1

LTC1598

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12-Bit Resolution

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Auto Shutdown to 1nA

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Low Supply Current: 320

µA Typ

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Guaranteed

±3/4LSB Max DNL

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Single Supply 5V Operation

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8-Channel Multiplexer

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Separate MUX Output and ADC Input Pins

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MUX and ADC May Be Controlled Separately

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Sampling Rate: 16.8ksps

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I/O Compatible with SPI, MICROWIRE

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24-Pin SSOP Package

The LTC

sampling A/D converter. It typically draws only 320

µA

of supply current when converting and automatically

powers down to typically 1nA between conversions. The

LTC1598 is available in a 24-pin SSOP package and

operates on a 5V supply. The 12-bit, switched-capacitor,

successive approximation ADC includes an 8-channel

MUX and a sample-and-hold.

On-chip serial ports allow efficient data transfer to a wide

range of microprocessors and microcontrollers over three

or four wires. This, coupled with micropower consump-

tion, makes remote location possible and facilitates trans-

mitting data through isolation barriers.

The circuit can be used in ratiometric applications or with

an external reference. The high impedance analog inputs

and the ability to operate with reduced spans (to 1.5V full

scale) allow direct connection to sensors and transducers

in many applications, eliminating the need for gain stages.

8-Channel, Micropower

Sampling 12-Bit Serial

I/O A/D Converter

August 1996

FEATURES

Final Electrical Specifications

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

, LTC and LT are registered trademarks of Linear Technology Corporation.

MICROWIRE is a trademark of National Semiconductor Corporation.

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Pen Screen Digitizing

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Battery-Operated Systems

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Remote Data Acquisition

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Isolated Data Acquisition

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Battery Monitoring

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Temperature Measurement

24

µW, 8-Channel, 12-Bit ADC Samples at 200Hz and Runs Off a 5V Supply

ANALOG

INPUTS

0V TO 5V

RANGE

1k

1

µF

LTC1598 • TA01

OPTIONAL

ADC FILTER

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

20

21

22

23

24

1

2

3

+

–

8-CHANNEL

MUX

8

COM

GND

4, 9

MPU

SERIAL DATA LINK

MICROWIRE AND

SPI COMPATABLE

10

6

5, 14

7

11

CS ADC

CS MUX

CLK

12

13

NC

NC

12-BIT

SAMPLING

ADC

ADCIN

MUXOUT

18

17

16

15, 19

1

µF

5V

Supply Current vs Sample Rate

SAMPLE FREQUENCY (kHz)

0.1

1

10

100

1000

1

10

100

1598 TA02