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參數(shù)資料
| 型號： | LTC1289CIJ |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 3 Volt Single Chip 12-Bit Data Acquisition System |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| 封裝： | 0.300 INCH, CERDIP-20 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大?。?/td> | 487K |
| 代理商： | LTC1289CIJ |
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21
LTC1289
output spectrum of the LTC1289 is shown in Figures 17a
and 17b. The input (f
IN
) frequencies are 1kHz and 12kHz
with the sampling frequency (f
S
) at 25kHz. The SNR
obtained from the plot are 72.92dB and 72.23dB.
Rewriting the SNR expression it is possible to obtain the
equivalent resolution based on the SNR measurement.
This is the so-called effective number of bits (ENOB). For
the example shown in Figures 17a and 17b, N = 11.8 bits
and 11.7 bits, respectively. Figure 18 shows a plot of ENOB
as a function of input frequency. The curve shows the A/
D’s ENOB remain in the range of 11.8 to 11.7 for input
frequencies up to f
S
/2
U
S
A
O
PPLICATI
U
U
7. LTC1289 AC Characteristics
Two commonly used figures of merit for specifying the
dynamic performance of the A/D’s in digital signal pro-
cessing applications are the Signal-to-Noise Ratio (SNR)
and the “effective number of bits (ENOB).” SNR is defined
as the ratio of the RMS magnitude of the fundamental to
the RMS magnitude of all the nonfundamental signals up
to the Nyquist frequency (half the sampling frequency).
The theoretical maximum SNR for a sine wave input is
given by:
SNR = (6.02N + 1.76dB)
where N is the number of bits. Thus the SNR is a function
of the resolution of the A/D. For an ideal 12-bit A/D the SNR
is equal to 74dB. A Fast Fourier Transform(FFT) plot of the
FREQUENCY (kHz)
0
–60
–40
0
6
10
LT
C1289 F17a
–80
–100
2
4
8
12
14
–120
–140
–20
M
Figure 17a. f
IN
= 1kHz, f
S
= 25kHz, SNR = 72.92dB
FREQUENCY (kHz)
0
–60
–40
0
6
10
LT
C1289 F19
–80
–100
2
4
8
12
14
–120
–140
–20
M
Figure 19. f
IN
1 = 2.6kHz, f
IN
2 = 3.1kHz, f
S
= 25kHz
Figure 17b. f
IN
= 12kHz, f
S
= 25kHz, SNR = 72.23dB
FREQUENCY (kHz)
0
–60
–40
0
6
10
LT
C1289 F17b
–80
–100
2
4
8
12
14
–120
–140
–20
M
Figure 18. LTC1289 ENOB vs Input Frequency
FREQUENCY (kHz)
0
6
E
7
8
9
10
11
12
10
20
30
40
LTC1289 AIF18
50
F
S
= 25kHz
SNR – 1.76dB
6.02
N =
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1289CIN | 3 Volt Single Chip 12-Bit Data Acquisition System |
| LTC1290DISW | Single Chip 12-Bit Data Acquisition System |
| LTC1290DIJ | Single Chip 12-Bit Data Acquisition System |
| LTC1290DIN | Single Chip 12-Bit Data Acquisition System |
| LTC1290DM | Single Chip 12-Bit Data Acquisition System |
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| LTC1290BCJ | 制造商:Linear Technology 功能描述:ADC Single SAR 50ksps 12-bit Serial 20-Pin CDIP |
| LTC1290BCN | 功能描述:IC DATA ACQ SYS 12BIT 20-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| LTC1290BCN#PBF | 功能描述:IC DATA ACQ SYS 12BIT 20-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| LTC1290BCSW | 功能描述:IC DATA ACQ SYS 12BIT 20-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| LTC1290BCSW#PBF | 功能描述:IC DATA ACQ SYS 12BIT 20-SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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