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ADS8504IB bảng dữ liệu(PDF) 9 Page - Burr-Brown (TI) |
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ADS8504IB bảng dữ liệu(HTML) 9 Page - Burr-Brown (TI) |
9 / 19 page www.ti.com 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 ADS8504 +5V + + + + Convert Pulse 40 ns Min 200 Ω 2.2 µF 0.1 µF 10 µF 33.2 k Ω D11 (MSB) D10 D9 D8 D7 D6 D5 D4 DZ Low DZ Low DZ Low DZ Low D0 (LSB) D1 D2 D3 2.2 µF BUSY R/C READING DATA ADS8504 SLAS434 – JUNE 2005 BASIC OPERATION (continued) CS and R/C are internally ORed 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 10 ns prior to the initiating input. To reduce the number of control pins, CS can be tied low using R/C to control the read and convert modes. The parallel output becomes active whenever R/C goes high. Refer to the READING DATA section. Table 1. Control Line Functions for Read and Convert CS R/C BUSY OPERATION 1 X X None. Databus is in Hi-Z state. ↓ 0 1 Initiates conversion n. Databus remains in Hi-Z state. 0 ↓ 1 Initiates conversion n. Databus enters Hi-Z state. 0 1 ↑ Conversion n completed. Valid data from conversion n on the databus. ↓ 1 1 Enables databus with valid data from conversion n. ↓ 1 0 Enables databus with valid data from conversion n-1(1). Conversion n in progress. 0 ↑ 0 Enables databus with valid data from conversion n-1(1). Conversion n in progress. 0 0 ↑ New conversion initiated without acquisition of a new signal. Data is invalid. CS and/or R/C must be high when BUSY goes high. X X 0 New convert commands ignored. Conversion n in progress. (1) See Figure 19 and Figure 20 for constraints on data valid from conversion n-1. Figure 17. Basic Operation The ADS8504 outputs full or byte-reading parallel data in binary 2's complement data output format. The parallel output is active when R/C (pin 24) is high and CS (pin 25) is low. Any other combination of CS and R/C 3-states the parallel output. Valid conversion data can be read in a full parallel, 12-bit word or two 8-bit bytes on pins 6-13 and pins 15-22. BYTE (pin 23) can be toggled to read both bytes within one conversion cycle. Refer to Table 2 for ideal output codes and Figure 18 for bit locations relative to the state of BYTE. 9 |
Số phần tương tự - ADS8504IB |
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Mô tả tương tự - ADS8504IB |
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