AD7265BCPZ-REEL7 datasheet(11/28 Pages) AD

부품명	AD7265BCPZ-REEL7

상세설명	Differential/Single-Ended Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR ADC

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AD7265

Rev. A | Page 11 of 28

TERMINOLOGY

Differential Nonlinearity (DNL)

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

Differential nonlinearity is the difference between the measured

and the ideal 1 LSB change between any two adjacent codes in

the ADC.

SINAD 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 non-fundamental signals

up to half the sampling frequency (f

Integral Nonlinearity (INL)

S

/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

Integral nonlinearity is the maximum deviation from a straight

line passing through the endpoints of the ADC transfer function.

The endpoints of the transfer function are zero scale with a

single (1) LSB point below the first code transition, and full scale

with a 1 LSB point above the last code transition.

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

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

Offset Error

Offset error applies to straight binary output coding. It is the

deviation of the first code transition (00 . . . 000) to (00 . . . 001)

from the ideal (AGND + 1 LSB).

Total Harmonic Distortion (THD)

Total harmonic distortion is the ratio of the rms sum of

harmonics to the fundamental. For the AD7265, it is defined as

Offset Error Match

1

2

6

2

5

2

4

2

3

2

log

20

)

(

V

dB

THD

+

=

Offset error match is the difference in offset error across all

12 channels.

where:

Gain Error

Gain error applies to straight binary output coding. It is the

deviation of the last code transition (111 . . . 110) to (111 . . .

111) from the ideal (VREF − 1 LSB) after the offset error is

adjusted out. Gain error does not include reference error.

V is the rms amplitude of the fundamental.

1

V , V , V , V

Gain Error Match

Gain error match is the difference in gain error across all

12 channels.

Zero Code Error

Zero code error applies when using twos complement output

coding with, for example, the 2 × VREF input range as −VREF

to +VREF biased about the VREF point. It is the deviation of

the midscale transition (all 1s to all 0s) from the ideal VIN

voltage (VREF).

Zero Code Error Match

Zero code error match refers to the difference in zero code error

across all 12 channels.

Positive Gain Error

This applies when using twos complement output coding with,

for example, the 2 × VREF input range as −VREF to +VREF biased

about the VREF point. It is the deviation of the last code transition

(011…110) to (011…111) from the ideal (+VREF − 1 LSB) after

the zero code error is adjusted out.

Track-and-Hold Acquisition Time

The track-and-hold amplifier returns to track mode after the

end of conversion. Track-and-hold acquisition time is the time

required for the output of the track-and-hold amplifier to reach

its final value, within ±1/2 LSB, after the end of conversion.

2

3

4

5

, 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, 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.

Channel-to-Channel Isolation

Channel-to-channel isolation is a measure of the level of

crosstalk between channels. It is measured by applying a full-

scale (2 × V

when V

= 5 V , and V

when V

REF

DD

REF

DD

= 3 V),

10 kHz sine wave signal to all unselected input channels and

determining how much that signal is attenuated in the selected

channel with a 50 kHz signal (0 V to VREF). The result obtained

is the worst-case across all 12 channels for the AD7265.

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, 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).

유사한 부품 번호 - AD7265BCPZ-REEL7

제조업체	부품명	데이터시트	상세설명
Analog Devices	AD7265BCPZ-REEL7	810Kb / 29P	Differential/Single-Ended Input, 1 MSPS, 12-Bit, 3-Channel Dual SAR ADC

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유사한 설명 - AD7265BCPZ-REEL7

제조업체	부품명	데이터시트	상세설명
Analog Devices	AD7265	812Kb / 29P	Differential/Single-Ended Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR ADC REV. A
	AD7265	810Kb / 29P	Differential/Single-Ended Input, 1 MSPS, 12-Bit, 3-Channel Dual SAR ADC
	AD7266BSUZ	644Kb / 28P	Differential/Single-Ended Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC REV. B
	AD7266	889Kb / 29P	Differential/Single-Ended Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC REV. B
	AD7266	691Kb / 29P	Differential/Single-Ended Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC
	AD7265	706Kb / 16P	Differential Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR ADC Rev. PrA
	AD7266	752Kb / 17P	Differential Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC Rev. PrG
	AD7356	191Kb / 18P	Differential Input, Dual, 5 MSPS, 12-Bit, SAR ADC Rev. PrC
	AD7352	515Kb / 21P	Differential Input, Dual, Simultaneous ampling, 3 MSPS, 12-Bit, SAR ADC
	AD7352	518Kb / 20P	Differential Input, Dual, Simultaneous Sampling, 3 MSPS, 12-Bit, SAR ADC REV. 0

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