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参数资料
| 型号： | LTC1406IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC A/D CONV 8BIT SAMPLING 24SSOP |
| 标准包装： | 2,500 |
| 位数： | 8 |
| 采样率（每秒）： | 20M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 225mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
9
LTC1406
APPLICATIONS INFORMATION
WU
U
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 the sum and differ-
ence frequencies of mfa ±nfb, where m and n = 0, 1, 2, 3,
etc. For example, the 2nd order IMD terms include (fa ±fb).
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 f
f
Amplitude at
ab
b
±
()=
±
()
20 log
Amplitude at f
f
a
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 decibel relative to the RMS value of
a full-scale input signal (see Figure 6).
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. The LTC1406 has been
designed for wide input bandwidth (250MHz), allowing
the ADC to undersample input signals with frequencies
above the converter’s Nyquist frequency. The noise floor
stays very low at high frequencies; S/(N + D) becomes
dominated by distortion at frequencies far beyond Nyquist.
Analog Inputs
The LTC1406 has a unique differential sample-and-hold
circuit that allows rail-to-rail inputs. The AIN
+ and AIN–
inputs are sampled at the same time and the ADC will
always convert the difference of [(AIN
+) – (AIN–)] indepen-
dent of the common mode voltage. Any unwanted signal
that is common to both inputs will be rejected by the com-
mon mode rejection of the sample-and-hold circuit. The
common mode rejection holds up to extremely high fre-
quencies (see Figure 7).
The inputs can be driven differentially or single-ended. In
differential mode, both inputs are driven
±0.5V out of
phase with each other. In single-ended mode, the nega-
tive input is tied to a fixed voltage and AIN
+ is used as the
Figure 6. Spurious-Free Dynamic Range vs
Input Frequency
INPUT FREQUENCY (Hz)
100k
SPURIOUS-FREE
DYNAMIC
RANGE
(dB)
70
60
50
40
30
20
10
0
1M
10M
100M
1406 G04
INPUT FREQUENCY (Hz)
100k
AMPLITUDE
(dB
BELOW
THE
FUNDAMENTAL)
0
–10
–20
–30
–40
–50
–60
–70
–80
1M
10M
100M
1406 G03
THD
3RD HARMONIC
2ND HARMONIC
Figure 4. Distortion vs Input Frequency
FREQUENCY (MHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
AMPLITUDE
(dB)
1406 G05
0123
4
5
67
8
9
10
fSAMPLE = 20MHz
fIN1 = 3.500977MHz
fIN2 = 3.598633MHz
Figure 5. Intermodulation Distortion Plot
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| LTC1407ACMSE#TR | 功能描述:IC ADC 14BIT 3MSPS SAMPLE 10MSOP 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:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC1407ACMSE#TRPBF | 功能描述:IC ADC 14BIT 3MSPS SAMPLE 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
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