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参数资料
| 型号： | LTC2393IUK-16#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT SER/PAR 1M 48-QFN |
| 标准包装： | 2,000 |
| 位数： | 16 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 175mW |
| 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-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN-EP（7x7） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | DC1500A-A-ND - BOARD SAR ADC LTC2393-16 |
LTC2393-16
13
239316fa
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 filter the output noise of the internal reference.
The REFSENSE pin should be left floating when using the
internal reference.
External Reference
An external reference can be used with the LTC2393-16
when even higher performance is required. The
LT1790-4.096 offers 0.05% (max) initial accuracy and
10ppm/°C (max) temperature coefficient. 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 LTC2393-16 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 LTC2393-16 achieves
a typical SINAD of 93.9dB at a 1MHz sampling rate with
a 20kHz input.
Figure 5. 16k Point FFT of the LTC2393-16, fS = 1Msps, fIN = 20kHz
FREQUENCY (kHz)
0
–180
AMPLITUDE
(dBFS)
–160
–120
–100
–80
200
400
500
0
239316 G08
–140
100
300
–60
–40
–20
SNR = 94.2dB
THD
–105dB
SINAD = 93.9dB
SFDR = 108dB
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