LTC1540IS8#PBF Linear Technology, LTC1540IS8#PBF Datasheet - Page 12

• Manufacturer Part Number: LTC1540IS8#PBF
• Description: IC COMP NANOPOWER W/REF 8-SOIC
• Manufacturer: Linear Technology
• Type: with Voltage Referencer

Specifications of LTC1540IS8#PBF

• Number Of Elements: 1
• Output Type: CMOS, TTL
• Voltage - Supply: 2 V ~ 11 V, ±1 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Comparator Type: General Purpose
• No. Of Comparators: 1
• Response Time: 50µs
• Ic Output Type: CMOS, MOS, Open-Collector / Drain, TTL
• Supply Current: 300nA
• Supply Voltage Range: ± 1V To ± 5.5V
• Rohs Compliant: Yes
• Output Compatibility: CMOS, TTL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RELATED PARTS
PART NUMBER
LT
LT1351
LT1352/LT1353
LTC1440
LTC1443/LTC1444/LTC1445
LTC1474
LT1495
LT1521
LT1634
C-Load is a trademark of Linear Technology Corporation.
LTC1540
TYPICAL
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.
12
®
1178/LT1179
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
APPLICATION
●
FAX: [phone]
DESCRIPTION
Dual/Quad 17µA Precision Single Supply Op Amps
Single 250µA, 3MHz, 200V/µs Op Amp with Shutdown
Dual/Quad 250µA, 3MHz, 200V/µs Op Amps
Micropower Comparator with 1% Reference
Micropower Quad Comparators with 1% Reference
Low Quiescent Current High Efficiency
Step-Down Converter
1.5µA Max, Dual Precision Rail-to-Rail
Input and Output Op Amp
300mA Low Dropout Regulator with Micropower
Quiescent Current and Shutdown
Micropower Precision Shunt Voltage Reference
λ /4
0.23λ
U
FB
1N5712
●
www.linear.com
10k
Figure 10. Nanopower Field Detector
10nF
10nF
180k
12M
3
4
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.
+
–
LTC1540
5
2
2V TO 11V
6
1
COMMENTS
70µV Max V
C-Load
C-Load Op Amps Stable Driving Any Capacitive Load
1.182V ±1% Reference, ±10mV (Max) Input Offset
LTC1443 Has 1.182V Reference, LTC1444/LTC1445 Have
1.221V Reference and Adjustable Hysteresis
10µA Standby Current, 92% Efficiency, Space Saving 8-Pin
MSOP Package
375µV Max V
0.5V Dropout Voltage, 12µA Quiescent Current, Adjustable
Output 3V, 3.3V and 5V Fixed
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
7
8
TM
Op Amp Stable Driving Any Capacitive Load
ONE SHOT
OS
(CD4047)
OS
CMOS
, 5nA Max I
, 250pA I
1540 F10
Q
Q
BIAS
© LINEAR TECHNOLOGY CORPORATION 1997
BIAS
, 25pA I
LT/TP 0403 1K REV A • PRINTED IN USA
OS
sn1540 1540fas