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ADS8484 Datasheet(PDF) 8 Page - Texas Instruments |
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ADS8484 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 33 page www.ti.com PIN ASSIGNMENTS +VBD BUS18/16 BYTE CONVST RD CS +VA AGND AGND +VA REFM REFM RGZ PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 48 47 46 45 44 43 42 41 40 39 38 37 13 14 15 16 17 18 19 20 21 22 23 24 +VBD DB10 DB11 DB12 DB13 DB14 DB15 DB16 DB17 AGND AGND +VA NC − No internal connection NOTE: The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance. ADS8484 SLAS511 – NOVEMBER 2007 TERMINAL FUNCTIONS NAME NO I/O DESCRIPTION 8, 9, 17, 20, AGND 23, 24, 26, – Analog ground 27 BDGND 37 – Digital ground for bus interface digital supply BUSY 48 O Status output. High when a conversion is in progress. Bus size select input. Used for selecting 18-bit or 16-bit wide bus transfer. 0: Data bits output on the 18-bit data bus pins DB[17:0]. BUS18/16 2 I 1: Last two data bits D[1:0] from 18-bit wide bus output on: a) the low byte pins DB[9:2] if BYTE = 0 b) the high byte pins DB[17:10] if BYTE = 1 Byte select input. Used for 8-bit bus reading. BYTE 3 I 0: No fold back 1: Low byte D[9:2] of the 16 most significant bits is folded back to high byte of the 16 most significant pins DB[17:10]. CONVST 4 I Convert start. The falling edge of this input ends the acquisition period and starts the hold period. CS 6 I Chip select. The falling edge of this input starts the acquisition period. 8-BIT BUS 16-BIT BUS 18-BIT BUS Data Bus BYTE = 0 BYTE = 1 BYTE = 1 BYTE = 0 BYTE = 0 BYTE = 0 BUS18/16 = 0 BUS18/16 = 0 BUS18/16 = 1 BUS18/16 = 0 BUS18/16 = 1 BUS18/16 = 0 DB17 28 O D17 (MSB) D9 All ones D17 (MSB) All ones D17 (MSB) DB16 29 O D16 D8 All ones D16 All ones D16 DB15 30 O D15 D7 All ones D15 All ones D15 DB14 31 O D14 D6 All ones D14 All ones D14 DB13 32 O D13 D5 All ones D13 All ones D13 DB12 33 O D12 D4 All ones D12 All ones D12 DB11 34 O D11 D3 D1 D11 All ones D11 DB10 35 O D10 D2 D0 (LSB) D10 All ones D10 8 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): ADS8484 |
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