參數(shù)資料
型號: LTC1290DCSW
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: Single Chip 12-Bit Data Acquisition System
中文描述: 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝: 0.300 INCH, PLASTIC, SOP-20
文件頁數(shù): 23/28頁
文件大?。?/td> 381K
代理商: LTC1290DCSW
23
LTC 1290
U
S
A
O
PPLICATI
U
U
FREQUENCY (kHz)
0
8
12
16
20
4
24
M
1290 F17a
0
–20
–40
–60
–80
–100
–120
–140
f
IN
= 1kHz
f
= 50.6kHz
SNR = 73.25dB
Figure 17a. LTC1290 FFT Plot
FREQUENCY (kHz)
0
8
12
16
20
4
24
M
1290 F17b
0
–20
–40
–60
–80
–100
–120
–140
f
IN
= 25kHz
f
= 50.6kHz
SNR = 72.54dB
Figure 17b. LTC1290 FFT Plot
FREQUENCY (kHz)
0
E
80
1290 F18
20
40
100
12
11.6
11.2
10.8
10.4
10
9.6
9.2
8.8
60
f
SAMPLE
= 50.6kHz
Figure 18. LTC1290 ENOB vs Input Frequency
Figure 19. LTC1290 FFT Plot
FREQUENCY (kHz)
0
8
12
16
20
4
24
M
1290 F19
0
–20
–40
–60
–80
–100
–120
f
IN1
= 5.1kHz
f
IN2
= 5.6kHz
f
SAMPLE
= 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
22
μ
F
1290 F20
DGND
V
AGND
V
CC
1k
LTC1290
CH0
V
IN
–5V
0.1
μ
F
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