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LTC1540CMS8 Datasheet(PDF) 12 Page - Linear Technology

Part # LTC1540CMS8
Description  Nanopower Comparator with Reference
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1540CMS8 Datasheet(HTML) 12 Page - Linear Technology

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LTC1540
sn1540 1540fas
LT/TP 0403 1K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1997
TYPICAL APPLICATION
RF Field Detector
Figure 10 shows the complete circuit for a field detector
which was tested at 445MHz. A transmission line is used
to match the detector diode (1N5712) to a quarter-wave
whip antenna. The 0.23λ wavelength transmission line
section transforms the 1pF (350Ω) diode junction capaci-
tance to a virtual short at the base of the antenna. At the
same time it converts the received antenna current to a
voltage loop at the diode, giving excellent sensitivity.
Figure 10. Nanopower Field Detector
+
LTC1540
2V TO 11V
2
1540 F10
10nF
0.23λ
1N5712
10nF
12M
180k
λ /4
10k
FB
7
6
5
8
3
4
1
Q
Q
CMOS
ONE SHOT
(CD4047)
PART NUMBER
DESCRIPTION
COMMENTS
LT
®1178/LT1179
Dual/Quad 17µA Precision Single Supply Op Amps
70µV Max VOS, 5nA Max IBIAS
LT1351
Single 250µA, 3MHz, 200V/µs Op Amp with Shutdown
C-Load
TM Op Amp Stable Driving Any Capacitive Load
LT1352/LT1353
Dual/Quad 250µA, 3MHz, 200V/µs Op Amps
C-Load Op Amps Stable Driving Any Capacitive Load
LTC1440
Micropower Comparator with 1% Reference
1.182V ±1% Reference, ±10mV (Max) Input Offset
LTC1443/LTC1444/LTC1445
Micropower Quad Comparators with 1% Reference
LTC1443 Has 1.182V Reference, LTC1444/LTC1445 Have
1.221V Reference and Adjustable Hysteresis
LTC1474
Low Quiescent Current High Efficiency
10µA Standby Current, 92% Efficiency, Space Saving 8-Pin
Step-Down Converter
MSOP Package
LT1495
1.5µA Max, Dual Precision Rail-to-Rail
375µV Max VOS, 250pA IBIAS, 25pA IOS
Input and Output Op Amp
LT1521
300mA Low Dropout Regulator with Micropower
0.5V Dropout Voltage, 12µA Quiescent Current, Adjustable
Quiescent Current and Shutdown
Output 3V, 3.3V and 5V Fixed
LT1634
Micropower Precision Shunt Voltage Reference
1.25V, 2.5V, 4.096V, 5V Outputs, 10µA Operating Current,
0.05% Initial Accuracy 25ppm/°C Max Drift, SO-8, MSOP and
TO-92 Packages
C-Load is a trademark of Linear Technology Corporation.
RELATED PARTS
The rectified output is monitored by the LTC1540 com-
parator. The internal reference is used to set up a threshold
of about 18mV at the inverting input. A rising edge at the
comparator output triggers a one shot that temporarily
enables answer back and any other pulsed functions.
The total supply current is 400nA. Among other monolithic
one shots, the CD4047 draws the least amount of transient
current.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507 www.linear.com


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