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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.

An evaluation kit is available:  MAX1493EVKIT  

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

Diagram

Typical Operating Circuit

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

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	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1491CNI			Active	PDIP(N);28 pin;289.5 mm² Outline Drawing: 21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N28-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX1491CNI+			Active	PDIP(N);28 pin;289.5 mm² Outline Drawing: 21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: N28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1491CAI+T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX1491CAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX1491CAI-T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX1491CAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1493	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1493CCJ			Active	LQFP;32 pin;82.8 mm² Outline Drawing: 21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX1493CCJ-T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX1493CCJ+T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX1493CCJ+			Active	LQFP;32 pin;82.8 mm² Outline Drawing: 21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1495	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1495CCJ			Active	LQFP;32 pin;82.8 mm² Outline Drawing: 21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX1495CCJ-T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX1495CCJ+T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX1495CCJ+			Active	LQFP;32 pin;82.8 mm² Outline Drawing: 21-0054 (PDF) Land Pattern: 90-0111 (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 More Like This: View Product Families for Similar Products See All Dual-Slope & Display-Oriented ADCs (31 Products)

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