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LM12434 Datasheet(PDF) 23 Page - National Semiconductor (TI) |
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LM12434 Datasheet(HTML) 23 Page - National Semiconductor (TI) |
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23 / 80 page  50 Pin Descriptions TABLE I LM12 L 438 Pin Description Pin Number Pin Name Description PLCC SO Pkg Pkg 1 7 DGND Digital ground This is the device’s digital supply ground connection It should be connected through a low resistance and low inductance ground return to the system power supply 2 8 IN0 These are the eight analog inputs to the multiplexer For each conversion to be performed the 3 9 IN1 active channels are selected according to the instruction RAM programming Any individual 4 10 IN2 channel can be selected for a single-ended conversion referenced to AGND or any pair of 5 11 IN3 channels whether adjacent or non adjacent can be selected as a fully differential input pairs 6 12 IN4 7 13 IN5 8 14 IN6 9 15 IN7 10 16 VREFa Positive reference input The operating voltage range for this input is 1V s VREFa s VAa (See Figures 3 and 4 ) In order to achieve 12-bit performance this pin should be by passed to AGND at least with a parallel combination of a 10 mF and a 01 mF (ceramic) capacitor The capacitors should be placed as close to the part as possible 11 17 VREFb Negative reference input The operating voltage range for this input is 0 V s VREFb s VREFa b 1V (See Figures 3 and 4 ) In order to achieve 12-bit performance this pin should be bypassed to AGND at least with a parallel combination of a 10 mF and a 01 mF (ceramic) capacitor The capacitors should be placed as close to the part as possible 12 18 AGND Analog ground This is the device’s analog supply ground connection It should be connected through a low resistance and low inductance ground return to the system power supply 13 19 VAa Analog supply This is the supply connection for the analog circuitry The device operating supply voltage range is a30V to a55V Accuracy is guaranteed only if the VAa and VDa are connected to the same potential In order to achieve 12-bit performance this pin should be bypassed to AGND at least with a parallel combination of a 10 mF and a 01 mF (ceramic) capacitor The capacitors should be placed as close to the part as possible 14 20 DGND Digital ground See above definition 15 21 VDa Digital supply This is the supply connection for the analog circuitry The device operating supply 16 22 voltage range is a30V to a55V The device accuracy is guaranteed only if the VAa and VDa are connected to the same potential In order to achieve 12-bit performance this pin should be by passed to DGND at least with a parallel combination of a 10 mF and a 01 mF (ceramic) capacitor The capacitors should be placed as close to the part as possible 17 23 P5 P1 – P5 are the multi-function serial interface input or output pins that have different assignments depending on the selected mode Serial interface input Standard SCLK 8051 TXD I2C SCL TMS320 DR 18 24 P4 Serial interface inputoutput Standard DO 8051 RXD I2C SDA TMS320 DR 19 25 P3 Serial interface input Standard DI 8051 CS I2C SAD2 TMS320 DX 23 |
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