MAX1496EAI+ Maxim Integrated Products, MAX1496EAI+ Datasheet

IC ADC 3.5DIGIT LED DRVR 28-SSOP

MAX1496EAI+

Manufacturer Part Number
MAX1496EAI+
Description
IC ADC 3.5DIGIT LED DRVR 28-SSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1496EAI+

Number Of Bits
3.5 Digit
Sampling Rate (per Second)
5
Number Of Converters
1
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
28-pin SSOP and 28-pin PDIP packages. All devices in
this family operate over the -40°C to +85°C extended
temperature range.
19-3166; Rev 0; 1/04
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.
Pin Configurations appear at end of data sheet.
7mm TQFP package and the MAX1496 is available in
Digital Panel Meters
Hand-Held Meters
Digital Voltmeters
Digital Multimeters
________________________________________________________________ Maxim Integrated Products
General Description
3.5- and 4.5-Digit, Single-Chip ADCs
Applications
♦ High Resolution
♦ Sigma-Delta ADC Architecture
♦ Selectable Input Range of ±200mV or ±2V
♦ Selectable Voltage Reference: Internal 2.048V or
♦ Internal High-Accuracy Oscillator Needs No
♦ Automatic Offset Calibration
♦ On-Demand Enhanced Offset Calibration
♦ Operate from a Single 2.7V to 5.25V Supply
♦ Low Power (Exclude LED-Driver Current)
♦ Multiplexed Common-Cathode LED Drivers
♦ Small 32-Pin, 7mm x 7mm TQFP Package (4.5
♦ Also Available in a PDIP Package (3.5 Digits)
*Future product—contact factory for availability.
MAX1447ECJ
MAX1496EAI*
MAX1496EPI
MAX1498ECJ
External
External Components
(MAX1447)
Digits), 28-Pin SSOP Package (3.5 Digits)
PART
MAX1447/MAX1498: 4.5 Digits (±19,999 Count)
MAX1496: 3.5 Digits (±1999 Count)
No Integrating Capacitors Required
No Autozeroing Capacitors Required
>100dB of Simultaneous 50Hz and 60Hz
Rejection
Maximum 744µA Operating Current (MAX1496)
Maximum 960µA Operating Current
(MAX1447/MAX1498)
Maximum 325µA Shutdown Current
Resistor-Programmable Segment Current
with LED Drivers
-40°C to +85°C 32 TQFP
-40°C to +85°C 28 SSOP
-40°C to +85°C 28 PDIP
-40°C to +85°C 32 TQFP
TEMP RANGE
Ordering Information
PIN-
PACKAGE
Features
RESOLUTION
(DIGITS)
4.5
3.5
3.5
4.5
1

Related parts for MAX1496EAI+

MAX1496EAI+ Summary of contents

Page 1

... Digital Panel Meters Hand-Held Meters Digital Voltmeters Digital Multimeters Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. ♦ High Resolution MAX1447/MAX1498: 4.5 Digits (±19,999 Count) MAX1496: 3.5 Digits (± ...

Page 2

Single-Chip ADCs with LED Drivers ABSOLUTE MAXIMUM RATINGS AV to GND (MAX1447/MAX1498) ........................-0. GND (MAX1447/MAX1498)........................-0.3V to +6V DD AIN+, AIN- to GND (MAX1447/MAX1498) ......................VNEG to (AV REF+, REF- to GND (MAX1447/MAX1498) ..................... ...

Page 3

Single-Chip ADCs ELECTRICAL CHARACTERISTICS (continued) ( +2.7V to +5.25V, GND = 0.1µ 0.1µF. Internal clock mode, unless otherwise noted. All specifications ...

Page 4

Single-Chip ADCs with LED Drivers ELECTRICAL CHARACTERISTICS (continued) ( +2.7V to +5.25V, GND = 0.1µ 0.1µF. Internal clock mode, unless otherwise ...

Page 5

Single-Chip ADCs ELECTRICAL CHARACTERISTICS (continued) ( +2.7V to +5.25V, GND = 0.1µ 0.1µF. Internal clock mode, unless otherwise noted. All specifications ...

Page 6

Single-Chip ADCs with LED Drivers ( +2.7V to +5.25V, GND = 0, GLED = 0, external reference mode, REF+ = 2.048V, REF- = GND LED RANGE = ...

Page 7

Single-Chip ADCs ( +2.7V to +5.25V, GND = 0, GLED = 0, external reference mode, REF+ = 2.048V, REF- = GND LED RANGE = 1, internal clock ...

Page 8

Single-Chip ADCs with LED Drivers ( +2.7V to +5.25V, GND = 0, GLED = 0, external reference mode, REF+ = 2.048V, REF- = GND LED RANGE = ...

Page 9

Single-Chip ADCs PIN NAME MAX1447/ MAX1496 MAX1498 1 31 VNEG -2.5V Charge-Pump Voltage Output. Connect a 0.1µF capacitor to GND. Negative Reference Voltage Input. For internal-reference operation, connect REF- to GND. For external-reference operation, bypass REF- to ...

Page 10

Single-Chip ADCs with LED Drivers PIN NAME MAX1447/ MAX1496 MAX1498 19 18 DIG3 Digit 3 Driver 20 20 SEGA Segment A Driver 21 21 SEGB Segment B Driver 22 22 SEGC Segment C Driver 23 23 SEGD ...

Page 11

Single-Chip ADCs +2.5V AIN+ AIN- INPUT BUFFERS REF+ REF- -2.5V Figure 1. MAX1447/MAX1498 Functional Diagram The MAX1447/MAX1496/MAX1498 perform analog-to- digital conversions using a single-bit, 3rd-order, sigma- delta modulator. The sigma-delta modulator converts the ...

Page 12

Single-Chip ADCs with LED Drivers 0 -40 -80 -120 -160 -200 FREQUENCY (Hz) Figure 2. Frequency Response of the SINC and 60Hz) Filter Characteristics Figure 2 shows the filter frequency response. The ...

Page 13

Single-Chip ADCs SEGDP SEGG SEGF SEGE SEGD SEGC SEGB SEGA DIGIT Figure 5. Two-Digit Common-Cathode Configuration DIGIT 4 (MSD) ...

Page 14

Single-Chip ADCs with LED Drivers Decimal-Point Control The MAX1447/MAX1496/MAX1498 allow for full deci- mal-point control and feature leading-zero suppression. Use the DPON, DPSET1, and DPSET2 bits in the con- trol register to set the value of the ...

Page 15

Single-Chip ADCs For external-reference operation, set INTREF to GND. REF+ and REF- are fully differential. For a valid exter- nal-reference input, V must be greater than V REF+ Bypass REF+ and REF- with a 0.1µF or greater ...

Page 16

Single-Chip ADCs with LED Drivers The MAX1447/MAX1496/MAX1498 feature data-hold circuitry. When activated (HOLD is set to AV MAX1447/MAX1498 for the MAX1496), the DD device holds the current reading on the LED. Strain-Gauge Measurement Connect ...

Page 17

Single-Chip ADCs The transfer function for the MAX1496 with AIN+ - AIN- ≥ 0, RANGE = GND is:  V − AIN = COUNT 1 024 .   V − REF The ...

Page 18

Single-Chip ADCs with LED Drivers Selecting Segment Current A resistor from ISET to ground sets the current for each LED segment. See Table 5 for more detail. Use the fol- lowing formula to set the segment current: ...

Page 19

Single-Chip ADCs ( max = (+125°C) - (+85°C) = +40° (max) = +40°C /+105.3°C/W = 380mW (VLED - [380mW - (5.25V x 2mA) - 5.25V x DIODE 1.080mA] / ...

Page 20

Single-Chip ADCs with LED Drivers V IN 10µF 0.1µF 0.1µF L ISO 2.7V TO 10µF 5.25V V IN 10µF 0.1µF 2.7V TO 5.25V 20 ______________________________________________________________________________________ SEGA–SEGDP AIN+ SEGMENT CONNECTIONS AIN- VLED MAX1447 DV DD MAX1498 AV DD ...

Page 21

Single-Chip ADCs TOP VIEW VNEG 1 REF- 2 REF AIN+ 5 AIN- MAX1496 6 I SET GND INTREF 9 RANGE 10 DPSET1 11 DPSET2 12 PEAK 13 HOLD 14 SSOP/PDIP Chip ...

Page 22

Single-Chip ADCs with LED Drivers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 22 ______________________________________________________________________________________ Package Information ...

Page 23

Single-Chip ADCs (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages NOTES: 1. D&E DO NOT INCLUDE ...

Page 24

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products Package Information (continued) ...

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