MAX1497, MAX1499 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface

Description

The MAX1497/MAX1499 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated lightemitting diode (LED) 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 multiplexed LED display driver. An internal charge pump generates the negative supply needed to power the integrated input buffers for single-supply operation. The ADC is configurable for either a ±2V or ±200mV input range and it outputs its conversion results to an LED and/or to a microcontroller (µC). Microcontroller communication is possible through an SPI™-/QSPI™- /MICROWIRE™-compatible serial interface. The MAX1497 is a 3.5-digit (±1999 count) device and the MAX1499 is a 4.5-digit (±19,999 count) device.

The MAX1497/MAX1499 do not require external precision integrating capacitors, autozero 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, they use continuous internal offset-calibration and offer >100dB rejection of 50Hz and 60Hz line noise. Other features include data hold and peak detection, overrange and underrange detection, and a user-programmable low-battery monitor.

The MAX1499 is available in a 32-pin, 7mm x 7mm TQFP package and the MAX1497 is available in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the -40°C to +85°C extended temperature range.

An evaluation kit is available: MAX1499EVKIT

Key Features

Applications/Uses

High Resolution
- MAX1499: 4.5 Digits (±19,999 Count)
- MAX1497: 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 (Exclude LED Driver Current)
- Maximum 664µA Operating Current
- Maximum 268µA Shutdown Current
Small 32-Pin, 7mm x 7mm TQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
Also Available in a PDIP Package (3.5 Digits)
Multiplexed LED Drivers Resistor-Programmable Segment Current
SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
Extended Temperature Range (-40°C to +85°C)

	Digital Multimeters
	Digital Panel Meters
	Digital Voltmeters
	Handheld meters

Key Specifications: Dual-Slope & Display-Oriented ADCs

Part Number

Resolution
(±Counts)

Output Type

I_CC
(mA)

Ref.
(V)

V_SUPPLY
(V)

Package/Pins

Smallest Available Pckg.
(mm²)

Oper. Temp.
(°C)

Price

typ

max w/pins

See Notes

MAX1497

2000

Common Cathode

LED

Serial

Int./Ext.

2.7 to 5.25

PDIP(W)/28

SSOP/28

-40 to +85

$4.91 @1k

MAX1499

20000

LQFP/32

$7.13 @1k

See All Dual-Slope & Display-Oriented ADCs (31)

Diagram

Typical Operating Circuit

Application Notes

Application Note 2102: Migrating from Integrating ADC Architectures to Sigma Delta - MAX1497, MAX1499
Application Note 3418: Understanding the Effects of Clock Tolerances on 50/60Hz Noise Rejection in High Performance Sigma Delta ADCs - MAX1497, MAX1499

Evaluation Kits

MAX1499EVKIT

Reliability Reports

Show FIT data for:

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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: 1-11 of 11

MAX1497 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX1497EPI

Active PDIP(W);28 pin;593 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

MAX1497EPI+

Active PDIP(W);28 pin;593 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

MAX1497EAI

Active SSOP;28 pin;82 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis

MAX1497EAI-T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX1497EAI+

Active SSOP;28 pin;82 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1497EAI+T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX1499 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX1499EVC16

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX1499ECJ

Active LQFP;32 pin;83 mm²
Outline Drawing: 21-0054 (PDF)
Land Pattern: 90-0111 (PDF)
Use pkgcode/variation: C32-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis

MAX1499ECJ-T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX1499ECJ+T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX1499ECJ+

Active LQFP;32 pin;83 mm²
Outline Drawing: 21-0054 (PDF)
Land Pattern: 90-0111 (PDF)
Use pkgcode/variation: C32+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

More Information

New Product Press Release 2003-12-03

Related Products

MAX1497, MAX1499 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface
MAX1491, MAX1493, MAX1495 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers
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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Document Ref.: 19-3054; Rev 1a; 2004-02-23
This page last modified: 2009-10-08