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ADS8557I Arkusz danych(PDF) 11 Page - Texas Instruments |
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ADS8557I Arkusz danych(HTML) 11 Page - Texas Instruments |
11 / 40 page ADS8556 ADS8557 ADS8558 www.ti.com ............................................................................................................................................... SBAS404A – OCTOBER 2006 – REVISED AUGUST 2009 TERMINAL FUNCTIONS DESCRIPTION NAME PIN # TYPE(1) PARALLEL INTERFACE (PAR/SER = 0) SERIAL INTERFACE (PAR/SER = 1) Hardware mode (HW/SW = 0): Reference buffers enable input. When low, all reference buffers are enabled (mandatory if internal reference is used). When high, all reference buffers Data bit 14 input/output DB14/REFBUFEN 1 DIO/DI are disabled. Output is '0' for the ADS8557/8 Software mode (HW/SW = 1):Connect to BGND or BVDD. The reference buffers are controlled by bit C24 (REFBUF) in control register (CR). Data bit 13 input/output Hardware mode (HW/SW = 0): Connect to BGND DB13/SDI 2 DIO/DI Output is MSB for the ADS8557 and '0' for the Software mode (HW/SW = 1): Serial data input ADS8558 Data bit 12 input/output DB12 3 DIO Connect to BGND Output is '0' for the ADS8558 Data bit 11 input/output DB11 4 DIO Connect to BGND Output is MSB for the ADS8558 When SEL_C = 1, data output for channel C DB10/SDO_C 5 DIO/DO Data bit 10 input/output When SEL_C = 0, this pin should be tied to BGND When SEL_B = 1, data output for channel B When SEL_B = 0, this pin should be tied to BGND DB9/SDO_B 6 DIO/DO Data bit 9 input/output When SEL_C = 0, data from channel C1 are also available on this output Data output for channel A When SEL_C = 0, data from channel C0 are also available DB8/SDO_A 7 DIO/DO Data bit 8 input/output on this output When SEL_C = 0 and SEL_B = 0, SDO_A acts as the single data output for all channels BGND 8 P Buffer IO ground, connect to digital ground plane Buffer IO supply, connect to digital supply (2.7V to 5.5V). Decouple with a 1 µF ceramic capacitor or a combination BVDD 9 P of 100nF and 10 µF ceramic capacitors to BGND. Word mode (WORD/BYTE = 0): Data bit 7 input/output Daisy-chain enable input. Byte mode (WORD/BYTE = 1): DB7/HBEN/DCEN 10 DIO/DI/DI When high, DB[5:3] serve as daisy-chain inputs DCIN[A:C]. High byte enable input. If daisy-chain mode is not used, connect to BGND. When high, the high byte is output first on DB[15:8]. When low, the low byte is output first on DB[15:8]. Word mode (WORD/BYTE = 0): Data bit 6 input/output DB6/SCLK 11 DIO/DI Serial interface clock input (36MHz max) Byte mode (WORD/BYTE = 1): Connect to BGND or BVDD Word mode (WORD/BYTE = 0): Data bit 5 input/output When DCEN = 1, daisy-chain data input for channel A DB5/DCIN_A 12 DIO/DI When DCEN = 0, connect to BGND Byte mode (WORD/BYTE = 1): Connect to BGND or BVDD Word mode (WORD/BYTE = 0): When SEL_B = 1 and DCEN = 1, daisy-chain data input for Data bit 4 input/output DB4/DCIN_B 13 DIO/DI channel B Byte mode (WORD/BYTE = 1): When DCEN = 0, connect to BGND Connect to BGND or BVDD Word mode (WORD/BYTE = 0): When SEL_C = 1 and DCEN = 1, daisy-chain data input for Data bit 3 input/output DB3/DCIN_C 14 DIO/DI channel C Byte mode (WORD/BYTE = 1): When DCEN = 0, connect to BGND Connect to BGND or BVDD Word mode (WORD/BYTE = 0): Data bit 2 input/output Select SDO_C input. DB2/SEL_C 15 DIO/DI When high, SDO_C is active. When low, SDO_C is disabled. Byte mode (WORD/BYTE = 1): Connect to BGND or BVDD Word mode (WORD/BYTE = 0): Data bit 1 input/output Select SDO_B input. DB1/SEL_B 16 DIO/DI When high, SDO_B is active. When low, SDO_B is disabled. Byte mode (WORD/BYTE = 1): Connect to BGND or BVDD (1) AI = analog input; AIO = analog input/output; DI = digital input; DO = digital output; DIO = digital input/output; and P = power supply. Copyright © 2006–2009, Texas Instruments Incorporated 11 Product Folder Link(s): ADS8556 ADS8557 ADS8558 |
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