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LT1469 Fiches technique(PDF) 28 Page - Linear Technology

No de pièce LT1469
Description  18-Bit, 1Msps 8-Channel Differential 짹10.24V Input SoftSpan ADC with Wide Input Common Mode Range
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LT1469 Fiches technique(HTML) 28 Page - Linear Technology

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LTC2335-18
28
233518f
For more information www.linear.com/LTC2335-18
conversions following an idle period. Figure 12 compares
the burst conversion response of the LTC2335-18 with an
input near full scale for two reference configurations. The
first configuration employs the internal reference buffer
with REFIN externally overdriven by an LTC6655-2.048,
while the second configuration disables the internal ref-
erence buffer and overdrives REFBUF with an external
LTC6655-4.096. In both cases REFBUF is bypassed to
GND with a 47µF ceramic capacitor.
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 13 shows
that the LTC2335-18 achieves a typical SNR of 96.9dB in
the ±10.24V range at a 1Msps sampling rate with a true
bipolar 2kHz input signal.
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...VN2
V1
where V1 is the RMS amplitude of the fundamental fre-
quencyandV2throughVNaretheamplitudesofthesecond
throughNthharmonics,respectively.Figure13showsthat
the LTC2335-18 achieves a typical THD of –109dB (N = 6)
in the ±10.24V range at a 1Msps sampling rate with a true
bipolar 2kHz input signal.
applicaTions inForMaTion
Figure 13. 32k Point FFT fSMPL = 1Msps, fIN = 2kHz
Figure 12. Burst Conversion Response of the
LTC2335-18, fSMPL = 1Msps 
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 LTC2335-18 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 below half the sampling frequency, exclud-
ing DC. Figure 13 shows that the LTC2335-18 achieves a
typical SINAD of 96.7dB in the ±10.24V range at a 1Msps
sampling rate with a true bipolar 2kHz input signal.
EXTERNAL REFERENCE ON REFBUF
INTERNAL REFERENCE BUFFER
±10.24V RANGE
IN+ = 10V
IN= 0V
TIME (µs)
0
100
200
300
400
500
–5
0
5
10
15
233518 F12
±10.24V RANGE
TRUE BIPOLAR DRIVE (IN= 0V)
SNR = 96.9dB
THD = –109dB
SINAD = 96.7dB
SFDR = 111dB
FREQUENCY (kHz)
0
100
200
300
400
500
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
233518 F13


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