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參數(shù)資料
| 型號： | LTC1279ISW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 600ksps Sampling A/D Converter with Shutdown |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SO-24 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 327K |
| 代理商： | LTC1279ISW |
9
LTC1279
APPLICATIO
S I
N
FOR
ATIO
U
pared with the binary-weighted charges supplied by the
capacitive DAC. Bit decisions are made by the high speed
comparator. At the end of a conversion, the DAC output
balances the A
IN
input charge. The SAR contents (a 12-bit
data word) which represent the A
IN
are loaded into the
12-bit output latches.
W
U
DYNAMIC PERFORMANCE
The LTC1279 has excellent high speed sampling capabil-
ity. FFT (Fast Fourier Transform) test techniques are used
to test the ADC’s frequency response, distortion and
noise at the rated throughput. By applying a low distor-
tion sine wave and analyzing the digital output using an
FFT algorithm, the ADC’s spectral content can be exam-
ined for frequencies outside the fundamental. Figures 2a
and 2b show typical LTC1279 FFT plots.
Figure 2b. LTC1279 Nonaveraged, 4096 Point FFT Plot
with 300kHz Input Frequency
Signal-to-Noise Ratio
The Signal-to-Noise plus Distortion Ratio [S/(N + D)] is the
ratio between the RMS amplitude of the fundamental input
frequency to the RMS amplitude of all other frequency
components at the A/D output. The output is band limited
to frequencies above DC and below half the sampling
frequency. Figure 2a shows a typical spectral content with
a 600kHz sampling rate and a 100kHz input. The dynamic
performance is excellent for input frequencies up to the
Nyquist limit of 300kHz as shown in Figure 2b.
Effective Number of Bits
The Effective Number of Bits (ENOBs) is a measurement of
the resolution of an ADC and is directly related to the
S/(N + D) by the equation:
N = [S/(N + D) – 1.76]/6.02
where N is the Effective Number of Bits of resolution and
S/(N + D) is expressed in dB. At the maximum sampling
rate of 600kHz the LTC1279 maintains very good ENOBs up
to the Nyquist input frequency of 300kHz. Refer to Figure 3.
Total Harmonic Distortion
Total Harmonic Distortion (THD) is the ratio of the RMS
sum of all harmonics of the input signal to the fundamental
itself. The out-of-band harmonics alias into the frequency
band between DC and half the sampling frequency. THD is
expressed as:
Figure 3. Effective Bits and Signal/(Noise + Distortion) vs
Input Frequency
FREQUENCY (Hz)
10k
E
S
100k
1M
5M
1279 G03
12
11
10
9
8
7
6
5
4
3
2
1
0
74
68
62
56
50
f
SAMPLE
= 600kHz
NYQUIST
FREQUENCY
FREQUENCY (kHz)
0
A
50
100
150
200
1279 F02a
250
300
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
f
SAMPLE
= 600kHz
f
IN
FREQUENCY (kHz)
0
A
50
100
150
200
1279 F02
250
300
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
f
SAMPLE
= 600kHz
f
IN
Figure 2a. LTC1279 Nonaveraged, 4096 Point FFT Plot
with 100kHz Input Frequency
相關PDF資料 |
PDF描述 |
|---|---|
| LTC1279CSW | 12-Bit, 600ksps Sampling A/D Converter with Shutdown |
| LTC1279I | 12-Bit, 600ksps Sampling A/D Converter with Shutdown |
| LTC1279 | 12-Bit, 600ksps，Sampling A/D Converters with Shutdown(600ksps，12位采樣A/D轉換器（帶關斷）) |
| LTC1282AC | 3V 140ksps 12-Bit Sampling A/D Converter with Reference |
| LTC1282ACN | 3V 140ksps 12-Bit Sampling A/D Converter with Reference |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1279ISW#PBF | 功能描述:IC A/DCONV SAMPLNG W/SHTDN24SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| LTC1279ISW#TR | 功能描述:IC ADC 12BIT SAMPL SHTDWN 24SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| LTC1279ISW#TRPBF | 功能描述:IC A/DCONV SAMPLNG W/SHTDN24SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| LTC1282ACN | 功能描述:IC A/D CONV SAMPLING W/REF 24DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| LTC1282ACN#PBF | 功能描述:IC A/D CONV SAMPLING W/REF 24DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
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