MAX1497 Maxim, MAX1497 Datasheet
MAX1497
Manufacturer Part Number
MAX1497
Description
3.5- and 4.5-Digit / Single-Chip ADCs with LED Drivers and C Interface
Manufacturer
Maxim
Datasheet
1.MAX1497.pdf
(33 pages)
Available stocks
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Part Number:
MAX14972CTG+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX1497ECSA
Manufacturer:
MAXIM/美信
Quantity:
20 000
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). µC 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
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.
19-3054; Rev 0; 11/03
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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.
Pin Configurations appear at end of data sheet.
Digital Panel Meters
Hand-Held Meters
Digital Voltmeters
Digital Multimeters
3.5- and 4.5-Digit, Single-Chip ADCs with LED
________________________________________________________________ Maxim Integrated Products
General Description
Applications
✕
7mm
Drivers and µC Interface
o High Resolution
o Sigma-Delta ADC Architecture
o Operate from a Single 2.7V or 5.25V Supply
o Selectable Input Range of ±200mV or ±2V
o Selectable Voltage Reference: Internal 2.048V or
o Internal High-Accuracy Oscillator Needs No
o Automatic Offset Calibration
o Low Power (Exclude LED Driver Current)
o Small 32-Pin, 7mm x 7mm TQFP Package (4.5
o Also Available in a PDIP Package (3.5 Digits)
o Multiplexed LED Drivers
o SPI-/QSPI-/MICROWIRE-Compatible Serial
o Extended Temperature Range (-40°C to +85°C)
*Future product—contact factory for availability.
MAX1497EAI*
MAX1497EPI
MAX1499ECJ* -40°C to +85°C 32 TQFP
External
External Components
Digits), 28-Pin SSOP Package (3.5 Digits)
Interface
MAX1499: 4.5 Digits (±19,999 Count)
MAX1497: 3.5 Digits (±1999 Count)
No Integrating Capacitors Required
No Autozeroing Capacitors Required
>100dB of Simultaneous 50Hz and 60Hz
Rejection
Maximum 664µA Operating Current
Maximum 268mA Shutdown Current
Resistor-Programmable Segment Current
PART
-40°C to +85°C 28 SSOP
-40°C to +85°C 28 PDIP
TEMP RANGE
Ordering Information
PIN-
PACKAGE
Features
RESOLUTION
(DIGITS)
3.5
3.5
4.5
1
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