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LTC1290BCSW データシート(PDF) 23 Page - Linear Technology

部品番号 LTC1290BCSW
部品情報  Single Chip 12-Bit Data Acquisition System
PDF  28 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LTC1290BCSW データシート(HTML) 23 Page - Linear Technology

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LTC1290
S
APPLICATI
I FOR ATIO
FREQUENCY (kHz)
0
8
12
16
20
424
1290 • F17a
0
–20
–40
–60
–80
–100
–120
–140
fIN = 1kHz
fSAMPLE = 50.6kHz
SNR = 73.25dB
Figure 17a. LTC1290 FFT Plot
FREQUENCY (kHz)
0
8
12
16
20
424
1290 • F17b
0
–20
–40
–60
–80
–100
–120
–140
fIN = 25kHz
fSAMPLE = 50.6kHz
SNR = 72.54dB
Figure 17b. LTC1290 FFT Plot
FREQUENCY (kHz)
0
80
1290 F18
20
40
100
12
11.6
11.2
10.8
10.4
10
9.6
9.2
8.8
60
fSAMPLE = 50.6kHz
Figure 18. LTC1290 ENOB vs Input Frequency
Figure 19. LTC1290 FFT Plot
FREQUENCY (kHz)
0
8
12
16
20
424
1290 • F19
0
–20
–40
–60
–80
–100
–120
fIN1 = 5.1kHz
fIN2 = 5.6kHz
fSAMPLE = 50.6kHz
fundamentals. This is classically referred to as
intermodulation distortion (IMD).
8. Overvoltage Protection
Applying signals to the analog MUX that exceed the
positive or negative supply of the device will degrade the
accuracy of the A/D and possibly damage the device. For
example this condition would occur if a signal is applied to
the analog MUX before power is applied to the LTC1290.
Another example is the input source is operating from
different supplies of larger value than the LTC1290. These
conditions should be prevented either with proper supply
sequencing or by use of external circuitry to clamp or
current limit the input source. As shown in Figure 20, a 1k
resistor is enough to stand off
±15V (15mA for one only
channel). If more than one channel exceeds the supplies
then the following guidelines can be used. Limit the
current to 7mA per channel and 28mA for all channels.
This means four channels can handle 7mA of input current
each. Reducing the ACLK and SCLK frequencies from the
maximum of 4MHz and 2MHz, respectively, (see Typical
Peformance Characteristics curves Maximum ACLK Fre-
quency vs Source Resistance and Sample-and-Hold
Acquisition Time vs Source Resistance) allows the use of
Figure 20. Overvoltage Protection for MUX
5V
1290 F20
DGND
V–
AGND
VCC
1k
LTC1290
CH0
VIN
–5V
0.1
µF
22
µF



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