LTC1096 Linear Technology, LTC1096 Datasheet - Page 25

• Manufacturer Part Number: LTC1096
• Description: Micropower Sampling 8-Bit Serial I/O A/D Converters
• Manufacturer: Linear Technology

A “Quick Look” Circuit for the LTC1096
Users can get a quick look at the function and timing of the
LT1096 by using the following simple circuit (Figure 13).
V
– IN input is tied to the ground. CS is driven at 1/16 the
clock rate by the 74C161 and D
output data from the D
oscilloscope that is set up to trigger on the falling edge of
CS (Figure 14). Note the LSB data is partially clocked out
before CS goes high.
V
Figure 15 shows a temperature measurement system.
The LTC1096 is connected directly to the low cost silicon
temperature sensor. The voltage applied to the V
adjusts the full scale of the A/D to the output range of the
sensor. The zero point of the converter is matched to the
zero output voltage of the sensor by the voltage on the
LTC1096’s negative input.
TYPICAL
IN
REF
is tied to V
CS
CH0
CH1
GND
Figure 13. “Quick Look” Circuit for the LTC1096
LTC1096
4.7 F
A
D
V
CC
CLK
+
V
OUT
REF
CC
PPLICATI
. V
5V
IN
TO OSCILLOSCOPE
is applied to the +IN input and the
OUT
pin can be viewed on an
OUT
O
CLOCK IN 150kHz MAX
U
outputs the data. The
CLR
CLK
A
B
C
D
P
GND
S
74C161
LOAD
V
CC
RC
QA
QB
QC
QD
T
REF
LTC1096/8 • F13
pin
5V
678
Figure 15. The LTC1096’s High Impedance Input Connects
Directly to This Temperature Sensor, Eliminating Signal
Conditioning Circuitry in This 0 C to 70 C Thermometer
Figure 14. Scope Trace the LTC1096 “Quick Look” Circuit
Showing A/D Output 10101010 (AA
D
13.5k
CLK
OUT
LM134
CS
0.01 F
NULL
BIT
75k
LT1004-1.2
182k
MSB
(B7)
VERTICAL: 5V/DIV
HORIZONTAL: 10 s/DIV
LTC1096/LTC1096L
LTC1098/LTC1098L
0.01 F
(B0)
LSB
63.4k
HEX
+IN
–IN
V
REF
LSB DATA
)
(B1)
LTC1096
GND
V
3V
CC
D
CLK
OUT
CS
LTC1096/8 • F15
25
TO P
0.1 F