LTC1272-3 Linear Technology Corporation, LTC1272-3 Datasheet

LTC1272-3

Manufacturer Part Number

LTC1272-3

Description

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC1272-3.pdf (20 pages)

Specifications of LTC1272-3

Case

DIP24

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Download datasheet (265Kb)

FEATURE

TYPICAL

OUTPUT

PPLICATI

AD7572 Pinout

12-Bit Resolution

3 s and 8 s Conversion Times

On-Chip Sample-and-Hold

Up to 250kHz Sample Rates

5V Single Supply Operation

No Negative Supply Required

On-Chip 25ppm/ C Reference

75mW (Typ) Power Consumption

24-Pin Narrow DIP and SOL Packages

ESD Protected on All Pins

2.42V

High Speed Data Acquisition

Digital Signal Processing (DSP)

Multiplexed Data Acquisition Systems

Single Supply Systems

REF

8 OR 12-BIT

ANALOG INPUT

Single 5V Supply, 3 s, 12-Bit Sampling ADC

PARALLEL

0.1 F

(0V TO 5V)

BUS

PPLICATI

10 F

D11 (MSB)

D10

AGND

DGND

REF

LTC1272

CLK OUT

CLK IN

D2/10

BUSY

HBEN

D3/11

D0/8

D1/9

10 F

CONTROL

LINES

LTC1272 • TA01

0.1 F

The LTC1272 is a 3 s, 12-bit, successive approximation

sampling A/D converter. It has the same pinout as the

industry standard AD7572 and offers faster conversion

time, on-chip sample-and-hold, and single supply opera-

tion. It uses LTBiCMOS

combine a high speed 12-bit ADC with a fast, accurate

sample-and-hold and a precision reference.

The LTC1272 operates with a single 5V supply but can also

accept the 5V/–15V supplies required by the AD7572 (Pin

23, the negative supply pin of the AD7572, is not connected

on the LTC1272). The LTC1272 has the same 0V to 5V input

range as the AD7572 but, to achieve single supply opera-

tion, it provides a 2.42V reference output instead of the

– 5.25V of the AD7572. It plugs in for the AD7572 if the

reference capacitor polarity is reversed and a 1 s sample-

and-hold acquisition time is allowed between conversions.

The output data can be read as a 12-bit word or as two

8-bit bytes. This allows easy interface to both 8-bit and

higher processors. The LTC1272 can be used with a

crystal or an external clock and comes in speed grades of

3 s and 8 s.

LTBiCMOS is a trademark of Linear Technology Corporation

ESCRIPTIO

Sampling A/D Converter

–100

–120

–140

–20

–40

–60

–80

1024 Point FFT, f

12-Bit, 3 s, 250kHz

switched-capacitor technology to

FREQUENCY (kHz)

= 250kHz, f

LTC1272

(N+D)

= 10kHz

100

= 72.1

LTC1272 • TA02

120

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