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ADA4254ACPZ-R7 数据表(PDF) 30 Page - Analog Devices |
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ADA4254ACPZ-R7 数据表(HTML) 30 Page - Analog Devices |
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30 / 59 page  ADA4254 Data Sheet Rev. B | Page 30 of 59 GAIN ERROR CALIBRATION The ADA4254 includes measured gain errors for all 32 gain combinations, readable from the on-chip ROM. These errors are measured at 25°C and are stored in Register 0x10 through Register 0x27 at the time of production. Using this technology improves gain accuracy by a factor of 5, improving system accuracy and reducing additional calibration requirements. Each register contains 5 bits. The most significant bit (MSB) represents the polarity of the error, with a setting of 1 indicating a negative polarity and a setting of 0 indicating a positive polarity. The remaining 4 bits contain the magnitude based on a least significant bit (LSB) of 100 ppm for GAIN_CAL1 through GAIN_CAL12 and 50 ppm for GAIN_CAL13 through GAIN_CAL24. GAIN_CAL1 through GAIN_CAL12 directly provide the measured gain errors of all 12 gain values with the scaling gain set to 1 V/V. GAIN_CAL13 through GAIN_CAL24 provide additional gain error incurred when using other scalar gains. This is tabulated in Table 7. Table 7. Gain Calibration Register Contents1 Register Name G[3:0] G4 G5 Contents 0x10 GAIN_CAL1 0b0000 0 0 Gain error for G = 1/16 V/V × 1 V/V 0x11 GAIN_CAL2 0b0001 0 0 Gain error for G = 1/8 V/V × 1 V/V 0x12 GAIN_CAL3 0b0010 0 0 Gain error for G = 1/4 V/V × 1 V/V 0x13 GAIN_CAL4 0b0011 0 0 Gain error for G = 1/2 V/V × 1 V/V 0x14 GAIN_CAL5 0b0100 0 0 Gain error for G = 1 V/V × 1 V/V 0x15 GAIN_CAL6 0b0101 0 0 Gain error for G = 2 V/V × 1 V/V 0x16 GAIN_CAL7 0b0110 0 0 Gain error for G = 4 V/V × 1 V/V 0x17 GAIN_CAL8 0b0111 0 0 Gain error for G = 8 V/V × 1 V/V 0x18 GAIN_CAL9 0b1000 0 0 Gain error for G = 16 V/V × 1 V/V 0x19 GAIN_CAL10 0b1001 0 0 Gain error for G = 32 V/V × 1 V/V 0x1A GAIN_CAL11 0b1010 0 0 Gain error for G = 64 V/V × 1 V/V 0x1B GAIN_CAL12 0b1011 0 0 Gain error for G = 128 V/V × 1 V/V 0x1C GAIN_CAL13 0b000x 1 X Additional gain error for G = 1/16 V/V × 1.375 V/V or G = 1/8 V/V × 1.375 V/V 0x1D GAIN_CAL14 0b001x 1 X Additional gain error for G = 1/4 V/V × 1.375 V/V or G = 1/2 V/V × 1.375 V/V 0x1E GAIN_CAL15 0b010x 1 X Additional gain error for G = 1 V/V × 1.375 V/V or G = 2 V/V × 1.375 V/V 0x1F GAIN_CAL16 0b011x 1 X Additional gain error for G = 4 V/V × 1.375 V/V or G = 8 V/V × 1.375 V/V 0x20 GAIN_CAL17 0b100x 1 X Additional gain error for G = 16 V/V × 1.375 V/V or G = 32 V/V × 1.375 V/V 0x21 GAIN_CAL18 0b101x 1 X Additional gain error for G = 64 V/V × 1.375 V/V or G = 128 V/V × 1.375 V/V 0x22 GAIN_CAL19 0b000x 0 1 Additional gain error for G = 1/16 V/V × 1.25 V/V or G = 1/8 V/V × 1.25 V/V 0x23 GAIN_CAL20 0b001x 0 1 Additional gain error for G = 1/4 V/V × 1.25 V/V or G = 1/2 V/V × 1.25 V/V 0x24 GAIN_CAL21 0b010x 0 1 Additional gain error for G = 1 V/V × 1.25 V/V or G = 2 V/V × 1.25 V/V 0x25 GAIN_CAL22 0b011x 0 1 Additional gain error for G = 4 V/V × 1.25 V/V or G = 8 V/V × 1.25 V/V 0x26 GAIN_CAL23 0b100x 0 1 Additional gain error for G = 16 V/V × 1.25 V/V or G = 32 V/V × 1.25 V/V 0x27 GAIN_CAL24 0b101x 0 1 Additional gain error for G = 64 V/V × 1.25 V/V or G = 128 V/V × 1.25 V/V 1 X means don’t care. |
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