поискавой системы для электроныых деталей |
|
AD7829BRUZ-1 датащи(PDF) 8 Page - Analog Devices |
|
AD7829BRUZ-1 датащи(HTML) 8 Page - Analog Devices |
8 / 20 page AD7829-1 Rev. 0 | Page 8 of 20 TERMINOLOGY As a result, the second and third order terms are specified separately. The calculation of the intermodulation distortion is as per the THD specification, where it is the ratio of the rms sum of the individual distortion products to the rms amplitude of the fundamental expressed in decibels (dB). Signal-to-(Noise + Distortion) Ratio The measured ratio of signal-to-(noise + distortion) at the output of the A/D converter. The signal is the rms amplitude of the fundamental. Noise is the rms sum of all nonfundamental signals up to half the sampling frequency (fS/2), excluding dc. The ratio is dependent upon the number of quantization levels in the digitization process; the more levels, the smaller the quantization noise. The theoretical signal-to-(noise + distortion) ratio for an ideal N-bit converter with a sine wave input is given by Channel-to-Channel Isolation A measure of the level of crosstalk between channels. It is measured by applying a full-scale 20 kHz sine wave signal to one input channel and determining how much that signal is attenuated in each of the other channels. The figure given is the worst case across all eight channels of the AD7829-1. Signal-to-(Noise + Distortion) = (6.02N + 1.76) dB Thus, for an 8-bit converter, this is 50 dB. Relative Accuracy or Endpoint Nonlinearity The maximum deviation from a straight line passing through the endpoints of the ADC transfer function. Total Harmonic Distortion (THD) The ratio of the rms sum of harmonics to the fundamental. For the AD7829-1 it is defined as Differential Nonlinearity The difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. 1 6 5 4 3 2 V V V V V V THD 2 2 2 2 2 log 20 ) dB ( + + + + = Offset Error where V1 is the rms amplitude of the fundamental, and V2, V3, V4, V5, and V6 are the rms amplitudes of the second through the sixth harmonics. The deviation of the 128th code transition (01111111) to (10000000) from the ideal, that is, VMID. Offset Error Match Peak Harmonic or Spurious Noise The difference in offset error between any two channels. The ratio of the rms value of the next largest component in the ADC output spectrum (up to fS/2 and excluding dc) to the rms value of the fundamental. Normally, the value of this specifica- tion is determined by the largest harmonic in the spectrum, but for parts where the harmonics are buried in the noise floor, it will be a noise peak. Zero-Scale Error The deviation of the first code transition (00000000) to (00000001) from the ideal; that is, VMID − 1.25 V + 1 LSB (VDD = 5 V ± 10%), or VMID − 1.0 V + 1 LSB (VDD = 3 V ± 10%). Full-Scale Error Intermodulation Distortion The deviation of the last code transition (11111110) to (11111111) from the ideal; that is, VMID + 1.25 V − 1 LSB (VDD = 5 V ± 10%), or VMID + 1.0 V − 1 LSB (VDD = 3 V ± 10%). With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities creates distortion products at sum and difference frequencies of mfa ± nfb, where m, n = 0, 1, 2, 3… . Intermodulation terms are those for which neither m nor n is equal to zero. For example, the second order terms include (fa + fb) and (fa − fb), while the third order terms include (2fa + fb), (2fa − fb), (fa + 2fb), and (fa − 2fb). The AD7829-1 is tested using the CCIF standard, where two input frequencies near the top end of the input bandwidth are used. In this case, the second and third order terms are of different significance. The second order terms are usually distanced in frequency from the original sine waves, while the third order terms are usually at a frequency close to the input frequencies. Gain Error The deviation of the last code transition (1111 . . . 110) to (1111 . . . 111) from the ideal; that is, VREF − 1 LSB, after the offset error has been adjusted out. Gain Error Match The difference in gain error between any two channels. |
Аналогичный номер детали - AD7829BRUZ-1 |
|
Аналогичное описание - AD7829BRUZ-1 |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |