LTC1096AI(RevB) 데이터 시트보기 (PDF) - Linear Technology
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LTC1096AI Datasheet PDF : 28 Pages
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TYPICAL APPLICATI S
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).
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 74C161 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 14). Note the LSB data is partially clocked out
before CS goes high.
4.7µF 5V
+
CS
VCC
VIN
CH0
CLK
LTC1096
CH1
DOUT
GND
VREF
CLR
VCC
5V
CLK
RC
A
QA
B 74C161 QB
C
QC
D
QD
P
T
GND LOAD
CLOCK IN 150kHz MAX
TO OSCILLOSCOPE
LTC1096/8 • F13
Figure 13. “Quick Look” Circuit for the LTC1096
Figure 15 shows a temperature measurement system.
The LTC1096 is connected directly to the low cost silicon
temperature sensor. The voltage applied to the VREF pin
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.
LTC1096/LTC1096L
LTC1098/LTC1098L
CS
CLK
DOUT
NULL
BIT
MSB
LSB LSB DATA
(B7)
(B0) (B1)
VERTICAL: 5V/DIV
HORIZONTAL: 10µs/DIV
Figure 14. Scope Trace the LTC1096 “Quick Look” Circuit
Showing A/D Output 10101010 (AAHEX)
3V
LM134
75k
678Ω
13.5k
182k
0.01µF
LT1004-1.2
0.01µF
VCC
+IN
CS
–IN LTC1096 CLK
VREF
DOUT
GND
63.4k
0.1µF
TO µP
LTC1096/8 • F15
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
25
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