전자부품 데이터시트 검색엔진 |
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AD7898AR10 데이터시트(PDF) 7 Page - Analog Devices |
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AD7898AR10 데이터시트(HTML) 7 Page - Analog Devices |
7 / 16 page PERFORMANCE CURVES TPC 1 shows a typical FFT plot for the AD7898 at 220 kSPS sampling rate with a 30 kHz input frequency while operating in Mode 0. –15 –35 –55 –95 –115 5 –75 FREQUENCY – kHz 100 80 60 40 20 0 8192 POINT FFT fSAMPLE = 220kSPS fIN = 30kHz SINAD = 71.823dB THD = –90.28dB SFDR = –91.467dB TPC 1. Mode 0 Dynamic Performance TPC 2 shows a typical FFT plot for the AD7898 at 220 kSPS sampling rate with a 30 kHz input frequency while operating in Mode 1. –15 –35 –55 –95 –115 5 –75 FREQUENCY – kHz 100 80 60 40 20 0 8192 POINT FFT fSAMPLE = 220kSPS fIN = 30kHz SINAD = 71.779dB THD = –88.337dB SFDR = –89.639dB TPC 2. Mode 1 Dynamic Performance TPC 3 shows the Power Supply Rejection Ratio versus supply frequency for the AD7898. The power supply rejection ratio is defined as the ratio of the power in the ADC output at full-scale frequency f, to the power of a 100 mV sine wave applied to the ADC VDD supply of frequency fS. PSRR (dB) = 10 log (Pf/Pfs) Pf = Power at frequency f in ADC output, Pfs = power at fre- quency fs coupled on to the ADC VDD supply input. Here a 100 mV peak-to-peak sine wave is coupled onto the VDD supply. 100 nF decoupling was used on the supply. INPUT FREQUENCY – kHz –40 –50 –70 –80 80 60 40 20 10 0 –20 –30 –60 70 50 30 TPC 3. PSRR vs. Supply Ripple Frequency TPC 4 shows a graph of effective number of bits versus input frequency while sampling at 220 kSPS. INPUT FREQUENCY – kHz 11.7 11.6 11.4 11.2 100 80 40 20 0 11.9 11.8 11.5 60 11.3 TPC 4. Effective Number of Bits vs. Input Frequency at 220 kSPS The effective number of bits for a device can be calculated from its measured Signal to (Noise + Distortion) Ratio (see Termi- nology section). TPC 4 shows a typical plot of effective number of bits versus frequency for the AD7898 from dc to fSAMPLE/2. The sampling frequency is 220 kSPS. The formula for Signal to (Noise + Distortion) Ratio is related to the resolution or number of bits in the converter. Rewriting the formula, below, gives a measure of performance expressed in effective number of bits (N): N = (SNR – 1.76)/6.02 where SNR is Signal to (Noise + Distortion) Ratio. –7– REV. A Typical Performance Characteristics–AD7898 |
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