LTC1197 Linear Technology, LTC1197 Datasheet - Page 24

• Manufacturer Part Number: LTC1197
• Description: 10-Bit/ 500ksps ADCs in MSOP with Auto Shutdown
• Manufacturer: Linear Technology

LTC1197/LTC1197L
LTC1199/LTC1199L
A “Quick Look” Circuit for the LTC1197
Users can get a quick look at the function and timing of
the LTC1197 by using the following simple circuit (Figure
11). V
the – IN input is tied to the ground. CS is driven at 1/16
the clock rate by the 74HC161 and D
The output data from the D
24
TYPICAL
REF
is tied to V
A
PPLICATI
CC
. V
IN
is applied to the +IN input and
OUT
V
O
IN
pin can be viewed on an
Figure 12. Scope Photo of the LTC1197 “Quick Look” Circuit
Waveforms Showing A/D Output 1001001001 (249
U
D
CLK
OUT
OUT
CS
CS
+ IN
– IN
GND
S
Figure 11. “Quick Look” Circuit for the LTC1197
IMPEDANCE
outputs the data.
LTC1197
HIGH
1 F
D
V
CLK
+
V
OUT
REF
CC
10k
2 NULL
BITS
VERTICAL: 5V/DIV
HORIZONTAL: 10 s/DIV
TO OSCILLOSCOPE
5V
D
OUT
10k
CLK CS
MSB
(B9)
oscilloscope that is set up to trigger on the falling edge
of CS (Figure 12). Note that after the LSB is clocked out,
the LTC1197 clocks out zeros until CS goes high. Also
note that with the resistor divider on D
goes midway between V
impedance mode.
CLK IN 7.2MHz MAX
CLR
CLK
A
B
C
D
P
GND
LSB
(B0)
74HC161
LOAD
ZEROES
V
FILL
CC
QD
RC
QA
QB
QC
T
HEX
)
1197/99 F11
5V
CC
and ground when in the high
OUT
the output