TYPICAL APPLICATIONS N U Using" />
參數(shù)資料
型號: LTC1594CS
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 4CH 16SOIC
標(biāo)準(zhǔn)包裝: 50
位數(shù): 12
采樣率(每秒): 16.8k
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): 1.6mW
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: 16-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC
包裝: 管件
輸入數(shù)目和類型: 8 個(gè)單端,單極
22
LTC1594/LTC1598
15948fb
TYPICAL APPLICATIONS N
U
Using MUXOUT/ADCIN Loop as PGA
This figure shows the LTC1598’s MUXOUT/ADCIN loop
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 LTC1594, 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 loop
gain for this amplifier is RS1/RS2 + 1. RS1 is the summation
of the resistors above the selected MUX channel and RS2
Using the MUXOUT/ADCIN Loop of the LTC1598 to Form a PGA with Eight Gains in a Noninverting Configuration
is the summation of the resistors below the selected MUX
channel. If CH0 is selected, the loop 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
μFloadcapacitors.Thesecapacitorsprovidefrequency
compensation for the amplifiers, help reduce the amplifi-
ers’ 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 loop gain given
by the formula above.
1594/98 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
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
5V
1
mF
ADCIN
17
16
15, 19
1
mF
0.1
mF
5V
1
mF
5V
VREF VCC
+
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V+
D
V–
DOUT
DIN
CS
CLK
GND
1/2 LT1368
LTC1598
mP/mC
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