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1400I

Complete SO-8, 12-Bit, 400ksps ADC with Shutdown

Linear Technology 

FEATURES

■ Complete 12-Bit ADC in SO-8

■ Single Supply 5V or ±5V Operation

■ Sample Rate: 400ksps

■ Power Dissipation: 75mW (Typ)

■ 72dB S/(N + D) and –80dB THD at Nyquist

■ No Missing Codes over Temperature

■ Nap Mode with Instant Wake-Up: 6mW

■ Sleep Mode: 30μW

■ High Impedance Analog Input

■ Input Range (1mV/LSB): 0V to 4.096V or ±2.048V

■ Internal Reference Can Be Overdriven Externally

■ 3-Wire Interface to DSPs and Processors (SPI and

MICROWIRETM Compatible)

U

APPLICATIO S

■ High Speed Data Acquisition

■ Digital Signal Processing

■ Multiplexed Data Acquisition Systems

■ Audio and Telecom Processing

■ Digital Radio

■ Spectrum Analysis

■ Low Power and Battery-Operated Systems

■ Handheld or Portable Instruments

TYPICAL APPLICATIO

Single 5V Supply, 400kHz, 12-Bit Sampling A/D Converter

5V

+

10µF

ANALOG INPUT

(0V TO 4.096V)

2.42V REFOUT +

10µF

VCC

VSS

0.1µF

LTC1400

AIN

CONV

MPU

P1.4

VREF

0.1µF GND

CLK

P1.3

DOUT

P1.2

SERIAL

DATA LINK

1400 TA01

LTC1400

Complete SO-8, 12-Bit,

400ksps ADC with

Shutdown

DESCRIPTIO

The LTC®1400 is a complete 400ksps, 12-bit A/D converter

which draws only 75mW from 5V or ±5V supplies. This

easy-to-use device comes complete with a 200ns sample-

and-hold and a precision reference. Unipolar and bipolar

conversion modes add to the flexibility of the ADC. The

LTC1400 has two power saving modes: Nap and Sleep.

In Nap mode, it consumes only 6mW of power and can

wake up and convert immediately. In the Sleep mode, it

consumes 30μW of power typically. Upon power-up from

Sleep mode, a reference ready (REFRDY) signal is available

in the serial data word to indicate that the reference has

settled and the chip is ready to convert.

The LTC1400 converts 0V to 4.096V unipolar inputs from

a single 5V supply and ±2.048V bipolar inputs from ±5V

supplies. Maximum DC specs include ±1LSB INL, ±1LSB

DNL and 45ppm/°C drift over temperature. Guaranteed AC

performance includes 70dB S/(N + D) and –76dB THD at

an input frequency of 100kHz, over temperature.

The 3-wire serial port allows compact and efficient data

transfer to a wide range of microprocessors, microcon-

trollers and DSPs.

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

All other trademarks are the property of their respective owners.

Power Consumption vs Sample Rate

100

NORMAL CONVERSION

10

NAP MODE

BETWEEN CONVERSION

1

0.1

0.01

0.001

0.01 0.1

SLEEP AND NAP MODE

BETWEEN CONVERSION

SLEEP MODE BETWEEN

CONVERSION

6.4MHz CLOCK

1 10 100 1k 10k 100k 1M

SAMPLE RATE (Hz)

1400 TA02

1400fa

1

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