NJU9252P 2-DIGIT SINGLE CHIP A/D CONVERTER QGENERAL DESCRIPTION The NJU9252P is a low operating current, high performance 2-digit single chip A/D converter containing a sample/hold circuit, an oscillator, a 7-segment decoder, LED display driver and a control circuit. The LED display changes by the high-speed sampling rate of 4 times/s (typ). The NJU9252P realizes to apply with few external components, therefore it is most suited for digital meters, digital thermometers and the others. QPACKAGE OUTLINE QFEATURES O8bit Resolution, Successive Approximation Method OLow Input Current ( 1A typ ) ODynamic LED direct drive OSampling-rate ( 4 times/s typ ) OSample/Hold Circuit On-Die OCR Oscillation Circuit On-Die OPower-on Initialization OOffset Adjustment Terminal OLow operating current OApplicable with Few External Components OC-MOS technology OPackage DMP20 QPAD LOCATION NJU9252PM DMP20 SEG D SEG C SEG B SEG A SEG F SEG G SEG E NC COM1 VSS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VDD VREF INH INL INR OFFSET 2 OFFSET 1 NC TEST COM2 NJU9252P QBLOCK DIAGRAM INH INL BIN SAMPLE & HOLD DIF AMP COMP BCD SEGMENT DECODER LATCH INR OFFSET 1 DIV LAT OFFSET 2 DAC VREF VDD VSS SHIFT REGISTER MULTI PLEXER POWER ON RESET OSC CLOCK TEST QTERMINAL DESCRIPTION SYMBOL FUNCTION SEG D LED Segment Driver D output ( Pch open-drain ) SEG C LED Segment Driver C output ( Pch open-drain ) SEG B LED Segment Driver B output ( Pch open-drain ) SEG A LED Segment Driver A output ( Pch open-drain ) SEG F LED Segment Driver F output ( Pch open-drain ) SEG G LED Segment Driver G output ( Pch open-drain ) SEG E LED Segment Driver E output ( Pch open-drain ) COM1 LED Common Driver output 1 ( Nch open-drain ) VSS GND COM2 LED Common Driver output 2 ( Nch open-drain ) TEST Test Terminal OFFSET 1 Offset Adjustment Terminal 1 OFFSET 2 Offset Adjustment Terminal 2 INR Input Gain setup Resistor Connecting Terminal INL Analog Differential Input ( Lo ) INH Analog Differential Input ( Hi ) VREF Reference Voltage VDD Supply Voltage NC Non Connection COMMON DRIVER COM 1 2 (Nch OPEN DRAIN) SEGMENT DRIVER SEG A B C D E F G (Pch OPEN DRAIN) NJU9252P QABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL RATING UNIT Supply Voltage VDD -0.3 to +7.0 V Analog Input Voltage VIN GND to VREF V Reference Input Voltage VREF GND to VDD V Power Dissipation PD 500 mW Topr -20 to +75 Operating Temperature Range C Tstg -40 to +125 Storage Temperature Range C Note1) The input current is limited to 100A when the input voltage is more than supply voltage. QELECTRICAL CHARACTERISTICS (VDD=5V, Ta=25C) SYMBOL CONDITIONS MIN TYP MAX UNIT VDD 4.5 5.0 5.5 V VIN=2.475V, VREF=3.2V 98 98/99 99 Counts N99 Full Scale=2.475V Note2) DL 0.5 2 LSB EOFF VREF=3.2V 1 2 LSB Note3) VIN=0.0V 30 V Noise ( P-P Value ) VNI Full Scale=2.475V Leakage Current IL VIN=0.0V 1 5 A VIN=0.0V, VREF=3.2V, 0.2 1 V/C Zero Reading Drift ZD -20<Ta<+75C Scale Factor VIN=2.475V, VREF=3.2V, ppm Ftemp 1 5 Temperature Coefficient -20<Ta<+75C (Ext.ref, 0ppm/C) /C Sampling-rate Ts 3 4 5 times/s Operating Current IDD VIN=0.0V 0.8 1.8 mA Segment Voltage=3V IS1 10 14 mA SEG A to SEG G Terminals Segment Sink Current Segment Voltage=3V 70 98 mA IS2 COM1, COM2 Terminals Note2) Linearity indicates an error of the input-output linearity characteristics getting with the two read data of zero and full scale input values. Note3) The peak value of noise must be kept within this value during 95% period in the measurement time. PARAMETER Operating Voltage Ratiometric Reading Linearity Offset NJU9252P QTIMING CHART Internal Clock COM1 COM2 SEG A SEG B SEG C SEG D SEG E SEG F SEG G TCONV Note4) SEG A to SEG G are an example to display " 25 ". The duty of COM1 and COM2 are 50% respectively. COM1 and COM2 are Nch-FET open-drain type, SEG A to SEG G are Pch-FET open-drain type. : The state of Output Terminal is high impedance. NJU9252P QDISPLAY PATTERN 0 1 2 3 4 5 6 7 8 9 QAPPLICATION CIRCUIT ( Ex. NJU9252PM) OThermometer Thermistor 1uF Zero Adj. Offset Adj. 10k +5V 12 11 9 10 13 14 15 16 17 18 19 20 Full-Scale Adj. 8 NC 7 6 5 4 3 2 NJU9252PM 1 10uF NC 10k LED (CATHODE COMMON) [CAUTION] The specifications on this data book are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this data book are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: NJR: NJU9252AM