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LT5504_15 Datasheet, PDF (1/8 Pages) Linear Technology – 800MHz to 2.7GHz RF Measuring Receiver | |||
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FEATURES
â RF Frequency Range: 800MHz to 2.7GHz
â Ultra Wide Dynamic Range: 75dB at 900MHz
â Wide Power Supply Range: 2.7V to 5.25V
â Low Supply Current: 14.7mA at 3V
â 8-Lead MS0P Package
U
APPLICATIO S
â RSSI Measurements
â Receive AGC
â Transmit Power Control
â ASK and Envelope Demodulation
â GSM/TDMA/CDMA/WCDMA
TYPICAL APPLICATIO
LT5504
800MHz to 2.7GHz
RF Measuring Receiver
DESCRIPTIO
The LT®5504 is an 800MHz to 2700MHz monolithic inte-
grated measuring receiver, capable of detecting a wide
dynamic range RF signal from â75dBm to +5dBm. The
logarithm of the RF signal is precisely converted into a
linear DC voltage. The LT5504 consists of RF/IF limiters,
an LO buffer amplifier, a limiting mixer, a 3rd-order
450MHz integrated low pass filter, RF/IF detectors and an
output interface. The ultrawide dynamic range is achieved
by simultaneously measuring the RF signal and a down-
converted IF signal obtained using the on-chip mixer and
an external local oscillator. The RF- and IF-detected sig-
nals are summed to generate an accurate linear DC voltage
proportional to the input RF voltage (or power) in dB. The
output is buffered with a low output impedance driver.
, LTC and LT are registered trademarks of Linear Technology Corporation.
C2
C1
1nF
100pF
LT5504
RF
INPUT
RF
RF+ DETECTOR
R1
82â¦
RF â
ENABLE
EN
3V
VCC
VOUT R2
200â¦
IF
DETECTOR
â¢â¢â¢
IF
DETECTOR
C3
10pF
OUTPUT
GND
LO
5504 TA01a
LO
INPUT
Output Voltage and Slope
Variation vs RF Input Power
2.4
6
fRF = 900MHz
fIF = 240MHz
2.0 AVERAGE SLOPE:23mV/dB
4
1.6
2
1.2
0
0.8
â2
0.4
â4
0
â6
â80 â70 â60 â50 â40 â30 â20 â10 0 10
PIN (dBm)
5504 TA01b
5504f
1
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