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參數(shù)資料
| 型號(hào)： | AD7457BRTZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 3/21頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT PSEUDO-DIFF SOT23-8 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 3mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-8 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-8 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸入數(shù)目和類型： | 1 個(gè)偽差分，雙極 |
| 產(chǎn)品目錄頁(yè)面： | 777 (CN2011-ZH PDF) |
| 其它名稱： | AD7457BRTZ-REEL7DKR |
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AD7457
Rev. A | Page 10 of 20
TERMINOLOGY
Signal to (Noise + Distortion) Ratio (SINAD)
The measured ratio of SINAD 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 digitization process; the
more levels, the smaller the quantization noise. The theoretical
SINAD ratio for an ideal N-bit converter with a sine wave input
is given by
(
) (
)dB
76
.
1
02
.
6
+
=
+
N
Distortion
Noise
to
Signal
Therefore, for a 12-bit converter, the SINAD is 74 dB.
Total Harmonic Distortion (THD)
The ratio of the rms sum of harmonics to the fundamental. For
the AD7457, it is defined as
()
1
2
6
2
5
2
4
2
3
2
20
dB
V
log
THD
+
=
where:
V1
is the rms amplitude of the fundamental.
V2
, V3, V4, V5, and V6 are the rms amplitudes of the second to the
sixth harmonics.
Peak Harmonic or Spurious Noise
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 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 prod-
ucts 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 AD7457 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 fre-
quency 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
total harmonic distortion 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
The amount of time from the leading edge of the sampling
clock until the ADC actually takes the sample.
Aperture Jitter
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)
The maximum deviation from a straight line passing through
the endpoints of the ADC transfer function.
Differential Nonlinearity (DNL)
The difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
from the ideal (that is, AGND + 1 LSB).
Gain Error
The deviation of the last code transition (111...110 to 111...111)
from the ideal (that is, VREF 1 LSB), after the offset error has
been adjusted out.
Track-and-Hold Acquisition Time
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 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) = 10 log(Pf/Pfs)
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD745AN | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultralow Noise, High Speed, BiFET Op Amp |
| AD745AQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| AD745AR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Operational Amplifier |
| AD745BQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD745JN | 制造商:Rochester Electronics LLC 功能描述:ULTRA-LOW NOISE OP-AMP IC - Bulk 制造商:Analog Devices 功能描述: |
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