NTE2050 & NTE2051 Integrated Circuit 1 3 / Digit Single Chip A/D Converter 2 Description: The NTE2050 and NTE2051 are high performance, low power 31/2 digit A/D converters containing all the necessary active devices on a single CMOS IC. Included are seven segment decoders, display drivers, reference and a clock. The NTE2051 is designed to interface with a liquid crystal display (LCD) and includes a backplane drive the NTE2050 will directly drive an instrumentsize light emit- ting diode (LED) display. The NTE2050 and NTE2051 bring together an unprecedented combination of high accuracy, versatil- ity, and true economy. High accuracy like autozero to less than 10 V, zero drift of less than 1 V/C, input bias current of 10pA max., and rollover error of less than one count. The versatility of true differ- ential input and reference is useful in all systems, but gives the designer an uncommon advantage when measuring load cells, strain gauges and other bridgetype transducers. And, finally, the true economy of single power supply operation (NTE2051), enabling a high performance panel meter to be built with the addition of only 7 passive components and a display. Features: Guaranteed Zero Reading for 0 Volts Input on all Scales True Polarity at Zero for Precise Null Detection Input Current: 1pA Typ True Differential Input and Reference Direct Display Drive No External Components Required: NTE2050 (LED) NTE2051 (LCD) Low Noise Less than 15 V PP OnChip Clock and Reference Low Power Dissipation Typically Less than 10mW No Additional Active Circuits RequiredAbsolute Maximum Ratings: Supply Voltage, NTE2051, V+ to V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V NTE2050, V+ to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V NTE2050, V to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V Analog Input Voltage (Either Input, Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ to V Reference Input Voltage (Either Input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ to V Clock Input, NTE2051 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TEST to V+ NTE2050 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to V+ Power Dissipation (Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mW Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to +160C Lead Temperature (During Soldering, 60sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300C Note 1. Stresses above 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 another conditions above those indicated in the operational section of the specifi- cation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2. Input voltages may exceed the supply voltages provided the input current is limited to 100 A. Note 3. Dissipation rating assumes device is mounted with all leads soldered to printed circuit board. Electrical Characteristics: (T = +25C, f = 48kHz unless otherwise specified) A clock Parameter Test Conditions Min Typ Max Unit Zero Input Reading V = 0V 000.0 000.0 +000.0 Digital Reading IN Full Scale = 200mV Ratiometric Reading V = V 999 999/1000 1000 Digital Reading IN REF V = 100mV REF Rollover Error (Difference in V = +V 200mV 1 .2 +1 Counts IN IN Reading for Equal Positive and Negative Reading near Full Scale) Linearity (Maximum Deviation Full Scale = 200mV 1 .2 +1 Counts from Best Straight Line Fit) or Full Scale = 2V Common Mode Rejection Ratio V = 1V, V = 0V 50 V/V CM IN Full Scale = 200mV Noise (PeakPeak Value not V = 0V 15 V IN Exceeded 95% of Time) Full Scale = 200mV Leakage Current Input V = 0 1 10 pA IN Zero Reading Drift V = 0, 0 < T < +70C 0.2 1.0 V/C IN A Scale Factor Temperature V = 199.0mV 1 5 ppm/C IN Coefficient 0 < T < +70C A (Ext. Ref. 0ppm/C) V+ Supply Current (Does Not V = 0 0.8 1.8 mA IN Include LED Current for NTE2050) V Supply Current (NTE2050 Only) 0.6 1.8 mA