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參數(shù)資料
| 型號： | LTC2365IS6#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 1MSPS TSOT23-6 |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 12.6mW |
| 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-23-6 細型，TSOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | TSOT-23-6 |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個單端，單極 |
| 配用： | DC1190A-B-ND - BOARD SAR ADC LTC2365 |
LTC2365/LTC2366
11
23656fb
For more information www.linear.com/LTC2365
DC PERFORMANCE
The noise of an ADC can be evaluated in two ways: signal-
to-noiseratio(SNR)inthefrequencydomainandhistogram
in the time domain. The LTC2365/LTC2366 excel in both.
Figures 5 and 6 demonstrate that the LTC2365/LTC2366
have an SNR of over 72dB. The noise in the time domain
histogram is the transition noise associated with a 12-bit
resolutionADCwhichcanbemeasuredwithafixedDCsignal
applied to the input of the ADC. The resulting output codes
are collected over a large number of conversions. The
shape of the distribution of codes will give an indication
of the magnitude of the transition noise. In Figure 4, the
distribution of output codes is shown for a DC input
that has been digitized 16384 times. The distribution is
Gaussian and the RMS code transition is about 0.34LSB.
This corresponds to a noise level of 72.7dB relative to a
full scale of 3V.
applications inForMation
DYNAMIC PERFORMANCE
TheLTC2365/LTC2366haveexcellenthighspeedsampling
capability. Fast fourier transform (FFT) test techniques are
used to test the ADC’s frequency response, distortion and
noise at the rated throughput. By applying a low distortion
sine wave and analyzing the digital output using an FFT
algorithm, the ADC’s spectral content can be examined
for frequencies outside the fundamental. Figures 5 and 6
showtypicalLTC2365andLTC2366FFTplots,respectively.
Figure 5. LTC2365 FFT Plot
Figure 4. Histogram for 16384 Conversions
Figure 6. LTC2366 FFT Plot
CODE
2045
0
COUNT
2000
4000
6000
8000
10000
2046 2047 2048 2049
23656 F04
2050
VDD = 3V
INPUT FREQUENCY (kHz)
0
–40
–20
0
400
23656 F05
–60
–80
100
200
300
500
–100
–120
–140
MAGNITUDE
(dB)
VDD = 3V
fSMPL = 1Msps
fIN = 461kHz
SINAD = 72.8dB
THD = –86.1dB
INPUT FREQUENCY (kHz)
0
–20
–40
–60
–80
–100
–120
–140
750
1250
23656 F06
250
500
1000
1500
MAGNITUE
(dB)
VDD = 3V
fSMPL = 3Msps
fIN = 994kHz
SINAD = 72dB
THD = –80.3dB
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