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LTC1419

14-Bit, 800ksps Sampling

A/D Converter with Shutdown

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FEATURE

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Sample Rate: 800ksps

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Power Dissipation: 150mW

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81.5dB S/(N + D) and 93dB THD

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No Missing Codes

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No Pipeline Delay

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Nap and Sleep Shutdown Modes

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Operates with 2.5V Internal 15ppm/

°C

Reference or External Reference

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True Differential Inputs Reject Common Mode Noise

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20MHz Full-Power Bandwidth Sampling

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Bipolar Input Range:

±2.5V

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28-Pin SSOP and SO Packages

DESCRIPTIO

The LTC

µs, 800ksps, 14-bit sampling

A/D converter that draws only 150mW from

±5V supplies.

This easy-to-use device includes a high dynamic range

sample-and-hold and a precision reference. Two digitally

selectable power shutdown modes provide flexibility for

low power systems.

The LTC1419 has a full-scale input range of

±2.5V. Out-

standing AC performance includes 81.5dB S/(N + D) and

93dB THD with a 100kHz input; 80dB S/(N + D) and 86dB

THD at the Nyquist input frequency of 400kHz.

The unique differential input sample-and-hold can acquire

single-ended or differential input signals up to its 20MHz

bandwidth. The 60dB common mode rejection allows

users to eliminate ground loops and common mode noise

by measuring signals differentially from the source.

The ADC has a

µP compatible, 14-bit parallel output port.

There is no pipeline delay in the conversion results. A

separate convert start input and data ready signal (BUSY)

ease connections to FIFOs, DSPs and microprocessors.

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APPLICATI

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Telecommunications

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Digital Signal Processing

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Multiplexed Data Acquisition Systems

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High Speed Data Acquisition

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Spectrum Analysis

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Imaging Systems

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

APPLICATI

TYPICAL

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

REFCOMP

AGND

D13(MSB)

D12

D11

D10

D9

D8

D7

D6

DGND

BUSY

CS

CONVST

RD

SHDN

D0

D1

D2

D3

D4

D5

LTC1419

10

µF

1

µF

DIFFERENTIAL

ANALOG INPUT

(–2.5V TO 2.5V)

10

µF

10

µF

–5V

5V

14-BIT

PARALLEL

BUS

µP CONTROL

LINES

1419 TA01

OUTPUT

2.50V

800kHz, 14-Bit Sampling A/D Converter

INPUT FREQUENCY (Hz)

10k

100k

1M 2M

1419 TA02

1k

14

13

12

11

10

9

8

7

6

5

4

3

2

86

80

74

68

62

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

vs Input Frequency