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AD1876 Datasheet(Fiches technique) 4 Page - Analog Devices

Numéro de pièce AD1876
Description  16-Bit 100 kSPS Sampling ADC
Télécharger  12 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD1876 Datasheet(HTML) 4 Page - Analog Devices

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AD1876
REV. A
–4–
CLK
BUSY
CAL
tCALB
tC
tCH
tCL
tCB
tCT
Figure 1. AD1876 Calibration Timing
DOUT CLK
CLK
SAMPLE
BUSY
LSB
MSB
1
2
3
16
17
tS (=1/fs)
tCDH
PREVIOUS LSB
X
tDCL
tCD
tSC
tCB
tC
tCH
tCL
tCB
tSL
tA
tA
DOUT
Figure 2. Recommended AD1876 Conversion Timing
Definition of Specifications
NYQUIST FREQUENCY
An implication of the Nyquist sampling theorem, the “Nyquist
Frequency” of a converter is that input frequency which is one-
half the sampling frequency of the converter.
TOTAL HARMONIC DISTORTION
Total harmonic distortion (THD) is measured as the ratio of the
rms sum of the first nineteen harmonic components to the rms
value of a 1 kHz full-scale sine wave input signal and is ex-
pressed in percent (%) or decibels (dB). For input signals or
harmonics that are above the Nyquist frequency, the aliased
component is used.
SIGNAL-TO-NOISE PLUS DISTORTION RATIO
Signal-to-noise plus distortion (S/N+D) is defined to be the ra-
tio of the rms value of the measured input signal to the rms sum
of all other spectral components below the Nyquist frequency,
including harmonics but excluding dc.
D-RANGE DISTORTION
D-range distortion is the ratio of the distortion plus noise to the
signal at a signal amplitude of –60 dB. In this case, an A-weight
filter is used. The value specified for D-range performance is the
ratio measured plus 60 dB.
BANDWIDTH
The full power bandwidth is that input frequency at which the
amplitude of the reconstructed fundamental is reduced by 3 dB
for a full-scale input.
INTERMODULATION DISTORTION (IMD)
With inputs consisting of sine waves at two frequencies, fa and
fb, any device with nonlinearities will create distortion products,
of order (m+n), at sum and difference frequencies of mfa
± nf
b,
where m, n = 0, l, 2, 3. . . . Intermodulation terms are those for
which m or n is not equal to zero. For example, the second or-
der terms are (fa + fb) and (fa – fb), and the third order terms are
(2fa + fb), (2fa – fb), (fa + 2fb) and (fa – 2fb). The IMD products
are expressed as the decibel ratio of the rms sum of the mea-
sured input signals to the rms sum of the distortion terms. The
two signals applied to the converter are of equal amplitude, and
the peak value of their sum is –0.05 dB from full scale. The
IMD products are normalized to a 0 dB input signal.
APERTURE DELAY
Aperture delay is the time required after SAMPLE is taken
LOW for the internal sample-hold of the AD1876 to open, thus
holding the value of VIN.
APERTURE JITTER
Aperture jitter is the variation in the aperture delay from sample
to sample.


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