LTC1287 LINER [Linear Technology], LTC1287 Datasheet - Page 15

• Manufacturer Part Number: LTC1287
• Description: 3V Single Chip 12-Bit Data Acquisition System
• Manufacturer: LINER [Linear Technology]

A
PPLICATI
V
IN
O
U
CS
+IN
–IN
GND
S
LTC1287
Figure 18
I FOR ATIO
D
U
V
CLK
V
OUT
CS
+IN
–IN
GND
REF
TO OSCILLOSCOPE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
CC
LTC1287
Figure 20. Scope Trace of the LTC1287 “Quick Look” Circuit
Showing A/D Output 1010101010 (AAA
22 F TANTALUM
D
D
CLK
V
OUT
CLK
V
CS
W
OUT
REF
CC
Figure 19. "Quick Look" Circuit for the LTC1287
1N4148
LTC1287 F18
+2.5V
+3V
NULL
BIT
f
U
(B11)
MSB
VERTICAL: 5V/DIV
HORIZONTAL: 5 s/DIV
f/32
A “Quick Look” Circuit for the LTC1287
Users can get a quick look at the function and timing of
the LTC1287 by using the following simple circuit
(Figure 19). V
input and the –IN input is tied to the ground plane. CS
is driven at 1/32 the clock rate by the 74HC393 and D
outputs the data. The output data from the D
be viewed on an oscilloscope that is set up to trigger on
the falling edge of CS (Figure 20). Note the LSB data is
partially clocked out before CS goes high.
(B0)
LSB
CLOCK IN
500kHz
LSB DATA
A1
CLR1
1QA
1QB
1QC
1QD
GND
HEX
(B1)
)
74HC393
REF
CLR2
VCC
2QA
2QB
2QC
2QD
is tied to V
A2
CC
. V
+3V
LTC1287 F19
IN
is applied to the +IN
0.1µF
LTC1287
OUT
15
pin can
OUT