参数资料
型号: LTC1290CISW#TRPBF
厂商: Linear Technology
文件页数: 18/32页
文件大小: 0K
描述: IC DATA ACQ SYS 12BIT 20-SOIC
标准包装: 1,000
类型: 数据采集系统(DAS),ADC
分辨率(位): 12 b
采样率(每秒): 50k
数据接口: 串行,并联
电压电源: 双 ±
电源电压: ±5 V,5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-SOIC(0.295",7.50mm 宽)
供应商设备封装: 20-SOIC
包装: 带卷 (TR)
25
LTC1290
1290fe
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
How the various power supplies to the LTC1290 are
applied can also lead to overvoltage conditions. For single
supply operation (i.e., unipolar mode), if VCC and REF+ are
not tied together, then VCC should be turned on first, then
REF+. If this sequence cannot be met, connecting a diode
from REF+ to VCC is recommended (see Figure 21).
For dual supplies (bipolar mode) placing two Schottky
diodes from VCC and Vto ground (Figure 23) will prevent
power supply reversal from occurring when an input
source is applied to the analog MUX before power is
applied to the device. Power supply reversal occurs, for
example, if the input is pulled below Vthen VCC will pull
a diode drop below ground which could cause the device
not to power up properly. Likewise, if the input is pulled
above VCC then Vwill be pulled a diode drop above
ground. If no inputs are present on the MUX, the Schottky
diodes are not required if Vis applied first, then VCC.
Because a unique input protection structure is used on the
digital input pins, the signal levels on these pins can
exceed the device VCC without damaging the device.
5V
1290 F21
REF+
VCC
LTC1290
22
F
1N4148
VREF
14
20
5V
1290 F22
DGND
V
AGND
VCC
LTC1290
–5V
0.1
F
22
F
1N5817
Figure 21
Figure 22. Power Supply Reversal
Figure 20. Overvoltage Protection for MUX
5V
1290 F20
DGND
V
AGND
VCC
1k
LTC1290
CH0
VIN
–5V
0.1
F
22
F
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