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参数资料
| 型号： | LTC1294BCJ |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| 封装： | CERDIP-20 |
| 文件页数： | 16/28页 |
| 文件大小： | 383K |
| 代理商： | LTC1294BCJ |
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23
LTC1293/LTC1294/LTC1296
129346fs
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
FREQUENCY (kHz)
0
EFFECTIVE
NUMBER
OF
BITS
9.5
10.0
10.5
60
100
LT1293 F17
9.0
8.5
8.0
20
40
80
11.0
11.5
12.0
fS = 45.4kHz
±5V SUPPLIES
+5V SUPPLY
For +5V supplies the ENOB decreases more rapidly. This
is due predominantly to the 2nd harmonic distortion term.
Figure 18 shows a FFT plot of the output spectrum for two
tones applied to the input of the A/D. Nonlinearities in the
A/D will cause distortion products at the sum and differ-
ence frequencies of the fundamentals and products of the
fundamentals. This is classically referred to as
intermodulation distortion (IMD).
Overvoltage Protection
Applying signals to the LTC1293/4/6’s analog inputs that
exceed the positive supply or that go below V
– will
degrade the accuracy of the A/D and possibly damage the
device. For example this condition would occur if a signal
is applied to the analog inputs before power is applied to
the LTC1293/4/6. Another example is the input source is
operating from different supplies of larger value than the
LTC1293/4/6. These conditions should be prevented ei-
ther with proper supply sequencing or by use of external
circuitry to clamp or current limit the input source. There
are two ways to protect the inputs. In Figure 19 diode
clamps from the inputs to VCC and V
– are used. The
second method is to put resistors in series with the analog
inputs for current limiting. As shown in Figure 20a, a 1k
resistor is enough to stand off
±15V (15mA for only one
channel). If more than one channel exceeds the supplies
than the following guidelines can be used. Limit the
current to 7mA per channel and 28mA for all channels.
FREQUENCY (kHz)
0
MAGNITUDE
(dB)
–40
–20
0
15
1293 F16a
–60
–80
20
–100
–120
–140
25
10
5
FREQUENCY (kHz)
0
MAGNITUDE
(dB)
–40
–20
0
15
1293 F16b
–60
–80
20
–100
–120
–140
25
10
5
FREQUENCY (kHz)
0
MAGNITUDE
(dB)
–40
–20
0
15
1293 F8
–60
–80
20
–100
–120
–140
25
10
5
Figure 16b. LTC1294 FFT Plot
fIN = 22kHz, fS = 45.4kHz,
SNR = 72.5dB with
±5V Supplies
Figure 16a. LTC1294 FFT Plot
fIN = 1kHz, fS = 45.4kHz,
SNR = 72.7dB with
±5V Supplies
Figure 17. LTC1294 ENOB vs Input Frequency
Figure 18. LTC1294 FFT Plot
fIN1 = 5.1kHz, fIN2 = 5.6kHz, fS = 45.4kHz
with
±5V Supplies
相关PDF资料 |
PDF描述 |
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| LTC1294CCJ | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
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| LTC1296CCJ | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| LTC1294DCJ | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1294BCN | 功能描述:IC DATA ACQ SYSTEM 12BIT 20-DIP RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| LTC1294BCN#PBF | 功能描述:IC DATA ACQ SYSTEM 12BIT 20-DIP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| LTC1294BCSW | 功能描述:IC DATA ACQ SYSTEM 12BIT 20-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| LTC1294BCSW#PBF | 功能描述:IC DATA ACQ SYSTEM 12BIT 20-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| LTC1294BCSW#TR | 功能描述:IC DATA ACQ SYS 12BIT 5V 20SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
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