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ADA8282 Datasheet(PDF) 23 Page - Analog Devices |
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ADA8282 Datasheet(HTML) 23 Page - Analog Devices |
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23 / 27 page  Data Sheet AD8283 Rev. C | 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 0D 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 = +FS short 0011 = −FS short 0100 = checkerboard output 0101 = PN sequence long 0110 = PN sequence short 0111 = one-/zero-word toggle 1000 = user input 1001 = 1-/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.) 0F FLEX_CHANNEL_INPUT 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 = N/A 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 = N/A 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 MHz to 12 MHz. 10 FLEX_OFFSET X X 6-bit LNA offset adjustment 00 0000 for LNA bias high 01 1111 for LNA mid-high 10 0000 for LNA mid-low (default) 11 1111 for LNA bias low 0x20 LNA force offset correction (local). 11 FLEX_GAIN_1 X X X X X 010 = 16 dB(default) 011 = 22 dB 100 = 28 dB 101 = 34 dB 0x00 Total LNA + PGA gain adjustment (local) 12 FLEX_BIAS_CURRENT X X X X X X LNA bias 00 = high 01 = mid-high (default) 10 = mid-low 11 = low 0x09 LNA bias current adjustment (global). 14 FLEX_OUTPUT_MODE X X X X X 1 = output invert (local) 0 = offset binary (default) 1 = twos comple- ment (global) 0x00 Configures the outputs and the format of the data. 15 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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