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MAX1402_07

Description
5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC
File Size553KB,38 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

MAX1402_07 Overview

5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC

19-1423; Rev 2; 1/07
IT
TION K
VALUA
E
BLE
AVAILA
+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
General Description
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
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.
Pin Configuration
TOP VIEW
CLKIN 1
28 SCLK
27 DIN
26 DOUT
25 INT
24 V
DD
Applications
Portable Industrial Instruments
Portable Weigh Scales
Loop-Powered Systems
Pressure Transducers
CLKOUT 2
CS 3
RESET 4
MUXOUT+ 5
MUXOUT- 6
OUT2 7
OUT1 8
MAX1402
23 DGND
22 CALOFF+
21 CALOFF-
20 REFIN+
19 REFIN-
18 CALGAIN+
17 CALGAIN-
16 AIN6
15 AIN5
Ordering Information
PART
MAX1402CAI
MAX1402EAI
TEMP RANGE
0°C to +70°C
-40°C to +85°C
PIN-
PACKAGE
28 SSOP
28 SSOP
PKG
CODE
A28-2
A28-2
AGND 9
V+ 10
AIN1 11
AIN2 12
AIN3 13
AIN4 14
SPI and QSPI are trademarks of Motorola, Inc.
SSOP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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