MAX11040 Maxim Integrated Products, MAX11040 Datasheet

MAX11040

Manufacturer Part Number

MAX11040

Description

Sigma-Delta ADC

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX11040.pdf (31 pages)

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The MAX11040 is a 24-bit, 4-channel, simultaneous-

sampling, sigma-delta analog-to-digital converter

(ADC). The device allows simultaneous sampling of as

many as 32 channels using a built-in cascade feature

to synchronize as many as eight devices. The serial

interface of the MAX11040 allows reading data from all

the cascaded devices using a single command. Four

modulators simultaneously convert each fully differen-

tial analog input with a programmable data output rate

ranging from 0.25ksps to 64ksps. The device achieves

106dB SNR at 16ksps and 117dB SNR at 1ksps. The

MAX11040 operates from a single +3V supply. The dif-

ferential analog input range is ±2.2V when using the

internal reference, an external reference is optional.

Each input is overvoltage protected up to ±6V without

damage. The device uses an internal crystal oscillator

or an external source for clock.

The MAX11040 is compatible with SPI™, QSPI™,

MICROWIRE™, and DSP-compatible 4-wire serial inter-

faces. An on-board interface logic allows one serial inter-

face (with a single chip select) to control up to eight

cascaded devices or 32 simultaneous sampling analog

input channels.

The MAX11040 is ideally suited for power-management

systems. Each channel includes an adjustable sam-

pling phase enabling internal compensation for phase

shift due to external dividers, transformers, or filters at

the inputs. The output data rate is adjustable with a

0.065% resolution (at 16ksps or below) to track the

varying frequency of a periodic input. A SYNC input

allows periodic alignment of the conversion timing of

multiple devices with a remote timing source.

The MAX11040 is available in a 38-pin TSSOP package

specified over the -40°C to +105°C industrial tempera-

ture range.

19-4302; Rev 0; 5/09

+ Denotes a lead(Pb)-free/RoHS-compliant package.

MICROWIRE is a trademark of National Semiconductor Corp.

SPI/QSPI are trademarks of Motorola Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

MAX11040GUU+

PART

Power Protection Relay Equipment

Multiphase Power Systems

Industrial Data-Acquisition Systems

Medical Instrumentation

________________________________________________________________ Maxim Integrated Products

-40°C to +105°C

TEMP RANGE

Ordering Information

General Description

24-Bit, 4-Channel, Simultaneous-Sampling,

Applications

PIN-PACKAGE

38 TSSOP

Cascadable, Sigma-Delta ADC

♦ Four Fully Differential Simultaneously Sampled

♦ Cascadable for Up to 32 Channels of

♦ 106dB SNR at 16ksps

♦ 117dB SNR at 1ksps

♦ 0.25% Error Over a 1000:1 Dynamic Range,

♦ ±2.2V Full-Scale Input Range

♦ ±6V Overvoltage Protected Inputs

♦ Internal Crystal Oscillator

♦ 2.5V, 50ppm/°C Internal Reference or External

♦ Programmable Output Data Rate

♦ Programmable Sampling Phase

♦ SPI-/QSPI-/MICROWIRE-/DSP-Compatible 4-Wire

♦ Cascadable Interface Allows Control of Up to

♦ 3.0V to 3.6V Analog Supply Voltage

♦ 2.7V to V

♦ 38-Pin TSSOP Package

Pin Configuration appears at end of data sheet.

AIN0+

AIN0-

AIN1+

AIN1-

AIN2+

AIN2-

AIN3+

AIN3-

REFIO

REF0

REF1

REF2

REF3

Channels

Simultaneous Sampling

Processed Over 16.7ms

Reference

Serial Interface

Eight Devices with a Single CS Signal

0.25ksps to 64ksps Range

0.065% Resolution

0 to 333µs Delay in 1.33µs Steps

AGND

AVDD

Digital Supply Voltage

24-BIT

ADC

REFERENCE

2.5V

Functional Diagram

DIGITAL

FILTER

OSCILLATOR

XIN

CRYSTAL

REGISTERS AND

XOUT

CONTROL

DIGITAL

CLKOUT

MAX11040

OVRFLW

INTERFACE

Features

SERIAL

DGND

FAULT

SYNC

DRDYIN

DRDYOUT

CASCIN

CASCOUT

SCLK

DIN

DOUT

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