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ADS8342IPFBTG4 Datasheet(PDF) 9 Page - Texas Instruments |
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ADS8342IPFBTG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page ADS8342 SBAS277 – MAY 2003 www.ti.com 9 Terminal Functions TERMINAL TYPE(1) NAME NO. DESCRIPTION Analog Input Signals AIN0 45 AI Analog input 0 AIN1 46 AI Analog input 1 AIN2 47 AI Analog input 2 AIN3 48 AI Analog input 3 COMMON 44 AI Analog input common signal REFIN 41 AI Reference voltage input pin for external reference voltage. Decouple to reference ground with a 0.1 µF ceramic capacitor. REFGND 42 AI Reference ground. Connected to the ground of the external reference voltage. Digital Interface Signals A(x) 5, 6 DI Address decode input, select analog input. DB(x) 16–23, 26–33 DO Output 3-state data bus. DB15 (MSB) to DB0 (LSB). Data lines are 3-state during conversion. RD should be asserted only when the part is not converting. CS 10 DI Active low chip select signal RD 9 DI Active low read signal CLK 11 DI System clock CLKDIV(x) 3, 4 DI Select clock divider ratio. Internally divides external clock (pin 11) by 1, 2, 4, or 8. CONV 8 DI Convert start. When CONV switches from high to low, the device switches from sample mode to hold mode, independent of the external clock status. The address for the next conversion will be latched on low-to-high transition. BUSY 15 DO BUSY goes high during a conversion and returns low at the end when data is available for reading. BYTE 7 DI Active high bus width is 8 bits. When BYTE is low, the bus width is 16 bits. Power Supply +AVDD 39 P Positive analog power supply, +5VDC. Decouple to analog ground with a 0.1µF ceramic capacitor and a 4.7 µF tantalum capacitor. Referenced to the same power supply as +DVDD (pin 12). –AVDD 37 P Negative analog power supply –5VDC. Decouple to analog ground with a 0.1µF ceramic capacitor and a 4.7 µF tantalum capacitor. Referenced to the same power supply as –DVDD (pin 14). BVDD 24 P Digital I/O power supply in the range 2.7V to DVDD. Decouple to digital I/O ground with a 0.1µF ceramic capacitor and a 4.7 µF tantalum capacitor. +DVDD 12 P Positive digital power supply +5VDC. Decouple to digital ground with a 0.1µF ceramic capacitor and a 4.7 µF tantalum capacitor. Referenced to the same power supply as +AVDD (pin 39). –DVDD 14 P Negative digital power supply –5VDC. Decouple to digital ground with a 0.1µF ceramic capacitor and a 4.7 µF tantalum capacitor. Referenced to the same power supply as –AVDD (pin 37). AGND 36, 38 P Analog ground. Connected directly to digital ground (pin 13) and digital I/O ground (pin 25). BGND 25 P Digital I/O ground. Connected directly to analog ground (pins 36 and 38) and digital ground (pin 13). DGND 13 P Digital ground. Connected directly to analog ground (pins 36 and 38) and digital I/O ground (pin 25). (1) AI is analog input, AO is analog output, DI is digital input, DO is digital output, and P is power-supply connection. |
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