LTC5536_15 Datasheet, PDF (1/12 Pages) Linear Technology – 600MHz to 7GHz Precision RF Detector with Fast Comparator Output

FEATURES
■ _{Temperature Compensated Internal Schottky}
Diode RF Detector
■ _{Wide Input Frequency Range: 600MHz to 7GHz*}
■ _{Wide Input Power Range: –26dBm to 12dBm}
■ _{Fast Comparator Output with Latch Enable}
■ _{25ns Response Time with 0dBm RF Input Level}
■ _{Rail-to-Rail Output Swing}
■ _{Comparator Output Current: ±20mA}
■ _{Wide VCC Range of 2.7V to 5.5V}
■ _{Low Operating Current: 2mA}
■ _{Available in a Low Profile (1mm) SOT-23 Package}
U
APPLICATIO S
■ _{RF Signal Presence Detectors for:}
802.11a, 802.11b, 802.11g, 802.15
Optical Data Links
Wireless Data Modems
Wireless and Cable Infrastructure
■ _{RF Power Alarm}
■ _{Envelope Detector}
■ _{RF ID Tag Reader}
TYPICAL APPLICATIO
600MHz to 7GHz RF Power Detector
RF
INPUT
33pF
1
LTC5536
RF_IN
V_CC
6
2
GND
5
V_OUT
100pF
V_CC
0.1µF
V_M ³
REFERENCE
V_M
LEN ⁴ DISABLE ENABLE
5536 TA01
LTC5536
600MHz to 7GHz
Precision RF Detector with
Fast Comparator Output
DESCRIPTIO
The LTC^®5536 is an RF power detector for RF applications
operating in the 600MHz to 7GHz range. A temperature
compensated Schottky diode peak detector and fast com-
parator are combined in a small ThinSOT^TM package. The
supply voltage range is optimized for operation from a
single cell lithium-ion or three cell NiMH battery.
The RF input voltage is peak detected using an on-chip
Schottky diode. The detected voltage is compared against
a reference voltage at V_M.
The response time from the RF input to V_OUT can be as little
as 20ns. The comparator output is latched when LEN is
high or is transparent when LEN is low.
The LTC5536 operates with RF input power levels from
–26dBm to 12dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*Operation at higher frequencies is possible with reduced performance.
V_M Comparator Switching Voltage
vs RF Input Power, 600MHz – 7GHz
3200
2800
2400
2000
1600
600MHz
1000MHz
2000MHz
3000MHz
4000MHz
5000MHz
6000MHz
7000MHz
V_CC = 3.6V
V_LEN = 0V
T_A = 25°C
1200
800
400
0
–28 –24 –20 –16 –12 –8 –4 0 4
INPUT RF POWER (dBm)
8 12
5536 TA01b
5536f
1