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ADC1413D датащи(PDF) 16 Page - NXP Semiconductors |
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ADC1413D датащи(HTML) 16 Page - NXP Semiconductors |
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16 / 43 page ![]() ADC1413D_SER All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 5 — 9 February 2011 16 of 43 NXP Semiconductors ADC1413D series Dual 14-bit ADC; serial JESD204A interface The configuration shown in Figure 9 is recommended for high frequency applications. In both cases, the choice of transformer is a compromise between cost and performance. 11.2 System reference and power management 11.2.1 Internal/external reference The ADC1413D has a stable and accurate built-in internal reference voltage to adjust the ADC full-scale. This reference voltage can be set internally via SPI or with pins VREF and SENSE (see Figure 11 to Figure 14), in 1 dB steps between 0 dB and 6 dB, via SPI control bits INTREF[2:0] (when bit INTREF_EN = logic 1; see Table 21). The equivalent reference circuit is shown in Figure 10. An external reference is also possible by providing a voltage on pin VREF as described in Figure 13. Fig 9. Dual transformer configuration 005aaa071 100 nF 100 nF 100 nF 100 nF 12 Ω 12 Ω 8.2 pF 50 Ω 50 Ω 50 Ω 50 Ω ADT1-1WT ADT1-1WT Analog input INAP INBP INAM VCM INBM |
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