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AD1671KP Datenblatt(PDF) 8 Page - Analog Devices |
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AD1671KP Datenblatt(HTML) 8 Page - Analog Devices |
8 / 16 page AD1671 REV. B –8– 85 40 0 50 45 –45 –50 55 60 65 70 75 80 –5 –10 –15 –20 –25 –30 –35 –40 ANALOG INPUT – dB Figure 7. Spurious Free Dynamic Range vs. Input Amplitude, fIN = 250 kHz APPLYING THE AD1671 GROUNDING AND DECOUPLING RULES Proper grounding and decoupling should be a primary design objective in any high speed, high resolution system. The AD1671 separates analog and digital grounds to optimize the management of analog and digital ground currents in a system. The AD1671 is designed to minimize the current flowing from REF COM (Pin 20) by directing the majority of the current from VCC (+5 V–Pin 28) to VEE (–5 V–Pin 1). Minimizing ana- log ground currents hence reduces the potential for large ground voltage drops. This can be especially true in systems that do not utilize ground planes or wide ground runs. REF COM is also configured to be code independent, therefore reducing input de- pendent analog ground voltage drops and errors. Code depen- dent ground current is diverted to ACOM (Pin 27). Also critical in any high speed digital design is the use of proper digital grounding techniques to avoid potential CMOS “ground bounce.” Figure 3 is provided to assist in the proper layout, grounding and decoupling techniques. AIN1 REF IN BPO/UPO ACOM BIT 1 BIT 12 DCOM AD1671 ENCODE DAV OTR MSB AGP* DGP* +5V –5V *GROUND PLANE RECOMMENDED AIN2 REF OUT SHA OUT REF COM 1 µF VCC VEE VLOGIC V ( ±5V) IN 1 18 28 +5V 0.1 µF 10 µF 23 22 20 27 19 25 26 24 21 13 2 17 16 15 14 0.1 µF10µF 0.1 µF10µF Figure 8. AD1671 Grounding and Decoupling Figure 4 plots both S/(N+D) and Effective Number of Bits (ENOB) for a 100 kHz input signal sampled from 666 kHz to 1.25 MHz. SAMPLING FREQUENCY – kHz 72.5 68 1250 68.5 70.5 714 666 69 69.5 70 71 71.5 72 1111 1000 909 833 769 11.75 11.50 11.25 11.00 Figure 4. S/(N/D) vs. Sampling Frequency, fIN = 100 kHz Figure 5 is a THD plot for a full-scale 100 kHz input signal with the sample frequency swept from 666 kHz to 1.25 MHz. –68 –86 1250 –84 –76 714 666 –82 –80 –78 –74 –72 –70 1111 1000 909 833 769 SAMPLING FREQUENCY – kHz Figure 5. THD vs. Sampling Rate, fIN = 100 kHz The AD1671’s SFDR performance is ideal for use in communi- cation systems such as high speed modems and digital radios. The SFDR is better than 84 dB with sample rates up to 1.11 MHz and increases as the input signal amplitude is attenuated by ap- proximately 3 dB. Note also the SFDR is typically better than 80 dB with input signals attenuated by up to –7 dB. 1250 714 666 1111 1000 909 833 769 SAMPLING FREQUENCY – kHz –86 –68 –84 –76 –82 –80 –78 –74 –72 –70 –88 –90 Figure 6. Spurious Free Dynamic Range vs. Sampling Rate, fIN = 100 kHz |
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