TC7117 TelCom, TC7117 Datasheet
TC7117
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TC7117 Summary of contents
Page 1
... P-P The auto-zero cycle guarantees a zero display reading with a 0V input. The TC7116A and TC7117A feature a precision, low- drift internal reference, and are functionally identical to the TC7116/TC7117. A low-drift external reference is not normally required with the TC7116A/TC7117A. ...
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... V to GND ............................– 9V Analog Input Voltage (Either Input) (Note 1) ........ V Reference Input Voltage (Either Input) ................. V Clock Input TC7116/TC7116A ..................................... TEST to V TC7117/TC7117A ...................................... GND to V Package Power Dissipation (Note 2) A CerDIP ..............................................................2.29W Plastic DIP ........................................................1.23W Plastic Chip Carrier (PLCC) ..............................1.23W Plastic Quad Flat Package (PQFP) ..................1.00W ...
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... Average DC component is less than 50 mV. 6. The TC7116/TC7116A logic inputs have an internal pull-down resistor connected from HLDR, pin 1 to TEST, pin 37. The TC7117/TC7117A logic inputs have an internal pull-down resistor connected from HLDR, pin 1 to GND, pin 21. TELCOM SEMICONDUCTOR, INC. Test Conditions " ...
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... OSC TEST + REF REF 34 7 – REF TC7116IJL 9 32 COMMON 2 TC7116AIJL + TC7117IJL IN TC7117AIJL V – (CerDIP BUFF INT V – 100 ...
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... AB Activates both halves of the 1 in the thousands display. 4 POL Activates the negative polarity display. BP LCD backplane drive output (TC7116/TC7116A). GND Digital ground (TC7117/TC7117A). G Activates the G section of the hundreds display Activates the A section of the hundreds display Activates the C section of the hundreds display. ...
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... TC7116 TC7116A TC7117 TC7117A PIN DESCRIPTION (Cont.) 40-Pin CerDIP 44-Pin 40-Pin PDIP Plastic Quad Pin Number Flat Package Normal Pin Number 3-208 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD Symbol Description – C See pin 34. ...
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... COMMON A/Z & DE (±) 30 – INT Figure 3. Analog Section of TC7116/TC7116A and TC7117/TC7117A ANALOG SECTION (All Pin designations refers to 40-Pin Dip) Figure 3 shows the block diagram of the analog section for the TC7116/TC7116A and TC7117/TC7117A. Each measurement cycle is divided into three phases: (1) auto- zero (A-Z), (2) signal integrate (INT), and (3) reference integrate (REF) or deintegrate (DE) ...
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... However, there is only source current, so analog common may easily be tied to a more negative voltage, thus overriding the internal reference. TEST The TEST pin serves two functions. On the TC7117/ TC7117A coupled to the internally-generated digital supply through a 500 CONVERTERS WITH HOLD V + ...
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... BP when OFF, but out-of-phase when ON. In all cases, negligible DC voltage exists across the segments. Figure 9 is the digital section of the TC7117/TC7117A identical to the TC7116/TC7116A, except that the regulated supply and BP drive have been eliminated, and the segment drive is typically 8 mA ...
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... TC7116A TC7117 TC7117A System Timing The clocking method used for the TC7116/TC7116A and TC7117/TC7117A is shown in Figure 9. Three clocking methods may be used: (1) An external oscillator connected to pin 40. (2) A crystal between pins 39 and 40. ( network using all three pins. The oscillator frequency is decade counters ...
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... In the TC7116/TC7116A or the TC7117/ TC7117A, when the analog common is used as a reference, a nominal 2V full- scale integrator swing is acceptable. For the TC7117/TC7117A, with 5V supplies and analog com- mon tied to supply ground ...
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... TC7117 30 0.47 µF TC7117A 0.22 µ DISPLAY Figure 12. TC7117/TC7117A Internal Reference (200 mV Full Scale, – 3 RPS, V Tied to GND for Single-Ended Inputs.) IN 3-214 3-1/2 DIGIT ANALOG-TO-DIGITAL 0.01 µF + – O/R 9V – U/R CD4023 OR 74C10 Figure 13. Circuit for Developing Underrange and Overrange ...
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... Figure curve-tracer display showing the relation- ship between output current and output voltage for typical TC7117CPL/TC7117ACPL devices. Since a typical LED has 1.8V across and its common anode is connected to +5V, the TC7117/TC7117A output is at 3.2V (Point A, Figure 17). Maximum power dissipation is 8.1 mA 3.2V 24 segments = 622 mW. ...
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... TC7116 TC7116A TC7117 TC7117A Figure 17. TC7117/TC7117A Output Current vs Output Voltage 3-216 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD + – TP3 1 k 0.47 µF 100 0.01 pF µF TP5 TP2 0.1 100 47 µF k TP1 TC7117 TC7117A 1 10 DISPLAY 1.5 , 1/4W 1N4001 Figure 18. Diode or Resistor Limits Package Power Dissipation TELCOM SEMICONDUCTOR, INC. – ...