AD7938BSU-6 datasheet(10/32 Pages) AD

部件名	AD7938BSU-6

功能描述	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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10 / 32 page

AD7938-6

Rev. 0 | Page 10 of 32

Signal-to-(Noise + Distortion) Ratio (SINAD)

This is 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 sum of all nonfundamental

signals up to half the sampling frequency (fS/2), excluding dc.

The ratio is dependent on 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

Signal-to-(Noise + Distortion) = (6.02 N + 1.76) dB

Thus, for a 12-bit converter, this is 74 dB.

Total Harmonic Distortion (THD)

THD is the ratio of the rms sum of harmonics to the

fundamental. For the AD7938-6, it is defined as

()

1

6

5

4

3

2

V

THD

2

20log

dB

+

−

=

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.

Peak Harmonic or Spurious Noise

Peak harmonic or spurious noise is defined as 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 specification is

determined by the largest harmonic in the spectrum, but for

ADCs where the harmonics are buried in the noise floor, it is a

noise peak.

Intermodulation Distortion

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, etc. Intermodulation distortion terms are those

for which neither m nor n are equal to 0. 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 AD7938-6 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-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.

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 sum of the fundamentals expressed in dBs.

类似零件编号 - AD7938BSU-6

制造商	部件名	数据表	功能描述
Analog Devices	AD7938BSU	1Mb / 32P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer Rev.PrN
	AD7938BSUZ	561Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer REV. C
	AD7938BSUZ	629Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
	AD7938BSUZ-6	819Kb / 33P	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer
	AD7938BSUZ-6REEL7	819Kb / 33P	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer

More results

类似说明 - AD7938BSU-6

制造商	部件名	数据表	功能描述
Analog Devices	AD7938-6	819Kb / 33P	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer
	AD7938-6	599Kb / 32P	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer REV. C
	AD7934-6	750Kb / 28P	4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer REV. A
	AD7934-6	711Kb / 28P	4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer REV. B
	AD7934-6	617Kb / 29P	4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer
	AD7938BSUZ	561Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer REV. C
	AD7938	629Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
	AD7938	1Mb / 32P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer Rev.PrN
	AD7938	561Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer REV. C
	AD7939	561Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer REV. C

More results

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