Rainbow-electronics MAX1499 Manual do Utilizador Página 1

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX1499. Rainbow Electronics MAX1499 User Manual Manual do Utilizador

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General Description
The MAX1497/MAX1499 low-power, 3.5- and 4.5-digit,
analog-to-digital converters (ADCs) with integrated light-
emitting diode (LED) drivers operate from a single 2.7V
to 5.25V power supply. They include an internal refer-
ence, a high-accuracy on-chip oscillator, and a multi-
plexed 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 preci-
sion 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 dif-
ferential signal and reference inputs, allowing direct
interface with high-impedance signal sources. In addi-
tion, 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-pro-
grammable low-battery monitor.
The MAX1499 is available in a 32-pin, 7mm
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 tem-
perature range.
Applications
Digital Panel Meters
Hand-Held Meters
Digital Voltmeters
Digital Multimeters
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)
MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and µC Interface
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3054; Rev 1a; 2/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART
TEMP RANGE
PIN-
PACKAGE
RESOLUTION
(DIGITS)
MAX1497EAI*
-40°C to +85°C
28 SSOP 3.5
MAX1497EPI
-40°C to +85°C
28 PDIP 3.5
MAX1499ECJ
-40°C to +85°C
32 TQFP 4.5
Pin Configurations appear at end of data sheet.
*Future product—contact factory for availability.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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Resumo do Conteúdo

Página 1 - Drivers and µC Interface

General DescriptionThe MAX1497/MAX1499 low-power, 3.5- and 4.5-digit,analog-to-digital converters (ADCs) with integrated light-emitting diode (LED) dr

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MAX1497/MAX14993.5- and 4.5-Digit, Single-Chip ADCs with LEDDrivers and µC Interface10 _______________________________________________________________

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MAX1497/MAX14993.5- and 4.5-Digit, Single-Chip ADCs with LEDDrivers and µC Interface__________________________________________________________________

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MAX1497/MAX14993.5- and 4.5-Digit, Single-Chip ADCs with LEDDrivers and µC Interface__________________________________________________________________

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MAX1497/MAX14993.5- and 4.5-Digit, Single-Chip ADCs with LEDDrivers and µC Interface__________________________________________________________________

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MAX1497/MAX14993.5- and 4.5-Digit, Single-Chip ADCs with LEDDrivers and µC Interface__________________________________________________________________

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The transfer function for the MAX1499 with AIN+ - AIN-< 0, RANGE = 0 is:The transfer function for the MAX1497 with AIN+ - AIN-≥ 0, RANGE = 0 is:The

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MAX1497/MAX14993.5- and 4.5-Digit, Single-Chip ADCs with LEDDrivers and µC Interface28 _______________________________________________________________

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DefinitionsINLIntegral nonlinearity (INL) is the deviation of the values onan actual transfer function from a straight line. This straightline is eith

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MAX1497/MAX14993.5- and 4.5-Digit, Single-Chip ADCs with LEDDrivers and µC InterfaceMaxim cannot assume responsibility for use of any circuitry other

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INTERNAL REFERENCE VOLTAGEvs. TEMPERATUREMAX1497/99 toc16TEMPERATURE (°C)REFERENCE VOLTAGE (V)6050403020102.0462.0452.0472.0492.0482.0512.0502.0532.05

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MAX1497/MAX14993.5- and 4.5-Digit, Single-Chip ADCs with LEDDrivers and µC Interface__________________________________________________________________

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