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| LTC1297_15 Datasheet, PDF (21/24 Pages) Linear Technology – Single Chip 12-Bit Data Acquisition Systems | |||
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LTC1292/LTC1297
APPLICATI S I FOR ATIO
If VCC and VREF are not tied together, then VCC should
be turned on first, then VREF. If this sequence cannot be
met, connecting a diode from VREF to VCC is recom-
mended (see Figure 25).
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.
1N4148 DIODES
CS
VCC
+IN
CLK
LTC1292
LTC1297
âIN
DOUT
GND
VREF
5V
LTC1292/7 F23
Figure 23. Overvoltage Protection with Clamp Diodes
1N4148 DIODES
CS
VCC
1k
+IN
CLK
LTC1292
LTC1297
âIN
DOUT
GND
VREF
5V
LTC1292/7 F24
Figure 24b. Overvoltage Protection with
Diode Clamps and Current Limiting Resistor
1k
250â¦
CS
VCC
+IN
CLK
LTC1292
LTC1297
âIN
DOUT
GND
VREF
5V
LTC1292/7 F24a
Figure 24a. Overvoltage Protection with
Current Limiting Resistors
CS
VCC
5V
+IN
CLK
LTC1292
LTC1297
âIN
DOUT
1N4148
GND
VREF
5V
LTC1292/7 F25
Figure 25. Separate VCC and VREF Supplies
22µF
CS
VCC
VIN
+IN
CLK
LTC1292
âIN
DOUT
GND
VREF
TO OSCILLOSCOPE
+5V
f/32
CLOCK IN
1MHz
CLK
VDD
EN
RESET
Q1
Q4
Q2
Q3
CD4520
Q3
Q2
Q4
Q1
RESET
EN
VSS
CLK
0.1µF
LTC1292/7 F26
Figure 26. âQuick Lookâ Circuit for the LTC1292
12927fb
21
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