Maxim > Products > Analog-to-Digital Converters > MAX135

MAX135

±15-Bit, Low-Power ADC with Parallel Interface

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX135 is a CMOS 15-bit, binary-output analog-to-digital converter (ADC). Multi-slope integration provides low-noise and high-resolution conversions in less time than standard integrating ADCs: The MAX135 is tested at 16 conversions per second, but operates at up to 6 times that rate. The MAX135 uses Super LSBs with data averaging to achieve 18-bit resolution.

Supply current is 125µA maximum during normal operation and only 10µA maximum in sleep mode. Low conversion noise allows tested operation at only 300mV full scale (15µV per LSB). A simple 8-bit parallel data bus and three control lines easily interface to all common microprocessors, and twos-complement output coding simplifies bipolar measurements.

High resolution and compact size make the MAX135 ideal for data loggers, numerical control systems, weight scales, data-acquisition systems, and panel meters. The MAX135 comes in 28-pin DIP and SO packages in both commercial and extended temperature grades.

Data Sheet

Download	Rev 0	(PDF, 4.2MB)
E-Mail

Key Features

15-bit, Multi-slope Integration ADC
15µV Resolution at 16 Conv/Sec
Low Supply Current
- 125µA Max (Normal Operation)
- 10µA Max (Sleep-Mode Operation)
±0.005% Accuracy at 16 Conv/Sec
3 Super Bits for 18-Bit Resolution
Low Noise—Operates at 300mV Full Scale
Easy µP Interface—8-Bit Parallel Data Bus
±10pA Input Leakage Current
Small 28 pin DIP and SO packages

Applications/Uses

Analog-Signal Measurement: Pressure, Flow, Temperature, Voltage, Current, Resistance, Weight
Battery-Powered Instruments
Control Applications
Data Acquisition

Key Specifications:

Precision ADCs (< 5Msps)

Part Number

Resolution
(bits)

Input Chan.

Conv. Rate
(ksps)

Data Bus
(bits)

Diff/S.E. Input

External V_REF
(V)

Bipolar V_IN
(±V)

Package/Pins

Budgetary Price

ADC

max

See Notes

MAX135

0.0016

µP/8

Diff. Only

0.545

0.3

PDIP(W)/28

SOIC(W)/28

$9.94 @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

Product Guides

Signal Chain (PDF)

Thermal Management (PDF)

Reliability Reports

Reliability Report:	MAX135.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX135C/D			Active	DICE; Land Pattern: Not Available		See data sheet
MAX135CPI			Active	PDIP(W);28 pin;592.6 mm² Outline Drawing:21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX135CPI+			Active	PDIP(W);28 pin;592.6 mm² Outline Drawing:21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX135CWI			Active	SOIC(W);28 pin;192.8 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0109 (PDF) Use pkgcode/variation: W28-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX135CWI+			Active	SOIC(W);28 pin;192.8 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0109 (PDF) Use pkgcode/variation: W28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX135CWI+T			Active	SOIC(W);28 pin;192.8 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0109 (PDF) Use pkgcode/variation: W28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX135CWI-T			Active	W.SO;28 pin Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX135EPI			Active	PDIP(W);28 pin;592.6 mm² Outline Drawing:21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX135EPI+			Active	PDIP(W);28 pin;592.6 mm² Outline Drawing:21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX135EWI			Active	SOIC(W);28 pin;192.8 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0109 (PDF) Use pkgcode/variation: W28-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX135EWI+			Active	SOIC(W);28 pin;192.8 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0109 (PDF) Use pkgcode/variation: W28+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX135EWI+T			Active	W.SO;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX135EWI-T			Active	W.SO;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

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.

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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.: 19-4131 Rev 0; 1991-09-01
This page last modified: 2008-04-30