Rainbow-electronics MAX1402 Instrukcja Użytkownika Pobierz pdf

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

General Description

The MAX1402 low-power, multichannel, serial-output

analog-to-digital converter (ADC) features matched

200µA current sources for sensor excitation. This ADC

uses a sigma-delta modulator with a digital decimation

filter to achieve 16-bit accuracy. The digital filter’s user-

selectable decimation factor allows the conversion res-

olution to be reduced in exchange for a higher output

data rate. True 16-bit performance is achieved at an

output data rate of up to 480sps. In addition, the modu-

lator sampling frequency may be optimized for either

lowest power dissipation or highest throughput rate.

The MAX1402 operates from a +5V supply.

This device offers three fully differential input channels

that may be independently programmed with a gain

between +1V/V and +128V/V. Furthermore, it can com-

pensate an input-referred DC offset up to 117% of the

selected full-scale range. These three differential chan-

nels may also be configured to operate as five pseudo-

differential input channels. Two additional, fully

differential system-calibration channels are provided for

gain and offset error correction.

The MAX1402 may be configured to sequentially scan all

signal inputs and provide the results via the serial inter-

face with minimum communications overhead. When

used with a 2.4576MHz or 1.024MHz master clock, the

digital decimation filter can be programmed to produce

zeros in its frequency response at the line frequency and

associated harmonics, ensuring excellent line rejection

without the need for further post-filtering.

The MAX1402 is available in a 28-pin SSOP package.

Applications

Portable Industrial Instruments

Portable Weigh Scales

Loop-Powered Systems

Pressure Transducers

Features

♦ 18-Bit Resolution, Sigma-Delta ADC

♦ 16-Bit Accuracy with No Missing Codes to 480sps

♦ Low Quiescent Current

250µA (operating mode)

2µA (power-down mode)

♦ Matched On-Board Current Sources (200µA) for

Sensor Excitation

♦ 3 Fully Differential or 5 Pseudo-Differential Signal

Input Channels

♦ 2 Additional, Fully Differential Calibration

Channels/Auxiliary Input Channels

♦ Programmable Gain and Offset

♦ Fully Differential Reference Inputs

♦ Converts Continuously or On Command

♦ Automatic Channel Scanning and Continuous

Data Output Mode

♦ Operates with +5V Analog Supply and +3V or +5V

Digital Supply

♦ 3-Wire Serial Interface—SPI™/QSPI™ Compatible

♦ 28-Pin SSOP Package

MAX1402

+5V, 18-Bit, Low-Power, Multichannel,

Oversampling (Sigma-Delta) ADC

________________________________________________________________

Maxim Integrated Products

SCLK

DIN

DOUT

INT

DGND

AIN5

CALOFF+

CALOFF-

REFIN+

REFIN-

CALGAIN+

CALGAIN-

AIN6

AIN4

AIN3

AIN2

AIN1

V+

AGND

OUT1

OUT2

DS0

DS1

RESET

CLKOUT

CLKIN

SSOP

TOP VIEW

MAX1402

PART

MAX1402CAI

MAX1402EAI -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 SSOP

Pin Configuration

Ordering Information

EVALUATION KIT

AVAILABLE

SPI and QSPI are trademarks of Motorola, Inc.

19-1423; Rev 0; 3/99

1 2 3 4 5 6 ... 39 40

Podsumowanie treści

Strona 1 - Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.General Descript

Strona 2 - ELECTRICAL CHARACTERISTICS

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC10 ________________________________________________________________________

Strona 3 - DAC (Note 7)

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 4

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC12 ________________________________________________________________________

Strona 5

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 6 - Network

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC14 ________________________________________________________________________

Strona 7 - TIMING CHARACTERISTICS

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 8

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC16 ________________________________________________________________________

Strona 9

CLKMAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC________________________________________________________________________

Strona 10 - MAX1402 toc11

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC18 ________________________________________________________________________

Strona 11

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 12 - Pin Description (continued)

%FSRMAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC2 _____________________________________________________________________

Strona 13 - Circuit Description

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC20 ________________________________________________________________________

Strona 14 - Data Output

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 15 - On-Chip Registers

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC22 ________________________________________________________________________

Strona 16

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 17

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC24 ________________________________________________________________________

Strona 18 - Transfer-Function Register

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 19 - Table 6. PGA Gain Codes

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC26 ________________________________________________________________________

Strona 20 - X = Don’t care

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 21

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC28 ________________________________________________________________________

Strona 22 - Data Register (Read-Only)

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 23 - Burn-Out Currents

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 24 - Channel Selection Network

when valid data is available, a minimum of three data-word periods later.The digital filter can be bypassed by setting the MDOUTbit in the global setu

Strona 25 - Reference Input

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 26 - Output Noise

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC32 ________________________________________________________________________

Strona 27

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 28 - = 2.4576MHz

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADCStrain Gauge OperationConnect the differential inputs of the MAX1402 to the

Strona 29 - Digital Filter

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC4–20mA Loop-Powered TransmittersLow power, single-supply operation, and eas

Strona 30 - Filter Characteristics

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC36 ________________________________________________________________________

Strona 31 - Applications Information

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 32

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC38 ________________________________________________________________________

Strona 33

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 34 - Temperature Measurement

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC4 _________________________________________________________________________

Strona 35 - RTD Configurations

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADCMaxim cannot assume responsibility for use of any circuitry other than circ

Strona 36 - Grounding and Layout

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 37 - Optical Isolation

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC6 _________________________________________________________________________

Strona 38 - Chip Information

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Strona 39

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC8 _________________________________________________________________________

Strona 40

MAX1402+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

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