ADC12L034CIWM datasheet(1/36 Pages) NSC

No. de pieza	ADC12L034CIWM

Descripción Electrónicos	3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold

PDF	36 Pages

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Fabricante Electrónico	NSC [National Semiconductor (TI)]

Página de inicio	http://www.national.com

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ADC12L030/ADC12L032/ADC12L034/ADC12L038

3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D

Converters with MUX and Sample/Hold

General Description

The ADC12L030 family is 12-bit plus sign successive ap-

proximation A/D converters with serial I/O and configurable

input multiplexers. These devices are fully tested with a

single 3.3V power supply. The ADC12L032, ADC12L034 and

ADC12L038 have 2, 4 and 8 channel multiplexers, respec-

tively. Differential multiplexer outputs and A/D inputs are

available on the MUXOUT1, MUXOUT2, A/DIN1 and A/DIN2

pins. The ADC12L030 has a two channel multiplexer with the

multiplexer outputs and A/D inputs internally connected. On

request, these A/Ds go through a self calibration process

that adjusts linearity, zero and full-scale errors to less than

±1⁄2 LSB each.

The analog inputs can be configured to operate in various

combinations

of

single-ended,

differential,

or

pseudo-differential modes. A fully differential unipolar analog

input range (0V to +3.3V) can be accommodated with a

single +3.3V supply. In the differential modes, valid outputs

are obtained even when the negative inputs are greater than

the positive because of the 12-bit plus sign two’s compliment

output data format.

The serial I/O is configured to comply with NSC’s

MICROWIRE™ and Motorola’s SPI standards. For voltage

references, see the LM4040 or LM4041 data sheets.

Features

n 0V to 3.3V analog input range with single 3.3V power

supply

n Serial I/O ( MICROWIRE and SPI Compatible)

n 2, 4, or 8 channel differential or single-ended multiplexer

n Analog input sample/hold function

n Power down mode

n Variable resolution and conversion rate

n Programmable acquisition time

n Variable digital output word length and format

n No zero or full scale adjustment required

n Fully tested and guaranteed with a 2.5V reference

n No Missing Codes over temperature

Key Specifications

n Resolution

12-bit plus sign

n 12-bit plus sign conversion time

8.8 µs (min)

n 12-bit plus sign sampling rate

73 kHz (max)

n Integral linearity error

±1 LSB (max)

n Single supply

3.3V ±10%

n Power dissipation

15 mW (max)

n Power down

40 µW (typ)

Applications

n Portable Medical instruments

n Portable computing

n Portable Test equipment

ADC12L038 Simplified Block Diagram

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

COPS™ microcontrollers, HPC™ and MICROWIRE™ are trademarks of National Semiconductor Corporation.

Microsoft™ is a trademark of Microsoft Corporation.

DS011830-1

June 1999

DS011830

www.national.com

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ADC12L034CIWM Datasheet(PDF) 1 Page - National Semiconductor (TI)

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