Rainbow-electronics MAX1402 Manuel d'utilisateur

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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
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1
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4
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SCLK
DIN
DOUT
INT
V
DD
DGND
AIN5
CALOFF+
CALOFF-
REFIN+
REFIN-
CALGAIN+
CALGAIN-
AIN6
AIN4
AIN3
AIN2
AIN1
V+
AGND
OUT1
OUT2
DS0
DS1
RESET
CS
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
28 SSOP
Pin Configuration
Ordering Information
EVALUATION KIT
AVAILABLE
SPI and QSPI are trademarks of Motorola, Inc.
19-1423; Rev 0; 3/99
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Résumé du contenu

Page 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

Page 2 - ELECTRICAL CHARACTERISTICS

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

Page 3 - DAC (Note 7)

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

Page 4

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

Page 5

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

Page 6 - Network

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

Page 7 - TIMING CHARACTERISTICS

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

Page 8

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

Page 9

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

Page 10 - MAX1402 toc11

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

Page 11

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

Page 12 - Pin Description (continued)

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

Page 13 - Circuit Description

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

Page 14 - Data Output

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

Page 15 - On-Chip Registers

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

Page 16

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

Page 17

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

Page 18 - Transfer-Function Register

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

Page 19 - Table 6. PGA Gain Codes

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

Page 20 - X = Don’t care

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

Page 21

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

Page 22 - Data Register (Read-Only)

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

Page 23 - Burn-Out Currents

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

Page 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

Page 25 - Reference Input

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

Page 26 - Output Noise

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

Page 27

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

Page 28 - = 2.4576MHz

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

Page 29 - Digital Filter

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

Page 30 - Filter Characteristics

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

Page 31 - Applications Information

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

Page 32

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

Page 33

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

Page 34 - Temperature Measurement

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

Page 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

Page 36 - Grounding and Layout

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

Page 37 - Optical Isolation

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

Page 38 - Chip Information

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

Page 39

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

Page 40

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

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