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AD8284 Datasheet(PDF) 22 Page - Analog Devices |
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AD8284 Datasheet(HTML) 22 Page - Analog Devices |
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22 / 28 page  AD8284 Data Sheet Rev. D | Page 22 of 28 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 0x0E TEST_REGISTER Enable analog outputs (APOUT, ANOUT) 0x01 = analog output enabled 0x00 Routes the differential output of the AAF to APOUT and ANOUT. 0x0F FLEX_CHANNEL_INPUT Filter cutoff frequency control 00000 = 1.25 × 1/4 × fSAMPLECH 00001 = 1.1875 × 1/4 × fSAMPLECH 00010 = 1.125 × 1/4 × fSAMPLECH 00011 = 1.0625 × 1/4 × fSAMPLECH 00100 = 1.0 × 1/4 × fSAMPLECH 00101 = 0.9375 × 1/4 × fSAMPLECH 00110 = 0.875 × 1/4 × fSAMPLECH 00111 = 0.8125 × 1/4 × fSAMPLECH 01000 = 0.75 × 1/4 × fSAMPLECH 01001 to 01111 = reserved 10000 = 1.25 × 1/3 × fSAMPLECH 10001 = 1.1875 × 1/3 × fSAMPLECH 10010 = 1.125 × 1/3 × fSAMPLECH (default) 10011 = 1.0625 × 1/3 × fSAMPLECH 10100 = 1.0 × 1/3 × fSAMPLECH 10101 = 0.9375 × 1/3 × fSAMPLECH 10110 = 0.875 × 1/3 × fSAMPLECH 10111 = 0.8125 × 1/3 × fSAMPLECH 11000 = 0.75 × 1/3 × fSAMPLECH 11001 to 11111 = reserved X X X 0x90 Low-pass filter cutoff (global). fSAMPLECH = ADC sample rate. Note that the absolute range is limited to 9 MHz to 15 MHz. 0x10 FLEX_OFFSET X X 6-bit LNA offset adjustment 00 0000 for LNA offset low 10 0000 for LNA offset mid (default) 11 1111 for LNA offset high 0x20 LNA force offset correction. 0x11 FLEX_GAIN_1 X X X X X 000 = 17 dB 001 = 17 dB 010 = 17 dB 011 = 23 dB 100 = 29 dB (default) 101 = 35 dB 0x04 Total LNA + PGA gain adjustment (local). 0x12 FLEX_BIAS_CURRENT X X X X X X LNA bias 00 = high (default) 01 = mid to high 10 = mid to low 11 = low 0x00 LNA bias current adjustment (global). 0x14 FLEX_OUTPUT_MODE X X X X X 1 = output invert (local) 0 = offset binary 1 = twos comple- ment (default) 0x01 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 Output drive current 0000 = low … 1111 = high (default) 0x0F Selects output drive strength to limit the noise added to the channels by output switching. 0x18 FLEX_VREF X 0 = internal reference (default) 1 = external reference X X X X Internal reference adjust 00 = 0.625 V 01 = 0.750 V 10 = 0.875 V 11 = 1.000 V (default) 0x03 Select internal reference (recommended default) or exter- nal reference (global); adjust internal refer- ence. 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. |
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