Maxim > Products > Analog-to-Digital Converters > MAX127, MAX127A, MAX127B, ...

MAX127, MAX127A, MAX127B, MAX128, MAX128A, MAX128B

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface

First 2-Wire 12-Bit, 8-Channel, Serial ADCs Have +/-17V Fault-Protected Inputs

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX127/MAX128 are multirange, 12-bit data acquisition systems (DAS) that require only a single +5V supply for operation, yet accept signals at their analog inputs that may span above the power-supply rail and below ground. These systems provide eight analog input channels that are independently software programmable for a variety of ranges: ±10V, ±5V, 0 to +10V, 0 to +5V for the MAX127; and ±V_REF, ±V_REF/2, 0 to +V_REF, 0 to +V_REF/2 for the MAX128. This range switching increases the effective dynamic range to 14 bits and provides the flexibility to interface 4-20mA, ±12V, and ±15V-powered sensors directly to a single +5V system. In addition, these converters are fault protected to ±16.5V; a fault condition on any channel will not affect the conversion result of the selected channel. Other features include a 5MHz bandwidth track/hold, an 8ksps throughput rate, and the option of an internal 4.096V or external reference.

The MAX127/MAX128 feature a 2-wire, I²C*-compatible serial interface that allows communication among multiple devices using SDA and SCL lines.

A hardware shutdown input (active-low SHDN) and two software-programmable power-down modes (standby and full power-down) are provided for low-current shutdown between conversions. In standby mode, the reference-buffer remains active, eliminating start-up delays.

The MAX127/MAX128 are available in 24-pin DIP or space-saving 28-pin SSOP packages.

Data Sheet

Download	Rev 0	(PDF, 136kB)
E-Mail

Key Features

12-Bit Resolution, 1/2 LSB Linearity
+5V Single-Supply Operation
I²C-Compatible, 2-Wire Serial Interface
Four Software-Selectable Input Ranges
- MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V
- MAX128: 0 to +V_REF, 0 to +V_REF/2, ±V_REF, ±V_REF/2
8 Analog Input Channels
8ksps Sampling Rate
±16.5V Overvoltage-Tolerant Input Multiplexer
Internal 4.096V or External Reference
Two Power-Down Modes
24-Pin Narrow DIP or 28-Pin SSOP Packages

Applications/Uses

Battery-Powered Applications
Data Acquisition
Industrial Control Systems
Robotics

Key Specifications:

Precision ADCs (< 5Msps)

Part Number

Resolution
(bits)

Input Chan.

Conv. Rate
(ksps)

Data Bus
(bits)

Diff/S.E. Input

Internal V_REF
(V)

External V_REF
(V)

Unipolar V_IN
(V)

Bipolar V_IN
(±V)

SNR
(dB)

SINAD
(dB)

THD
(dB)

SFDR
(dB)

DNL
(±LSB)

INL
(±LSB)

Package/Pins

Budgetary Price

ADC

max

nominal

min

max

See Notes

MAX127

I²C

S.E. Only

4.096

2.4

4.18

-87

PDIP(N)/24

SSOP/28

$12.62 @1k

MAX128

4.096

2.048

PDIP(N)/24

SSOP/28

$12.62 @1k

See All Precision ADCs (< 5Msps) (417)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Application Notes

Application Note 270		Analog-Signal Data Acquisition in Industrial Automation Systems
Reference Design 3297		Remote Monitoring System Sends Email via SMS

Product Guides

Signal Chain (PDF)

Reliability Reports

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Software/Models

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Ordering Information

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Part Number:

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Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX127ACAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX127ACAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127ACAI+T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127ACAI-T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX127ACNG			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24-8*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX127ACNG+			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24+8*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127AEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX127AEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127AEAI+T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX127AEAI-T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX127AEAI/GH9			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX127AEAI/GH9-T			Active	SSOP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX127AENG			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24-8*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX127AENG+			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24+8*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127BCAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX127BCAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127BCAI+T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127BCAI-T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX127BCNG			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24-8*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX127BCNG+			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24+8*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX127BEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX127BEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127BEAI+T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX127BEAI-T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX127BENG			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24-8*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX127BENG+			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24+8*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX128ACAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX128ACAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX128ACAI+T			Active	SSOP;28 pin Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX128ACAI-T			Active	SSOP;28 pin Land Pattern: Not Available	0°C to +70°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX128ACNG			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24-8*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX128ACNG+			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24+8*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX128AEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX128AEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX128AEAI+T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX128AEAI-T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX128AENG			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24-8*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX128AENG+			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24+8*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX128BCAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX128BCAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX128BCAI+T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX128BCAI-T			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX128BCNG			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24-8*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX128BCNG+			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24+8*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX128BEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX128BEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing:21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX128BEAI+T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX128BEAI-T			Active	SSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX128BENG			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24-8*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX128BENG+			Active	PDIP(N);24 pin;265.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N24+8*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

Notes and Comments

Multi-range, 12 bit, 2-wire interface

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-4773 Rev 0; 1998-07-01
This page last modified: 2007-07-20