LTC1292 LINER [Linear Technology], LTC1292 Datasheet - Page 21

• Manufacturer Part Number: LTC1292
• Description: Single Chip 12-Bit Data Acquisition Systems
• Manufacturer: LINER [Linear Technology]

A
If V
be turned on first, then V
met, connecting a diode from V
mended (see Figure 25).
PPLICATI
CC
Figure 23. Overvoltage Protection with Clamp Diodes
and V
V
IN
1N4148 DIODES
REF
Figure 24a. Overvoltage Protection with
Current Limiting Resistors
250
1k
O
are not tied together, then V
U
S
CS
+IN
–IN
GND
CS
+IN
–IN
GND
TO OSCILLOSCOPE
REF
I FOR ATIO
LTC1292
LTC1297
LTC1292
CS
+IN
–IN
GND
U
. If this sequence cannot be
LTC1292
LTC1297
D
D
V
V
22µF
CLK
V
OUT
CLK
REF
V
OUT
REF
CC
CC
REF
D
V
W
CLK
V
OUT
REF
Figure 26. “Quick Look” Circuit for the LTC1292
CC
to V
LTC1292/7 F24a
5V
CC
LTC1292/7 F23
is recom-
CC
U
5V
should
CLOCK IN
1MHz
f/32
Because a unique input protection structure is used on
the digital input pins, the signal levels on these pins can
exceed the device V
Figure 25. Separate V
Figure 24b. Overvoltage Protection with
Diode Clamps and Current Limiting Resistor
RESET
CLK
EN
Q1
Q2
Q3
Q4
V
1k
SS
1N4148 DIODES
CD4520
CS
+IN
–IN
GND
CC
LTC1292
LTC1297
RESET
CS
+IN
–IN
GND
without damaging the device.
V
CLK
LTC1292/LTC1297
Q4
EN
DD
Q3
Q2
Q1
LTC1292
LTC1297
D
V
CLK
V
OUT
REF
CC
CC
+5V
and V
D
V
CLK
V
OUT
REF
CC
REF
LTC1292/7 F25
1N4148
0.1µF
Supplies
LTC1292/7 F24
LTC1292/7 F26
5V
5V
5V
21