Rainbow-electronics MAX1400 User Manual Page 1

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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.
MAX1400
+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
________________________________________________________________
Maxim Integrated Products
1
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
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
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
28 SSOP
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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.MAX1400+5V, 18-B

Page 2 - ELECTRICAL CHARACTERISTICS

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

Page 3 - OFFSET DAC

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

Page 4

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

Page 5

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

Page 6 - Network

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

Page 7 - TIMING CHARACTERISTICS

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

Page 8

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

Page 9 - Pin Description

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

Page 10 - Pin Description (continued)

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

Page 11 - Circuit Description

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

Page 12 - Serial Digital Interface

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

Page 13 - On-Chip Registers

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

Page 14

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

Page 15

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

Page 16 - (SCAN = 0)

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

Page 17 - Table 6. PGA Gain Codes

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

Page 18 - X = Don’t care

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

Page 19 - Data Register (Read-Only)

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

Page 20

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

Page 21 - Channel Selection Network

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

Page 22 - Input Buffers

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

Page 23 - Output Noise

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

Page 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

Page 25 - = 2.4576MHz

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

Page 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

Page 27 - Filter Characteristics

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

Page 28 - Applications Information

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

Page 29

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

Page 30

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

Page 31 - Temperature Measurement

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

Page 32 - Power Supplies

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

Page 33 - Chip Information

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

Page 34 - SSOP.EPS

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

Page 35

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

Page 36

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

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