LTC5564_15 Datasheet, PDF (1/16 Pages) Linear Technology – UltraFast 7ns Response Time 15GHz RF Power Detector with Comparator

LTC5564
FEATURES
nn _{Temperature Compensated Schottky RF Peak Detector}
nn _{Wide Input Frequency Range: 600MHz to 15GHz}^†
nn _{Wide Input Power Range: –24dBm to 16dBm}
nn _{7ns Typical Response Time}
nn _{75MHz Demodulation Bandwidth}
nn _{Programmable Gain Settings for Improved Sensitivity}
nn _{Adjustable Amplifier Output Offset Voltage}
nn _{High Speed Comparator with Latch Enable:}
9ns Typical Response Time
nn _{16-Lead 3mm × 3mm QFN Package}
nn _{Temperature Range: –40°C to 125°C}
APPLICATIONS
nn _{RF Signal Presence Detectors for: 802.11a, 802.11b,}
802.11g, 802.15, Optical Data Links, Wireless Data
Modems, Wireless and Cable Infrastructure
nn _{5.8GHz ISM Band Radios}
nn _{MMDS Microwave Links}
nn _{PA Power Supply Envelope Tracking Control}
nn _{Fast Alarm}
nn _{Envelope Detector}
nn _{Ultra-Wideband Radio}
nn _{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.
TYPICAL APPLICATION
Demo Board Schematic Optimized for 15GHz
V_CC
1000pF
10pF
V_REF
100pF
V_COMP
15GHz
RFIN
2.2pF
17 16 15 14 13
NC V_CCRF V_REF V_COMP ^VCC
1
RFIN
12
V_CCA
0.5pF
2
NC
3 _GND
LTC5564
V_CCP ¹¹
V_OUT ¹⁰
10pF
68Ω
4
GND
NC ^{9 100pF}
LEN V_OUTADJ G0 G1
LEN
V_OUTADJ
56
7
8
G1
G0
10k
10k 10k
5564 F05
1000pF
V_OUT
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
For more information www.linear.com/LTC5564
5564fc
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