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TC9400COD Datasheet(PDF) 6 Page - Microchip Technology |
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TC9400COD Datasheet(HTML) 6 Page - Microchip Technology |
6 / 20 page TC9400/9401/9402 DS21483B-page 6 © 2002 Microchip Technology Inc. 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. 14-Pin PDIP/CERDIP 14-Pin SOIC (Narrow) Symbol Description 1IBIAS This pin sets bias current in the TC9400. Connect to VSS through a 100kΩ resistor. 2 ZERO ADJ Low frequency adjustment input. 3IIN Input current connection for the V/F converter. 4VSS Negative power supply voltage connection, typically -5V. 5VREF OUT Reference capacitor connection. 6 GND Analog ground. 7VREF Voltage reference input, typically -5V. 8 PULSE FREQ OUT Frequency output. This open drain output will pulse LOW each time the Freq. Threshold Detector limit is reached. The pulse rate is proportional to input voltage. 9OUTPUT COMMON Source connection for the open drain output FETs. 10 FREQ/2 OUT This open drain output is a square wave at one-half the frequency of the pulse output (Pin 8). Output transitions of this pin occur on the rising edge of Pin 8. 11 THRESHOLD DETECTOR Input to the Threshold Detector. This pin is the frequency input during F/V operation. 12 AMPLIFIER OUT Output of the integrator amplifier. 13 NC No internal connection. 14 VDD Positive power supply connection, typically +5V. |
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