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LTC1282

3V 140ksps 12-Bit

Sampling A/D Converter

with Reference

FEATURES

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DESCRIPTIO

Single Supply 3V or

鹵3V

Operation

140ksps Throughput Rate

12mW (Typ) Power Dissipation

On-Chip 25ppm/擄C Reference

Internal Synchronized Clock; No Clock Required

High Impedance Analog Input

69dB S/(N + D) and 77dB THD at Nyquist

鹵0.5LSB

INL and

鹵0.75LSB

DNL Max (A Grade)

2.7V Guaranteed Minimum Supply Voltage

ESD Protected On All Pins

24-Pin Narrow PDIP and SW Packages

0V to 2.5V or

鹵1.25V

Input Ranges

The LTC

廬

1282 is a 6碌s, 140ksps, sampling 12-bit A/D

converter that draws only 12mW from a single 3V or dual

鹵3V

supply. This easy-to-use device comes complete with

1.14碌s sample-and-hold, precision reference and inter-

nally trimmed clock. Unipolar and bipolar conversion

modes provide flexibility for various applications. They are

built with LTBiCMOS

TM

switched capacitor technology.

The LTC1282 has a 25ppm/擄C (max) internal reference

and converts 0V to 2.5V unipolar inputs from a single 3V

supply. With

鹵3V

supplies its input range is

鹵1.25V

with

two鈥檚 complement output format. Maximum DC specifica-

tions include

鹵0.5LSB

INL,

鹵0.75LSB

DNL and 25ppm/擄C

full-scale drift over temperature. Outstanding AC perfor-

mance includes 69dB S/(N + D) and 77dB THD at the

Nyquist input frequency of 70kHz.

The internal clock is trimmed for 6碌s maximum conver-

sion time. The clock automatically synchronizes to each

sample command eliminating problems with asynchro-

nous clock noise found in competitive devices. A high

speed parallel interface eases connections to FIFOs, DSPs

and microprocessors.

APPLICATI

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3V Powered Systems

High Speed Data Acquisition

Digital Signal Processing

Multiplexed Data Acquisition Systems

Audio and Telecom Processing

Spectrum Analysis

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

LTBiCMOS is a trademark of Linear Technology Corporation

TYPICAL APPLICATI

Single 3V Supply, 140ksps, 12-Bit Sampling A/D Converter

LTC1282

1.20V

V

REF

OUTPUT

ANALOG INPUT 1 A

V

DD

(0V TO 2.5V) 2

IN

V

REF

V

SS

3

AGND

BUSY

0.1碌F

4

D11(MSB) CS

5

D10

RD

6

D9

HBEN

7

D8

NC

8

D7

NC

9

D6

D0/8

10

8- OR 12-BIT

D5

D1/9

PARALLEL BUS

11

D4

D2/10

12

DGND

D3/11

24

23

22

21

20

19

18

17

16

15

14

13

10碌F

碌P

CONTROL

LINES

0.1碌F

3V

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

vs Input Frequency

12

74

68

62

NYQUIST

FREQUENCY

56

50

ENOBs (EFFECTIVE NUMBER OF BITS)

+

11

10

9

8

7

6

5

4

3

2

1

0

1k

10k

INPUT FREQUENCY (Hz)

100k

LTC1282 鈥?TA02

+

10碌F

f

SAMPLE

= 140kHz

1282 TA01

U

S/(N + D) (dB)

UO

UO

1

next

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