參數(shù)資料
型號(hào): LTC2392CUK-16#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: SUCCESSIVE APPROXIMATION ADC, PQCC48
封裝: 7 X 7 MM, LEAD FREE, PLASTIC, MO-220WKKD-2, QFN-48
文件頁(yè)數(shù): 5/24頁(yè)
文件大?。?/td> 285K
代理商: LTC2392CUK-16#TRPBF
LTC2392-16
239216f
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 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
相關(guān)PDF資料
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