MAX1447 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers

19-3166; Rev 0; 1/04
3.5- and 4.5-Digit, Single-Chip ADCs
with LED Drivers
General Description
The MAX1447/MAX1496/MAX1498 low-power, 3.5- and
4.5-digit, analog-to-digital converters (ADCs) with inte-
grated light-emitting 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. The MAX1496 is a 3.5-digit (±1999 count) device
and the MAX1447/MAX1498 are 4.5-digit (±19,999
count) devices.
The MAX1447/MAX1496/MAX1498 do not require exter-
nal precision integrating capacitors, autozero capaci-
tors, 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 input, 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
and overrange/underrange detection. The MAX1447
features on-demand enhanced offset calibration for
improved offset performance.
The MAX1447/MAX1498 are available in a 32-pin, 7mm
✕ 7mm TQFP package and the MAX1496 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.
Digital Panel Meters
Hand-Held Meters
Digital Voltmeters
Digital Multimeters
Applications
Pin Configurations appear at end of data sheet.
Features
♦ High Resolution
MAX1447/MAX1498: 4.5 Digits (±19,999 Count)
MAX1496: 3.5 Digits (±1999 Count)
♦ Sigma-Delta ADC Architecture
No Integrating Capacitors Required
No Autozeroing Capacitors Required
>100dB of Simultaneous 50Hz and 60Hz
Rejection
♦ 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
♦ On-Demand Enhanced Offset Calibration
(MAX1447)
♦ Operate from a Single 2.7V to 5.25V Supply
♦ Low Power (Exclude LED-Driver Current)
Maximum 744µA Operating Current (MAX1496)
Maximum 960µA Operating Current
(MAX1447/MAX1498)
Maximum 325µA Shutdown Current
♦ Multiplexed Common-Cathode LED Drivers
Resistor-Programmable Segment 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)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
RESOLUTION
(DIGITS)
MAX1447ECJ -40°C to +85°C 32 TQFP
4.5
MAX1496EAI* -40°C to +85°C 28 SSOP
3.5
MAX1496EPI -40°C to +85°C 28 PDIP
3.5
MAX1498ECJ -40°C to +85°C 32 TQFP
4.5
*Future product—contact factory for availability.
________________________________________________________________ Maxim Integrated Products 1
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