- 您现在的位置：买卖IC网 > PDF目录39414 > LTC2246HLU#TR (LINEAR TECHNOLOGY CORP) 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 PDF资料下载
参数资料
| 型号： | LTC2246HLU#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 |
| 封装： | 5 X 5 MM, PLASTIC, MS-026, TQFP-32 |
| 文件页数： | 16/16页 |
| 文件大小： | 273K |
| 代理商： | LTC2246HLU#TR |
LTC2246H
9
2246hf
DYNAMIC PERFORMANCE
Signal-to-Noise Plus Distortion Ratio
The signal-to-noise plus distortion ratio [S/(N + D)] is
the ratio between the RMS amplitude of the fundamen-
tal input frequency and the RMS amplitude of all other
frequency components at the ADC output. The output is
band limited to frequencies above DC to below half the
sampling frequency.
Signal-to-Noise Ratio
The signal-to-noise ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency and
the RMS amplitude of all other frequency components
except the rst ve harmonics and DC.
Total Harmonic Distortion
Total harmonic distortion 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:
THD = 20Log (√(V22 + 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. The THD calculated in this data
sheet uses all the harmonics up to the fth.
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 ap-
plied to the ADC input, nonlinearities in the ADC transfer
function can create distortion products at the sum and
difference frequencies of mfa ± nfb, where m and n = 0,
1, 2, 3, etc. The 3rd order intermodulation products are
2fa + fb, 2fb + fa, 2fa – fb and 2fb – fa. The intermodula-
tion distortion is dened as the ratio of the RMS value of
APPLICATIONS INFORMATION
either input tone to the RMS value of the largest 3rd order
intermodulation product.
Spurious Free Dynamic Range (SFDR)
Spurious free dynamic range is the peak harmonic or spuri-
ous noise that is the largest spectral component excluding
the input signal and DC. This value is expressed in decibels
relative to the RMS value of a full scale input signal.
Input Bandwidth
The input bandwidth is that input frequency at which the
amplitude of the reconstructed fundamental is reduced
by 3dB for a full scale input signal.
Aperture Delay Time
The time from when CLK reaches mid-supply to the
instant that the input signal is held by the sample and
hold circuit.
Aperture Delay Jitter
The variation in the aperture delay time from conversion
to conversion. This random variation will result in noise
when sampling an AC input. The signal to noise ratio due
to the jitter alone will be:
SNRJITTER = –20log (2π fIN tJITTER)
CONVERTER OPERATION
As shown in Figure 1, the LTC2246H is a CMOS pipelined
multistep converter. The converter has six pipelined ADC
stages; a sampled analog input will result in a digitized
value ve cycles later (see the Timing Diagram section).
For optimal AC performance the analog inputs should be
driven differentially. For cost sensitive applications, the
analog inputs can be driven single-ended with slightly
worse harmonic distortion. The CLK input is single-ended.
The LTC2246H has two phases of operation, determined
by the state of the CLK input pin.
Each pipelined stage shown in Figure 1 contains an ADC,
a reconstruction DAC and an interstage residue amplier.
In operation, the ADC quantizes the input to the stage and
the quantized value is subtracted from the input by the
DAC to produce a residue. The residue is amplied and
相关PDF资料 |
PDF描述 |
|---|---|
| LTC2246HLU | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 |
| LTC2246IUH | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC32 |
| LTC2246IUH#TR | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC32 |
| LTC2257CUJ-12#TRPBF | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC40 |
| LTC2256CUJ-12#PBF | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC40 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2246HLX | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 25Msps 125°C ADC In LQFP |
| LTC2246HLX#PBF | 功能描述:IC ADC 14BIT 25MSPS 48-LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| LTC2246HLX-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 25Msps 125°C ADC In LQFP |
| LTC2246HLX-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 25Msps 125°C ADC In LQFP |
| LTC2246HLX-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 25Msps 125°C ADC In LQFP |
发布紧急采购，3分钟左右您将得到回复。