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LTC1598

4- and 8-Channel, Micropower Sampling 12-Bit Serial I/O A/D Converters

Linear Technology 

LTC1594/LTC1598

4- and 8-Channel,

Micropower Sampling

12-Bit Serial I/O A/D Converters

FEATURES

■ 12-Bit Resolution

■ Auto Shutdown to 1nA

■ Low Supply Current: 320μA Typ

■ Guaranteed ±3/4LSB Max DNL

■ Single Supply 5V Operation

(3V Versions Available: LTC1594L/LTC1598L)

■ Multiplexer: 4-Channel MUX (LTC1594)

8-Channel MUX (LTC1598)

■ Separate MUX Output and ADC Input Pins

■ MUX and ADC May Be Controlled Separately

■ Sampling Rate: 16.8ksps

■ I/O Compatible with QSPI, SPI and MICROWIRETM, etc.

■ Small Package: 16-Pin Narrow SO (LTC1594)

2U4-Pin SSOP (LTC1598)

APPLICATIO S

■ Pen Screen Digitizing

■ Battery-Operated Systems

■ Remote Data Acquisition

■ Isolated Data Acquisition

■ Battery Monitoring

■ Temperature Measurement

DESCRIPTIO

The LTC®1594/LTC1598 are micropower, 12-bit sampling

A/D converters that feature 4- and 8-channel multiplexers,

respectively. They typically draw only 320μA of supply

current when converting and automatically power down to

a typical supply current of 1nA between conversions. The

LTC1594 is available in a 16-pin SO package and the

LTC1598 is packaged in a 24-pin SSOP. Both operate on

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

approximation ADCs include 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.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

24μW, 4-Channel, 12-Bit ADC Samples at 200Hz and Runs Off a 5V Supply

OPTIONAL

ADC FILTER

1k

1μF

5V

ANALOG

INPUTS

0V TO 5V

RANGE

20 CH0

21 CH1

22 CH2

23 CH3

24 CH4

1 CH5

2 CH6

3 CH7

18

MUXOUT

8-CHANNEL

MUX

8 COM

17

ADCIN

16

15, 19

VREF VCC

12-BIT

+ SAMPLING

ADC

–

CSADC

CSMUX

CLK

DIN

DOUT

1μF

10

6

5, 14

7

11

SERIAL DATA LINK

MICROWIRE AND

SPI COMPATABLE

MPU

GND

4, 9

12

NC

13

NC

1594/98 TA01

Supply Current vs Sample Rate

1000

100

TA = 25°C

VCC = 5V

VREF = 5V

fCLK = 320kHz

10

1

0.1

1

10

100

SAMPLE FREQUENCY (kHz)

1594/98 TA02

15948fb

1

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