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AD8285CP-EBZ датащи(PDF) 25 Page - Analog Devices |
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AD8285CP-EBZ датащи(HTML) 25 Page - Analog Devices |
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25 / 28 page ![]() AD8285 Data Sheet Rev. B | Page 24 of 27 Addr. (Hex) Register Name Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) Default Value Default Notes/ Comments 0x18 FLEX_VREF X 0 = internal reference, 1 = external reference X X X X 00 = 0.625 V, 01 = 0.750 V, 10 = 0.875 V, 11 = 1.024 V (default) 0x03 Select internal reference (recom- mended default) or external reference (global); adjust internal reference. 0x19 FLEX_USER_PATT1_ LSB B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-defined Pattern 1, LSB 0x1A FLEX_USER_PATT1_ MSB B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-defined Pattern 1, MSB 0x1B FLEX_USER_PATT2_ LSB B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-defined Pattern 2, LSB 0x1C FLEX_USER_PATT2_ MSB B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-defined Pattern 2, MSB 0x2B FLEX_FILTER X Enable automatic low-pass tuning, 1 = on (self- clearing) X X X X X X 0x00 Refer to the Antialiasing Filter (AAF) section. 0x2C CH_IN_IMP X X X X X X X 0 = 200 Ω (default), 1 = 200 kΩ 0x00 Input impedance adjustment (global). Table 10. Flexible Output Test Modes Output Test Mode Bit Sequence Pattern Name Digital Output Word 1 Digital Output Word 2 Subject to Data Format Select 0000 Off (default) Not applicable Not applicable Not applicable 0001 Midscale short 1000 0000 0000 Same Yes 0010 +Full-scale short 1111 1111 1111 Same Yes 0011 −Full-scale short 0000 0000 0000 Same Yes 0100 Checkerboard output 1010 1010 1010 0101 0101 0101 No 0101 PN sequence long Not applicable Not applicable Yes 0110 PN sequence short Not applicable Not applicable Yes 0111 One-/zero-word toggle 1111 1111 1111 0000 0000 0000 No 1000 User input Register 0x19 to Register 0x1A Register 0x1B to Register 0x1C No 1001 1-bit/0-bit toggle 1010 1010 1010 Not applicable No 1010 1× sync 0000 0011 1111 Not applicable No 1011 One bit high 1000 0000 0000 Not applicable No 1100 Mixed bit frequency 1010 0011 0011 Not applicable No |
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