LT5504 Просмотр технического описания (PDF) - Linear Technology
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LT5504 Datasheet PDF : 8 Pages
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FEATURES
■ RF Frequency Range: 800MHz to 2.7GHz
■ Ultra Wide Dynamic Range: 75dB at 900MHz
■ Wide Power Supply Range: 2.7V to 5.25V
■ Low Supply Current: 14.7mA at 3V
■ 8-Lead MS0P Package
U
APPLICATIO S
■ RSSI Measurements
■ Receive AGC
■ Transmit Power Control
■ ASK and Envelope Demodulation
■ 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 –75dBm 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
82Ω
RF –
ENABLE
EN
3V
VCC
VOUT R2
200Ω
IF
DETECTOR
•••
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
–2
0.4
–4
0
–6
–80 –70 –60 –50 –40 –30 –20 –10 0 10
PIN (dBm)
5504 TA01b
5504f
1
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