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ADS7825PB Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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ADS7825PB Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 16 page 8 ® ADS7825 STARTING A CONVERSION The combination of CS (pin 23) and R/C (pin 22) LOW for a minimum of 40ns places the sample/hold of the ADS7825 in the hold state and starts conversion ‘n’. BUSY (pin 24) will go LOW and stay LOW until conversion ‘n’ is com- pleted and the internal output register has been updated. All new convert commands during BUSY LOW will be ignored. CS and/or R/C must go HIGH before BUSY goes HIGH or a new conversion will be initiated without sufficient time to acquire a new signal. The ADS7825 will begin tracking the input signal at the end of the conversion. Allowing 25 µs between convert com- mands assures accurate acquisition of a new signal. Refer to Tables Ia and Ib for a summary of CS, R/C, and BUSY states and Figures 2 through 6 and Table II for timing information. CS and R/C are internally OR’d and level triggered. There is not a requirement which input goes LOW first when initiating a conversion. If, however, it is critical that CS or R/C initiates conversion ‘n’, be sure the less critical input is LOW at least 10ns prior to the initiating input. If EXT/INT (pin 12) is LOW when initiating conversion ‘n’, serial data from conversion ‘n – 1’ will be output on SDATA (pin 16) following the start of conversion ‘n’. See Internal Data Clock in the Reading Data section. To reduce the number of control pins, CS can be tied LOW using R/C to control the read and convert modes. This will have no effect when using the internal data clock in the serial output mode. However, the parallel output and the serial output (only when using an external data clock) will be affected whenever R/C goes HIGH. Refer to the Reading Data section and Figures 2, 3, 5, and 6. TABLE Ia. Read Control for Parallel Data (PAR/SER = 5V.) INPUTS OUTPUTS CS R/C BYTE CONTC PWRD BUSY D7 D6 D5 D4 D3 D2 D1 D0 COMMENTS 1 X X X X X Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z X 0 X X X X Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z 0 1 0 X X X D15 D14 D13 D12 D11 D10 D9 D8 Results from last (MSB) completed conversion. 0 1 1 X X X D7 D6 D5 D4 D3 D2 D1 D0 Results from last (LSB) completed conversion. 01 XX X ↑ ↑↓ ↑↓ ↑↓↑↓↑↓ ↑↓↑↓↑↓ Data will change at the end of a conversion. D4 D3 D2 D1 D0 CS R/C CONTC PWRD BUSY D7, D6, D5 EXT/INT SYNC DATACLK SDATA TAG Input Input Input Input Output Output Input Output I/O Output Input COMMENTS 1 X X X 1 Hi-Z LOW LOW Output Hi-Z X X 0 X X 1 Hi-Z LOW LOW Output Hi-Z X 0 ↓ 0 X 1 HI-Z LOW LOW Output Output X Starts transmission of data from previous conversion on SDATA synchronized to 16 pulses output on DATACLK. ↓ 0 0 X 1 Hi-Z LOW LOW Output Output X Starts transmission of data from previous conversion on SDATA synchronized to 16 pulses output on DATACLK. 0 1 0 X X Hi-Z HIGH LOW Input Output Input The level output on SDATA will be the level input on TAG 16 DATACLK input cycles. 0 10X ↑ Hi-Z HIGH LOW Input Output Input At the end of the conversion, when BUSY rises, data from the conversion will be shifted into the output registers. If DATACLK is HIGH, valid data will be lost. 0 ↑ 0 X 1 Hi-Z HIGH LOW Input Output X Initiates transmission of a HIGH pulse on SYNC followed by data from last completed conversion on SDATA synchronized to the input on DATACLK. ↓ 1 0 X 1 Hi-Z HIGH LOW Input Output X Initiates transmission of a HIGH pulse on SYNC followed by data from last completed conversion on SDATA synchronized to the input on DATACLK. 00 1 0 ↓ Hi-Z LOW LOW Output Output X Starts transmission of data from previous conversion on SDATA synchronized to 16 pulses output on DATACLK ↓ 1 X X X Hi-Z HIGH Output Input Output X SDATA becomes active. Inputs on DATACLK shift out data. 0 ↑ X X X Hi-Z HIGH Output Input Output X SDATA becomes active. Inputs on DATACLK shift out data. ↓ 0 1 X X Hi-Z LOW LOW Output Output X Restarts continuous conversion mode (n – 1 data transmitted when BUSY is LOW). 0 ↓ 1 X X Hi-Z LOW LOW Output Output X Restarts continuous conversion mode (n – 1 data transmitted when BUSY is LOW). TABLE Ib. Read Control for Serial Data (PAR/SER = 0V.) |
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