage A/D Converter

© Copyright 2000 Sipex Corporation

SP8537

Micropower Sampling 10-Bit A/D Converter

s Low Cost

s 10-Bit Serial Sampling ADC

s 8-Pin NSOIC Plastic Package

s Low Power @ 250

µA 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: 33.9

µS

DESCRIPTION

The SP8537 is a very low power 10-Bit data acquisition chip. TheSP8537 typically draws 250

µA

of supply current when sampling at 29.5 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 SP8537 is available in 8-Pin NSOIC packages, specified over Commercial,

Industrial and Extended temperature ranges. The SP8537 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.

Internal

VCC

VCC

REFH

GND

REFL

DAC

REFL

Csample P

Csample N

INPUT

DATA

REG

CH0

CH1

DIN

SAR

PARALLEL TO

SERIAL SHIFT

REGISTER

10

CS

CLK

TIMING &

CONTROL LOGIC

Dout

REFH

COMPARATOR

MUX

SP8537 Block Diagram

®