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数据搜索系统，热门电子元器件搜索 |
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SM5846AP 数据表(PDF) 21 Page - Nippon Precision Circuits Inc |
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SM5846AP 数据表(HTML) 21 Page - Nippon Precision Circuits Inc |
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21 / 36 page  SM5846AP NIPPON PRECISION CIRCUITS—21 "0" a1 a2 a3 a4 a5 a6 a7 bit1 bit2 bit3 bit4 bit5 bit6 bit7 bit8 MSB LSB Register information DATT attenation data (7bit) Attenuation setting The data stored in the D-ATT attenuation register, accessed through the microprocessor interface, determines the attenuation setting of the digital attenuator. The D-ATT register data format is shown below. The attenuation setting is given by the following equations. The attenuation for a selection of values is given in the following table. DATT register value Microprocess or command (hex) Attenuation (dB) Relative gain 0 00H 0 × 1.0 1 01H −0.137 × 0.984375 2 02H −0.206 × 0.9765625 ↓↓↓↓ 63 3FH −6.021 × 0.5 64 40H −6.157 × 0.4921875 ↓↓↓↓ 125 7DH −36.12 × 0.015625 126 7EH −42.14 × 0.0078125 127 7FH −∞ × 0 Attenuation 0 [dB] = Attenuation 20log 10 127 DATT – 128 ------------------------------- [dB] = Attenuation ∞ – = DATT = 0 () 0 < DATT <127 () DATT = 127 () Digital attenuator operation The attenuation register is reset to 0 (attenuation = 0 dB) after a system reset signal. When data is written to the attenuation register, through the microprocessor interface, the attenuation changes from the current value to the new value at the speed shown in the following table. Soft muting operation Soft muting ON/OFF is controlled by the MUTE flag, accessed through the microprocessor interface. When muting is ON, the attenuation ramps down to −∞ at the speed shown in the table. Similarly when muting is OFF, the attenuation level returns to the original value at the same speed. If the contents of the DATT attenuation register are changed while muting is ON (attenuation = −∞), only the register contents are replaced. If muting is subsequently turned OFF, the attenuation value changes to the new value at the same speed as shown in the table. Operating speed Speed of attenuation change Time from min. to max. attenuation Normal-speed sampling 8/fs per step change 1016/fs (23.0 ms at 44.1 kHz) High-speed sampling 16/fs per step change 2032/fs (23.0 ms at 88.2 kHz) MUTE Muting Notes HIGH OFF The MUTE flag is set HIGH (default) after a system reset. LOW ON |
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