AD7453BRT-REEL7 datasheet(7/20 Pages) AD

Nome de Peças	AD7453BRT-REEL7

Descrição Electrónicos	Pseudo Differential, 555 kSPS, 12-Bit ADC in an 8-Lead SOT-23

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Fabricante Electrônico	AD [Analog Devices]

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REV. 0

–7–

AD7453

TERMINOLOGY

Signal to (Noise + Distortion) Ratio

This is the measured ratio of signal to (noise + distortion) at the

output of the ADC. 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 digitiza-

tion 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

N

dB

+

() =+

()

602

1 76

..

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

Total Harmonic Distortion (THD)

Total harmonic distortion is the ratio of the rms sum of har-

monics to the fundamental. For the AD7453, it is defined as

THD dB

VVV

VV

V

() =

++

20

2

3

2

4

2

5

2

6

2

1

log

where V1 is the rms amplitude of the fundamental and V2, V3,

V4, V5, and V6 are the rms amplitudes of the second to 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 deter-

mined by the largest harmonic in the spectrum, but for ADCs

where the harmonics are buried in the noise floor, it will be a

noise peak.

Intermodulation Distortion

With inputs consisting of sine waves at two frequencies, fa and

fb, any active device with nonlinearities will create distortion

products at sum and difference frequencies of mfa

± nfb where

m, n = 0, 1, 2, 3, and so on. Intermodulation distortion terms

are those for which neither m nor n are 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 AD7453 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 fre-

quencies. 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 dB.

Aperture Delay

This is the amount of time from the leading edge of the sampling

clock until the ADC actually takes the sample.

Aperture Jitter

This is the sample to sample variation in the effective point in

time at which the actual sample is taken.

Full Power Bandwidth

The full power bandwidth of an ADC is that input frequency at

which the amplitude of the reconstructed fundamental is reduced

by 0.1 dB or 3 dB for a full scale input.

Integral Nonlinearity (INL)

This is the maximum deviation from a straight line passing

through the endpoints of the ADC transfer function.

Differential Nonlinearity (DNL)

This is the difference between the measured and the ideal 1 LSB

change between any two adjacent codes in the ADC.

Offset Error

This is the deviation of the first code transition (000...000 to

000...001) from the ideal (i.e., AGND + 1 LSB)

Gain Error

This is the deviation of the last code transition (111...110 to

111...111) from the ideal (i.e., VREF – 1 LSB), after the Offset

Error has been adjusted out.

Track-and-Hold Acquisition Time

The track-and-hold acquisition time is the minimum time

required for the track and hold amplifier to remain in track

mode for its output to reach and settle to within 0.5 LSB of

the applied input signal.

Power Supply Rejection Ratio (PSRR)

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 p-p sine wave applied to the ADC VDD supply of

frequency fs. The frequency of this input varies from 1 kHz

to 1 MHz.

PSRR dB

Pf Pfs

()=

()

10 log

/

Pf is the power at frequency f in the ADC output; Pfs is the

power at frequency fs in the ADC output.

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