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LTC1279

12-Bit, 600ksps Sampling

A/D Converter with Shutdown

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FEATURE

DESCRIPTIO

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Single Supply 5V or

±5V Operation

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Sample Rate: 600ksps

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70dB S/(N + D) and 74dB THD at Nyquist

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Power Dissipation: 60mW Typ

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Power Shutdown with Instant Wake-Up

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Internal Reference Can Be Overdriven Externally

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Internal Synchronized Clock; No Clock Required

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High Impedance Analog Input

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Input Range: 0V to 5V or

±2.5V

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New Flexible, Friendly Parallel Interface Eases

Connections to DSPs and FIFOs

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24-Pin SO Wide Package

APPLICATI

TYPICAL

The LTC

µs, 600ksps, sampling 12-bit A/D

converter which draws only 60mW from a single 5V or

±5V supplies. This easy-to-use device comes complete

with a 160ns sample-and-hold, a precision reference and

an internally trimmed clock. Unipolar and bipolar conver-

sion modes add to the flexibility of the ADC. The low

power dissipation is reduced even more, drawing only

8.5mW in power shutdown mode. Instant wake-up from

power shutdown allows the converter to be powered

down even during brief inactive periods.

The LTC1279 converts 0V to 5V unipolar inputs from a

single 5V supply and

±2.5V bipolar inputs from ±5V

supplies. Maximum DC specs include

±1LSB INL and

±1LSB DNL. Outstanding guaranteed AC performance

includes 70dB S/(N + D) and 78dB THD at the input

frequency of 100kHz over temperature.

The internal clock is trimmed for 1.4

µs conversion time.

The clock automatically synchronizes to each sample

command, eliminating problems with asynchronous clock

noise found in competitive devices. A separate conversion

start input and a data-ready signal (BUSY) ease connec-

tions to FIFOs, DSPs and microprocessors.

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

Single 5V Supply, 600kHz, 12-Bit Sampling A/D Converter

Effective Bits and Signal-to-(Noise + Distortion)

vs Input Frequency

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2

3

4

5

6

7

8

9

10

11

12

24

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20

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16

15

14

13

AGND

D11(MSB)

D10

D9

D8

D7

D6

D5

D4

DGND

BUSY

CS

RD

CONVST

SHDN

D0

D1

D2

D3

LTC1279

+

0.1

µF

10

µF

2.42V

REFERENCE

OUTPUT

ANALOG INPUT

(0V TO 5V)

10

µF

0.1

µF

5V

12-BIT

PARALLEL

BUS

µP CONTROL

LINES

LTC1279 • TA01

+

CONVERSION-START INPUT

POWER SHUTDOWN INPUT

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APPLICATI

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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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Audio and Telecom Processing

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Spectrum Analysis

FREQUENCY (Hz)

10k

100k

1M

5M

1279 G03

12

11

10

9

8

7

6

5

4

3

2

1

0

74

68

62

56

50

NYQUIST

FREQUENCY