MAX1400 Maxim, MAX1400 Datasheet
MAX1400
Manufacturer Part Number
MAX1400
Description
%V / 18-Bit / Low-Power / Multichannel / Oversampling Sigma-Delta ADC
Manufacturer
Maxim
Datasheet
1.MAX1400.pdf
(36 pages)
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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.
SPI and QSPI are trademarks of Motorola, Inc.
19-1430; Rev 0; 2/99
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.
MAX1400CAI
MAX1400EAI
Portable Industrial Instruments
Portable Weigh Scales
Loop-Powered Systems
Pressure Transducers
PART
________________________________________________________________ Maxim Integrated Products
TEMP. RANGE
-40°C to +85°C
0°C to +70°C
Ordering Information
General Description
+5V, 18-Bit, Low-Power, Multichannel,
Applications
Oversampling (Sigma-Delta) ADC
28 SSOP
28 SSOP
PIN-PACKAGE
18-Bit Resolution, Sigma-Delta ADC
16-Bit Performance with No Missing Codes
to 480sps
Low Quiescent Current
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
TOP VIEW
250µA (operating mode)
2µA (power-down mode)
MUXOUT+
MUXOUT-
CLKOUT
ADCIN+
ADCIN-
CLKIN
RESET
AGND
AIN1
AIN2
AIN3
AIN4
CS
V+
10
11
12
13
14
1
2
3
4
5
6
7
8
9
MAX1400
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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