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Data Sheet

FULL DATA SHEET (PDF, 496kB) Download   E-Mail

Description

The MAX1491/MAX1493/MAX1495 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated liquid crystal display (LCD) drivers operate from a single 2.7V to 5.25V power supply. They include an internal reference, a high-accuracy on-chip oscillator, and a triplexed LCD driver. An internal charge pump generates the negative supply needed to power the integrated input buffer for single supply operation. The ADC is configurable for either a ±2V or ±200mV input range and it outputs its conversion results to an LCD. The MAX1491 is a 3.5-digit (±1999 count) device, and the MAX1493/MAX1495 are 4.5-digit (±19,999 count) devices. The MAX1491/MAX1493/MAX1495 do not require external-precision integrating or auto-zero capacitors, crystal oscillators, charge pumps, or other circuitry required with dual slope ADCs (commonly used in panel meter circuits). These devices also feature on-chip buffers for the differential signal and reference inputs, allowing direct interface with high-impedance signal sources. In addition, the MAX1491/MAX1493/MAX1495 use continuous internal offset calibration, and offer >100dB rejection of 50Hz and 60Hz line noise. The MAX1493/MAX1495 perform enhanced offset calibration at power-up. The MAX1495 also performs enhanced calibration on demand. Other features include data hold and peak hold, and a user programmable low-battery monitor. The MAX1493/MAX1495 come in a 32-pin 7mm x 7mm TQFP package, and the MAX1491 comes in 28-pin SSOP and 28-pin DIP packages. All devices in this family operate over the 0°C to +70°C commercial temperature range.

Key Features		Applications/Uses
High Resolution MAX1495: 4.5 Digits (±19,999 Count) MAX1493: 4.5 Digits (±19,999 Count) MAX1491: 3.5 Digits (±1999 Count) Sigma-Delta ADC Architecture No Integrating Capacitors Required No Autozeroing Capacitors Required >100dB of Simultaneous 50Hz and 60Hz Rejection Operate from a Single 2.7V or 5.25V Supply Selectable Input Range of ±200mV or ±2V Selectable Voltage Reference: Internal 2.048V or External Internal High-Accuracy Oscillator Needs No External Components Automatic Offset Calibration Low Power: Maximum 980µA Operating Current Small 32-Pin 7mm x 7mm TQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits), and 28-Pin DIP Package (3.5 Digits) Triplexed LCD Driver Evaluation Kit Available (Order MAX1494EVKIT)		Digital Multimeters Digital Panel Meters Digital Voltmeters Handheld meters

Application Notes

Application Note 2102: Migrating from Integrating ADC Architectures to Sigma Delta - MAX1491, MAX1491, MAX1493 Application Note 3418: Understanding the Effects of Clock Tolerances on 50/60Hz Noise Rejection in High Performance Sigma Delta ADCs - MAX1491, MAX1493, MAX1495 Application Note 3635: Implementing an External Reference and the Resulting Effect on Gain for the MAX149x Sigma-Delta Panel-Meter ADCs - MAX1491, MAX1493, MAX1495

Evaluation Kits

MAX1493EVKIT

Design Guides

A/D Converters (PDF)

Reliability Reports

Show FIT data for: MAX1491 MAX1493 MAX1495 Request Reliability Report for: MAX1491 MAX1493 MAX1495

Software/Models

none

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: 1-14 of 14
MAX1491	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1491CNI			PDIP;28 pin; Dwg: 21-0043 (PDF) Use pkgcode/variation: N28-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX1491CNI+			PDIP;28 pin; Dwg: 21-0043 (PDF) Use pkgcode/variation: N28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1491CAI+T				0°C to +70°C	See data sheet
MAX1491CAI			SSOP;28 pin; Dwg: 21-0056 (PDF) Use pkgcode/variation: A28-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX1491CAI-T				0°C to +70°C	See data sheet
MAX1491CAI+			SSOP;28 pin; Dwg: 21-0056 (PDF) Use pkgcode/variation: A28+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1493	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1493CCJ+			LQFP;32 pin; Dwg: 21-0054 (PDF) Use pkgcode/variation: C32+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1493CCJ-T				0°C to +70°C	See data sheet
MAX1493CCJ			LQFP;32 pin; Dwg: 21-0054 (PDF) Use pkgcode/variation: C32-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX1493CCJ+T				0°C to +70°C	See data sheet
MAX1495	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1495CCJ+T				0°C to +70°C	See data sheet
MAX1495CCJ-T				0°C to +70°C	See data sheet
MAX1495CCJ			LQFP;32 pin; Dwg: 21-0054 (PDF) Use pkgcode/variation: C32-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX1495CCJ+			LQFP;32 pin; Dwg: 21-0054 (PDF) Use pkgcode/variation: C32+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2004-03-16  Product Ad: MAX1491

Related Products

MAX1492, MAX1494 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers MAX1497, MAX1499 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface MAX1447, MAX1496, MAX1498 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers

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