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TC7126CPL Datasheet(PDF) 4 Page - TelCom Semiconductor, Inc |
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TC7126CPL Datasheet(HTML) 4 Page - TelCom Semiconductor, Inc |
4 / 13 page 3-220 TELCOM SEMICONDUCTOR, INC. 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A PIN DESCRIPTION 40-Pin PDIP Pin Number Normal (Reverse) Name Description 1 (40) V+ Positive supply voltage. 2 (39) D1 Activates the D section of the units display. 3 (38) C1 Activates the C section of the units display. 4 (37) B1 Activates the B section of the units display. 5 (36) A1 Activates the A section of the units display. 6 (35) F1 Activates the F section of the units display. 7 (34) G1 Activates the G section of the units display. 8 (33) E1 Activates the E section of the units display. 9 (32) D2 Activates the D section of the tens display. 10 (31) C2 Activates the C section of the tens display. 11 (30) B2 Activates the B section of the tens display. 12 (29) A2 Activates the A section of the tens display. 13 (28) F2 Activates the F section of the tens display. 14 (27) E2 Activates the E section of the tens display. 15 (26) D3 Activates the D section of the hundreds display. 16 (25) B3 Activates the B section of the hundreds display. 17 (24) F3 Activates the F section of the hundreds display. 18 (23) E3 Activates the E section of the hundreds display. 19 (22) AB4 Activates both halves of the 1 in the thousands display. 20 (21) POL Activates the negative polarity display. 21 (20) BP Backplane drive output. 22 (19) G3 Activates the G section of the hundreds display. 23 (18) A3 Activates the A section of the hundreds display. 24 (17) C3 Activates the C section of the hundreds display. 25 (16) G2 Activates the G section of the tens display. 26 (15) V– Negative power supply voltage. 27 (14) VINT The integrating capacitor should be selected to give the maximum voltage swing that ensures component tolerance build-up will not allow the integrator output to saturate. When analog common is used as a reference and the conversion rate is 3 readings per second, a 0.047 µF capacitor may be used. The capacitor must have a low dielectric constant to prevent roll-over errors. See "Integrating Capaci- tor" section for additional details. 28 (13) VBUFF Integration resistor connection. Use a 180 k Ω resistor for a 200 mV full-scale range and a 1.8 M Ω resistor for a 2V full-scale range. 29 (12) CAZ The size of the auto-zero capacitor influences system noise. Use a 0.33 µF capacitor for 200 mV full scale, and a 0.033 µF capacitor for 2V full scale. See paragraph on auto-zero capacitor for more details. 30 (11) VIN– The low input signal is connected to this pin. 31 (10) VIN+ The high input signal is connected to this pin. 32 (9) ANALOG This pin is primarily used to set the analog common-mode voltage for battery operation or in systems where the input signal is referenced to the power supply. See paragraph on analog common for more details. It also acts as a reference voltage source. 33 (8) CREF – See pin 34. COMMON |
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