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

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 compensate an input-referred DC offset (such as system offset) 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 rejection without the need for further postfiltering.

The MAX1401 is available in a 28-pin SSOP package.

Key Features

Applications/Uses

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

	Loop-Powered Systems
	Portable Industrial Instruments
	Portable Weight Scales
	Pressure Sensors and Transducers

Key Specifications: Precision ADCs (< 5Msps)

Part Number

Resolution
(bits)

Input Chan.

Conv. Rate
(ksps)

Conv. Time
(µs)

Data Bus
(bits)

Ref.
(V)

Diff. Inputs

V_SUPPLY
(V)

I_CC
(mA)

Power
(mW)

Standby Mode

Package/Pins

Price

ADC

max

typ

See Notes

MAX1401

4.8

205

Serial

Ext.

Yes

0.25

0.75

Yes

SSOP/28

$8.95 @1k

See All Precision ADCs (< 5Msps) (377)

Diagram

Functional Diagram

Application Notes

Application Note 722: 3V/5V DACs Support Intelligent Current Loop - MAX1401
Application Note 726: Specifying Quartz Crystals - MAX1401
Application Note 3418: Understanding the Effects of Clock Tolerances on 50/60Hz Noise Rejection in High Performance Sigma Delta ADCs - MAX1401

Reliability Reports

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Software/Models

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Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-8 of 8

MAX1401 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX1401CAI

Active SSOP;28 pin;82 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-2*
0°C to +70°C RoHS/Lead-Free: No
Materials Analysis

MAX1401CAI-T

Active

Land Pattern: Not Available

0°C to +70°C See data sheet

MAX1401CAI+

Active SSOP;28 pin;82 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+2*
0°C to +70°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1401CAI+T

Active

Land Pattern: Not Available

0°C to +70°C See data sheet

MAX1401EAI

Active SSOP;28 pin;82 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis

MAX1401EAI-T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX1401EAI+

Active SSOP;28 pin;82 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1401EAI+T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

Notes and Comments

6-channels, input buffer, PGA, digital filter, serial interface, converts up to 480sps

Related Products

MAX1400 +5V 18-Bit Low-Power Multichannel Oversampling (Sigma-Delta) ADC
MAX1403 +3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC

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See All Precision ADCs (< 5Msps) (377 Products)

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Document Ref.: 19-1480; Rev 1; 2002-11-20
This page last modified: 2009-11-05