Rainbow-electronics MAX1403 Manual de usuario descargar 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 MAX1403 18-bit, 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 con-

version resolution 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 modulator sampling frequency may be

optimized for either lowest power dissipation or highest

throughput rate. The MAX1403 operates from +3V.

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 MAX1403 can 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 postfiltering.

The MAX1403 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

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

Sensor Excitation

♦ Low Quiescent Current

250µA (operating mode)

2µA (power-down mode)

♦ 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 Analog and Digital Supplies

from +2.7V to +3.6V

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

♦ 28-Pin SSOP Package

MAX1403

+3V, 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

MAX1403

PART

MAX1403CAI

MAX1403EAI -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.

19-1481; Rev 0; 4/99

1 2 3 4 5 6 ... 35 36

Indice de contenidos

Pagina 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

Pagina 2 - ELECTRICAL CHARACTERISTICS

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC10 ________________________________________________________________________

Pagina 3 - DAC (Note 8)

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 4

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC12 ________________________________________________________________________

Pagina 5

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 6 - Network

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC14 ________________________________________________________________________

Pagina 7 - TIMING CHARACTERISTICS

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 8

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC16 ________________________________________________________________________

Pagina 9

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 10 - MAX1403 toc13

PGAMAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC18 _____________________________________________________________________

Pagina 11 - Pin Description

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 12 - Pin Description (continued)

FS1 = 0; MF1, MF0 = 1,MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC2 ___________________________________________________

Pagina 13 - Circuit Description

Do Not UseMAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC20 ______________________________________________________________

Pagina 14 - Data Output

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 15 - On-Chip Registers

DS1, DS0: The status of the auxiliary data input pins.These are latched on the first falling edge of the SCLKsignal for the current data register read

Pagina 16

Transducer Excitation CurrentsThe MAX1403 provides two matched 200µA transducerexcitation currents at OUT1 and OUT2. These currentshave low absolute t

Pagina 17

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC24 ________________________________________________________________________

Pagina 18 - Transfer-Function Register

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 19 - Table 6. PGA Gain Codes

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC26 ________________________________________________________________________

Pagina 20 - X = Don’t care

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 21 - Data Register (Read-Only)

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC28 ________________________________________________________________________

Pagina 22 - Burn-Out Currents

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 23 - Channel Selection Network

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 24 - Input Buffers

Analog FilteringThe digital filter does not provide any rejection close tothe harmonics of the modulator sample frequency.However, due to the high ove

Pagina 25 - 2.4576MHz

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 26

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC32 ________________________________________________________________________

Pagina 27 - = 2.4576MHz

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 28 - MINIMUM INPUT (U/B = 0)

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADCLoop-Powered, 4–20mA TransmittersLow-power, single-supply operation, and ea

Pagina 29 - Filter Characteristics

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 30 - Applications Information

MAX1403+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADCMaxim cannot assume responsibility for use of any circuitry other than circ

Pagina 31

+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC4 ________________________________________________________________________________

Pagina 32

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 33 - Temperature Measurement

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC6 _________________________________________________________________________

Pagina 34 - Figure 16. 4–20mA Transmitter

0 100MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC______________________________________________________________________

Pagina 35 - Grounding and Layout

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC8 _________________________________________________________________________

Pagina 36 - SSOP.EPS

MAX1403+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

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Rainbow-electronics MAX1403 Manual de usuario

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