MAX1447/MAX1496/MAX1498 19-3166 Rev 0 1/04 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers General Description Features The MAX1447/MAX1496/MAX1498 low-power, 3.5- and High Resolution 4.5-digit, analog-to-digital converters (ADCs) with inte- MAX1447/MAX1498: 4.5 Digits (19,999 Count) grated light-emitting diode (LED) drivers operate from a MAX1496: 3.5 Digits (1999 Count) single 2.7V to 5.25V power supply. They include an Sigma-Delta ADC Architecture internal reference, a high-accuracy on-chip oscillator, No Integrating Capacitors Required and a multiplexed LED display driver. An internal charge No Autozeroing Capacitors Required pump generates the negative supply needed to power >100dB of Simultaneous 50Hz and 60Hz the integrated input buffers for single-supply operation. Rejection The ADC is configurable for either a 2V or 200mV Selectable Input Range of 200mV or 2V input range and it outputs its conversion results to an LED. The MAX1496 is a 3.5-digit (1999 count) device Selectable Voltage Reference: Internal 2.048V or and the MAX1447/MAX1498 are 4.5-digit (19,999 External count) devices. Internal High-Accuracy Oscillator Needs No The MAX1447/MAX1496/MAX1498 do not require exter- External Components nal precision integrating capacitors, autozero capaci- Automatic Offset Calibration tors, crystal oscillators, charge pumps, or other circuitry On-Demand Enhanced Offset Calibration required with dual-slope ADCs (commonly used in (MAX1447) panel meter circuits). Operate from a Single 2.7V to 5.25V Supply These devices also feature on-chip buffers for the dif- ferential signal and reference input, allowing direct Low Power (Exclude LED-Driver Current) interface with high-impedance signal sources. In addi- Maximum 744A Operating Current (MAX1496) tion, they use continuous internal offset-calibration and Maximum 960A Operating Current offer >100dB rejection of 50Hz and 60Hz line noise. (MAX1447/MAX1498) Other features include data hold and peak detection Maximum 325A Shutdown Current and overrange/underrange detection. The MAX1447 Multiplexed Common-Cathode LED Drivers features on-demand enhanced offset calibration for Resistor-Programmable Segment Current improved offset performance. Small 32-Pin, 7mm x 7mm TQFP Package (4.5 The MAX1447/MAX1498 are available in a 32-pin, 7mm Digits), 28-Pin SSOP Package (3.5 Digits) 7mm TQFP package and the MAX1496 is available in Also Available in a PDIP Package (3.5 Digits) 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the -40C to +85C extended temperature range. Applications Ordering Information Digital Panel Meters PIN- RESOLUTION PART TEMP RANGE Hand-Held Meters PACKAGE (DIGITS) Digital Voltmeters MAX1447ECJ -40C to +85C 32 TQFP 4.5 MAX1496EAI* -40C to +85C 28 SSOP 3.5 Digital Multimeters MAX1496EPI -40C to +85C 28 PDIP 3.5 Pin Configurations appear at end of data sheet. MAX1498ECJ -40C to +85C 32 TQFP 4.5 *Future productcontact factory for availability. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers ABSOLUTE MAXIMUM RATINGS AV to GND (MAX1447/MAX1498)........................-0.3V to +6V VLED to GLED..........................................................-0.3V to +6V DD DV to GND (MAX1447/MAX1498)........................-0.3V to +6V GLED to GND........................................................-0.3V to +0.3V DD AIN+, AIN- to GND SEG to GLED..........................................-0.3V to (VLED + 0.3V) (MAX1447/MAX1498) ......................VNEG to (AV to +0.3V) DIG to GLED ..........................................-0.3V to (VLED + 0.3V) DD REF+, REF- to GND DIG Sink Current .............................................................300mA (MAX1447/MAX1498) ..................... VNEG to (AV to +0.3V) DIG Source Current...........................................................50mA DD INTREF, RANGE, DPSET1, DPSET2, HOLD, PEAK, SEG Sink Current ..............................................................50mA DPON to GND (MAX1447/MAX1498) ..-0.3V to (DV + 0.3V) SEG Source Current..........................................................50mA DD VNEG to GND (MAX1447/MAX1498).......-2.6V to (AV + 0.3V) Maximum Current Input into Any Other Pin ........................50mA DD LED EN to GND (MAX1447/MAX1498)...-0.3V to (DV + 0.3V) Continuous Power Dissipation (T = +70C) DD A ISET to GND (MAX1447/MAX1498) .........-0.3V to (AV + 0.3V) 32-Pin TQFP (derate 20.7mW/C above +70C).....1652.9mW DD V to GND (MAX1496)...........................................-0.3V to +6V 28-Pin SSOP (derate 9.5mW/C above +70C) ...........762mW DD AIN+, AIN- to GND (MAX1496)..............VNEG to (V to +0.3V) 28-Pin PDIP (derate 14.3mW/C above +70C)......1142.9mW DD REF+, REF- to GND (MAX1496) ........... VNEG to (V to +0.3V) Operating Temperature Range ...........................-40C to +85C DD INTREF, RANGE, DPSET1, DPSET2, HOLD, PEAK, Junction Temperature......................................................+150C DPON to GND (MAX1496) .....................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD VNEG to GND (MAX1496)..........................-2.6V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD ISET to GND (MAX1496) ............................-0.3V to (V + 0.3V) DD Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (AV = DV = V = +2.7V to +5.25V, GND = 0, V = +2.7V to +5.25V, GLED = 0, V - V = 2.048V (external reference), DD DD DD LED REF+ REF- C = C = 0.1F, C = 0.1F. Internal clock mode, unless otherwise noted. All specifications are at T = T to T . REF+ REF- VNEG A MIN MAX Typical values are at T = +25C, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY MAX1447/MAX1498 -19,999 +19,999 Noise-Free Resolution Counts MAX1496 -1999 +1999 2.000V range 1 Integral Nonlinearity (Note 1) INL Counts 200mV range 1 (V - V = 0.100V) on 200mV range AIN+ AIN- Range Change Ratio 10:1 Ratio (V - V = 0.100V) on 2.0V range AIN+ AIN- V - V = full scale AIN+ AIN- Rollover Error 1 Counts V - V = full scale AIN- AIN+ Output Noise 10 V P-P Offset Error (Zero Input Reading) Offset V = 0 (Note 2) -0 0 Readin gs IN Gain Error (Note 3) -0.5 +0.5 % FSR Offset Drift (Zero Reading Drift) V = 0 (Note 4) 0.1 V/C IN Gain Drift 1 ppm/C INPUT CONVERSION RATE Conversion Rate 5Hz 2 MAX1447/MAX1496/MAX1498