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參數(shù)資料
| 型號： | EVAL-AD7923CBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD7923 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 200k |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | 0 ~ 2.5 V |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 7.5mW @ 200kSPS，5 V |
| 工作溫度： | -40°C ~ 125°C |
| 已用 IC / 零件： | AD7923 |
| 已供物品： | 板，CD |
| 相關(guān)產(chǎn)品： | AD7923BRUZ-REEL7TR-ND - IC ADC 12BIT 4CH W/SEQ 16TSSOP AD7923BRUZ-REEL-ND - IC ADC 12BIT 4CH W/SEQ 16TSSOP AD7923BRUZ-ND - IC ADC 12BIT 4CH W/SEQ 16TSSOP |
Data Sheet
AD7923
Rev. D | Page 11 of 24
Signal-to-(Noise + Distortion) (SINAD) Ratio
This is 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
SINAD = (6.02N + 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 AD7923, it is defined as
1
2
6
2
5
2
4
2
3
2
log
20
)
(
V
dB
THD
+
=
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.
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