參數(shù)資料
型號： LTC1290CISW#PBF
廠商： Linear Technology
文件頁數(shù)： 17/32頁
文件大?。?/td> 0K
描述： IC DATA ACQ SYS 12BIT 20-SOIC
標準包裝： 38
類型： 數(shù)據(jù)采集系統(tǒng)（DAS），ADC
分辨率（位）： 12 b
采樣率（每秒）： 50k
數(shù)據(jù)接口： 串行，并聯(lián)
電壓電源： 雙 ±
電源電壓： ±5 V，5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 20-SOIC
包裝： 管件
產(chǎn)品目錄頁面： 1346 (CN2011-ZH PDF)
24
LTC1290
1290fe
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
FREQUENCY (kHz)
0
8
12
16
20
424
MAGNITUDE
(dB)
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
MAGNITUDE
(dB)
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
EFFECTIVE
NUMBER
OF
BITS
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
MAGNITUDE
(dB)
1290 F19
0
–20
–40
–60
–80
–100
–120
fIN1 = 5.1kHz
fIN2 = 5.6kHz
fSAMPLE = 50.6kHz
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
Performance Characteristics curves Maximum ACLK Fre-
quency vs Source Resistance and Sample-and-Hold
Acquisition Time vs Source Resistance) allows the use of
larger current limiting resistors. Use 1N4148 diode clamps
from the MUX inputs to VCC and V – if the value of the series
resistor will not allow the maximum clock speeds to be
used or if an unknown source is used to drive the LTC1290
MUX inputs.
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