MAX1403 Maxim, MAX1403 Datasheet

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MAX1403

Manufacturer Part Number
MAX1403
Description
+3V / 18-Bit / Low-Power / Multichannel / Oversampling Sigma-Delta ADC
Manufacturer
Maxim
Datasheet

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The MAX1403 18-bit, 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 con-
version resolution 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 modulator sampling frequency may be
optimized for either lowest power dissipation or highest
throughput rate. The MAX1403 operates from +3V.
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 MAX1403 can 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 postfiltering.
The MAX1403 is available in a 28-pin SSOP package.
19-1481; Rev 0; 4/99
SPI and QSPI are trademarks of Motorola, Inc.
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.
MAX1403CAI
MAX1403EAI
PART
Portable Industrial Instruments
Portable Weigh Scales
Loop-Powered Systems
Pressure Transducers
________________________________________________________________ Maxim Integrated Products
TEMP. RANGE
-40°C to +85°C
0°C to +70°C
Ordering Information
General Description
+3V, 18-Bit, Low-Power, Multichannel,
Applications
Oversampling (Sigma-Delta) ADC
28 SSOP
28 SSOP
PIN-PACKAGE
18-Bit Resolution, Sigma-Delta ADC
16-Bit Accuracy with No Missing Codes to 480sps
Matched On-Board Current Sources (200µA) for
Sensor Excitation
Low Quiescent Current
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
250µA (operating mode)
2µA (power-down mode)
TOP VIEW
CLKOUT
RESET
CLKIN
AGND
OUT2
OUT1
AIN1
AIN2
AIN3
AIN4
DS1
DS0
CS
V+
10
11
12
13
14
1
2
3
4
5
6
7
8
9
MAX1403
SSOP
Pin Configuration
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SCLK
DIN
DOUT
INT
V
DGND
CALOFF+
CALOFF-
REFIN+
REFIN-
CALGAIN+
CALGAIN-
AIN6
AIN5
DD
Features
1

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