Rainbow-electronics MAX1400 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.

MAX1400

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

Oversampling (Sigma-Delta) ADC

________________________________________________________________

Maxim Integrated Products

19-1430; Rev 0; 2/99

General Description

The MAX1400 18-bit, low-power, multichannel, serial-

output ADC uses a sigma-delta modulator with a digital

decimation filter to achieve true 16-bit accuracy. The

user-selectable decimation factor of the digital filter

allows the conversion resolution to be reduced in

exchange for a higher output data rate. The device

achieves true 16-bit performance 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 MAX1400

operates from +5V.

This device offers three fully differential input channels

that can be independently programmed with a gain

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

pensate an input-referred DC offset (such as system off-

set) up to 117% of the selected full-scale range. These

three differential channels 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. External

access is provided to the multiplexer (mux) output to

facilitate additional signal processing.

The MAX1400 can be configured to scan all signal inputs

sequentially and provide the results through the serial

interface 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 fre-

quency and associated harmonics, ensuring excellent

line rejection without the need for further post-filtering.

The MAX1400 comes 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 Performance with No Missing Codes

to 480sps

♦ 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

♦ Access to the Mux Output/ADC Input

♦ 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

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

♦ 28-Pin SSOP Package

SCLK

DIN

DOUT

INT

DGND

AIN5

CALOFF+

CALOFF-

REFIN+

REFIN-

CALGAIN+

CALGAIN-

AIN6

AIN4

AIN3

AIN2

AIN1

V+

AGND

ADCIN-

ADCIN+

MUXOUT-

MUXOUT+

RESET

CLKOUT

CLKIN

SSOP

TOP VIEW

MAX1400

SPI and QSPI are trademarks of Motorola, Inc.

Pin Configuration

Ordering Information

PART

MAX1400CAI

MAX1400EAI -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 SSOP

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.MAX1400+5V, 18-B

Pagina 2 - ELECTRICAL CHARACTERISTICS

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC10 ________________________________________________________________________

Pagina 3 - OFFSET DAC

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 4

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC12 ________________________________________________________________________

Pagina 5

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 6 - Network

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC14 ________________________________________________________________________

Pagina 7 - TIMING CHARACTERISTICS

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 8

First Bit (MSB) (LSB)MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC16 ___________________________________________________

Pagina 9 - Pin Description

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 10 - Pin Description (continued)

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC18 ________________________________________________________________________

Pagina 11 - Circuit Description

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 12 - Serial Digital Interface

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC2 _________________________________________________________________________

Pagina 13 - On-Chip Registers

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC20 ________________________________________________________________________

Pagina 14

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 15

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC22 ________________________________________________________________________

Pagina 16 - (SCAN = 0)

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 17 - Table 6. PGA Gain Codes

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC24 ________________________________________________________________________

Pagina 18 - X = Don’t care

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 19 - Data Register (Read-Only)

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC26 ________________________________________________________________________

Pagina 20

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 21 - Channel Selection Network

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC28 ________________________________________________________________________

Pagina 22 - Input Buffers

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 23 - Output Noise

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 24

Bit Banging Interface (80C51, PIC16C54)Any microcontroller can use general-purpose I/O pinsto interface to the MAX1400. If a bidirectional or open-dra

Pagina 25 - = 2.4576MHz

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 26 - Clock Oscillator

4–20mA Loop-Powered TransmittersLow power, single-supply operation, and easy interfac-ing with optocouplers make the MAX1400 ideal forloop-powered 4–2

Pagina 27 - Filter Characteristics

Grounding and LayoutFor best performance, use printed circuit boards withseparate analog and digital ground planes. Wire-wrapboards are not recommende

Pagina 28 - Applications Information

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC34 ________________________________________________________________________

Pagina 29

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 30

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADCMaxim cannot assume responsibility for use of any circuitry other than circ

Pagina 31 - Temperature Measurement

Power-Supply Rejection V+ (Note 16) dBPSRMAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC4 ________________________________

Pagina 32 - Power Supplies

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 33 - Chip Information

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC6 _________________________________________________________________________

Pagina 34 - SSOP.EPS

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Pagina 35

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC8 _________________________________________________________________________

Pagina 36

MAX1400+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

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