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LTC1401

Complete

SO-8, 12-Bit, 200ksps

ADC with Shutdown

The LTC

verter that converts 0V to 2.048V unipolar input and draws

only 15mW from a single 3V supply. This easy-to-use

device comes complete with a 315ns sample-and-hold

and a precision reference. Maximum DC specifications

include

±1LSB INL, ±1LSB DNL and 45ppm/°C full-scale

drift over temperature.

The LTC1401 has three power saving modes: Nap and

Sleep, through the serial interface and Shutdown by

setting the SHDN pin to zero. In Nap mode, it consumes

only 1.5mW of power and can wake up and convert

immediately. In Sleep (Shutdown) mode, it consumes

19.5

µW (13.5µW) of power typically. Upon power-up

from Sleep or Shutdown mode, a reference ready (REFRDY)

signal is available in the serial word to indicate that the

reference has settled and the chip is ready to convert.

The 3-wire serial port allows compact and efficient data

transfer to a wide range of microprocessors, microcon-

trollers and DSPs.

FEATURES

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Complete 12-Bit ADC with Reference in SO-8

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Single Supply 3V Operation

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Sample Rate: 200ksps

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Power Dissipation: 15mW (Typ)

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68dB S/(N + D) and – 72dB THD at 50kHz

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No Missing Codes Over Temperature

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Nap Mode with Instant Wake-Up: 1.5mW

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Sleep Mode: 19.5

µW

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Shutdown Mode: 13.5

µW

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High Impedance Analog Input

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Input Range (0.5mV/LSB): 0V to 2.048V

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Internal Reference Can Be Overdriven Externally

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3-Wire Interface to DSPs and Processors (SPI and

MICROWIRE

Single 3V Supply, 200kHz, 12-Bit Sampling A/D Converter

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Low Power and Battery-Operated Systems

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Handheld or Portable Instruments

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High Speed Data Acquisition

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Digital Signal Processing

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Multiplexed Data Acquisition Systems

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Telecommunication

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Digital Radio

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Spectrum Analysis

GND

SHDN

CONV

CLK

P1.4

P1.3

P1.2

LTC1401

MPU

SERIAL

DATA LINK

+

0.1

µF

10

µF

+

0.1

µF

10

µF

1.20V

ANALOG INPUT

(0V TO 2.048V)

4

3

2

1

5

6

7

8

3V

1401 TA01

SAMPLE RATE (Hz)

0.01

1

10

100

10

1k

1M

LTC1401 • TA02

0.1

0.01

0.001

0.1

1

100

10k 100k

NORMAL CONVERSION

NAP MODE

BETWEEN CONVERSION

SHUTDOWN MODE

BETWEEN CONVERSION

SLEEP MODE BETWEEN

CONVERSION

3.2MHz CLOCK

Power Consumption vs Sample Rate

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

MICROWIRE is a trademark of National Semiconductor Corporation.