LTC5531_15 Datasheet, PDF (1/12 Pages) Linear Technology – Precision 300MHz to 7GHz RF Detector with Shutdown and Offset Adjustment

LTC5531
Precision 300MHz to 7GHz
RF Detector with Shutdown
and Offset Adjustment
FEATURES
s _{Temperature Compensated Internal Schottky}
Diode RF Detector
s _{Wide Input Frequency Range: 300MHz to 7GHz*}
s _{Wide Input Power Range: –32dBm to 10dBm}
s _{Buffered Detector Output}
s _{Precision VOUT Offset Control}
s _{Wide VCC Range of 2.7V to 6V}
s _{Low Operating Current: 500µA}
s _{Low Shutdown Current: <2µA}
s _{Available in a Low Profile (1mm) SOT-23 Package}
U
APPLICATIO S
s _{802.11a, 802.11b, 802.11g, 802.15, 802.16}
s _{Multimode Mobile Phone Products}
s _{Optical Data Links}
s _{Wireless Data Modems}
s _{Wireless and Cable Infrastructure}
s _{RF Power Alarm}
s _{Envelope Detector}
DESCRIPTIO
The LTC^®5531 is an RF power detector for RF applications
operating in the 300MHz to 7GHz range. A temperature
compensated Schottky diode peak detector and buffer
amplifier are combined in a small ThinSOT^TM package. The
supply voltage range is optimized for operation from a
single lithium-ion cell or 3xNiMH.
The RF input voltage is peak detected using an on-chip
Schottky diode. The detected voltage is buffered and
supplied to the V_OUT pin. A power saving shutdown mode
reduces current to less than 2µA. The initial offset voltage
of 120mV ±35mV can be precisely adjusted using the
V_OS pin.
The LTC5531 operates with input power levels from
–32dBm to 10dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*Higher frequency operation is achievable with reduced performance. Consult factory for more
information.
TYPICAL APPLICATIO
300MHz to 7GHz RF Power Detector
RF
INPUT
33pF
1
LTC5531
RF_IN
V_CC
6
2
GND
5
V_OUT
100pF
3
DISABLE ENABLE SHDN
V_OS
4
V_OS
REFERENCE
5531 TA01
V_CC
0.1µF
V_OUT Output Voltage vs RF Input Power
3600
V_OS = 0V
3200 ^VCC ^{= 3.6V}
T_A = 25°C
2800
2400
2000
2000MHz
1000MHz
4000MHz
3000MHz
1600
1200
300MHz
800
5000MHz
6000MHz
400
7000MHz
0
–30 –26 –22 –18 –14 –10 –6 –2 2
RF INPUT POWER (dBm)
6 10
5531 TA02
5531f
1