ADC12L030CIWM National Semiconductor, ADC12L030CIWM Datasheet

ADC12L030CIWM

Manufacturer Part Number

ADC12L030CIWM

Description

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

Manufacturer

National Semiconductor

Datasheet

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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

The analog inputs can be configured to operate in various

combinations

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

references, see the LM4040 or LM4041 data sheets.

ADC12L038 Simplified Block Diagram

TRI-STATE

COPS

Microsoft

⁄

LSB each.

™

microcontrollers, HPC

™

is a trademark of Microsoft Corporation.

is a registered trademark of National Semiconductor Corporation.

™

and Motorola’s SPI standards. For voltage

™

and MICROWIRE

single-ended,

™

are trademarks of National Semiconductor Corporation.

DS011830

differential,

Features

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

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

n 12-bit plus sign conversion time

n 12-bit plus sign sampling rate

n Integral linearity error

n Single supply

n Power dissipation

n Power down

Applications

n Portable Medical instruments

n Portable computing

n Portable Test equipment

supply

DS011830-1

12-bit plus sign

15 mW (max)

73 kHz (max)

www.national.com

1 LSB (max)

8.8 µs (min)

40 µW (typ)

3.3V

June 1999

10%

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