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LTC1857 Datasheet(PDF) 28 Page - Linear Technology |
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LTC1857 Datasheet(HTML) 28 Page - Linear Technology |
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28 / 40 page  LTC2335-16 28 233516f For more information www.linear.com/LTC2335-16 conversions following an idle period. Figure 12 compares the burst conversion response of the LTC2335-16 with an input near full scale for two reference configurations. The first configuration employs the internal reference buffer with REFIN externally overdriven by an LTC6655-2.048, while the second configuration disables the internal ref- erence buffer and overdrives REFBUF with an external LTC6655-4.096. In both cases REFBUF is bypassed to GND with a 47µF ceramic capacitor. Signal-to-Noise Ratio (SNR) The signal-to-noise ratio (SNR) is the ratio between the RMS amplitude of the fundamental input frequency and the RMS amplitude of all other frequency components except the first five harmonics and DC. Figure 13 shows that the LTC2335-16 achieves a typical SNR of 94.4dB in the ±10.24V range at a 1Msps sampling rate with a true bipolar 2kHz input signal. Total Harmonic Distortion (THD) Totalharmonicdistortion(THD)istheratiooftheRMSsum ofallharmonicsoftheinputsignaltothefundamentalitself. The out-of-band harmonics alias into the frequency band between DC and half the sampling frequency (fSMPL/2). THD is expressed as: THD = 20log V22 + V32 + V42...VN2 V1 where V1 is the RMS amplitude of the fundamental fre- quencyandV2throughVNaretheamplitudesofthesecond throughNthharmonics,respectively.Figure13showsthat the LTC2335-16 achieves a typical THD of –109dB (N = 6) in the ±10.24V range at a 1Msps sampling rate with a true bipolar 2kHz input signal. applicaTions inForMaTion Figure 13. 32k Point FFT fSMPL = 1Msps, fIN = 2kHz Figure 12. Burst Conversion Response of the LTC2335-16, fSMPL = 1Msps DYNAMIC PERFORMANCE Fast Fourier transform (FFT) techniques are used to test the ADC’s frequency response, distortion, and noise at the rated throughput. By applying a low distortion sine wave and analyzing the digital output using an FFT algorithm, the ADC’s spectral content can be examined for frequen- cies outside the fundamental. The LTC2335-16 provides guaranteed tested limits for both AC distortion and noise measurements. Signal-to-Noise and Distortion Ratio (SINAD) The signal-to-noise and distortion ratio (SINAD) is the ratio between the RMS amplitude of the fundamental input frequency and the RMS amplitude of all other frequency components at the A/D output. The output is band-limited to frequencies below half the sampling frequency, exclud- ing DC. Figure 13 shows that the LTC2335-16 achieves a typical SINAD of 94.3dB in the ±10.24V range at a 1Msps sampling rate with a true bipolar 2kHz input signal. EXTERNAL REFERNCE ON REFBUF INTERNAL REFERENCE BUFFER ±10.24V RANGE IN+ = 10V IN– = 0V TIME (µs) 0 100 200 300 400 500 –1 0 1 2 3 233516 F12 ±10.24V RANGE TRUE BIPOLAR DRIVE (IN– = 0V) SNR = 94.5dB THD = –109dB SINAD = 94.4dB SFDR = 111dB FREQUENCY (kHz) 0 100 200 300 400 500 –180 –160 –140 –120 –100 –80 –60 –40 –20 0 233516 F13 |
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Similar Description - LTC1857 |
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