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LTC2327-18 数据表(PDF) 15 Page - Linear Technology

部件名 LTC2327-18
功能描述  True Bipolar, Pseudo-Differential Input ADC with 95dB SNR
Download  26 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2327-18 数据表(HTML) 15 Page - Linear Technology

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LTC2327-18
15
232718fa
For more information www.linear.com/LTC2327-18
applicaTions inForMaTion
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 LTC2327-18 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 8 shows that the LTC2327-18 achieves
a typical SINAD of 95dB at a 500kHz sampling rate with
a 2kHz input.
Signal-to-Noise Ratio (SNR)
The signal-to-noise ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency and
the RMS amplitude of all other frequency components
except the first five harmonics and DC. Figure 8 shows
that the LTC2327-18 achieves a typical SNR of 95dB at a
500kHz sampling rate with a 2kHz input.
Total Harmonic Distortion (THD)
TotalHarmonicDistortion(THD)istheratiooftheRMSsum
ofallharmonicsoftheinputsignaltothefundamentalitself.
The out-of-band harmonics alias into the frequency band
between DC and half the sampling frequency (fSMPL/2).
THD is expressed as:
THD=20log
V22 +V32 +V42 +…+VN
2
V1
where V1 is the RMS amplitude of the fundamental
frequency and V2 through VN are the amplitudes of the
second through Nth harmonics.
POwER CONSIDERATIONS
The LTC2327-18 provides two power supply pins: the 5V
power supply (VDD), and the digital input/output interface
power supply (OVDD). The flexible OVDD supply allows
the LTC2327-18 to communicate with any digital logic
operating between 1.8V and 5V, including 2.5V and 3.3V
systems.
Power Supply Sequencing
The LTC2327-18 does not have any specific power supply
sequencing requirements. Care should be taken to adhere
to the maximum voltage relationships described in the
Absolute Maximum Ratings section. The LTC2327-18
has a power-on reset (POR) circuit that will reset the
LTC2327-18 at initial power-up or whenever the power
supply voltage drops below 2V. Once the supply voltage
reenters the nominal supply voltage range, the POR will
re-initialize the ADC. No conversions should be initiated
until 200μs after a POR event to ensure the re-initialization
period has ended. Any conversions initiated before this
time will produce invalid results.
TIMING AND CONTROL
CNV Timing
The LTC2327-18 conversion is controlled by CNV. A ris-
ing edge on CNV will start a conversion and power up
the LTC2327-18. Once a conversion has been initiated,
Figure 8. 32k Point FFT of the LTC2327-18
FREQUENCY (kHz)
–180
–60
–40
–20
–80
–100
–120
–140
–160
0
232718 F08
SNR = 95.3dB
THD = –113dB
SINAD = 95.2dB
SFDR = –116dB
0
50
100
150
250
200


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