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参数资料
| 型号： | DC1500A-C |
| 厂商： | Linear Technology |
| 文件页数： | 5/24页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2391-16 |
| 软件下载： | QuikEval II System |
| 设计资源： | DC1500A Design File DC1500A Schematic |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行，并联 |
| 输入范围： | ±4.096 V |
| 在以下条件下的电源（标准）： | 95mW @ 250kSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2391-16 |
| 已供物品： | 板 |
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LTC2391-16
13
239116fa
APPLICATIONS INFORMATION
Internal Reference
To use the internal reference, simply tie the REFOUT and
REFIN pins together. This connects the 4.096V output of
the internal reference to the input of the internal reference
buffer. The output impedance of the internal reference is
approximately 2.6kΩ and the input impedance of the in-
ternal reference buffer is about 85kΩ. It is recommended
that this node be bypassed to ground with a 1μF or larger
capacitor to lter the output noise of the internal reference.
The REFSENSE pin should be left oating when using the
internal reference.
External Reference
An external reference can be used with the LTC2391-16
when even higher performance is required. The
LT1790-4.096 offers 0.05% (max) initial accuracy and
10ppm/°C (max) temperature coefcient. When using an
external reference, connect the reference output to the
REFIN pin and connect the REFOUT pin to ground. The
REFSENSE pin should be connected to the ground of the
external reference.
DYNAMIC PERFORMANCE
Fast fourier transform (FFT) techniques are used to test
the ADC’s frequency response, distortion and noise at the
rated throughput. By applying a low distortion sine wave
and analyzing the digital output using an FFT algorithm,
the ADC’s spectral content can be examined for frequen-
cies outside the fundamental. The LTC2391-16 provides
guaranteed tested limits for both AC distortion and noise
measurements.
Signal-to-Noise and Distortion Ratio (SINAD)
The signal-to-noise and distortion ratio (SINAD) is the
ratio between the RMS amplitude of the fundamental input
frequency and the RMS amplitude of all other frequency
components at the A/D output. The output is band-limited
to frequencies from above DC and below half the sampling
frequency. Figure 5 shows that the LTC2391-16 achieves
a typical SINAD of 93.5dB at a 250ksps sampling rate
with a 20kHz input.
Figure 5. 16k Point FFT of the LTC2391-16, fS = 250ksps, fIN = 20kHz
FREQUENCY (kHz)
0
–180
AMPLITUDE
(dBFS)
–160
–120
–100
–80
50
100
125
0
239116 G08
–140
25
75
–60
–40
–20
SNR = 94dB
THD
–103dB
SINAD = 93.5dB
SFDR = 104dB
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