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AD9480 数据表(PDF) 21 Page - Analog Devices |
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AD9480 数据表(HTML) 21 Page - Analog Devices |
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21 / 29 page  AD9480 Rev. A | Page 20 of 28 VOLTAGE REFERENCE The AD9480 has an internal 1 V reference mode. The ADC uses the internal 1 V reference as the default when SENSE is set to ground. An optional on-board external 1.0 V reference (ADR510) can be used by setting the SENSE jumper to AVDD, by placing a jumper on E20 to E3, and by placing a 0 Ω resistor on R36. When using an external programmable reference (R20, R30), the SENSE jumper must be removed. DATA OUTPUTS The off-chip drivers provide LVDS-compatible output levels with an LVDS RSET resistor of 3.74 kΩ. The ADC digital outputs can be terminated on the board by 100 Ω resistors at the connector if receiving logic does not have the required termination resistance. (The on-chip LVDS output drivers require a far-end, 100 Ω differential termination.) |
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