MAX1492, MAX1494 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

Description

The MAX1492/MAX1494 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 outputs its conversion results to an LCD and/or to a microcontroller (µC). µC communication is facilitated through an SPI™-/QSPI™-/MICROWIRE™-compatible serial interface. The MAX1492 is a 3.5-digit (±1999 count) device, and the MAX1494 is a 4.5-digit (±19,999 count) device.

The MAX1492/MAX1494 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 simultaneous rejection of 50Hz and 60Hz line noise. Other features include data hold and peak hold, overrange and underrange detection, and a lowbattery monitor.

The MAX1494 comes in a 32-pin, 7mm x 7mm TQFP package, and the MAX1492 comes in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the 0°C to +70°C commercial temperature range.

An evaluation kit is available: MAX1494EVKIT

Key Features

Applications/Uses

High Resolution
- MAX1494: 4.5 Digits (±19,999 Count)
- MAX1492: 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 960µA Operating Current
- Maximum 400µA Shutdown Current
Small 32-Pin 7mm x 7mm TQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
Triplexed LCD Driver
SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
Evaluation Kit Available (Order MAX1494EVKIT)

	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

MAX1492

2000

LCD

Serial

Triplexed LCD

Int./Ext.

2.7 to 5.25

PDIP(N)/28

SSOP/28

0 to +70

$4.91 @1k

MAX1494

20000

LQFP/32

$6.57 @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 - MAX1492, MAX1494
Application Note 3418: Understanding the Effects of Clock Tolerances on 50/60Hz Noise Rejection in High Performance Sigma Delta ADCs - MAX1492, MAX1494
Application Note 3775: Design Considerations for a Low-Cost Sensor and A/D Interface - MAX1492, MAX1494

Evaluation Kits

MAX1494EVKIT

Reliability Reports

Show FIT data for:

Request Reliability Report for:

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

MAX1492 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX1492CNI

Active PDIP(N);28 pin;290 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

MAX1492CNI+

Active PDIP(N);28 pin;290 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

MAX1492CAI+

Active SSOP;28 pin;82 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

MAX1492CAI

Active SSOP;28 pin;82 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

MAX1492CAI-T

Active

Land Pattern: Not Available

0°C to +70°C See data sheet

MAX1492CAI+T

Active

Land Pattern: Not Available

0°C to +70°C See data sheet

MAX1494 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX1494EVC16

Active

Land Pattern: Not Available

0°C to +70°C See data sheet

MAX1494CCJ

Active LQFP;32 pin;83 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

MAX1494CCJ-T

Active

Land Pattern: Not Available

0°C to +70°C See data sheet

MAX1494CCJ+T

Active

Land Pattern: Not Available

0°C to +70°C See data sheet

MAX1494CCJ+

Active LQFP;32 pin;83 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

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.: 19-2959; Rev 3; 2004-05-31
This page last modified: 2009-10-13