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参数资料
| 型号： | LTC2450IDC-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT DELTA SIG 6-DFN |
| 标准包装： | 2,500 |
| 位数： | 16 |
| 采样率（每秒）： | 30 |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 1.05mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x2） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个单端，单极 |
| 配用： | DC1067A-B-ND - BOARD DELTA SIGMA ADC LTC2450-1 DC1067A-A-ND - BOARD DELTA SIGMA ADC LTC2450 |
LTC2450-1
17
24501fc
APPLICATIONS INFORMATION
noise contribution of the external drive circuit would be
Vn = ni √π/2 Fi. Then, the total system noise level can
be estimated as the square root of the sum of (Vn2) and
the square of the LTC2450-1 noise oor (≈2
μV2).
Aliasing
The LTC2450-1 signal acquisition circuit is a sampled
data system and as such suffers from input signal alias-
ing. As can be seen from Figure 19, due to the very high
over-sample ratios the high frequency input signal attenu-
ation is reasonably good. Nevertheless a continuous time
antialiasing lter connected at the input will preserve
the converter accuracy when the input signal includes
undesirable high frequency components. The antialias-
ing function can be accomplished using the RS and CIN
components shown in Figure 15 sized such that
τ = RS
CIN > 450ns.
Figure 18. Input Signal Attenuation vs Frequency
(Low Frequencies)
Figure 19. Input Signal Attenuation vs Frequency
Signal Bandwidth and Noise Equivalent Input
Bandwidth
The LTC2450-1 includes a sinc1 type digital lter with the
rst notch located at f0 = 60Hz. As such the 3dB input
signal bandwidth is 26.54Hz. The calculated LTC2450-1
input signal attenuation with frequency at low frequencies
is shown in Figure 18.
The LTC2450-1 input signal attenuation with frequency
over a wide frequency range is shown in Figure 19.
The converter noise level is about 1.4μVRMS and can be
modeled by a white noise source connected at the input
of a noise free converter.
For a simple system noise analysis the VIN drive circuit can
be modeled as a single pole equivalent circuit character-
ized by a pole location Fi and a noise spectral density ni.
If the converter has an unlimited bandwidth or at least
a bandwidth substantially larger than Fi, then the total
INPUT SIGNAL FREQUENCY (Hz)
0
INPUT
SIGNAL
A
TTENUA
TIOIN
(dB)
–20
–10
0
480
24501 F18
–30
–40
–25
–15
–5
–35
–45
–50
120
60
240
180
360 420
540
300
600
INPUT SIGNAL FREQUENCY (MHz)
0
INPUT
SIGNAL
A
TTENUA
TION
(dB)
–40
0
10.0
12.5
15.0
24501 F19
–60
–80
–20
–100
2.5
5.0
7.5
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