LTC1197 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1197' PDF : 28 Pages View PDF
LTC1197/LTC1197L
LTC1199/LTC1199L
TYPICAL APPLICATIO S
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). VREF is tied to VCC. VIN is applied to the +IN input and
the – IN input is tied to the ground. CS is driven at 1/16
the clock rate by the 74HC161 and DOUT outputs the data.
The output data from the DOUT pin can be viewed on an
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 DOUT the output
goes midway between VCC and ground when in the high
impedance mode.
1µF
5V
+
10k
CS
VCC
VIN
+ IN
CLK
LTC1197
– IN
DOUT
GND
VREF
CLR
VCC
5V
CLK
RC
A
QA
B 74HC161QB
C
QC
D
QD
P
T
GND LOAD
10k
CLK IN 7.2MHz MAX
DOUT CLK CS
TO OSCILLOSCOPE
1197/99 F11
Figure 11. “Quick Look” Circuit for the LTC1197
CS
CLK
DOUT
HIGH
2 NULL MSB
IMPEDANCE BITS (B9)
LSB FILL
(B0) ZEROES
VERTICAL: 5V/DIV
HORIZONTAL: 10µs/DIV
Figure 12. Scope Photo of the LTC1197 “Quick Look” Circuit
Waveforms Showing A/D Output 1001001001 (249HEX)
24
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