LTC5564 Datasheet, PDF (1/12 Pages) Linear Technology – UltraFast™ 7ns Response Time 15GHz RF Power Detector with Comparator

LTC5564
FEATURES
n _{Temperature Compensated Schottky RF Peak Detector}
n _{Wide Input Frequency Range: 600MHz to 15GHz}^†
n _{Wide Input Power Range: –24dBm to 16dBm}
n _{7ns Typical Response Time}
n _{75MHz Demodulation Bandwidth}
n _{Programmable Gain Settings for Improved Sensitivity}
n _{Adjustable Amplifier Output Offset Voltage}
n _{High Speed Comparator with Latch Enable: 9ns}
Typical Response Time
n _{16-Lead 3mm × 3mm QFN Package}
APPLICATIONS
n _{RF Signal Presence Detectors for: 802.11a, 802.11b,}
802.11g, 802.15, Optical Data Links, Wireless Data
Modems, Wireless and Cable Infrastructure
n _{5.8GHz ISM Band Radios}
n _{MMDS Microwave Links}
n _{PA Power Supply Envelope Tracking Control}
n _{Fast Alarm}
n _{RF Power Monitor}
n _{Envelope Detector}
n _{Ultra-Wideband Radio}
n _{Radar Detector}
UltraFast™ 7ns Response
Time 15GHz RF Power
Detector with Comparator
DESCRIPTION
The LTC^®5564 is a precision, RF power detector for ap-
plications in the 600MHz to 15GHz frequency range. The
LTC5564 operates with input power levels from –24dBm
to 16dBm.
A temperature compensated Schottky diode peak detector,
gain-selectable operational amplifier, and fast comparator
are combined in a small 16-lead 3mm × 3mm QFN package.
The RF input signal is peak detected and then sensed by
both a comparator and amplifier. The comparator provides
a 9ns response time to input levels exceeding V_REF along
with a latch enable/disable function. The gain selectable
operational amplifier provides a 350V/μs slew rate and
75MHz of demodulation bandwidth to the analog output.
V_OUTADJ and V_REF pins allow for the adjustment of V_OUT
offset and V_COMP switch point voltages, respectively.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
†_{Higher frequency operation is achievable with reduced performance. Consult the factory for}
more information.
SIMPLIFIED BLOCK DIAGRAM
V_CCRF
V_CCA
V_CCP
RFIN
V_OUTADJ
V_P
V_BIAS
+
– PROGRAMMABLE
FEEDBACK ARRAY
LEN
V_COMP
V_REF
V_OUT
PINS 3, 4,
EXPOSED PAD PIN 17
5564 BD
G1
G0
V_OUT vs Input Power 2.7GHz
3400
3200 ^VCC ^{= 5V}
3000 ^TA ^{= 25°C}
2800
2600
GAIN8
2400
2200
2000
GAIN4
1800
1600
1400
1200
1000
800
600
400
200
0
–24 –20 –16 –12 –8 –4 0
GAIN1
GAIN2
4 8 12 16
RFIN POWER (dBm)
5564 TA01b
5564f
1