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ADS8422IBPFBT Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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ADS8422IBPFBT Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 25 page www.ti.com PIN ASSIGNMENTS 23 BUSY BDGND +VBD DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 BDGND 13 14 1 2 3 4 5 6 7 8 9 10 11 12 REFIN REFOUT COMMOUT +VA AGND +IN −IN AGND CAP1 +VAREG NC AGND 15 16 17 18 47 46 45 44 43 48 42 40 39 38 41 19 20 21 22 36 35 34 33 32 31 30 29 28 27 26 25 24 37 ADS8422 SLAS512B – JUNE 2006 – REVISED DECEMBER 2006 PFB Package (Top View) A. NC - No connection B. Pins 9 and 13 are internally regulated 3-V outputs and are externally to be connected to decoupling capacitors only. C. +VAREG can be connected to a 3-V to 5-V supply. D. Pin 3 outputs REFIN/2 E. Pin 38 can be used for ADC powerdown and pin 37 for analog output powerdown. TERMINAL FUNCTIONS NAME NO I/O DESCRIPTION 5, 8, 12, 14, AGND – Analog ground 15, 44, 45 BDGND 25, 35 – Digital ground for bus interface digital supply BUSY 36 O Status output. High when a conversion is in progress. Byte select input. Used for 8-bit bus reading. BYTE 39 I 0: No fold back 1: Low byte D[7:0] of the 16 most significant bits is folded back to high byte of the 16 most significant pins DB[15:8]. This pin outputs REFIN/2 and can be used to set the common-mode voltage of the differential analog input, (+IN + COMMOUT 3 O –IN)/2. CONVST 40 I Convert start. This input is low true and can act independent of the CS input. CS 42 I Chip select. CAP1, CAP2 9, 13 O Decoupling of internally generated 3-V supply. Add 1- µF capacitor from these pins to AGND. 8-BIT BUS 16-BIT BUS Data Bus BYTE = 0 BYTE = 1 BYTE = 0 DB15 16 O D15 (MSB) D7 D15 (MSB) DB14 17 O D14 D6 D14 DB13 18 O D13 D5 D13 DB12 19 O D12 D4 D12 DB11 20 O D11 D3 D11 DB10 21 O D10 D2 D10 7 Submit Documentation Feedback |
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