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AD8285CP-EBZ Datasheet(PDF) 23 Page - Analog Devices |
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AD8285CP-EBZ Datasheet(HTML) 23 Page - Analog Devices |
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23 / 27 page  Data Sheet AD8285 Rev. B | Page 23 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 0x0D FLEX_TEST_IO User test mode, 00 = off (default), 01 = on, single alternate, 10 = on, single once, 11 = on, alternate once Reset PN long gen, 1 = on, 0 = off (default) Reset PN short gen, 1 = on, 0 = off (default) Output test mode—see Table 10, 0000 = off (default,) 0001 = midscale short, 0010 = +full-scale short, 0011 = −full-scale short, 0100 = checkerboard output, 0101 = PN sequence long, 0110 = PN sequence short, 0111 = one-/zero-word toggle, 1000 = user input, 1001 = 1-bit/0-bit toggle, 1010 = 1× sync, 1011 = one bit high, 1100 = mixed bit frequency (format determined by the OUTPUT_MODE register) 0x00 When this register is set, the test data is placed on the output pins in place of normal data (local, except for PN sequence). 0x0F FLEX_CHANNEL_INPU T Filter cutoff frequency control, 0000 = 1.3 × 1/4 × fSAMPLECH, 0001 = 1.2 × 1/4 × fSAMPLECH, 0010 = 1.1 × 1/4 × fSAMPLECH, 0011 = 1.0 × 1/4 × fSAMPLECH (default), 0100 = 0.9 × 1/4 × fSAMPLECH, 0101 = 0.8 × 1/4 × fSAMPLECH, 0110 = 0.7 × 1/4 × fSAMPLECH, 0111 = not applicable, 1000 = 1.3 × 1/3 × fSAMPLECH, 1001 = 1.2 × 1/3 × fSAMPLECH, 1010 = 1.1 × 1/3 × fSAMPLECH, 1011 = 1.0 × 1/3 × fSAMPLECH, 1100 = 0.9 × 1/3 × fSAMPLECH, 1101 = 0.8 × 1/3 × fSAMPLECH, 1110 = 0.7 × 1/3 × fSAMPLECH, 1111 = not applicable X X X X 0x30 Low-pass filter cutoff (global). fSAMPLECH = ADC sample rate/ number of active channels. Note that the absolute range is limited to 1.0 MHz to 12.0 MHz. 0x10 FLEX_OFFSET X X 6-bit LNA offset adjustment, 00 0000 for LNA bias high, 01 1111 for LNA mid to high, 10 0000 for LNA mid to low (default), 10 0001 for LNA bias low 0x20 LNA force offset correction (local). 0x11 FLEX_GAIN_1 X X X X X 010 = 16 dB (default), 011 = 22 dB, 100 = 28 dB, 101 = 34 dB 0x02 Total LNA + PGA gain adjustment (local) 0x12 FLEX_BIAS_CURRENT X X X X X X LNA bias, 00 = high, 01 = mid to high (default), 10 = mid to low, 11 = low 0x09 LNA bias current adjustment (global). 0x14 FLEX_OUTPUT_MODE X X X X X 1 = output invert (local) 0 = offset binary (default), 1 = twos complement (global) 0x00 Configures the outputs and the format of the data. 0x15 FLEX_OUTPUT_ ADJUST 0 = enable Data Bits[11:0], 1 = disable Data Bits[11:0] X X X Typical output rise time and fall time, respectively 00 = 2.6 ns, 3.4 ns 01 = 1.1 ns, 1.6 ns 10 = 0.7 ns, 0.9 ns 11 = 0.7 ns, 0.7 ns (default) Typical output drive strength 00 = 45 mA 01 = 30 mA 10 = 60 mA 11 = 60 mA (default) 0x0F Used to adjust output rise and fall times and select output drive strength, limiting the noise added to the channels by output switching. |
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