- 您现在的位置：买卖IC网 > PDF目录10534 > LTC1279CG (Linear Technology)IC A/DCONV SAMPLNG W/SHTDN24SSOP PDF资料下载
参数资料
| 型号： | LTC1279CG |
| 厂商： | Linear Technology |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC A/DCONV SAMPLNG W/SHTDN24SSOP |
| 标准包装： | 47 |
| 位数： | 12 |
| 采样率（每秒）： | 600k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 120mW |
| 电压电源： | 双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
| 产品目录页面： | 1346 (CN2011-ZH PDF) |
10
LTC1279
APPLICATIONS INFORMATION
WU
U
THD = 20log
√V
2
2 + V32 + V42 ... + VN2
V1
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through VN are the amplitudes of the
second through Nth harmonics. THD versus input fre-
quency is shown in Figure 4. The LTC1279 has good
distortion performance up to the Nyquist frequency and
beyond.
Intermodulation Distortion
If the ADC input signal consists of more than one spectral
component, the ADC transfer function nonlinearity can
produce intermodulation distortion (IMD) in addition to
THD. IMD is the change in one sinusoidal input caused by
the presence of another sinusoidal input at a different
frequency.
If two pure sine waves of frequencies fa and fb are applied
to the ADC input, nonlinearities in the ADC transfer func-
tion can create distortion products at sum and difference
frequencies of mfa
± nfb, where m and n = 0, 1, 2, 3, etc.
For example, the 2nd order IMD terms include (fa + fb) and
(fa – fb) while the 3rd order IMD terms include (2fa + fb),
(2fa – fb), (fa + 2fb), and (fa – 2fb). If the two input sine
waves are equal in magnitude, the value (in decibels) of
the 2nd order IMD products can be expressed by the
following formula:
IMD (fa ± fb) = 20log
Amplitude at (fa ± fb)
Amplitude at fa
INPUT FREQUENCY (Hz)
10k
AMPLITUDE
(dB
BELOW
THE
FUNDAMENTAL)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
100k
1M
1279 G06
2M
THD
2ND HARMONIC
3RD HARMONIC
fSAMPLE = 600kHz
Figure 4. Distortion vs Input Frequency
Figure 5 shows the IMD performance at a 100kHz input.
Figure 5. Intermodulation Distortion Plot
Peak Harmonic or Spurious Noise
The peak harmonic or spurious noise is the largest spec-
tral component excluding the input signal and DC. This
value is expressed in decibels relative to the RMS value of
a full scale input signal.
Full Power and Full Linear Bandwidth
The full power bandwidth is that input frequency at which
the amplitude of the reconstructed fundamental is re-
duced by 3dB for a full scale input signal.
The full linear bandwidth is the input frequency at which
the S/(N + D) has dropped to 68dB (11 effective bits). The
LTC1279 has been designed to optimize input bandwidth,
allowing ADC to undersample input signals with frequen-
cies above the converter’s Nyquist Frequency. The noise
floor stays very low at high frequencies; S/(N + D) be-
comes dominated by distortion at frequencies far beyond
Nyquist.
Driving the Analog Input
The LTC1279’s analog input is easy to drive. It draws only
one small current spike while charging the sample-and-
hold capacitor at the end of conversion. During conversion
the analog input draws no current. The only requirement
is that the amplifier driving the analog input must settle
after the small current spike before the next conversion
starts. Any op amp that settles in 160ns to small current
transients will allow maximum speed operation. If slower
FREQUENCY (kHz)
0
AMPLITUDE
(dB)
50
100
150
200
1279 G08
250
300
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fSAMPLE = 600kHz
fa = 94.189kHz
fb = 97.705kHz
(fb – fa)
(2fa – fb)
(2fa)
(2fb)
(3fa)
(2fb – fa)
(fa) (fb)
(fa + fb) (2fa + fb)
(fa + 2fb)
(3fb)
相关PDF资料 |
PDF描述 |
|---|---|
| VI-BTN-IV-F4 | CONVERTER MOD DC/DC 18.5V 150W |
| VI-BTN-IV-F3 | CONVERTER MOD DC/DC 18.5V 150W |
| VI-BTN-IV-F2 | CONVERTER MOD DC/DC 18.5V 150W |
| VI-BTL-IV-F2 | CONVERTER MOD DC/DC 28V 150W |
| VI-BTL-IV-F1 | CONVERTER MOD DC/DC 28V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1279CG#PBF | 功能描述:IC A/DCONV SAMPLNG W/SHTDN24SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| LTC1279CG#TR | 功能描述:IC ADC 12BIT SAMPL SHTDWN 24SSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| LTC1279CG#TRPBF | 功能描述:IC A/DCONV SAMPLNG W/SHTDN24SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| LTC1279CSW | 功能描述:IC A/DCONV SAMPLNG W/SHTDN24SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| LTC1279CSW#PBF | 功能描述:IC A/DCONV SAMPLNG W/SHTDN24SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
发布紧急采购，3分钟左右您将得到回复。