TYPICAL APPLICATIONS N U Us" />
參數(shù)資料
型號: LTC1598LCG
廠商: Linear Technology
文件頁數(shù): 15/24頁
文件大?。?/td> 0K
描述: IC A/D CONV 12BIT SRL 8CH 24SSOP
標(biāo)準(zhǔn)包裝: 59
位數(shù): 12
采樣率(每秒): 10.5k
數(shù)據(jù)接口: MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 480µW
電壓電源: 單電源
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 24-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 24-SSOP
包裝: 管件
輸入數(shù)目和類型: 8 個單端,單極
22
LTC1594L/LTC1598L
15948lfb
TYPICAL APPLICATIONS N
U
Using MUXOUT/ADCIN Loop as PGA
This figure shows the LTC1598L’s MUXOUT/ADCIN pins
and an LT1368 being used to create a single channel PGA
with eight noninverting gains. Combined with the LTC1391,
the system can expand to eight channels and eight gains
for each channel. Using the LTC1594L, the PGA is reduced
to four gains. The output of the LT1368 drives the ADCIN
and the resistor ladder. The resistors above the selected
MUX channel form the feedback for the LT1368. The gain
for this amplifier is RS1/RS2 + 1. RS1 is the summation of
the resistors above the selected MUX channel and RS2 is
Using the MUXOUT/ADCIN Pins of the LTC1598L to Form a PGA.
The LTC1391 MUX Allows Eight Input Channels to be Digitized
the summation of the resistors below the selected MUX
channel. If CH0 is selected, the gain is 1 since RS1 is 0.
Table 1 shows the gain for each MUX channel. The LT1368
dual rail-to-rail op amp is designed to operate with 0.1
F
load capacitors. These capacitors provide frequency com-
pensation for the amplifiers, help reduce the amplifiers’
output impedance and improve supply rejection at high
frequencies. Because the LT1368’s IB is low, the RON of the
selected channel will not affect the gain given by the
formula above.
1594L/98L TA06
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
20
21
22
23
24
1
2
3
64R
32R
16R
8R
4R
2R
R
+
8
COM
18
MUXOUT
= DAISY CHAIN CONFIGURATION FOR THE LTC1391 AND THE LTC1598L
GND
4, 9
10
6
5, 14
11
7
CSADC
CSMUX
CLK
DOUT
DIN
12
13
NC
12-BIT
SAMPLING
ADC
8-CHANNEL
MUX
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1391
3V
1
F
ADCIN
17
16
15, 19
1
F
0.1
F
3V
1
F
3V
VREF VCC
+
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V+
D
V–
DOUT
DIN
CS
CLK
GND
1/2 LT1368
LTC1598L
P/C
3(5)
2(6)
1(7)
4
8
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