参数资料
型号: LTC6360CDD#PBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO8
封装: 3 X 3 MM, LEAD FREE, PLASTIC, M0-229WEED-1, DFN-8
文件页数: 13/24页
文件大小: 514K
代理商: LTC6360CDD#PBF
LTC6360
20
6360f
applicaTions inForMaTion
Interfacing to High Voltage Signals
Using the amplifier in the inverting configuration, with a
fixed input common mode voltage, allows the input signal
to traverse a swing beyond the LTC6360 supply rails.
A practical application for the inverting gain configuration
is translating a high voltage signal to a range suitable for
a low voltage SAR ADC. For a clean interface, two condi-
tions must be met:
1. The gain is selected so that full-scale signals at HVIN
are translated at the output of the LTC6360 to the ap-
propriate full-scale range for the ADC.
2. VOUT = VFS/2 when HVIN is centered at HVNOM, where
VFS is the ADC full-scale input voltage and HVNOM is
the average level of the input voltage.
Figure 12. Interfacing a ±10V Input Signal to a 5V ADC
Applying the above constraints to the design equations
gives values for RF/RG and V1:
RF /RG =
VOUT(MAX)– VOUT(MIN)
[
]
HVIN(MAX)–HVIN(MIN)
[
]
(9)
V1 = [VFS/2 + RF/RG HVNOM]/(1 + RF/RG)
(10)
Applying these formulas to the case where ±10V input
signal is to be translated to a 0V to 4V full-scale range
yields the values shown in Figure 12.
Figure 13. Low Noise, True Zero 1MΩ DC Precise Photodiode
Transimpedance Amplifier
5V
V1
1.67V
10
10pF
2k
10k
0.1F
5V
6360 F12
CPO
VDD
GND
LTC6360
OUT
–IN
VCC
VOUT
HVIN
CPI
SHDN
+IN
+
CHARGE
PUMP
0.1F
10F
330pF
+–
1.67k
10V
–10V
0V
4V
0V
2V
0.1F
1F
6360 F13
R6
1k
U3
LTC2054
5V
C5
0.1F
C6
0.1F
R2
1k
J1 NXP
BF862
+
U1
5V
R1
1M
10k
IPD
R5
2k
5V
R3
10M
SFH213
PHOTODIODE
CPI
C1
50fF (PARASITIC)
C4
0.1F
1F
CPO CPI
+
LTC6360
CPO
CPI
10F
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