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LTC1410

12-Bit, 1.25Msps Sampling

A/D Converter with Shutdown

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FEATURE

DESCRIPTIO

The LTC

µs, 1.25Msps, 12-bit sampling

A/D converter that draws only 160mW from

±5V supplies.

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

sample-and-hold, a precision reference and requires no

external components. Two digitally selectable power shut-

down modes provide flexibility for low power systems.

The LTC1410’s full-scale input range is

±2.5V. Maximum

DC specifications include

±1LSB INL and ±1LSB DNL over

temperature. Outstanding AC performance includes 71dB

S/(N + D) and 82dB THD at the Nyquist input frequency of

625kHz.

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, 12-bit parallel output port.

There is no pipeline delay in the conversion results. A

separate convert start input and a data ready signal (BUSY)

ease connections to FIFOs, DSPs and microprocessors.

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1.25Msps Sample Rate

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Power Dissipation: 160mW

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71dB S/(N + D) and 82dB THD at Nyquist

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No Pipeline Delay

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Nap (7mW) and Sleep (10

µW) Shutdown Modes

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Operates with 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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±2.5V Bipolar Input Range

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28-Pin SO Wide Package

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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

Complete 1.25MHz, 12-Bit Sampling A/D Converter

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

vs Input Frequency

INPUT FREQUENCY (Hz)

2

4

6

8

10

10k

100k

1M

10M

LTC1410 • TA02

0

1k

12

74

68

62

56

50

NYQUIST

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

LTC1410

0.1

µF

+

10

µF

DIFFERENTIAL

ANALOG INPUT

(–2.5V TO 2.5V)

2.50V

10

µF

10

µF

0.1

µF

0.1

µF

–5V

5V

12-BIT

PARALLEL

BUS

µP CONTROL

LINES

1410 TA01

+

REFCOMP

AGND

D11(MSB)

D10

D9

D8

D7

D6

D5

D4

DGND

BUSY

CS

CONVST

RD

SHDN

NAP/SLP

OGND

D0

D1

D2

D3