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MAX1497, MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface
3.5- and 4.5-Digit ADC, LED Display Drivers Reduce Time and Save Board Space
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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: MAX1499EVKIT
Key Features
- 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)
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Applications/Uses
- Digital Multimeters
- Digital Panel Meters
- Digital Voltmeters
- Handheld meters
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Key Specifications:
| Display-Oriented ADCs |
| Part Number |
Resolution
(±Counts) |
Conv. Rate
(ksps) |
Data Bus
(bits) |
Diff/S.E. Input |
Internal VREF
(V) |
External VREF
(V) |
External VREF
(V) |
Bipolar VIN
(±V) |
INL
(±LSB) |
Package/Pins |
Budgetary Price |
| max |
nominal |
min |
max |
max |
See Notes |
| MAX1497 |
2000 |
0.005 |
7-Segment |
Diff. Only |
2.048 |
0 |
2.048 |
2 |
1 |
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$6.75 @1k |
| MAX1499 |
20000 |
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$9.80 @1k |
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See All Display-Oriented ADCs (33)
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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.
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Diagram
Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
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| Request Reliability Report for: |
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Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1497EAI
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1497EAI+
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1497EAI+T
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Active |
SSOP;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1497EAI-T
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Active |
SSOP;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1497EPI
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Active |
PDIP(W);28 pin;592.6 mm²
Outline Drawing:21-0044 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P28-3*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1497EPI+
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Active |
PDIP(W);28 pin;592.6 mm²
Outline Drawing:21-0044 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P28+3*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1499ECJ
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Active |
LQFP;32 pin;82.8 mm²
Outline Drawing:21-0054 (PDF)
Land Pattern: 90-0111 (PDF)
Use pkgcode/variation: C32-2*
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-40°C to +85°C
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See data sheet
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| MAX1499ECJ+
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Active |
LQFP;32 pin;82.8 mm²
Outline Drawing:21-0054 (PDF)
Land Pattern: 90-0111 (PDF)
Use pkgcode/variation: C32+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1499ECJ+T
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Active |
LQFP;32 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1499ECJ-T
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Active |
LQFP;32 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1499EVC16
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Active |
KIT;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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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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More Information
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Information Index
Document Ref.: 19-3054
Rev 1a;
2004-02-23
This page last modified: 2009-10-08
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