参数资料
型号: LTC2392ILX-16#PBF
厂商: Linear Technology
文件页数: 6/26页
文件大小: 0K
描述: IC ADC 16B SER/PAR 500K 48LQFP
标准包装: 250
位数: 16
采样率(每秒): 500k
数据接口: 串行,并联
转换器数目: 1
功率耗散(最大): 135mW
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-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 托盘
输入数目和类型: 1 个差分,双极
配用: DC1500A-B-ND - BOARD SAR ADC LTC2392-16
LTC2392-16
14
239216fa
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
internalreferencebufferisabout85kΩ.Itisrecommended
that this node be bypassed to ground with a 1F 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 LTC2392-16
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 LTC2392-16 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 LTC2392-16 achieves
a typical SINAD of 93.5dB at a 500kHz sampling rate with
a 20kHz input.
Figure 5. 16k Point FFT of the LTC2392-16, fS = 500ksps, fIN = 20kHz
FREQUENCY (kHz)
0
–180
AMPLITUDE
(dBFS)
–160
–120
–100
–80
50
100
250
150
200
0
239216 G08
–140
–60
–40
–20
SNR = 94dB
THD
= –103dB
SINAD = 93.5dB
SFDR = 104dB
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