Rainbow-electronics MAX1401 User Manual

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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.
MAX1401
+3V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
________________________________________________________________
Maxim Integrated Products
1
19-1480; Rev 0; 5/99
EVALUATION KIT
AVAILABLE
General Description
The MAX1401 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 MAX1401
operates from +3V.
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 MAX1401 can be configured to sequentially scan all
signal inputs 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 frequency
and associated harmonics, ensuring excellent line rejec-
tion without the need for further postfiltering.
The MAX1401 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
Access to the Mux Output/ADC Input
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
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SCLK
DIN
DOUT
INT
V
DD
DGND
AIN5
CALOFF+
CALOFF-
REFIN+
REFIN-
CALGAIN+
CALGAIN-
AIN6
AIN4
AIN3
AIN2
AIN1
V+
AGND
ADCIN-
ADCIN+
MUXOUT-
MUXOUT+
RESET
CS
CLKOUT
CLKIN
SSOP
TOP VIEW
MAX1401
SPI and QSPI are trademarks of Motorola, Inc.
Pin Configuration
Ordering Information
28 SSOP
28 SSOP
PIN-PACKAGETEMP. RANGE
0°C to +70°C
-40°C to +85°CMAX1401EAI
MAX1401CAI
PART
Page view 0
1 2 3 4 5 6 ... 35 36

Summary of Contents

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.MAX1401+3V, 18-B

Page 2 - ELECTRICAL CHARACTERISTICS

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC10 ________________________________________________________________________

Page 3 - DAC (Note 9)

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 4

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC12 ________________________________________________________________________

Page 5

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 6 - Network

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC14 ________________________________________________________________________

Page 7 - TIMING CHARACTERISTICS

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 8

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC16 ________________________________________________________________________

Page 9

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 10 - MAX1401-12

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC18 ________________________________________________________________________

Page 11

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 12 - Pin Description (continued)

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC2 _________________________________________________________________________

Page 13 - Circuit Description

Do Not UseDo Not UseMAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC20 ____________________________________________________

Page 14 - Serial Digital Interface

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 15 - On-Chip Registers

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC22 ________________________________________________________________________

Page 16

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 17

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC24 ________________________________________________________________________

Page 18 - (SCAN = 0)

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 19 - Table 6. PGA Gain Codes

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC26 ________________________________________________________________________

Page 20 - X = Don’t care

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 21 - Data Register (Read-Only)

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC28 ________________________________________________________________________

Page 22 - Burn-Out Currents

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 23 - Channel Selection Network

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 24 - Input Buffers

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC30 ________________________________________________________________________

Page 25 - Output Noise

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 26

Bit-Banging Interface (80C51, PIC16C54)Any microcontroller can use general-purpose I/O pinsto interface to the MAX1401. If a bidirectional or open-dra

Page 27 - = 2.4576MHz

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 28 - Clock Oscillator

Loop-Powered, 4–20mA TransmittersLow power, single-supply operation, and easy interfac-ing with optocouplers make the MAX1401 ideal forloop-powered 4–

Page 29 - Filter Characteristics

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

Page 30 - Applications Information

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADCMaxim cannot assume responsibility for use of any circuitry other than circ

Page 31

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC4 _________________________________________________________________________

Page 32

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC___________________________________________________________________________

Page 33 - Temperature Measurement

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC6 _________________________________________________________________________

Page 34 - Power Supplies

nsMAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC_________________________________________________________________________

Page 35 - Chip Information

MAX1401+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC8 _________________________________________________________________________

Page 36 - SSOP.EPS

-150-5-1051015-1.0 -0.5 0 0.5 1.0MAX1401-02DIFFERENTIAL INPUT VOLTAGE (V)DNL (ppm)480spsGAIN = +1V/V262, 144 ptsDIFFERENTIAL NONLINEARITYMAX1401+3V, 1

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