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TC7116CPL 데이터시트(PDF) 10 Page - TelCom Semiconductor, Inc |
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TC7116CPL 데이터시트(HTML) 10 Page - TelCom Semiconductor, Inc |
10 / 14 page 3-212 TELCOM SEMICONDUCTOR, INC. 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD TC7116 TC7116A TC7117 TC7117A TC7117 TC7117A THOUSANDS HUNDREDS TENS UNITS 4 39 OSC V DIGITAL GND TEST 35 TO SWITCH DRIVERS FROM COMPARATOR OUTPUT CLOCK 7-SEGMENT DECODE 7-SEGMENT DECODE 7-SEGMENT DECODE 40 38 2 OSC3 OSC1 ÷ HLDR CONTROL LOGIC TYPICAL SEGMENT OUTPUT DIGITAL GROUND TO SEGMENT V + 0.5 mA 8 mA 37 21 500 Ω V + 1 LATCH ~70 k Ω + 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. (3) An RC network using all three pins. The oscillator frequency is 4 before it clocks the decade counters. It is then further divided to form the three convert-cycle phases: signal integrate (1000 counts), refer- ence deintegrate (0 to 2000 counts), and auto-zero (1000 to 3000 counts). For signals less than full scale, auto-zero gets the unused portion of reference deintegrate. This makes a complete measure cycle of 4000 (16,000 clock pulses) independent of input voltage. For 3 readings per second, an oscillator frequency of 48 kHz would be used. To achieve maximum rejection of 60-Hz pickup, the signal-integrate cycle should be a multiple of 60 Hz. Oscil- lator frequencies of 240 kHz, 120 kHz, 80 kHz, 60 kHz, 48 kHz, 40 kHz, etc. should be selected. For 50 Hz rejection, oscillator frequencies of 200 kHz, 100 kHz, 66-2/3 kHz, 50 kHz, 40 kHz, etc. would be suitable. Note that 40 kHz (2.5 readings per second) will reject both 50 Hz and 60 Hz. HOLD Reading Input When HLDR is at a logic HIGH the latch will not be updated. Analog-to-digital conversions will continue but will not be updated until HLDR is returned to LOW. To continu- ously update the display, connect to test (TC7116/TC7116A) or ground (TC7117/TC7117A), or disconnect. This input is CMOS compatible with 70 k Ω typical resistance to TEST (TC7116/TC7116A) or ground (TC7117/TC7117A). Figure 9. TC7117/TC7117A Digital Section |
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