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LTC1289BCSW Datasheet(PDF) 21 Page - Linear Technology

Part # LTC1289BCSW
Description  3 Volt Single Chip 12-Bit Data Acquisition System
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1289BCSW Datasheet(HTML) 21 Page - Linear Technology

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21
LTC1289
1289fb
output spectrum of the LTC1289 is shown in Figures 17a
and 17b. The input (fIN) frequencies are 1kHz and 12kHz
with the sampling frequency (fS) at 25kHz. The SNR
obtained from the plot are 72.92dB and 72.23dB.
Rewriting the SNR expression it is possible to obtain the
equivalent resolution based on the SNR measurement.
This is the so-called effective number of bits (ENOB). For
the example shown in Figures 17a and 17b, N = 11.8 bits
and 11.7 bits, respectively. Figure 18 shows a plot of ENOB
as a function of input frequency. The curve shows the
A/D’s ENOB remain in the range of 11.8 to 11.7 for input
frequencies up to fS/2
S
APPLICATI
I FOR ATIO
7. LTC1289 AC Characteristics
Two commonly used figures of merit for specifying the
dynamic performance of the A/D’s in digital signal pro-
cessing applications are the Signal-to-Noise Ratio (SNR)
and the “effective number of bits (ENOB).” SNR is defined
as the ratio of the RMS magnitude of the fundamental to
the RMS magnitude of all the nonfundamental signals up
to the Nyquist frequency (half the sampling frequency).
The theoretical maximum SNR for a sine wave input is
given by:
SNR = (6.02N + 1.76dB)
where N is the number of bits. Thus the SNR is a function
of the resolution of the A/D. For an ideal 12-bit A/D the SNR
is equal to 74dB. A Fast Fourier Transform(FFT) plot of the
Figure 17a. fIN = 1kHz, fS = 25kHz, SNR = 72.92dB
Figure 19. fIN1 = 2.6kHz, fIN2 = 3.1kHz, fS = 25kHz
Figure 17b. fIN = 12kHz, fS = 25kHz, SNR = 72.23dB
Figure 18. LTC1289 ENOB vs Input Frequency
FREQUENCY (kHz)
0
6
7
8
9
10
11
12
10
20
30
40
LTC1289 • AIF18
50
fS = 25kHz
SNR – 1.76dB
6.02
N =
FREQUENCY (kHz)
0
–60
–40
0
610
LTC1289 F17a
–80
–100
24
812
14
–120
–140
–20
FREQUENCY (kHz)
0
–60
–40
0
610
LTC1289 F17b
–80
–100
24
812
14
–120
–140
–20
FREQUENCY (kHz)
0
–60
–40
0
610
LTC1289 F19
–80
–100
24
812
14
–120
–140
–20


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