LTC1040CSW#TR Linear Technology, LTC1040CSW#TR Datasheet - Page 10

• Manufacturer Part Number: LTC1040CSW#TR
• Description: IC COMPARATOR DUAL LOWPWR 18SOIC
• Manufacturer: Linear Technology
• Series: LTCMOS™r
• Type: General Purposer

Specifications of LTC1040CSW#TR

• Number Of Elements: 2
• Output Type: CMOS, TTL
• Voltage - Supply: 2.8 V ~ 16 V, ±2.8 V ~ 8 V
• Mounting Type: Surface Mount
• Package / Case: 18-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1040
TYPICAL APPLICATIO S
The LTC1040 as a Linear Amplifier
With a simple RC filter, the LTC1040 can be made to
function as a linear amplifier. By filtering the logic output
and feeding it back to the negative input, the loop forces
the output duty cycle [t
V
The RC time constant is set to keep the ripple on the output
small. The maximum output ripple is: V = V
10
IN
(Figure 10).
V
IN
LT1019-5
+
–
+
–
1/2 LTC1040
ON
V
+
/(t
ON
2-Wire 0 C to 100 C Temperature Transducer with 4mA to 20mA Output
6
4
+ t
†
YELLOW SPRINGS INSTRUMENT
R
OFF
U
)] so that V
PART NO. 44201
C
Figure 10. The LTC1040 as a Linear Amplifier
6250
3200
†
ACCURACY =
LTC1040 • TA07
V
+
OUT
OUT
/f
†
S
RC and
equals
18k
CIRCUIT ERROR
AT 25 C
0.1 C
1k
ZERO
ADJUST
6
5
7
8
LM134
–
+
–
+
should be set to 0.5mV to 1mV for best results. Notice that
the higher the sampling frequency, f
This is important because the RC filter also sets the loop
response. A convenient way to keep f
under all conditions is to connect a 100k resistor to pin 16
(OSC) with no capacitance to ground.
+
LTC1040
0V
16
10
V
1/2
TRANSDUCER
100k
+
V
V
ERROR
+
–
0.2 C
9
18
1N914
4 1M
10 F
43
R
= 0.3 C
+
+
t
FULL-SCALE
ON
430
ADJUST
1 F
t
OFF
5k
2N6657
50
182
12V TO 40V
0 C = 4mA
100 C = 20mA
RETURN
LTC1040 • TA09
S
, the lower RC can be.
S
as high as possible
V
OUT
= V +
t
LTC1040 • TA08
ON
t
ON
+ t
OFF
1040fa